Refactor memory measurement

Move out all the memory measurement to a separate class that can cache
all of its data through orientation changes.

Tweak the display to make it draw large squares for the legend instead
of a 1x1 square. Add padding to the percentage bar chart.

Change-Id: I4cd5bc4ba31a422a55740e8f58e5e571cf9866a5

res/layout/preference_memoryusage.xml

@@ -22,5 +22,7 @@
         android:gravity="center_vertical"
         android:id="@+id/percentage_bar_chart"
         android:paddingRight="?android:attr/scrollbarSize"
-        android:textAppearance="?android:attr/textAppearanceMedium">
+        android:paddingTop="6dip"
+        android:paddingBottom="6dip"
+        emptyColor="@color/memory_avail">
 </com.android.settings.deviceinfo.PercentageBarChart>

res/values/attrs.xml

@@ -42,4 +42,9 @@
         <!-- Radius of the shadow. -->
         <attr name="android:shadowRadius" />
     </declare-styleable>
+
+    <declare-styleable name="PercentageBarChart">
+        <!-- Background color -->
+        <attr name="emptyColor" format="color" />
+    </declare-styleable>
 </resources>

res/xml/device_info_memory.xml

@@ -37,22 +37,19 @@
 
     <PreferenceCategory android:title="@string/internal_memory">
         <com.android.settings.deviceinfo.UsageBarPreference
-            android:key="memory_internal_chart" />
+            android:key="memory_internal_chart"/>
         <Preference android:key="memory_internal_size"
             android:title="@string/memory_size"
-            android:summary="00"/>
+            android:summary="@string/memory_calculating_size"/>
         <Preference android:key="memory_internal_media"
-            android:icon="@color/memory_media_usage"
             android:title="@string/memory_media_usage"
             android:summary="@string/memory_calculating_size"/>
         <Preference android:key="memory_internal_apps"
-            android:icon="@color/memory_apps_usage"
             android:title="@string/memory_apps_usage"
             android:summary="@string/memory_calculating_size"/>
         <Preference android:key="memory_internal_avail"
-            android:icon="@color/memory_avail"
             android:title="@string/memory_available"
-            android:summary="00"/>
+            android:summary="@string/memory_calculating_size"/>
     </PreferenceCategory>
 
 </PreferenceScreen>

src/com/android/settings/deviceinfo/Memory.java

@@ -16,38 +16,32 @@
 
 package com.android.settings.deviceinfo;
 
-import com.android.internal.app.IMediaContainerService;
 import com.android.settings.R;
 import com.android.settings.SettingsPreferenceFragment;
+import com.android.settings.deviceinfo.MemoryMeasurement.MeasurementReceiver;
 
-import android.app.Activity;
 import android.app.ActivityManager;
 import android.app.AlertDialog;
 import android.app.Dialog;
 import android.content.BroadcastReceiver;
-import android.content.ComponentName;
 import android.content.Context;
 import android.content.DialogInterface;
 import android.content.Intent;
 import android.content.IntentFilter;
-import android.content.ServiceConnection;
 import android.content.DialogInterface.OnCancelListener;
 import android.content.pm.ApplicationInfo;
-import android.content.pm.IPackageStatsObserver;
-import android.content.pm.PackageManager;
-import android.content.pm.PackageStats;
 import android.content.res.Resources;
+import android.graphics.drawable.ShapeDrawable;
+import android.graphics.drawable.shapes.RectShape;
+import android.graphics.drawable.shapes.RoundRectShape;
 import android.hardware.UsbManager;
 import android.os.Bundle;
 import android.os.Environment;
 import android.os.Handler;
-import android.os.HandlerThread;
 import android.os.IBinder;
-import android.os.Looper;
 import android.os.Message;
 import android.os.RemoteException;
 import android.os.ServiceManager;
-import android.os.StatFs;
 import android.os.storage.IMountService;
 import android.os.storage.StorageEventListener;
 import android.os.storage.StorageManager;
@@ -58,11 +52,10 @@ import android.text.format.Formatter;
 import android.util.Log;
 import android.widget.Toast;
 
-import java.io.File;
-import java.util.ArrayList;
 import java.util.List;
 
-public class Memory extends SettingsPreferenceFragment implements OnCancelListener {
+public class Memory extends SettingsPreferenceFragment implements OnCancelListener,
+        MeasurementReceiver {
     private static final String TAG = "Memory";
     private static final boolean localLOGV = false;
 
@@ -110,13 +103,6 @@ public class Memory extends SettingsPreferenceFragment implements OnCancelListen
     private int mInternalAppsColor;
     private int mInternalUsedColor;
 
-    // Internal memory fields
-    private long mInternalTotalSize;
-    private long mInternalUsedSize;
-    private long mInternalMediaSize;
-    private long mInternalAppsSize;
-    private boolean mMeasured = false;
-
     boolean mSdMountToggleAdded = true;
     
     // Access using getMountService()
@@ -125,241 +111,46 @@ public class Memory extends SettingsPreferenceFragment implements OnCancelListen
     private StorageManager mStorageManager = null;
 
     // Updates the memory usage bar graph.
-    private static final int MSG_UI_UPDATE_APPROXIMATE = 1;
+    private static final int MSG_UI_UPDATE_INTERNAL_APPROXIMATE = 1;
 
