Introduce 'Home' settings

Bug 9958444

Change-Id: I868f5b7aa6ae9273b725cb96e80821a82569e7e0

res/layout/preference_home_app.xml

@@ -0,0 +1,80 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2013 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:minHeight="?android:attr/listPreferredItemHeight"
+    android:gravity="center_vertical"
+    android:paddingStart="@*android:dimen/preference_item_padding_side">
+
+    <LinearLayout
+        android:layout_width="wrap_content"
+        android:layout_height="match_parent"
+        android:layout_weight="1"
+        android:id="@+id/home_app_pref"
+        android:focusable="true"
+        android:clickable="true"
+        android:gravity="center_vertical"
+        android:background="?android:attr/selectableItemBackground" >
+            <RadioButton
+                android:id="@+id/home_radio"
+                android:layout_width="wrap_content"
+                android:layout_height="match_parent"
+                android:layout_marginStart="10dip"
+                android:layout_marginEnd="4dip"
+                android:layout_gravity="center_vertical"
+                android:orientation="vertical"
+                android:clickable="false"
+                android:focusable="false" />
+            <ImageView
+                android:id="@+android:id/icon"
+                android:layout_width="48dp"
+                android:layout_height="48dp"
+                android:layout_gravity="center"
+                android:minWidth="48dp"
+                android:scaleType="centerInside"
+                android:layout_marginEnd="@*android:dimen/preference_item_padding_inner"
+                />
+            <TextView
+                android:id="@+android:id/title"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:singleLine="true"
+                android:layout_weight="1"
+                android:textAppearance="?android:attr/textAppearanceMedium"
+                android:ellipsize="end" />
+    </LinearLayout>
+    <View
+        android:id="@+id/home_divider"
+        android:layout_width="2dip"
+        android:layout_height="match_parent"
+        android:layout_marginTop="5dip"
+        android:layout_marginBottom="5dip"
+        android:background="@android:drawable/divider_horizontal_dark" />
+    <ImageView
+        android:id="@+id/home_app_uninstall"
+        android:layout_width="wrap_content"
+        android:layout_height="fill_parent"
+        android:paddingStart="12dip"
+        android:paddingEnd="12dp"
+        android:src="@drawable/ic_menu_delete_holo_dark"
+        android:contentDescription="@string/home_app_uninstall_button"
+        android:layout_gravity="center"
+        android:clickable="true"
+        android:focusable="true"
+        android:background="?android:attr/selectableItemBackground" />
+</LinearLayout>

res/values/strings.xml

@@ -1732,6 +1732,7 @@
     <!-- Sound and alerts settings -->
     <skip/>
     <!-- Main Settings screen setting option name to go into the display settings screen -->
+    <string name="home_settings">Home</string>
     <string name="display_settings_title">Display</string>
     <!-- Sound settings screen heading -->
     <string name="sound_settings">Sound</string>
@@ -4667,6 +4668,9 @@
     <!-- Applicaitons with restrictions - settings button [CHAR LIMIT=30] -->
     <string name="apps_with_restrictions_settings_button">Expand settings for application</string>
 
+    <!-- Home application selection - uninstall button [CHAR LIMIT=80] -->
+    <string name="home_app_uninstall_button">Uninstall this application</string>
+
     <!-- Warning message when changing a global setting for a tablet.[CHAR LIMIT=none] -->
     <string name="global_change_warning" product="tablet">This setting affects all users on this tablet.</string>
     <!-- Warning message when changing a global setting for a phone.[CHAR LIMIT=none] -->

res/xml/home_selection.xml

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2013 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+
+<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
+        android:title="@string/home_settings"
+        xmlns:settings="http://schemas.android.com/apk/res/com.android.settings"
+        android:key="home"
+        android:order="0">
+
+</PreferenceScreen>

res/xml/settings_headers.xml

@@ -62,6 +62,13 @@
     <header android:id="@+id/device_section"
         android:title="@string/header_category_device" />
 
