src/com/android/settings/HomeSettings.java - platform/packages/apps/Settings - Git at Google

 /*
  * 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.app.ActivityManager;
 import android.content.ComponentName;
 import android.content.Context;
 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.PackageInfo;
 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 HOME_PREFS = "home_prefs";
     public static final String HOME_PREFS_DO_SHOW = "do_show";

     public static final String HOME_SHOW_NOTICE = "show";

     PreferenceGroup mPrefGroup;

     PackageManager mPm;
     ComponentName[] mHomeComponentSet;
     ArrayList<HomeAppPreference> mPrefs;
     HomeAppPreference mCurrentHome = null;
     final IntentFilter mHomeFilter;
     boolean mShowNotice;

     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.uninstallTarget);
        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;
                     }
                 }
             }
         }

         // If we're down to just one possible home app, back out of this settings
         // fragment and show a dialog explaining to the user that they won't see
         // 'Home' settings now until such time as there are multiple available.
         if (mPrefs.size() < 2) {
             if (mShowNotice) {
                 mShowNotice = false;
                 Settings.requestHomeNotice();
             }
             finishFragment();
         }
     }

     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);
                 HomeAppPreference pref = new HomeAppPreference(context, activityName, prefIndex,
                         icon, name, this, info);
                 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");

         Bundle args = getArguments();
         mShowNotice = (args != null) && args.getBoolean(HOME_SHOW_NOTICE, false);
     }

     @Override
     public void onResume() {
         super.onResume();
         buildHomeActivitiesList();
     }

     class HomeAppPreference extends Preference {
         ComponentName activityName;
         int index;
         HomeSettings fragment;
         final ColorFilter grayscaleFilter;
         boolean isChecked;

         boolean isSystem;
         String uninstallTarget;

         public HomeAppPreference(Context context, ComponentName activity,
                 int i, Drawable icon, CharSequence title,
                 HomeSettings parent, ActivityInfo info) {
             super(context);
             setLayoutResource(R.layout.preference_home_app);
             setIcon(icon);
             setTitle(title);
             activityName = activity;
             fragment = parent;
             index = i;

             ColorMatrix colorMatrix = new ColorMatrix();
             colorMatrix.setSaturation(0f);
             float[] matrix = colorMatrix.getArray();
             matrix[18] = 0.5f;
             grayscaleFilter = new ColorMatrixColorFilter(colorMatrix);

             determineTargets(info);
         }

         // Check whether this activity is bundled on the system, with awareness
         // of the META_HOME_ALTERNATE mechanism.
         private void determineTargets(ActivityInfo info) {
             final Bundle meta = info.metaData;
             if (meta != null) {
                 final String altHomePackage = meta.getString(ActivityManager.META_HOME_ALTERNATE);
                 if (altHomePackage != null) {
                     try {
                         final int match = mPm.checkSignatures(info.packageName, altHomePackage);
                         if (match >= PackageManager.SIGNATURE_MATCH) {
                             PackageInfo altInfo = mPm.getPackageInfo(altHomePackage, 0);
                             final int altFlags = altInfo.applicationInfo.flags;
                             isSystem = (altFlags & ApplicationInfo.FLAG_SYSTEM) != 0;
                             uninstallTarget = altInfo.packageName;
                             return;
                         }
                     } catch (Exception e) {
                         // e.g. named alternate package not found during lookup
                         Log.w(TAG, "Unable to compare/resolve alternate", e);
                     }
                 }
             }
             // No suitable metadata redirect, so use the package's own info
             isSystem = (info.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0;
             uninstallTarget = info.packageName;
         }

         @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();
             }
         }
     }
 }
	/*
	* 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.app.ActivityManager;
	import android.content.ComponentName;
	import android.content.Context;
	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.PackageInfo;
	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 HOME_PREFS = "home_prefs";
	public static final String HOME_PREFS_DO_SHOW = "do_show";

	public static final String HOME_SHOW_NOTICE = "show";

	PreferenceGroup mPrefGroup;

	PackageManager mPm;
	ComponentName[] mHomeComponentSet;
	ArrayList<HomeAppPreference> mPrefs;
	HomeAppPreference mCurrentHome = null;
	final IntentFilter mHomeFilter;
	boolean mShowNotice;

	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.uninstallTarget);
	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;
	}
	}
	}
	}

	// If we're down to just one possible home app, back out of this settings
	// fragment and show a dialog explaining to the user that they won't see
	// 'Home' settings now until such time as there are multiple available.
	if (mPrefs.size() < 2) {
	if (mShowNotice) {
	mShowNotice = false;
	Settings.requestHomeNotice();
	}
	finishFragment();
	}
	}

	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);
	HomeAppPreference pref = new HomeAppPreference(context, activityName, prefIndex,
	icon, name, this, info);
	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");

	Bundle args = getArguments();
	mShowNotice = (args != null) && args.getBoolean(HOME_SHOW_NOTICE, false);
	}

	@Override
	public void onResume() {
	super.onResume();
	buildHomeActivitiesList();
	}

	class HomeAppPreference extends Preference {
	ComponentName activityName;
	int index;
	HomeSettings fragment;
	final ColorFilter grayscaleFilter;
	boolean isChecked;

	boolean isSystem;
	String uninstallTarget;

	public HomeAppPreference(Context context, ComponentName activity,
	int i, Drawable icon, CharSequence title,
	HomeSettings parent, ActivityInfo info) {
	super(context);
	setLayoutResource(R.layout.preference_home_app);
	setIcon(icon);
	setTitle(title);
	activityName = activity;
	fragment = parent;
	index = i;

	ColorMatrix colorMatrix = new ColorMatrix();
	colorMatrix.setSaturation(0f);
	float[] matrix = colorMatrix.getArray();
	matrix[18] = 0.5f;
	grayscaleFilter = new ColorMatrixColorFilter(colorMatrix);

	determineTargets(info);
	}

	// Check whether this activity is bundled on the system, with awareness
	// of the META_HOME_ALTERNATE mechanism.
	private void determineTargets(ActivityInfo info) {
	final Bundle meta = info.metaData;
	if (meta != null) {
	final String altHomePackage = meta.getString(ActivityManager.META_HOME_ALTERNATE);
	if (altHomePackage != null) {
	try {
	final int match = mPm.checkSignatures(info.packageName, altHomePackage);
	if (match >= PackageManager.SIGNATURE_MATCH) {
	PackageInfo altInfo = mPm.getPackageInfo(altHomePackage, 0);
	final int altFlags = altInfo.applicationInfo.flags;
	isSystem = (altFlags & ApplicationInfo.FLAG_SYSTEM) != 0;
	uninstallTarget = altInfo.packageName;
	return;
	}
	} catch (Exception e) {
	// e.g. named alternate package not found during lookup
	Log.w(TAG, "Unable to compare/resolve alternate", e);
	}
	}
	}
	// No suitable metadata redirect, so use the package's own info
	isSystem = (info.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0;
	uninstallTarget = info.packageName;
	}

	@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();
	}
	}
	}
	}