     // Updates the memory usage bar graph.
-    private static final int MSG_UI_UPDATE_EXACT = 2;
+    private static final int MSG_UI_UPDATE_INTERNAL_EXACT = 2;
+
+    // Updates the memory usage stats for external.
+    private static final int MSG_UI_UPDATE_EXTERNAL_APPROXIMATE = 3;
 
     private Handler mUpdateHandler = new Handler() {
         @Override
         public void handleMessage(Message msg) {
             switch (msg.what) {
-                case MSG_UI_UPDATE_APPROXIMATE:
+                case MSG_UI_UPDATE_INTERNAL_APPROXIMATE: {
-                    updateUiApproximate();
+                    Bundle bundle = msg.getData();
-                    break;
+                    final long totalSize = bundle.getLong(MemoryMeasurement.TOTAL_SIZE);
-                case MSG_UI_UPDATE_EXACT:
+                    final long availSize = bundle.getLong(MemoryMeasurement.AVAIL_SIZE);
-                    updateUiExact();
+                    updateUiApproximate(totalSize, availSize);
-                    mMeasured = true;
                     break;
                 }
-        }
+                case MSG_UI_UPDATE_INTERNAL_EXACT: {
-    };
+                    Bundle bundle = msg.getData();
-
+                    final long totalSize = bundle.getLong(MemoryMeasurement.TOTAL_SIZE);
-    private static final String DEFAULT_CONTAINER_PACKAGE = "com.android.defcontainer";
+                    final long availSize = bundle.getLong(MemoryMeasurement.AVAIL_SIZE);
-
+                    final long mediaUsed = bundle.getLong(MemoryMeasurement.MEDIA_USED);
-    private static final ComponentName DEFAULT_CONTAINER_COMPONENT = new ComponentName(
+                    final long appsUsed = bundle.getLong(MemoryMeasurement.APPS_USED);
-            DEFAULT_CONTAINER_PACKAGE, "com.android.defcontainer.DefaultContainerService");
+                    updateUiExact(totalSize, availSize, mediaUsed, appsUsed);
-
-    class MemoryMeasurementHandler extends Handler {
-        public static final int MSG_MEASURE_ALL = 1;
-
-        public static final int MSG_CONNECTED = 2;
-
-        public static final int MSG_DISCONNECTED = 3;
-
-        private List<String> mPendingApps = new ArrayList<String>();
-
-        private volatile boolean mBound = false;
-
-        private long mAppsSize = 0;
-
-        final private ServiceConnection mDefContainerConn = new ServiceConnection() {
-            public void onServiceConnected(ComponentName name, IBinder service) {
-                mBound = true;
-                IMediaContainerService imcs = IMediaContainerService.Stub.asInterface(service);
-                mMeasurementHandler.sendMessage(mMeasurementHandler.obtainMessage(
-                        MemoryMeasurementHandler.MSG_CONNECTED, imcs));
-            }
-
-            public void onServiceDisconnected(ComponentName name) {
-                mBound = false;
-            }
-        };
-
-        MemoryMeasurementHandler(Looper looper) {
-            super(looper);
-        }
-
-        @Override
-        public void handleMessage(Message msg) {
-            switch (msg.what) {
-                case MSG_MEASURE_ALL: {
-                    updateExternalStorage();
-                    updateApproximateInternalStorage();
-
-                    Intent service = new Intent().setComponent(DEFAULT_CONTAINER_COMPONENT);
-                    getActivity().bindService(service, mDefContainerConn, Context.BIND_AUTO_CREATE);
-
-                    mUpdateHandler.sendEmptyMessage(MSG_UI_UPDATE_APPROXIMATE);
                     break;
                 }
-                case MSG_CONNECTED: {
+                case MSG_UI_UPDATE_EXTERNAL_APPROXIMATE: {
-                    IMediaContainerService imcs = (IMediaContainerService) msg.obj;
+                    Bundle bundle = msg.getData();
-                    updateExactInternalStorage(imcs);
+                    final long totalSize = bundle.getLong(MemoryMeasurement.TOTAL_SIZE);
-                }
+                    final long availSize = bundle.getLong(MemoryMeasurement.AVAIL_SIZE);
-            }
+                    updateExternalStorage(totalSize, availSize);
-        }
+                    break;
-
-        public void cleanUp() {
-            if (mBound) {
-                getActivity().unbindService(mDefContainerConn);
-            }
-        }
-
-        public void queuePackageMeasurementLocked(String packageName) {
-            mPendingApps.add(packageName);
-        }
-
-        public void requestQueuedMeasurementsLocked() {
-            final Activity activity = getActivity();
-            if (activity == null) {
-                return;
-            }
-
-            final PackageManager pm = activity.getPackageManager();
-            if (pm == null) {
-                return;
-            }
-
-            final int N = mPendingApps.size();
-            for (int i = 0; i < N; i++) {
-                pm.getPackageSizeInfo(mPendingApps.get(i), mStatsObserver);
-            }
-        }
-
-        final IPackageStatsObserver.Stub mStatsObserver = new IPackageStatsObserver.Stub() {
-            public void onGetStatsCompleted(PackageStats stats, boolean succeeded) {
-                if (succeeded) {
-                    mAppsSize += stats.codeSize + stats.dataSize;
-                }
-
-                synchronized (mPendingApps) {
-                    mPendingApps.remove(stats.packageName);
-
-                    if (mPendingApps.size() == 0) {
-                        mInternalAppsSize = mAppsSize;
-
-                        mUpdateHandler.sendEmptyMessage(MSG_UI_UPDATE_EXACT);
                 }
             }
         }
     };
 