+    <!-- Home -->
+    <header
+        android:id="@+id/home_settings"
+        android:icon="@drawable/ic_settings_home"
+        android:fragment="com.android.settings.HomeSettings"
+        android:title="@string/home_settings" />
+
     <!-- Sound -->
     <header
         android:id="@+id/sound_settings"

src/com/android/settings/HomeSettings.java

@@ -0,0 +1,243 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings;
+
+import java.util.ArrayList;
+
+import android.content.ComponentName;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.content.pm.ActivityInfo;
+import android.content.pm.ApplicationInfo;
+import android.content.pm.PackageManager;
+import android.content.pm.ResolveInfo;
+import android.graphics.ColorFilter;
+import android.graphics.ColorMatrix;
+import android.graphics.ColorMatrixColorFilter;
+import android.graphics.drawable.Drawable;
+import android.net.Uri;
+import android.os.Bundle;
+import android.os.Handler;
+import android.preference.Preference;
+import android.preference.PreferenceGroup;
+import android.util.Log;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.widget.ImageView;
+import android.widget.RadioButton;
+
+public class HomeSettings extends SettingsPreferenceFragment {
+    static final String TAG = "HomeSettings";
+
+    static final int REQUESTING_UNINSTALL = 10;
+
+    public static final String CURRENT_HOME = "current_home";
+
+    PreferenceGroup mPrefGroup;
+
+    PackageManager mPm;
+    ComponentName[] mHomeComponentSet;
+    ArrayList<HomeAppPreference> mPrefs;
+    HomeAppPreference mCurrentHome = null;
+    final IntentFilter mHomeFilter;
+
+    public HomeSettings() {
+        mHomeFilter = new IntentFilter(Intent.ACTION_MAIN);
+        mHomeFilter.addCategory(Intent.CATEGORY_HOME);
+        mHomeFilter.addCategory(Intent.CATEGORY_DEFAULT);
+    }
+
+    OnClickListener mHomeClickListener = new OnClickListener() {
+        @Override
+        public void onClick(View v) {
+            int index = (Integer)v.getTag();
+            HomeAppPreference pref = mPrefs.get(index);
+            if (!pref.isChecked) {
+                makeCurrentHome(pref);
+            }
+        }
+    };
+
+    OnClickListener mDeleteClickListener = new OnClickListener() {
+        @Override
+        public void onClick(View v) {
+            int index = (Integer)v.getTag();
+            uninstallApp(mPrefs.get(index));
+        }
+    };
+
+    void makeCurrentHome(HomeAppPreference newHome) {
+        if (mCurrentHome != null) {
+            mCurrentHome.setChecked(false);
+        }
+        newHome.setChecked(true);
+        mCurrentHome = newHome;
+
+        mPm.replacePreferredActivity(mHomeFilter, IntentFilter.MATCH_CATEGORY_EMPTY,
+                mHomeComponentSet, newHome.activityName);
+    }
+
+    void uninstallApp(HomeAppPreference pref) {
+        // Uninstallation is done by asking the OS to do it
+       Uri packageURI = Uri.parse("package:" + pref.activityName.getPackageName());
+       Intent uninstallIntent = new Intent(Intent.ACTION_UNINSTALL_PACKAGE, packageURI);
+       uninstallIntent.putExtra(Intent.EXTRA_UNINSTALL_ALL_USERS, false);
+       int requestCode = REQUESTING_UNINSTALL + (pref.isChecked ? 1 : 0);
+       startActivityForResult(uninstallIntent, requestCode);
+   }
+
+    @Override
+    public void onActivityResult(int requestCode, int resultCode, Intent data) {
+        super.onActivityResult(requestCode, resultCode, data);
+
+        // Rebuild the list now that we might have nuked something
+        buildHomeActivitiesList();
+
+        // if the previous home app is now gone, fall back to the system one
+        if (requestCode > REQUESTING_UNINSTALL) {
+            // if mCurrentHome has gone null, it means we didn't find the previously-
+            // default home app when rebuilding the list, i.e. it was the one we
+            // just uninstalled.  When that happens we make the system-bundled
+            // home app the active default.
+            if (mCurrentHome == null) {
+                for (int i = 0; i < mPrefs.size(); i++) {
+                    HomeAppPreference pref = mPrefs.get(i);
+                    if (pref.isSystem) {
+                        makeCurrentHome(pref);
+                        break;
+                    }
+                }
+            }
+        }
+    }
+
+    void buildHomeActivitiesList() {
+        ArrayList<ResolveInfo> homeActivities = new ArrayList<ResolveInfo>();
+        ComponentName currentDefaultHome  = mPm.getHomeActivities(homeActivities);
+
+        Context context = getActivity();
+        mCurrentHome = null;
+        mPrefGroup.removeAll();
+        mPrefs = new ArrayList<HomeAppPreference>();
+        mHomeComponentSet = new ComponentName[homeActivities.size()];
+        int prefIndex = 0;
+        for (int i = 0; i < homeActivities.size(); i++) {
+            final ResolveInfo candidate = homeActivities.get(i);
+            final ActivityInfo info = candidate.activityInfo;
+            ComponentName activityName = new ComponentName(info.packageName, info.name);
+            mHomeComponentSet[i] = activityName;
+            try {
+                Drawable icon = info.loadIcon(mPm);
+                CharSequence name = info.loadLabel(mPm);
+                boolean isSystem = (info.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0;
+                HomeAppPreference pref = new HomeAppPreference(context, activityName, prefIndex,
+                        icon, name, this, isSystem);
+                mPrefs.add(pref);
+                mPrefGroup.addPreference(pref);
+                pref.setEnabled(true);
+                if (activityName.equals(currentDefaultHome)) {
+                    mCurrentHome = pref;
+                }
+                prefIndex++;
+            } catch (Exception e) {
+                Log.v(TAG, "Problem dealing with activity " + activityName, e);
+            }
+        }
+
+        if (mCurrentHome != null) {
+            new Handler().post(new Runnable() {
+               public void run() {
+                   mCurrentHome.setChecked(true);
+               }
+            });
+        }
+    }
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        addPreferencesFromResource(R.xml.home_selection);
+
+        mPm = getPackageManager();
+        mPrefGroup = (PreferenceGroup) findPreference("home");
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        buildHomeActivitiesList();
+    }
+
+    class HomeAppPreference extends Preference {
+        ComponentName activityName;
+        int index;
+        boolean isSystem;
+        HomeSettings fragment;
+        final ColorFilter grayscaleFilter;
+        boolean isChecked;
+
+        public HomeAppPreference(Context context, ComponentName activity,
+                int i, Drawable icon, CharSequence title,
+                HomeSettings parent, boolean sys) {
+            super(context);
+            setLayoutResource(R.layout.preference_home_app);
+            setIcon(icon);
+            setTitle(title);
+            activityName = activity;
+            fragment = parent;
+            index = i;
+            isSystem = sys;
+
+            ColorMatrix colorMatrix = new ColorMatrix();
+            colorMatrix.setSaturation(0f);
+            float[] matrix = colorMatrix.getArray();
+            matrix[18] = 0.5f;
+            grayscaleFilter = new ColorMatrixColorFilter(colorMatrix);
+        }
+
+        @Override
+        protected void onBindView(View view) {
+            super.onBindView(view);
+
+            RadioButton radio = (RadioButton) view.findViewById(R.id.home_radio);
+            radio.setChecked(isChecked);
+
+            Integer indexObj = new Integer(index);
+
+            ImageView icon = (ImageView) view.findViewById(R.id.home_app_uninstall);
+            if (isSystem) {
+                icon.setEnabled(false);
+                icon.setColorFilter(grayscaleFilter);
+            } else {
+                icon.setOnClickListener(mDeleteClickListener);
+                icon.setTag(indexObj);
+            }
+
+            View v = view.findViewById(R.id.home_app_pref);
+            v.setOnClickListener(mHomeClickListener);
+            v.setTag(indexObj);
+        }
+
+        void setChecked(boolean state) {
+            if (state != isChecked) {
+                isChecked = state;
+                notifyChanged();
+            }
+        }
+    }
+}

