Here you can find the source of getDensityOptimizedIconSizeDrawable( final Context myAppContext, final Context targetPackageContext, final int resId)
@TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH_MR1) public static Drawable getDensityOptimizedIconSizeDrawable( final Context myAppContext, final Context targetPackageContext, final int resId)
/*/*from w w w . j av a 2 s .c o m*/ * Copyright 2014 Soichiro Kashima * * 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. */ import android.annotation.TargetApi; import android.app.ActivityManager; import android.content.Context; import android.content.res.Resources; import android.graphics.Bitmap; import android.graphics.drawable.BitmapDrawable; import android.graphics.drawable.Drawable; import android.os.Build; import android.util.DisplayMetrics; import android.view.Display; import android.view.WindowManager; public class Main{ @TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH_MR1) public static Drawable getDensityOptimizedIconSizeDrawable( final Context myAppContext, final Context targetPackageContext, final int resId) { int adjustedResId = resId; if (adjustedResId <= 0) { adjustedResId = android.R.drawable.sym_def_app_icon; } int density; if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) { density = ((ActivityManager) myAppContext .getSystemService(Context.ACTIVITY_SERVICE)) .getLauncherLargeIconDensity(); } else { Display display = ((WindowManager) myAppContext .getSystemService(Context.WINDOW_SERVICE)) .getDefaultDisplay(); DisplayMetrics metrics = new DisplayMetrics(); display.getMetrics(metrics); density = metrics.densityDpi; } Drawable d; if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH_MR1) { try { d = targetPackageContext.getResources() .getDrawableForDensity(adjustedResId, density); } catch (Resources.NotFoundException e) { return null; } } else { d = targetPackageContext.getResources().getDrawable( adjustedResId); } // ???????????????????????????? int iconSize = BitmapUtils .getDensityOptimizedIconSize(myAppContext); if (d instanceof BitmapDrawable && (iconSize < d.getIntrinsicWidth() || iconSize < d .getIntrinsicHeight())) { Bitmap bitmap = Bitmap.createScaledBitmap( ((BitmapDrawable) d).getBitmap(), iconSize, iconSize, true); d = new BitmapDrawable(myAppContext.getResources(), bitmap); } return d; } @TargetApi(Build.VERSION_CODES.HONEYCOMB) public static int getDensityOptimizedIconSize(final Context context) { int iconSize; if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH_MR1) { iconSize = ((ActivityManager) context .getSystemService(Context.ACTIVITY_SERVICE)) .getLauncherLargeIconSize(); } else { iconSize = (int) context.getResources().getDimension( android.R.dimen.app_icon_size); } return iconSize; } }