我是安卓新手。
我的动画代码在 android 2.2 中运行良好，但在 android 2.3 中无法运行，当我在 android 2.3 中运行动画代码时，其显示错误如下：
java.lang.RuntimeException: Canvas: trying to use a recycled bitmap
android.graphics.Bitmap@405795e8
在我的活动中，我有三个按钮和一个图像视图，其中我单击图像视图正在播放一个动画但是当我第一次使用 ball_but 按钮时它会播放一些动画到现在它工作正常但是当我再次单击 ball_but 时在 log cat 中给出这样的强制关闭错误。
我对此一无所知。
我的动画 xml 文件：
<?xml version="1.0" encoding="utf-8"?>
<animation-list xmlns:android="http://schemas.android.com/apk/res/android"
android:oneshot="true" >
<item
android:drawable="@drawable/cap_animation01"
android:duration="100"/>
<item
android:drawable="@drawable/cap_animation02"
android:duration="100"/>
<item
android:drawable="@drawable/cap_animation03"
android:duration="100"/>
<item
android:drawable="@drawable/cap_animation04"
android:duration="100"/>
<item
android:drawable="@drawable/cap_animation05"
android:duration="100"/>
<item
android:drawable="@drawable/cap_animation01"
android:duration="100"/>
<item
android:drawable="@drawable/cap_animation02"
android:duration="100"/>
<item
android:drawable="@drawable/cap_animation03"
android:duration="100"/>
<item
android:drawable="@drawable/cap_animation04"
android:duration="100"/>
<item
android:drawable="@drawable/cap_animation05"
android:duration="100"/>
<item
android:drawable="@drawable/cap_animation01"
android:duration="100"/>
<item
android:drawable="@drawable/cap_animation02"
android:duration="100"/>
<item
android:drawable="@drawable/cap_animation03"
android:duration="100"/>
<item
android:drawable="@drawable/cap_animation04"
android:duration="100"/>
<item
android:drawable="@drawable/cap_animation05"
android:duration="100"/>
<item
android:drawable="@drawable/cap_animation01"
android:duration="100"/>
<item
android:drawable="@drawable/cap_animation02"
android:duration="100"/>
<item
android:drawable="@drawable/cap_animation03"
android:duration="100"/>
<item
android:drawable="@drawable/cap_animation04"
android:duration="100"/>
<item
android:drawable="@drawable/cap_animation05"
android:duration="100"/>
<item
android:drawable="@drawable/elephant_first"
android:duration="100"/>
</animation-list>
我的活动：
public class Home extends Activity implements OnClickListener {
Button ball_but,drum_but,hat_but,freeapps_but,moreapps_but,start_but;
MediaPlayer mp;
int flag = 0;
ImageView elepahant_img;
private static Boolean isSoundPlaying=false;
static SelectTalkTask mytask;
AnimationDrawable drawable=null;
AnimationDrawable drawable_one=null;
AnimationDrawable drawable_two=null;
public void onCreate(Bundle savedInstanceState) {
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
super.onCreate(savedInstanceState);
setContentView(R.layout.talking_elephant_home);
elepahant_img=(ImageView)findViewById(R.id.elephant_img);
elepahant_img.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
isSoundPlaying = true;
release(drawable);
AnimationDrawable drawable = (AnimationDrawable) getResources().getDrawable(R.layout.water);
ImageView im = (ImageView) findViewById(R.id.elephant_img);
im.setBackgroundDrawable(drawable);
im.post(drawable);
play_water(); ///play the water
checkIfAnimationDone(drawable);
}
private void play_water() {
if(mp!=null){
mp.reset();
mp.release();
}
mp = MediaPlayer.create(Home.this,R.raw.water);
mp.start();
}
});
drum_but=(Button)findViewById(R.id.drum_but);
drum_but.setOnClickListener(this);
hat_but=(Button)findViewById(R.id.cap_but);
hat_but.setOnClickListener(this);
ball_but=(Button)findViewById(R.id.ball_but);
ball_but.setOnClickListener(this);
}
public void onClick(View v) {
switch (v.getId()) {
case R.id.ball_but:
release(drawable);
Log.i("TAG", "this is ball_but"+isSoundPlaying);
drawable = (AnimationDrawable) getResources().getDrawable(R.layout.elephant);
elepahant_img = (ImageView) findViewById(R.id.elephant_img);
elepahant_img.setBackgroundDrawable(drawable);
elepahant_img.post(drawable);
play();
checkIfAnimationDone(drawable);
break;
case R.id.drum_but:
isSoundPlaying = true;
release(drawable);
Log.i("TAG", "this is cap_but"+isSoundPlaying);
drawable = (AnimationDrawable) getResources().getDrawable(R.layout.drum);
elepahant_img = (ImageView) findViewById(R.id.elephant_img);
elepahant_img.setBackgroundDrawable(drawable);
elepahant_img.post(drawable);
play_one();
checkIfAnimationDone(drawable);
break;
case R.id.cap_but:
isSoundPlaying = true;
release(drawable);
Log.i("TAG", "this is cap_but"+isSoundPlaying);
drawable = (AnimationDrawable) getResources().getDrawable(R.layout.cap);
elepahant_img = (ImageView) findViewById(R.id.elephant_img);
elepahant_img.setBackgroundDrawable(drawable);
elepahant_img.post(drawable);
play_two();
checkIfAnimationDone(drawable);
break;
}
}
protected void play() {
if(mp!=null){
mp.reset();
mp.release();
}
mp = MediaPlayer.create(Home.this,R.raw.ball);
mp.start();
}
private void play_two() {
if(mp!=null){
mp.reset();
mp.release();
}
mp = MediaPlayer.create(Home.this,R.raw.cap);
mp.start();
}
private void play_one() {
if(mp!=null){
mp.reset();
mp.release();
}
mp = MediaPlayer.create(Home.this,R.raw.drums);
mp.start();
}
protected void onPause() {
super.onPause();
try{
mp.stop();
}catch (NullPointerException e) {
e.printStackTrace();
}
}
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
this.finish();
System.exit(0);
return true;
}
return super.onKeyDown(keyCode, event);
}
public void onDestroy() {
super.onDestroy();
System.out.println("OnDestroy");
System.gc();
Runtime.getRuntime().gc();
*/
elepahant_img = (ImageView)findViewById(R.id.elephant_img);
if (elepahant_img != null)
{
((BitmapDrawable)elepahant_img.getDrawable()).getBitmap().recycle();
elepahant_img.setImageDrawable(null);
}
System.gc();
}
public void release(AnimationDrawable ad){
if(ad==null)
return;
ad.stop();
for (int i = 0; i < ad.getNumberOfFrames(); ++i){
Drawable frame = ad.getFrame(i);
if (frame instanceof BitmapDrawable) {
((BitmapDrawable)frame).getBitmap().recycle();
}
frame.setCallback(null);
frame=null;
}
ad.setCallback(null);
ad=null;
}
}