am 61141565: Merge "Clear widget preview cache when system is updated" into jb-ub-now-jetsonic

import android.content.ComponentName;

import android.content.ContentValues;

import android.content.Context;

import android.content.SharedPreferences;

import android.content.pm.PackageManager;

import android.content.pm.ResolveInfo;

import android.content.res.Resources;

public class WidgetPreviewLoader {

    static final String TAG = "WidgetPreviewLoader";

    static final String ANDROID_INCREMENTAL_VERSION_NAME_KEY = "android.incremental.version";

    private int mPreviewBitmapWidth;

    private int mPreviewBitmapHeight;

        mDb = app.getWidgetPreviewCacheDb();

        mLoadedPreviews = new HashMap<String, WeakReference<Bitmap>>();

        mUnusedBitmaps = new ArrayList<SoftReference<Bitmap>>();

        SharedPreferences sp = context.getSharedPreferences(

                LauncherAppState.getSharedPreferencesKey(), Context.MODE_PRIVATE);

        final String lastVersionName = sp.getString(ANDROID_INCREMENTAL_VERSION_NAME_KEY, null);

        final String versionName = android.os.Build.VERSION.INCREMENTAL;

        if (!versionName.equals(lastVersionName)) {

            // clear all the previews whenever the system version changes, to ensure that previews

            // are up-to-date for any apps that might have been updated with the system

            clearDb();

            SharedPreferences.Editor editor = sp.edit();

            editor.putString(ANDROID_INCREMENTAL_VERSION_NAME_KEY, versionName);

            editor.commit();

        }

    }

    public void setPreviewSize(int previewWidth, int previewHeight,

        db.insert(CacheDb.TABLE_NAME, null, values);

    }

    private void clearDb() {

        SQLiteDatabase db = mDb.getWritableDatabase();

        // Delete everything

        db.delete(CacheDb.TABLE_NAME, null, null);

    }

    public static void removePackageFromDb(final CacheDb cacheDb, final String packageName) {

        synchronized(sInvalidPackages) {

            sInvalidPackages.add(packageName);