-        private void updateApproximateInternalStorage() {
+    private MemoryMeasurement mMeasurement;
-            final File dataPath = Environment.getDataDirectory();
-            final StatFs stat = new StatFs(dataPath.getPath());
-            final long blockSize = stat.getBlockSize();
-            final long totalBlocks = stat.getBlockCount();
-            final long availableBlocks = stat.getAvailableBlocks();
-
-            final long totalSize = totalBlocks * blockSize;
-            final long availSize = availableBlocks * blockSize;
-            mInternalSize.setSummary(formatSize(totalSize));
-            mInternalAvail.setSummary(formatSize(availSize));
-
-            mInternalTotalSize = totalSize;
-            mInternalUsedSize = totalSize - availSize;
-        }
-
-        private void updateExactInternalStorage(IMediaContainerService imcs) {
-            long mediaSize;
-            try {
-                // TODO get these directories from somewhere
-                mediaSize = imcs.calculateDirectorySize("/data/media");
-            } catch (Exception e) {
-                Log.i(TAG, "Could not read memory from default container service");
-                return;
-            }
-
-            mInternalMediaSize = mediaSize;
-
-            // We have to get installd to measure the package sizes.
-            PackageManager pm = getPackageManager();
-            List<ApplicationInfo> apps = pm
-                    .getInstalledApplications(PackageManager.GET_UNINSTALLED_PACKAGES
-                            | PackageManager.GET_DISABLED_COMPONENTS);
-            if (apps != null) {
-                synchronized (mPendingApps) {
-                    for (int i = 0; i < apps.size(); i++) {
-                        final ApplicationInfo info = apps.get(i);
-                        queuePackageMeasurementLocked(info.packageName);
-                    }
-
-                    requestQueuedMeasurementsLocked();
-                }
-            }
-        }
-
-        private void updateExternalStorage() {
-            if (Environment.isExternalStorageEmulated()) {
-                return;
-            }
-
-            String status = Environment.getExternalStorageState();
-            String readOnly = "";
-            if (status.equals(Environment.MEDIA_MOUNTED_READ_ONLY)) {
-                status = Environment.MEDIA_MOUNTED;
-                readOnly = mRes.getString(R.string.read_only);
-            }
-
-            if (status.equals(Environment.MEDIA_MOUNTED)) {
-                if (!Environment.isExternalStorageRemovable()) {
-                    // This device has built-in storage that is not removable.
-                    // There is no reason for the user to unmount it.
-                    if (mSdMountToggleAdded) {
-                        mSdMountPreferenceGroup.removePreference(mSdMountToggle);
-                        mSdMountToggleAdded = false;
-                    }
-                }
-                try {
-                    File path = Environment.getExternalStorageDirectory();
-                    StatFs stat = new StatFs(path.getPath());
-                    long blockSize = stat.getBlockSize();
-                    long totalBlocks = stat.getBlockCount();
-                    long availableBlocks = stat.getAvailableBlocks();
-
-                    mSdSize.setSummary(formatSize(totalBlocks * blockSize));
-                    mSdAvail.setSummary(formatSize(availableBlocks * blockSize) + readOnly);
-
-                    mSdMountToggle.setEnabled(true);
-                    mSdMountToggle.setTitle(mRes.getString(R.string.sd_eject));
-                    mSdMountToggle.setSummary(mRes.getString(R.string.sd_eject_summary));
-
-                } catch (IllegalArgumentException e) {
-                    // this can occur if the SD card is removed, but we haven't
-                    // received the
-                    // ACTION_MEDIA_REMOVED Intent yet.
-                    status = Environment.MEDIA_REMOVED;
-                }
-            } else {
-                mSdSize.setSummary(mRes.getString(R.string.sd_unavailable));
-                mSdAvail.setSummary(mRes.getString(R.string.sd_unavailable));
-
-                if (!Environment.isExternalStorageRemovable()) {
-                    if (status.equals(Environment.MEDIA_UNMOUNTED)) {
-                        if (!mSdMountToggleAdded) {
-                            mSdMountPreferenceGroup.addPreference(mSdMountToggle);
-                            mSdMountToggleAdded = true;
-                        }
-                    }
-                }
-
-                if (status.equals(Environment.MEDIA_UNMOUNTED) ||
-                    status.equals(Environment.MEDIA_NOFS) ||
-                    status.equals(Environment.MEDIA_UNMOUNTABLE) ) {
-                    mSdMountToggle.setEnabled(true);
-                    mSdMountToggle.setTitle(mRes.getString(R.string.sd_mount));
-                    mSdMountToggle.setSummary(mRes.getString(R.string.sd_mount_summary));
-                } else {
-                    mSdMountToggle.setEnabled(false);
-                    mSdMountToggle.setTitle(mRes.getString(R.string.sd_mount));
-                    mSdMountToggle.setSummary(mRes.getString(R.string.sd_insert_summary));
-                }
-            }
-        }
-    }
-
-    private MemoryMeasurementHandler mMeasurementHandler;
 
