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/*
* 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();
}
}
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