| /* |
| * Copyright (C) 2009 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.example.android.apis.graphics; |
| |
| import android.app.AlertDialog; |
| import android.content.DialogInterface; |
| import android.content.pm.ActivityInfo; |
| import android.content.pm.PackageManager; |
| import android.content.pm.PackageManager.NameNotFoundException; |
| import android.os.Bundle; |
| import android.os.Handler; |
| import android.os.Message; |
| |
| /** |
| * PurgeableBitmap demonstrates the effects of setting Bitmaps as being |
| * purgeable. |
| * |
| * In the NonPurgeable case, an encoded bitstream is decoded to a different |
| * Bitmap over and over again up to 200 times until out-of-memory occurs. |
| * In contrast, the Purgeable case shows that the system can complete decoding |
| * the encoded bitstream 200 times without hitting the out-of-memory case. |
| */ |
| public class PurgeableBitmap extends GraphicsActivity { |
| |
| private PurgeableBitmapView mView; |
| private final RefreshHandler mRedrawHandler = new RefreshHandler(); |
| |
| class RefreshHandler extends Handler { |
| |
| @Override |
| public void handleMessage(Message msg) { |
| int index = mView.update(this); |
| if (index > 0) { |
| showAlertDialog(getDialogMessage(true, index)); |
| } else if (index < 0){ |
| mView.invalidate(); |
| showAlertDialog(getDialogMessage(false, -index)); |
| } else { |
| mView.invalidate(); |
| } |
| } |
| |
| public void sleep(long delayMillis) { |
| this.removeMessages(0); |
| sendMessageDelayed(obtainMessage(0), delayMillis); |
| } |
| } |
| |
| @Override |
| protected void onCreate(Bundle savedInstanceState) { |
| super.onCreate(savedInstanceState); |
| mView = new PurgeableBitmapView(this, detectIfPurgeableRequest()); |
| mRedrawHandler.sleep(0); |
| setContentView(mView); |
| } |
| |
| private boolean detectIfPurgeableRequest() { |
| PackageManager pm = getPackageManager(); |
| CharSequence labelSeq = null; |
| try { |
| ActivityInfo info = pm.getActivityInfo(this.getComponentName(), |
| PackageManager.GET_META_DATA); |
| labelSeq = info.loadLabel(pm); |
| } catch (NameNotFoundException e) { |
| e.printStackTrace(); |
| return false; |
| } |
| |
| String[] components = labelSeq.toString().split("/"); |
| if (components[components.length - 1].equals("Purgeable")) { |
| return true; |
| } else { |
| return false; |
| } |
| } |
| |
| private String getDialogMessage(boolean isOutOfMemory, int index) { |
| StringBuilder sb = new StringBuilder(); |
| if (isOutOfMemory) { |
| sb.append("Out of memery occurs when the "); |
| sb.append(index); |
| sb.append("th Bitmap is decoded."); |
| } else { |
| sb.append("Complete decoding ") |
| .append(index) |
| .append(" bitmaps without running out of memory."); |
| } |
| return sb.toString(); |
| } |
| |
| private void showAlertDialog(String message) { |
| AlertDialog.Builder builder = new AlertDialog.Builder(this); |
| builder.setMessage(message) |
| .setCancelable(false) |
| .setPositiveButton("Yes", new DialogInterface.OnClickListener() { |
| public void onClick(DialogInterface dialog, int id) { |
| } |
| }); |
| AlertDialog alert = builder.create(); |
| alert.show(); |
| } |
| |
| |
| } |