     @Override
     public void onCreate(Bundle icicle) {
@@ -394,12 +185,27 @@ public class Memory extends SettingsPreferenceFragment implements OnCancelListen
         mInternalAppsColor = mRes.getColor(R.color.memory_apps_usage);
         mInternalUsedColor = mRes.getColor(R.color.memory_used);
 
+        float[] radius = new float[] {
+                5f, 5f, 5f, 5f, 5f, 5f, 5f, 5f
+        };
+        RoundRectShape shape1 = new RoundRectShape(radius, null, null);
+
+        ShapeDrawable mediaShape = new ShapeDrawable(shape1);
+        mediaShape.setIntrinsicWidth(32);
+        mediaShape.setIntrinsicHeight(32);
+        mediaShape.getPaint().setColor(mInternalMediaColor);
+        mInternalMediaUsage.setIcon(mediaShape);
+
+        ShapeDrawable appsShape = new ShapeDrawable(shape1);
+        appsShape.setIntrinsicWidth(32);
+        appsShape.setIntrinsicHeight(32);
+        appsShape.getPaint().setColor(mInternalAppsColor);
+        mInternalAppsUsage.setIcon(appsShape);
+
         mInternalUsageChart = (UsageBarPreference) findPreference(MEMORY_INTERNAL_CHART);
 
-        // Start the thread that will measure the disk usage.
+        mMeasurement = MemoryMeasurement.getInstance(getActivity());
-        final HandlerThread t = new HandlerThread("MeasurementHandler");
+        mMeasurement.setReceiver(this);
-        t.start();
-        mMeasurementHandler = new MemoryMeasurementHandler(t.getLooper());
     }
 
     @Override
@@ -411,9 +217,10 @@ public class Memory extends SettingsPreferenceFragment implements OnCancelListen
         intentFilter.addDataScheme("file");
         getActivity().registerReceiver(mReceiver, intentFilter);
 
-        if (!mMeasured) {
+        if (!Environment.isExternalStorageEmulated()) {
-            mMeasurementHandler.sendEmptyMessage(MemoryMeasurementHandler.MSG_MEASURE_ALL);
+            mMeasurement.measureExternal();
         }
+        mMeasurement.measureInternal();
     }
 
     StorageEventListener mStorageListener = new StorageEventListener() {
@@ -422,7 +229,9 @@ public class Memory extends SettingsPreferenceFragment implements OnCancelListen
             Log.i(TAG, "Received storage state changed notification that " +
                     path + " changed state from " + oldState +
                     " to " + newState);
-            mMeasurementHandler.sendEmptyMessage(MemoryMeasurementHandler.MSG_MEASURE_ALL);
+            if (!Environment.isExternalStorageEmulated()) {
+                mMeasurement.measureExternal();
+            }
         }
     };
 
@@ -430,7 +239,7 @@ public class Memory extends SettingsPreferenceFragment implements OnCancelListen
     public void onPause() {
         super.onPause();
         getActivity().unregisterReceiver(mReceiver);
-        mMeasurementHandler.removeMessages(MemoryMeasurementHandler.MSG_MEASURE_ALL);
+        mMeasurement.cleanUp();
     }
 
     @Override
@@ -438,7 +247,6 @@ public class Memory extends SettingsPreferenceFragment implements OnCancelListen
         if (mStorageManager != null && mStorageListener != null) {
             mStorageManager.unregisterListener(mStorageListener);
         }
-        mMeasurementHandler.cleanUp();
         super.onDestroy();
     }
 
@@ -477,7 +285,12 @@ public class Memory extends SettingsPreferenceFragment implements OnCancelListen
     private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
         @Override
         public void onReceive(Context context, Intent intent) {
-            mMeasurementHandler.sendEmptyMessage(MemoryMeasurementHandler.MSG_MEASURE_ALL);
+            mMeasurement.invalidate();
+
+            if (!Environment.isExternalStorageEmulated()) {
+                mMeasurement.measureExternal();
+            }
+            mMeasurement.measureInternal();
         }
     };
 
@@ -572,35 +385,95 @@ public class Memory extends SettingsPreferenceFragment implements OnCancelListen
         }
     }
 
-    private void updateUiExact() {
+    private void updateUiExact(long totalSize, long availSize, long mediaSize, long appsSize) {
-        final float totalSize = mInternalTotalSize;
+        mInternalSize.setSummary(formatSize(totalSize));
-
+        mInternalAvail.setSummary(formatSize(availSize));
-        final long mediaSize = mInternalMediaSize;
+        mInternalMediaUsage.setSummary(formatSize(mediaSize));
-        final long appsSize = mInternalAppsSize;
+        mInternalAppsUsage.setSummary(formatSize(appsSize));
 
         mInternalUsageChart.clear();
-        mInternalUsageChart.addEntry(mediaSize / totalSize, mInternalMediaColor);
+        mInternalUsageChart.addEntry(mediaSize / (float) totalSize, mInternalMediaColor);
-        mInternalUsageChart.addEntry(appsSize / totalSize, mInternalAppsColor);
+        mInternalUsageChart.addEntry(appsSize / (float) totalSize, mInternalAppsColor);
+
+        final long usedSize = totalSize - availSize;
 
