FileDocCategorySizeDatePackage
Home.javaAPI DocAndroid 1.5 Example25922Tue Aug 09 22:58:00 BST 2011com.example.android.home

Home

public class Home extends android.app.Activity

Fields Summary
private static final String
LOG_TAG
Tag used for logging errors.
private static final String
KEY_SAVE_GRID_OPENED
Keys during freeze/thaw.
private static final String
DEFAULT_FAVORITES_PATH
private static final String
TAG_FAVORITES
private static final String
TAG_FAVORITE
private static final String
TAG_PACKAGE
private static final String
TAG_CLASS
private static final int
MENU_WALLPAPER_SETTINGS
private static final int
MENU_SEARCH
private static final int
MENU_SETTINGS
private static final int
MAX_RECENT_TASKS
Maximum number of recent tasks to query.
private static boolean
mWallpaperChecked
private static ArrayList
mApplications
private static LinkedList
mFavorites
private final android.content.BroadcastReceiver
mWallpaperReceiver
private final android.content.BroadcastReceiver
mApplicationsReceiver
private android.widget.GridView
mGrid
private android.view.animation.LayoutAnimationController
mShowLayoutAnimation
private android.view.animation.LayoutAnimationController
mHideLayoutAnimation
private boolean
mBlockAnimation
private android.view.View
mShowApplications
private android.widget.CheckBox
mShowApplicationsCheck
private ApplicationsStackLayout
mApplicationsStack
private android.view.animation.Animation
mGridEntry
private android.view.animation.Animation
mGridExit
Constructors Summary
Methods Summary
private static voidbeginDocument(org.xmlpull.v1.XmlPullParser parser, java.lang.String firstElementName)


        int type;
        while ((type = parser.next()) != XmlPullParser.START_TAG &&
                type != XmlPullParser.END_DOCUMENT) {
            // Empty
        }

        if (type != XmlPullParser.START_TAG) {
            throw new XmlPullParserException("No start tag found");
        }

        if (!parser.getName().equals(firstElementName)) {
            throw new XmlPullParserException("Unexpected start tag: found " + parser.getName() +
                    ", expected " + firstElementName);
        }
private voidbindApplications()
Creates a new appplications adapter for the grid view and registers it.

        if (mGrid == null) {
            mGrid = (GridView) findViewById(R.id.all_apps);
        }
        mGrid.setAdapter(new ApplicationsAdapter(this, mApplications));
        mGrid.setSelection(0);

        if (mApplicationsStack == null) {
            mApplicationsStack = (ApplicationsStackLayout) findViewById(R.id.faves_and_recents);
        }
private voidbindButtons()
Binds actions to the various buttons.

        mShowApplications = findViewById(R.id.show_all_apps);
        mShowApplications.setOnClickListener(new ShowApplications());
        mShowApplicationsCheck = (CheckBox) findViewById(R.id.show_all_apps_check);

        mGrid.setOnItemClickListener(new ApplicationLauncher());
private voidbindFavorites(boolean isLaunching)
Refreshes the favorite applications stacked over the all apps button. The number of favorites depends on the user.

        if (!isLaunching || mFavorites == null) {

            if (mFavorites == null) {
                mFavorites = new LinkedList<ApplicationInfo>();
            } else {
                mFavorites.clear();
            }
            mApplicationsStack.setFavorites(mFavorites);            
            
            FileReader favReader;

            // Environment.getRootDirectory() is a fancy way of saying ANDROID_ROOT or "/system".
            final File favFile = new File(Environment.getRootDirectory(), DEFAULT_FAVORITES_PATH);
            try {
                favReader = new FileReader(favFile);
            } catch (FileNotFoundException e) {
                Log.e(LOG_TAG, "Couldn't find or open favorites file " + favFile);
                return;
            }

            final Intent intent = new Intent(Intent.ACTION_MAIN, null);
            intent.addCategory(Intent.CATEGORY_LAUNCHER);

            final PackageManager packageManager = getPackageManager();

            try {
                final XmlPullParser parser = Xml.newPullParser();
                parser.setInput(favReader);

                beginDocument(parser, TAG_FAVORITES);

                ApplicationInfo info;

                while (true) {
                    nextElement(parser);

                    String name = parser.getName();
                    if (!TAG_FAVORITE.equals(name)) {
                        break;
                    }

                    final String favoritePackage = parser.getAttributeValue(null, TAG_PACKAGE);
                    final String favoriteClass = parser.getAttributeValue(null, TAG_CLASS);

                    final ComponentName cn = new ComponentName(favoritePackage, favoriteClass);
                    intent.setComponent(cn);
                    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

                    info = getApplicationInfo(packageManager, intent);
                    if (info != null) {
                        info.intent = intent;
                        mFavorites.addFirst(info);
                    }
                }
            } catch (XmlPullParserException e) {
                Log.w(LOG_TAG, "Got exception parsing favorites.", e);
            } catch (IOException e) {
                Log.w(LOG_TAG, "Got exception parsing favorites.", e);
            }
        }

        mApplicationsStack.setFavorites(mFavorites);
private voidbindRecents()
Refreshes the recently launched applications stacked over the favorites. The number of recents depends on how many favorites are present.

