最近在做一个Android视频播放器，遇到一个问题：切换到下一个视频时，中间会停留上一个视频的残存画面。

 

这是怎么回事？

 

我在网上找了很多资料，终于找到了原因：我是用自定义一个surfaceview来显示画面的，切换视频时并没有将surfaceview显示的

内容做处理。

 

怎么解决？

 

知道原因，那就很好解决了。

 

首先，视频切换时，不再显示视频，及播放器不显示视频内容。

我找到了我代码中的这个方法：mVideoView.setRender(0);

public void setRender(int render) {
switch (render) {
case RENDER_NONE:
setRenderView(null);
break;
case RENDER_TEXTURE_VIEW: {
TextureRenderView renderView = new TextureRenderView(getContext());
if (mMediaPlayer != null) {
renderView.getSurfaceHolder().bindToMediaPlayer(mMediaPlayer);
renderView.setVideoSize(mMediaPlayer.getVideoWidth(),
mMediaPlayer.getVideoHeight());
renderView.setVideoSampleAspectRatio(
mMediaPlayer.getVideoSarNum(),
mMediaPlayer.getVideoSarDen());
renderView.setAspectRatio(mCurrentAspectRatio);
}
setRenderView(renderView);
break;
}
case RENDER_SURFACE_VIEW: {
SurfaceRenderView renderView = new SurfaceRenderView(getContext());
setRenderView(renderView);
break;
}
default:
Log.e(TAG, String.format(Locale.getDefault(),
"invalid render %d\n", render));
break;
}
}

public void setRenderView(IRenderView renderView) {
if (mRenderView != null) {
if (mMediaPlayer != null)
mMediaPlayer.setDisplay(null);

View renderUIView = mRenderView.getView();
mRenderView.removeRenderCallback(mSHCallback);
mRenderView = null;
removeView(renderUIView);
}

if (renderView == null)
return;

mRenderView = renderView;
renderView.setAspectRatio(mCurrentAspectRatio);
if (mVideoWidth > 0 && mVideoHeight > 0)
renderView.setVideoSize(mVideoWidth, mVideoHeight);
if (mVideoSarNum > 0 && mVideoSarDen > 0)
renderView.setVideoSampleAspectRatio(mVideoSarNum, mVideoSarDen);

View renderUIView = mRenderView.getView();
FrameLayout.LayoutParams lp = new FrameLayout.LayoutParams(
FrameLayout.LayoutParams.WRAP_CONTENT,
FrameLayout.LayoutParams.WRAP_CONTENT, Gravity.CENTER);
renderUIView.setLayoutParams(lp);
addView(renderUIView);

mRenderView.addRenderCallback(mSHCallback);
mRenderView.setVideoRotation(mVideoRotationDegree);
}

然后，视频准备好后，再显示视频：initRenders()；

public void initRenders() {
mAllRenders.clear();

if (mSettings.getEnableSurfaceView())
mAllRenders.add(RENDER_SURFACE_VIEW);
if (mSettings.getEnableTextureView()
&& Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH)
mAllRenders.add(RENDER_TEXTURE_VIEW);
if (mSettings.getEnableNoView())
mAllRenders.add(RENDER_NONE);

if (mAllRenders.isEmpty())
mAllRenders.add(RENDER_SURFACE_VIEW);
mCurrentRender = mAllRenders.get(mCurrentRenderIndex);
setRender(mCurrentRender);
}

根据这个逻辑，解决这一问题。