Shows trash category in Storage Settings

If there is APP which supports VIEW_TRASH intent,
use it to show trash files. Otherwise popup a dialog
to guide users to empty trash files.

Bug: 189109564
Test: manual visual
      Observe size information are the same as files in Files APP.
      Observe if empty trash button empty trash files.
      Observe if Trash category update summary and order after emptying
      trash files.
Change-Id: Ia3c46dcb1b4fadcdfb865f7dd315c27f8f98cb2c

res/drawable/ic_trash_can.xml

@@ -18,7 +18,8 @@
     android:width="24dp"
     android:height="24dp"
     android:viewportWidth="24"
-    android:viewportHeight="24">
+    android:viewportHeight="24"
+    android:tint="?android:attr/colorControlNormal">
   <path
       android:pathData="M15,3V4H20V6H19V19C19,20.1 18.1,21 17,21H7C5.9,21 5,20.1 5,19V6H4V4H9V3H15ZM7,19H17V6H7V19ZM9,8H11V17H9V8ZM15,8H13V17H15V8Z"
       android:fillColor="#5F6368"

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

@@ -17,8 +17,6 @@
 package com.android.settings.deviceinfo;
 
 import android.content.Context;
-import android.text.TextUtils;
-import android.text.format.Formatter;
 import android.util.AttributeSet;
 import android.widget.ProgressBar;
 
@@ -26,6 +24,7 @@ import androidx.preference.Preference;
 import androidx.preference.PreferenceViewHolder;
 
 import com.android.settings.R;
+import com.android.settings.deviceinfo.storage.StorageUtils;
 
 public class StorageItemPreference extends Preference {
     public int userHandle;
@@ -49,7 +48,7 @@ public class StorageItemPreference extends Preference {
 
     public void setStorageSize(long size, long total) {
         mStorageSize = size;
-        setSummary(getStorageSummary(size));
+        setSummary(StorageUtils.getStorageSizeLabel(getContext(), size));
 
         if (total == 0) {
             mProgressPercent = 0;
@@ -77,11 +76,4 @@ public class StorageItemPreference extends Preference {
         updateProgressBar();
         super.onBindViewHolder(view);
     }
-
-    private String getStorageSummary(long bytes) {
-        final Formatter.BytesResult result = Formatter.formatBytes(getContext().getResources(),
-                bytes, Formatter.FLAG_SHORTER);
-        return TextUtils.expandTemplate(getContext().getText(R.string.storage_size_large),
-                result.value, result.units).toString();
-    }
 }

src/com/android/settings/deviceinfo/storage/EmptyTrashFragment.java

@@ -18,25 +18,54 @@ package com.android.settings.deviceinfo.storage;
 
 import android.app.Dialog;
 import android.app.settings.SettingsEnums;
+import android.content.Context;
+import android.content.pm.PackageManager.NameNotFoundException;
 import android.os.Bundle;
+import android.os.UserHandle;
+import android.provider.MediaStore;
+import android.util.Log;
 
 import androidx.appcompat.app.AlertDialog;
 import androidx.fragment.app.Fragment;
 
 import com.android.settings.R;
 import com.android.settings.core.instrumentation.InstrumentedDialogFragment;
+import com.android.settingslib.utils.ThreadUtils;
 
 /**
  * Dialog asks if users want to empty trash files.
+ * TODO(b/189388449): Shows "Deleting..." and disables Trash category while deleting trash files.
  */
 public class EmptyTrashFragment extends InstrumentedDialogFragment {
+    private static final String TAG = "EmptyTrashFragment";
+
     private static final String TAG_EMPTY_TRASH = "empty_trash";
 
+    private final Fragment mParentFragment;
+    private final int mUserId;
+    private final long mTrashSize;
+    private final OnEmptyTrashCompleteListener mOnEmptyTrashCompleteListener;
+
+    /** The listener to receive empty trash complete callback event. */
+    public interface OnEmptyTrashCompleteListener {
+        /** The empty trash complete callback. */
+        void onEmptyTrashComplete();
+    }
+
+    public EmptyTrashFragment(Fragment parent, int userId, long trashSize,
+            OnEmptyTrashCompleteListener onEmptyTrashCompleteListener) {
+        super();
+
+        mParentFragment = parent;
+        setTargetFragment(mParentFragment, 0 /* requestCode */);
+        mUserId = userId;
+        mTrashSize = trashSize;
+        mOnEmptyTrashCompleteListener = onEmptyTrashCompleteListener;
+    }
+
     /** Shows the empty trash dialog. */
-    public static void show(Fragment parent) {
+    public void show() {
-        final EmptyTrashFragment dialog = new EmptyTrashFragment();
+        show(mParentFragment.getFragmentManager(), TAG_EMPTY_TRASH);
-        dialog.setTargetFragment(parent, 0 /* requestCode */);
-        dialog.show(parent.getFragmentManager(), TAG_EMPTY_TRASH);
     }
 