src/com/android/settings/Settings.java

@@ -26,8 +26,10 @@ import android.content.Intent;
 import android.content.IntentFilter;
 import android.content.SharedPreferences;
 import android.content.pm.ActivityInfo;
+import android.content.pm.ApplicationInfo;
 import android.content.pm.PackageManager;
 import android.content.pm.PackageManager.NameNotFoundException;
+import android.content.pm.ResolveInfo;
 import android.graphics.drawable.Drawable;
 import android.os.Bundle;
 import android.os.INetworkManagementService;
@@ -144,7 +146,8 @@ public class Settings extends PreferenceActivity
             R.id.about_settings,
             R.id.accessibility_settings,
             R.id.print_settings,
-            R.id.nfc_payment_settings
+            R.id.nfc_payment_settings,
+            R.id.home_settings
     };
 
     private SharedPreferences mDevelopmentPreferences;
@@ -558,6 +561,8 @@ public class Settings extends PreferenceActivity
             } else if (id == R.id.account_settings) {
                 int headerIndex = i + 1;
                 i = insertAccountsHeaders(target, headerIndex);
+            } else if (id == R.id.home_settings) {
+                updateHomeSettingHeaders(header);
             } else if (id == R.id.user_settings) {
                 if (!UserHandle.MU_ENABLED
                         || !UserManager.supportsMultipleUsers()
@@ -658,6 +663,51 @@ public class Settings extends PreferenceActivity
         return headerIndex;
     }
 