         // There are other things that can take up storage, but we didn't
         // measure it.
-        final long remaining = mInternalUsedSize - (mediaSize + appsSize);
+        final long remaining = usedSize - (mediaSize + appsSize);
         if (remaining > 0) {
-            mInternalUsageChart.addEntry(remaining / totalSize, mInternalUsedColor);
+            mInternalUsageChart.addEntry(remaining / (float) totalSize, mInternalUsedColor);
         }
         mInternalUsageChart.commit();
-
-        mInternalMediaUsage.setSummary(formatSize(mediaSize));
-        mInternalAppsUsage.setSummary(formatSize(appsSize));
     }
 
-    private void updateUiApproximate() {
+    private void updateUiApproximate(long totalSize, long availSize) {
+        mInternalSize.setSummary(formatSize(totalSize));
+        mInternalAvail.setSummary(formatSize(availSize));
+
+        final long usedSize = totalSize - availSize;
+
         mInternalUsageChart.clear();
-        mInternalUsageChart.addEntry(mInternalUsedSize / (float) mInternalTotalSize, getResources()
+        mInternalUsageChart.addEntry(usedSize / (float) totalSize, mInternalUsedColor);
-                .getColor(R.color.memory_used));
         mInternalUsageChart.commit();
     }
 
+    private void updateExternalStorage(long totalSize, long availSize) {
+        String status = Environment.getExternalStorageState();
+        String readOnly = "";
+        if (status.equals(Environment.MEDIA_MOUNTED_READ_ONLY)) {
+            status = Environment.MEDIA_MOUNTED;
+            readOnly = mRes.getString(R.string.read_only);
+        }
+
+        if (status.equals(Environment.MEDIA_MOUNTED)) {
+            if (!Environment.isExternalStorageRemovable()) {
+                // This device has built-in storage that is not removable.
+                // There is no reason for the user to unmount it.
+                if (mSdMountToggleAdded) {
+                    mSdMountPreferenceGroup.removePreference(mSdMountToggle);
+                    mSdMountToggleAdded = false;
+                }
+            }
+            try {
+                mSdSize.setSummary(formatSize(totalSize));
+                mSdAvail.setSummary(formatSize(availSize) + readOnly);
+
+                mSdMountToggle.setEnabled(true);
+                mSdMountToggle.setTitle(mRes.getString(R.string.sd_eject));
+                mSdMountToggle.setSummary(mRes.getString(R.string.sd_eject_summary));
+
+            } catch (IllegalArgumentException e) {
+                // this can occur if the SD card is removed, but we haven't
+                // received the
+                // ACTION_MEDIA_REMOVED Intent yet.
+                status = Environment.MEDIA_REMOVED;
+            }
+        } else {
+            mSdSize.setSummary(mRes.getString(R.string.sd_unavailable));
+            mSdAvail.setSummary(mRes.getString(R.string.sd_unavailable));
+
+            if (!Environment.isExternalStorageRemovable()) {
+                if (status.equals(Environment.MEDIA_UNMOUNTED)) {
+                    if (!mSdMountToggleAdded) {
+                        mSdMountPreferenceGroup.addPreference(mSdMountToggle);
+                        mSdMountToggleAdded = true;
+                    }
+                }
+            }
+
+            if (status.equals(Environment.MEDIA_UNMOUNTED) || status.equals(Environment.MEDIA_NOFS)
+                    || status.equals(Environment.MEDIA_UNMOUNTABLE)) {
+                mSdMountToggle.setEnabled(true);
+                mSdMountToggle.setTitle(mRes.getString(R.string.sd_mount));
+                mSdMountToggle.setSummary(mRes.getString(R.string.sd_mount_summary));
+            } else {
+                mSdMountToggle.setEnabled(false);
+                mSdMountToggle.setTitle(mRes.getString(R.string.sd_mount));
+                mSdMountToggle.setSummary(mRes.getString(R.string.sd_insert_summary));
+            }
+        }
+    }
+
     private String formatSize(long size) {
         return Formatter.formatFileSize(getActivity(), size);
     }
@@ -609,4 +482,25 @@ public class Memory extends SettingsPreferenceFragment implements OnCancelListen
         // TODO: Is this really required?
         // finish();
     }
+
+    @Override
+    public void updateApproximateExternal(Bundle bundle) {
+        final Message message = mUpdateHandler.obtainMessage(MSG_UI_UPDATE_EXTERNAL_APPROXIMATE);
+        message.setData(bundle);
+        mUpdateHandler.sendMessage(message);
+    }
+
+    @Override
+    public void updateApproximateInternal(Bundle bundle) {
+        final Message message = mUpdateHandler.obtainMessage(MSG_UI_UPDATE_INTERNAL_APPROXIMATE);
+        message.setData(bundle);
+        mUpdateHandler.sendMessage(message);
+    }
+
+    @Override
+    public void updateExactInternal(Bundle bundle) {
+        final Message message = mUpdateHandler.obtainMessage(MSG_UI_UPDATE_INTERNAL_EXACT);
+        message.setData(bundle);
+        mUpdateHandler.sendMessage(message);
+    }
 }