        final PackageManager manager = getPackageManager();
        final ActivityManager tasksManager = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
        final List<ActivityManager.RecentTaskInfo> recentTasks = tasksManager.getRecentTasks(
                MAX_RECENT_TASKS, 0);

        final int count = recentTasks.size();
        final ArrayList<ApplicationInfo> recents = new ArrayList<ApplicationInfo>();

        for (int i = count - 1; i >= 0; i--) {
            final Intent intent = recentTasks.get(i).baseIntent;

            if (Intent.ACTION_MAIN.equals(intent.getAction()) &&
                    !intent.hasCategory(Intent.CATEGORY_HOME)) {

                ApplicationInfo info = getApplicationInfo(manager, intent);
                if (info != null) {
                    info.intent = intent;
                    if (!mFavorites.contains(info)) {
                        recents.add(info);
                    }
                }
            }
        }

        mApplicationsStack.setRecents(recents);
public booleandispatchKeyEvent(android.view.KeyEvent event)

        if (event.getAction() == KeyEvent.ACTION_DOWN) {
            switch (event.getKeyCode()) {
                case KeyEvent.KEYCODE_BACK:
                    return true;
                case KeyEvent.KEYCODE_HOME:
                    return true;
            }
        }

        return super.dispatchKeyEvent(event);
private static ApplicationInfogetApplicationInfo(android.content.pm.PackageManager manager, android.content.Intent intent)

        final ResolveInfo resolveInfo = manager.resolveActivity(intent, 0);

        if (resolveInfo == null) {
            return null;
        }

        final ApplicationInfo info = new ApplicationInfo();
        final ActivityInfo activityInfo = resolveInfo.activityInfo;
        info.icon = activityInfo.loadIcon(manager);
        if (info.title == null || info.title.length() == 0) {
            info.title = activityInfo.loadLabel(manager);
        }
        if (info.title == null) {
            info.title = "";
        }
        return info;
private voidhideApplications()
Hides all of the applications by playing an animation on the grid.

        if (mBlockAnimation) {
            return;
        }
        mBlockAnimation = true;

        mShowApplicationsCheck.toggle();

        if (mHideLayoutAnimation == null) {
            mHideLayoutAnimation = AnimationUtils.loadLayoutAnimation(
                    this, R.anim.hide_applications);
        }

        mGridExit.setAnimationListener(new HideGrid());
        mGrid.startAnimation(mGridExit);
        mGrid.setVisibility(View.INVISIBLE);
        mShowApplications.requestFocus();

        // This enables a layout animation; if you uncomment this code, you need to
        // comment the line mGrid.startAnimation() above
//        mGrid.setLayoutAnimationListener(new HideGrid());
//        mGrid.setLayoutAnimation(mHideLayoutAnimation);
//        mGrid.startLayoutAnimation();
private voidloadApplications(boolean isLaunching)
Loads the list of installed applications in mApplications.

        if (isLaunching && mApplications != null) {
            return;
        }

        PackageManager manager = getPackageManager();

        Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);
        mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);

        final List<ResolveInfo> apps = manager.queryIntentActivities(mainIntent, 0);
        Collections.sort(apps, new ResolveInfo.DisplayNameComparator(manager));

        if (apps != null) {
            final int count = apps.size();

            if (mApplications == null) {
                mApplications = new ArrayList<ApplicationInfo>(count);
            }
            mApplications.clear();

            for (int i = 0; i < count; i++) {
                ApplicationInfo application = new ApplicationInfo();
                ResolveInfo info = apps.get(i);

                application.title = info.loadLabel(manager);
                application.setActivity(new ComponentName(
                        info.activityInfo.applicationInfo.packageName,
                        info.activityInfo.name),
                        Intent.FLAG_ACTIVITY_NEW_TASK
                        | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);
                application.icon = info.activityInfo.loadIcon(manager);

                mApplications.add(application);
            }
        }
private static voidnextElement(org.xmlpull.v1.XmlPullParser parser)

        int type;
        while ((type = parser.next()) != XmlPullParser.START_TAG &&
                type != XmlPullParser.END_DOCUMENT) {
            // Empty
        }
public voidonCreate(android.os.Bundle icicle)

