Android SurfaceView IllegalArgumentException lockCanvas
Android SurfaceView IllegalArgumentException lockCanvas
提问于 2015-12-16 09:19:30
我正在制作一段SurfaceView视频。我的目标是获得运行视频的反复位图。以下是我的自定义实现：
private static final String TAG = "XXX";
private Activity activity;
private SurfaceHolder mSurface;
private MediaPlayer mMediaPlayer;
private SurfaceHolder mActiveSurface;
public ImageView imageView;
boolean locked, locked1;
private boolean isCreated;
public AlphaSurfaceView(Context context,Activity activity) {
super(context);
getHolder().addCallback(this);
setWillNotDraw(false);
this.activity = activity;
}
public AlphaSurfaceView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public AlphaSurfaceView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
@Override
public void draw(Canvas canvas) {
super.draw(canvas);
}
@Override
public void onDraw(Canvas canvas) {
//super.onDraw(canvas);
if(isCreated){
if(getHolder() != null && getHolder().getSurface().isValid()){
Canvas c = null;
try {
if(!locked){
try {
c = getHolder().lockCanvas();
locked = true;
}catch (IllegalArgumentException e){
e.printStackTrace();
locked = false;
}
BitmapDrawable bdrawable = new BitmapDrawable();
bdrawable.draw(c);
}
}catch (Exception e){
e.printStackTrace();
locked = false;
}finally {
if(c != null && locked){
getHolder().unlockCanvasAndPost(c);
locked = false;
}
}
}
}else{
super.onDraw(canvas);
}
invalidate();
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
mSurface = holder;
mMediaPlayer = MediaPlayer.create(getContext(), Uri.parse("XX"), mSurface);
mActiveSurface = mSurface;
try {
mMediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mp) {
mMediaPlayer.start();
mMediaPlayer.setLooping(true);
}
});
} catch (Exception e) {
e.printStackTrace();
}
this.isCreated = true;
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
Log.d(TAG, "surfacechanged");
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
mMediaPlayer.stop();
}
@Override
protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
mMediaPlayer.stop();
}该问题是由IllegalArgumentException ()方法引起的。
我尝试了许多可能性，比如：
- 添加一些布尔值(锁定和创建曲面视图)
- 检验表面是否有效
- 甚至在Manifest的xml中的目标活动中添加exported="true“
顺便说一下，第一个想法是使用getDrawingCache()，但即使我添加了setCacheEnabled(true)，返回也是空的。
那么，如何解决此异常，还是使用另一种方法获取每个帧？
谢谢!
回答 2
Stack Overflow用户
发布于 2015-12-16 17:45:39
Stack Overflow用户
发布于 2016-01-19 17:09:50
surfaceHolder.addCallback(new SurfaceHolder.Callback() {
@Override
public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {
Log.e("video","surfaceChanged");
}
@Override
public void surfaceCreated(SurfaceHolder arg0) {
Log.e("video","surfaceCreated");
mediaPlayer.setDisplay(surfaceHolder);
}
@Override
public void surfaceDestroyed(SurfaceHolder arg0) {
Log.e("video","surfaceDestroyed");
if (mediaPlayer != null) mediaPlayer.release();
}
});那会有帮助的。让MediaPlayer来完成绘图工作。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/34308060
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