src/com/android/settings/deviceinfo/MemoryMeasurement.java

@@ -0,0 +1,403 @@
+package com.android.settings.deviceinfo;
+
+import com.android.internal.app.IMediaContainerService;
+
+import android.content.ComponentName;
+import android.content.Context;
+import android.content.Intent;
+import android.content.ServiceConnection;
+import android.content.pm.ApplicationInfo;
+import android.content.pm.IPackageStatsObserver;
+import android.content.pm.PackageManager;
+import android.content.pm.PackageStats;
+import android.os.Bundle;
+import android.os.Environment;
+import android.os.Handler;
+import android.os.HandlerThread;
+import android.os.IBinder;
+import android.os.Looper;
+import android.os.Message;
+import android.os.StatFs;
+import android.util.Log;
+
+import java.io.File;
+import java.lang.ref.WeakReference;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Measure the memory for various systems.
+ *
+ * TODO: This class should ideally have less knowledge about what the context
+ * it's measuring is. In the future, reduce the amount of stuff it needs to
+ * know about by just keeping an array of measurement types of the following
+ * properties:
+ *
+ *   Filesystem stats (using StatFs)
+ *   Directory measurements (using DefaultContainerService.measureDir)
+ *   Applicaiton measurements (using PackageManager)
+ *
+ * Then the calling application would just specify the type and an argument.
+ * This class would keep track of it while the calling application would
+ * decide on how to use it.
+ */
+public class MemoryMeasurement {
+    private static final String TAG = "MemoryMeasurement";
+
+    public static final String TOTAL_SIZE = "total_size";
+
+    public static final String AVAIL_SIZE = "avail_size";
+
+    public static final String APPS_USED = "apps_used";
+
+    public static final String MEDIA_USED = "media_used";
+
+    private static final String DEFAULT_CONTAINER_PACKAGE = "com.android.defcontainer";
+
+    private static final ComponentName DEFAULT_CONTAINER_COMPONENT = new ComponentName(
+            DEFAULT_CONTAINER_PACKAGE, "com.android.defcontainer.DefaultContainerService");
+
+    private final MeasurementHandler mHandler;
+
+    private static volatile MemoryMeasurement sInstance;
+
+    private volatile WeakReference<MeasurementReceiver> mReceiver;
+
+    // Internal memory fields
+    private long mInternalTotalSize;
+    private long mInternalAvailSize;
+    private long mInternalMediaSize;
+    private long mInternalAppsSize;
+
+    // External memory fields
+    private long mExternalTotalSize;
+
+    private long mExternalAvailSize;
+
+    private MemoryMeasurement(Context context) {
+        // Start the thread that will measure the disk usage.
+        final HandlerThread t = new HandlerThread("MemoryMeasurement");
+        t.start();
+        mHandler = new MeasurementHandler(context, t.getLooper());
+    }
+
+    /**
+     * Get the singleton of the MemoryMeasurement class. The application
+     * context is used to avoid leaking activities.
+     */
+    public static MemoryMeasurement getInstance(Context context) {
+        if (sInstance == null) {
+            synchronized (MemoryMeasurement.class) {
+                if (sInstance == null) {
+                    sInstance = new MemoryMeasurement(context.getApplicationContext());
+                }
+            }
+        }
+
+        return sInstance;
+    }
+
+    public void setReceiver(MeasurementReceiver receiver) {
+        mReceiver = new WeakReference<MeasurementReceiver>(receiver);
+    }
+
+    public void measureExternal() {
+        if (!mHandler.hasMessages(MeasurementHandler.MSG_MEASURE_EXTERNAL)) {
+            mHandler.sendEmptyMessage(MeasurementHandler.MSG_MEASURE_EXTERNAL);
+        }
+    }
+
+    public void measureInternal() {
+        if (!mHandler.hasMessages(MeasurementHandler.MSG_MEASURE_INTERNAL)) {
+            mHandler.sendEmptyMessage(MeasurementHandler.MSG_MEASURE_INTERNAL);
+        }
+    }
+
+    public void cleanUp() {
+        mReceiver = null;
+        mHandler.cleanUp();
+    }
+
+    private void sendInternalApproximateUpdate() {
+        MeasurementReceiver receiver = (mReceiver != null) ? mReceiver.get() : null;
+        if (receiver == null) {
+            return;
+        }
+
+        Bundle bundle = new Bundle();
+        bundle.putLong(TOTAL_SIZE, mInternalTotalSize);
+        bundle.putLong(AVAIL_SIZE, mInternalAvailSize);
+
+        receiver.updateApproximateInternal(bundle);
+    }
+
+    private void sendInternalExactUpdate() {
+        MeasurementReceiver receiver = (mReceiver != null) ? mReceiver.get() : null;
+        if (receiver == null) {
+            return;
+        }
+
+        Bundle bundle = new Bundle();
+        bundle.putLong(TOTAL_SIZE, mInternalTotalSize);
+        bundle.putLong(AVAIL_SIZE, mInternalAvailSize);
+        bundle.putLong(APPS_USED, mInternalAppsSize);
+        bundle.putLong(MEDIA_USED, mInternalMediaSize);
+
+        receiver.updateExactInternal(bundle);
+    }
+
+    private void sendExternalApproximateUpdate() {
+        MeasurementReceiver receiver = (mReceiver != null) ? mReceiver.get() : null;
+        if (receiver == null) {
+            return;
+        }
+
+        Bundle bundle = new Bundle();
+        bundle.putLong(TOTAL_SIZE, mExternalTotalSize);
+        bundle.putLong(AVAIL_SIZE, mExternalAvailSize);
+
+        receiver.updateApproximateExternal(bundle);
+    }
+
+    public interface MeasurementReceiver {
+        public void updateApproximateInternal(Bundle bundle);
+
+        public void updateExactInternal(Bundle bundle);
+
+        public void updateApproximateExternal(Bundle bundle);
+    }
+
+    private class MeasurementHandler extends Handler {
+        public static final int MSG_MEASURE_INTERNAL = 1;
+
+        public static final int MSG_MEASURE_EXTERNAL = 2;
+
+        public static final int MSG_CONNECTED = 3;
+
+        public static final int MSG_DISCONNECT = 4;
+
+        public static final int MSG_COMPLETED = 5;
+
+        public static final int MSG_INVALIDATE = 6;
+
+        private List<String> mPendingApps = new ArrayList<String>();
+
+        private Object mLock = new Object();
+
+        private IMediaContainerService mDefaultContainer;
+
+        private volatile boolean mBound = false;
+
+        private volatile boolean mMeasured = false;
+
+        private long mAppsSize = 0;
+
+        private final WeakReference<Context> mContext;
+
+        final private ServiceConnection mDefContainerConn = new ServiceConnection() {
+            public void onServiceConnected(ComponentName name, IBinder service) {
+                final IMediaContainerService imcs = IMediaContainerService.Stub
+                        .asInterface(service);
+                mDefaultContainer = imcs;
+                mBound = true;
+                sendMessage(obtainMessage(MSG_CONNECTED, imcs));
+            }
+
+            public void onServiceDisconnected(ComponentName name) {
+                mBound = false;
+                removeMessages(MSG_CONNECTED);
+            }