    
    
        
        super.onCreate(icicle);

        setDefaultKeyMode(DEFAULT_KEYS_SEARCH_LOCAL);

        setContentView(R.layout.home);

        registerIntentReceivers();

        setDefaultWallpaper();

        loadApplications(true);

        bindApplications();
        bindFavorites(true);
        bindRecents();
        bindButtons();

        mGridEntry = AnimationUtils.loadAnimation(this, R.anim.grid_entry);
        mGridExit = AnimationUtils.loadAnimation(this, R.anim.grid_exit);
public booleanonCreateOptionsMenu(android.view.Menu menu)

        super.onCreateOptionsMenu(menu);

        menu.add(0, MENU_WALLPAPER_SETTINGS, 0, R.string.menu_wallpaper)
                 .setIcon(android.R.drawable.ic_menu_gallery)
                 .setAlphabeticShortcut('W");
        menu.add(0, MENU_SEARCH, 0, R.string.menu_search)
                .setIcon(android.R.drawable.ic_search_category_default)
                .setAlphabeticShortcut(SearchManager.MENU_KEY);
        menu.add(0, MENU_SETTINGS, 0, R.string.menu_settings)
                .setIcon(android.R.drawable.ic_menu_preferences)
                .setIntent(new Intent(android.provider.Settings.ACTION_SETTINGS));

        return true;
public voidonDestroy()

        super.onDestroy();

        // Remove the callback for the cached drawables or we leak
        // the previous Home screen on orientation change
        final int count = mApplications.size();
        for (int i = 0; i < count; i++) {
            mApplications.get(i).icon.setCallback(null);
        }

        unregisterReceiver(mWallpaperReceiver);
        unregisterReceiver(mApplicationsReceiver);
protected voidonNewIntent(android.content.Intent intent)

        super.onNewIntent(intent);

        // Close the menu
        if (Intent.ACTION_MAIN.equals(intent.getAction())) {
            getWindow().closeAllPanels();
        }
public booleanonOptionsItemSelected(android.view.MenuItem item)

        switch (item.getItemId()) {
            case MENU_WALLPAPER_SETTINGS:
                startWallpaper();
                return true;
            case MENU_SEARCH:
                onSearchRequested();
                return true;
        }

        return super.onOptionsItemSelected(item);
protected voidonRestoreInstanceState(android.os.Bundle state)

        super.onRestoreInstanceState(state);
        final boolean opened = state.getBoolean(KEY_SAVE_GRID_OPENED, false);
        if (opened) {
            showApplications(false);
        }
protected voidonResume()

        super.onResume();
        bindRecents();
protected voidonSaveInstanceState(android.os.Bundle outState)

        super.onSaveInstanceState(outState);
        outState.putBoolean(KEY_SAVE_GRID_OPENED, mGrid.getVisibility() == View.VISIBLE);
private voidregisterIntentReceivers()
Registers various intent receivers. The current implementation registers only a wallpaper intent receiver to let other applications change the wallpaper.

        IntentFilter filter = new IntentFilter(Intent.ACTION_WALLPAPER_CHANGED);
        registerReceiver(mWallpaperReceiver, filter);

        filter = new IntentFilter(Intent.ACTION_PACKAGE_ADDED);
        filter.addAction(Intent.ACTION_PACKAGE_REMOVED);
        filter.addAction(Intent.ACTION_PACKAGE_CHANGED);
        filter.addDataScheme("package");
        registerReceiver(mApplicationsReceiver, filter);
private voidsetDefaultWallpaper()
When no wallpaper was manually set, a default wallpaper is used instead.

        if (!mWallpaperChecked) {
            Drawable wallpaper = peekWallpaper();
            if (wallpaper == null) {
                try {
                    clearWallpaper();
                } catch (IOException e) {
                    Log.e(LOG_TAG, "Failed to clear wallpaper " + e);
                }
            } else {
                getWindow().setBackgroundDrawable(new ClippedDrawable(wallpaper));
            }
            mWallpaperChecked = true;
        }
private voidshowApplications(boolean animate)
Shows all of the applications by playing an animation on the grid.

        if (mBlockAnimation) {
            return;
        }
        mBlockAnimation = true;

        mShowApplicationsCheck.toggle();

        if (mShowLayoutAnimation == null) {
            mShowLayoutAnimation = AnimationUtils.loadLayoutAnimation(
                    this, R.anim.show_applications);
        }

        // This enables a layout animation; if you uncomment this code, you need to
        // comment the line mGrid.startAnimation() below
//        mGrid.setLayoutAnimationListener(new ShowGrid());
//        mGrid.setLayoutAnimation(mShowLayoutAnimation);
//        mGrid.startLayoutAnimation();

        if (animate) {
            mGridEntry.setAnimationListener(new ShowGrid());
            mGrid.startAnimation(mGridEntry);
        }

        mGrid.setVisibility(View.VISIBLE);

        if (!animate) {
            mBlockAnimation = false;
        }

        // ViewDebug.startHierarchyTracing("Home", mGrid);
private voidstartWallpaper()

        final Intent pickWallpaper = new Intent(Intent.ACTION_SET_WALLPAPER);
        startActivity(Intent.createChooser(pickWallpaper, getString(R.string.menu_wallpaper)));