     @Override
@@ -48,10 +77,38 @@ public class EmptyTrashFragment extends InstrumentedDialogFragment {
     public Dialog onCreateDialog(Bundle savedInstanceState) {
         final AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
         return builder.setTitle(R.string.storage_trash_dialog_title)
-                .setMessage(R.string.storage_trash_dialog_ask_message)
+                .setMessage(getActivity().getString(R.string.storage_trash_dialog_ask_message,
-                .setPositiveButton(R.string.storage_trash_dialog_confirm, (dialog, which) -> {
+                        StorageUtils.getStorageSizeLabel(getActivity(), mTrashSize)))
-                    // TODO(170918505): Implement the logic in worker thread.
+                .setPositiveButton(R.string.storage_trash_dialog_confirm,
-                }).setNegativeButton(android.R.string.cancel, null)
+                        (dialog, which) -> emptyTrashAsync())
+                .setNegativeButton(android.R.string.cancel, null)
                 .create();
     }
+
+    private void emptyTrashAsync() {
+        final Context context = getActivity();
+        final Context perUserContext;
+        try {
+            perUserContext = context.createPackageContextAsUser(
+                context.getApplicationContext().getPackageName(),
+                0 /* flags= */,
+                UserHandle.of(mUserId));
+        } catch (NameNotFoundException e) {
+            Log.e(TAG, "Not able to get Context for user ID " + mUserId);
+            return;
+        }
+
+        final Bundle trashQueryArgs = new Bundle();
+        trashQueryArgs.putInt(MediaStore.QUERY_ARG_MATCH_TRASHED, MediaStore.MATCH_ONLY);
+        ThreadUtils.postOnBackgroundThread(() -> {
+            perUserContext.getContentResolver().delete(
+                    MediaStore.Files.getContentUri(MediaStore.VOLUME_EXTERNAL),
+                    trashQueryArgs);
+            if (mOnEmptyTrashCompleteListener == null) {
+                return;
+            }
+            ThreadUtils.postOnMainThread(
+                    () -> mOnEmptyTrashCompleteListener.onEmptyTrashComplete());
+        });
+    }
 }

src/com/android/settings/deviceinfo/storage/StorageItemPreferenceController.java

@@ -32,6 +32,7 @@ import android.os.UserManager;
 import android.os.storage.VolumeInfo;
 import android.util.Log;
 import android.util.SparseArray;
+import android.widget.Toast;
 
 import androidx.annotation.VisibleForTesting;
 import androidx.fragment.app.Fragment;
@@ -64,7 +65,8 @@ import java.util.Map;
  * categorization breakdown.
  */
 public class StorageItemPreferenceController extends AbstractPreferenceController implements
-        PreferenceControllerMixin {
+        PreferenceControllerMixin,
+        EmptyTrashFragment.OnEmptyTrashCompleteListener {
     private static final String TAG = "StorageItemPreference";
 
     private static final String SYSTEM_FRAGMENT_TAG = "SystemInfo";
@@ -256,8 +258,7 @@ public class StorageItemPreferenceController extends AbstractPreferenceControlle
         mGamesPreference.setVisible(privateStoragePreferencesVisible);
         mDocumentsAndOtherPreference.setVisible(privateStoragePreferencesVisible);
         mSystemPreference.setVisible(privateStoragePreferencesVisible);
-        // TODO(b/170918505): Shows trash category after trash category feature complete.
+        mTrashPreference.setVisible(privateStoragePreferencesVisible);
-        mTrashPreference.setVisible(false);
 
         if (privateStoragePreferencesVisible) {
             final VolumeInfo sharedVolume = mSvp.findEmulatedForPrivate(mVolume);
@@ -460,13 +461,29 @@ public class StorageItemPreferenceController extends AbstractPreferenceControlle
     private void launchTrashIntent() {
         final Intent intent = new Intent("android.settings.VIEW_TRASH");
 
-        if (intent.resolveActivity(mPackageManager) == null) {
+        if (mPackageManager.resolveActivityAsUser(intent, 0 /* flags */, mUserId) == null) {
-            EmptyTrashFragment.show(mFragment);
+            final long trashSize = mTrashPreference.getStorageSize();
+            if (trashSize > 0) {
+                new EmptyTrashFragment(mFragment, mUserId, trashSize,
+                        this /* onEmptyTrashCompleteListener */).show();
+            } else {
+                Toast.makeText(mContext, R.string.storage_trash_dialog_empty_message,
+                        Toast.LENGTH_SHORT).show();
+            }
         } else {
             mContext.startActivityAsUser(intent, new UserHandle(mUserId));
         }
     }
 
+    @Override
+    public void onEmptyTrashComplete() {
+        if (mTrashPreference == null) {
+            return;
+        }
+        mTrashPreference.setStorageSize(0, mTotalSize);
+        updatePrivateStorageCategoryPreferencesOrder();
+    }
+
     private static long totalValues(StorageMeasurement.MeasurementDetails details, int userId,
             String... keys) {
         long total = 0;

src/com/android/settings/deviceinfo/storage/StorageUtils.java

@@ -26,6 +26,8 @@ import android.os.storage.DiskInfo;
 import android.os.storage.StorageManager;
 import android.os.storage.VolumeInfo;
 import android.os.storage.VolumeRecord;
+import android.text.TextUtils;
+import android.text.format.Formatter;
 import android.util.Log;
 import android.widget.Toast;
 
@@ -115,6 +117,14 @@ public class StorageUtils {
                 .launch();
     }
 
+    /** Returns size label of changing units. (e.g., 1kB, 2MB, 3GB) */
+    public static String getStorageSizeLabel(Context context, long bytes) {
+        final Formatter.BytesResult result = Formatter.formatBytes(context.getResources(),
+                bytes, Formatter.FLAG_SHORTER);
+        return TextUtils.expandTemplate(context.getText(R.string.storage_size_large),
+                result.value, result.units).toString();
+    }
+
     /** An AsyncTask to unmount a specified volume. */
     public static class UnmountTask extends AsyncTask<Void, Void, Exception> {
         private final Context mContext;