+        };
+
+        public MeasurementHandler(Context context, Looper looper) {
+            super(looper);
+            mContext = new WeakReference<Context>(context);
+        }
+
+        @Override
+        public void handleMessage(Message msg) {
+            switch (msg.what) {
+                case MSG_MEASURE_EXTERNAL: {
+                    if (mMeasured) {
+                        sendExternalApproximateUpdate();
+                        break;
+                    }
+
+                    measureApproximateExternalStorage();
+                    break;
+                }
+                case MSG_MEASURE_INTERNAL: {
+                    if (mMeasured) {
+                        sendInternalExactUpdate();
+                        break;
+                    }
+
+                    final Context context = (mContext != null) ? mContext.get() : null;
+                    if (context == null) {
+                        return;
+                    }
+
+                    measureApproximateInternalStorage();
+
+                    synchronized (mLock) {
+                        if (mBound) {
+                            removeMessages(MSG_DISCONNECT);
+                            sendMessage(obtainMessage(MSG_CONNECTED, mDefaultContainer));
+                        } else {
+                            Intent service = new Intent().setComponent(DEFAULT_CONTAINER_COMPONENT);
+                            context.bindService(service, mDefContainerConn,
+                                    Context.BIND_AUTO_CREATE);
+                        }
+                    }
+                    break;
+                }
+                case MSG_CONNECTED: {
+                    IMediaContainerService imcs = (IMediaContainerService) msg.obj;
+                    measureExactInternalStorage(imcs);
+                }
+                case MSG_DISCONNECT: {
+                    synchronized (mLock) {
+                        if (mBound) {
+                            final Context context = (mContext != null) ? mContext.get() : null;
+                            if (context == null) {
+                                return;
+                            }
+
+                            mBound = false;
+                            context.unbindService(mDefContainerConn);
+                        }
+                    }
+                }
+                case MSG_COMPLETED: {
+                    mMeasured = true;
+                    sendInternalExactUpdate();
+                    break;
+                }
+                case MSG_INVALIDATE: {
+                    mMeasured = false;
+                    break;
+                }
+            }
+        }
+
+        public void cleanUp() {
+            removeMessages(MSG_MEASURE_INTERNAL);
+            removeMessages(MSG_MEASURE_EXTERNAL);
+
+            sendEmptyMessage(MSG_DISCONNECT);
+        }
+
+        public void queuePackageMeasurementLocked(String packageName) {
+            mPendingApps.add(packageName);
+        }
+
+        /**
+         * Request measurement of each package.
+         *
+         * @param pm PackageManager instance to query
+         */
+        public void requestQueuedMeasurementsLocked(PackageManager pm) {
+            final int N = mPendingApps.size();
+            for (int i = 0; i < N; i++) {
+                pm.getPackageSizeInfo(mPendingApps.get(i), mStatsObserver);
+            }
+        }
+
+        final IPackageStatsObserver.Stub mStatsObserver = new IPackageStatsObserver.Stub() {
+            public void onGetStatsCompleted(PackageStats stats, boolean succeeded) {
+                if (succeeded) {
+                    mAppsSize += stats.codeSize + stats.dataSize;
+                }
+
+                synchronized (mPendingApps) {
+                    mPendingApps.remove(stats.packageName);
+
+                    if (mPendingApps.size() == 0) {
+                        mInternalAppsSize = mAppsSize;
+
+                        onInternalMeasurementComplete();
+                    }
+                }
+            }
+        };
+
+        private void onInternalMeasurementComplete() {
+            sendEmptyMessage(MSG_COMPLETED);
+        }
+
+        private void measureApproximateInternalStorage() {
+            final File dataPath = Environment.getDataDirectory();
+            final StatFs stat = new StatFs(dataPath.getPath());
+            final long blockSize = stat.getBlockSize();
+            final long totalBlocks = stat.getBlockCount();
+            final long availableBlocks = stat.getAvailableBlocks();
+
+            final long totalSize = totalBlocks * blockSize;
+            final long availSize = availableBlocks * blockSize;
+
+            mInternalTotalSize = totalSize;
+            mInternalAvailSize = availSize;
+
+            sendInternalApproximateUpdate();
+        }
+
+        private void measureExactInternalStorage(IMediaContainerService imcs) {
+            Context context = mContext != null ? mContext.get() : null;
+            if (context == null) {
+                return;
+            }
+
+            // We have to get installd to measure the package sizes.
+            PackageManager pm = context.getPackageManager();
+            if (pm == null) {
+                return;
+            }
+
+            long mediaSize;
+            try {
+                // TODO get these directories from somewhere
+                mediaSize = imcs.calculateDirectorySize("/data/media");
+            } catch (Exception e) {
+                Log.i(TAG, "Could not read memory from default container service");
+                return;
+            }
+
+            mInternalMediaSize = mediaSize;
+
+            final List<ApplicationInfo> apps = pm
+                    .getInstalledApplications(PackageManager.GET_UNINSTALLED_PACKAGES
+                            | PackageManager.GET_DISABLED_COMPONENTS);
+            if (apps != null) {
+                synchronized (mPendingApps) {
+                    for (int i = 0; i < apps.size(); i++) {
+                        final ApplicationInfo info = apps.get(i);
+                        queuePackageMeasurementLocked(info.packageName);
+                    }
+
+                    requestQueuedMeasurementsLocked(pm);
+                }
+            }
+
+            // Sending of the message back to the MeasurementReceiver is
+            // completed in the PackageObserver
+        }
+
+        public void measureApproximateExternalStorage() {
+            File path = Environment.getExternalStorageDirectory();
+
+            StatFs stat = new StatFs(path.getPath());
+            long blockSize = stat.getBlockSize();
+            long totalBlocks = stat.getBlockCount();
+            long availableBlocks = stat.getAvailableBlocks();
+
+            mExternalTotalSize = totalBlocks * blockSize;
+            mExternalAvailSize = availableBlocks * blockSize;
+
+            sendExternalApproximateUpdate();
+        }
+    }
+
+    public void invalidate() {
+        mHandler.sendEmptyMessage(MeasurementHandler.MSG_INVALIDATE);
+    }
+}