+    private boolean isSystemApp(ResolveInfo ri) {
+        return ((ri.activityInfo.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0);
+    }
+
+    private void updateHomeSettingHeaders(Header header) {
+        final PackageManager pm = getPackageManager();
+        final ArrayList<ResolveInfo> homeApps = new ArrayList<ResolveInfo>();
+        try {
+            ComponentName currentHome = pm.getHomeActivities(homeApps);
+            ResolveInfo iconSource = null;
+            if (currentHome == null) {
+                // no current default, so find the system home app and use that
+                for (int which = 0; which < homeApps.size(); which++) {
+                    ResolveInfo ri = homeApps.get(which);
+                    if (isSystemApp(ri)) {
+                        iconSource = ri;
+                        break;
+                    }
+                }
+            } else {
+                // find the current-home entry in the returned set
+                for (int which = 0; which < homeApps.size(); which++) {
+                    ResolveInfo ri = homeApps.get(which);
+                    ComponentName riName = new ComponentName(ri.activityInfo.packageName,
+                            ri.activityInfo.name);
+                    if (riName.equals(currentHome)) {
+                        iconSource = ri;
+                        break;
+                    }
+                }
+            }
+            if (iconSource != null) {
+                if (header.extras == null) {
+                    header.extras = new Bundle();
+                }
+                header.extras.putParcelable(HomeSettings.CURRENT_HOME, iconSource.activityInfo);
+            } else {
+                Log.v(LOG_TAG, "No home app icon found");
+            }
+        } catch (Exception e) {
+            // Can't look up the home activity; bail on configuring the icon
+            Log.w(LOG_TAG, "Problem looking up home activity!", e);
+        }
+    }
+
     private void getMetaData() {
         try {
             ActivityInfo ai = getPackageManager().getActivityInfo(getComponentName(),
@@ -820,17 +870,17 @@ public class Settings extends PreferenceActivity
 
                     //$FALL-THROUGH$
                 case HEADER_TYPE_NORMAL:
-                    if (header.extras != null
-                            && header.extras.containsKey(ManageAccountsSettings.KEY_ACCOUNT_TYPE)) {
+                    if (header.extras != null &&
+                            header.extras.containsKey(ManageAccountsSettings.KEY_ACCOUNT_TYPE)) {
                         String accType = header.extras.getString(
                                 ManageAccountsSettings.KEY_ACCOUNT_TYPE);
-                        ViewGroup.LayoutParams lp = holder.icon.getLayoutParams();
-                        lp.width = getContext().getResources().getDimensionPixelSize(
-                                R.dimen.header_icon_width);
-                        lp.height = lp.width;
-                        holder.icon.setLayoutParams(lp);
                         Drawable icon = mAuthHelper.getDrawableForType(getContext(), accType);
-                        holder.icon.setImageDrawable(icon);
+                        setHeaderIcon(holder, icon);
+                    } else if (header.extras != null &&
+                            header.extras.containsKey(HomeSettings.CURRENT_HOME)) {
+                        ActivityInfo ai = header.extras.getParcelable(HomeSettings.CURRENT_HOME);
+                        Drawable icon = ai.loadIcon(getContext().getPackageManager());
+                        setHeaderIcon(holder, icon);
                     } else {
                         holder.icon.setImageResource(header.iconRes);
                     }
@@ -848,6 +898,15 @@ public class Settings extends PreferenceActivity
             return view;
         }
 
+        private void setHeaderIcon(HeaderViewHolder holder, Drawable icon) {
+            ViewGroup.LayoutParams lp = holder.icon.getLayoutParams();
+            lp.width = getContext().getResources().getDimensionPixelSize(
+                    R.dimen.header_icon_width);
+            lp.height = lp.width;
+            holder.icon.setLayoutParams(lp);
+            holder.icon.setImageDrawable(icon);
+        }
+
         public void resume() {
             mWifiEnabler.resume();
             mBluetoothEnabler.resume();