src/com/android/settings/deviceinfo/PercentageBarChart.java

@@ -16,8 +16,12 @@
 
 package com.android.settings.deviceinfo;
 
+import com.android.settings.R;
+
 import android.content.Context;
+import android.content.res.TypedArray;
 import android.graphics.Canvas;
+import android.graphics.Color;
 import android.graphics.Paint;
 import android.util.AttributeSet;
 import android.view.View;
@@ -28,7 +32,7 @@ import java.util.Collection;
  * 
  */
 public class PercentageBarChart extends View {
-    private final Paint mBackgroundPaint = new Paint();
+    private final Paint mEmptyPaint = new Paint();
 
     private Collection<Entry> mEntries;
 
@@ -45,20 +49,39 @@ public class PercentageBarChart extends View {
     public PercentageBarChart(Context context, AttributeSet attrs) {
         super(context, attrs);
 
-        mBackgroundPaint.setARGB(255, 64, 64, 64);
+        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.PercentageBarChart, 0, 0);
-        mBackgroundPaint.setStyle(Paint.Style.FILL);
+
+        int emptyColor = Color.BLACK;
+
+        int n = a.getIndexCount();
+        for (int i = 0; i < n; i++) {
+            int attr = a.getIndex(i);
+
+            switch (attr) {
+                case R.styleable.PercentageBarChart_emptyColor:
+                    emptyColor = a.getColor(attr, 0);
+                    break;
+            }
+        }
+
+        a.recycle();
+
+        mEmptyPaint.setColor(emptyColor);
+        mEmptyPaint.setStyle(Paint.Style.FILL);
     }
 
     @Override
     protected void onDraw(Canvas canvas) {
         super.onDraw(canvas);
 
-        final int width = getWidth();
+        final int left = getPaddingLeft();
-        final int height = getHeight();
+        final int right = getWidth() - getPaddingRight();
+        final int top = getPaddingTop();
+        final int bottom = getHeight() - getPaddingBottom();
 
-        canvas.drawPaint(mBackgroundPaint);
+        final int width = right - left;
 
-        int lastX = 0;
+        int lastX = left;
 
         if (mEntries != null) {
             for (final Entry e : mEntries) {
@@ -70,14 +93,16 @@ public class PercentageBarChart extends View {
                 }
 
                 final int nextX = lastX + entryWidth;
-                if (nextX >= width) {
+                if (nextX >= right) {
                     break;
                 }
 
-                canvas.drawRect(lastX, 0, nextX, height, e.paint);
+                canvas.drawRect(lastX, top, nextX, bottom, e.paint);
                 lastX = nextX;
             }
         }
+
+        canvas.drawRect(lastX, top, lastX + width, bottom, mEmptyPaint);
     }
 
     /**
@@ -85,7 +110,7 @@ public class PercentageBarChart extends View {
      * calling {@link #invalidate()}.
      */
     public void setBackgroundColor(int color) {
-        mBackgroundPaint.setColor(color);
+        mEmptyPaint.setColor(color);
     }
 
     /**