Android使用MediaPlayer和TextureView实现视频无缝切换

需求描述

比如广告播放，每个视频15秒，视频之间切换的时候，性能不太好的机器可能会黑屏一段时间，体验不太好，接下来我们就是要解决这个黑屏问题。

解决方案

使用两个surfaceView方式，经过测试不行
使用一个MediaPlayer，在MediaPlayer上面加一层ImageView，每次播放完成后，获取视频的最后一帧的图像给ImageView，视频切换完成，ImageView隐藏，如此往复循环，可行

实践

1.获取视频流图片方式，通过MediaMetadataRetriever，测试发现，部分机器获取的Bitmap可能为空，无法解决，放弃

2.使用TextureView方式，可以获取当前帧的Bitmap，可行，下面贴代码

package com.winson.blog.video;

import android.graphics.Bitmap;
import android.graphics.SurfaceTexture;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.Surface;
import android.view.TextureView;
import android.view.View;
import android.view.ViewGroup;
import android.widget.FrameLayout;
import android.widget.ImageView;

import java.io.IOException;

public class VideoFragment extends Fragment {

 public static final String TAG = VideoFragment.class.getSimpleName();

 String TEST_PATH = Environment.getExternalStorageDirectory().getAbsolutePath() + "/testmp4.mp4";
 int mIndex = 0;
 String path1 = TEST_PATH;
 String[] paths = new String[]{TEST_PATH,TEST_PATH,TEST_PATH};

 boolean destory;
 Handler mHandler;
 Runnable mPlayRun;
 FrameLayout content;
 TextureView textureView;
 ImageView frameImage;
 MediaPlayer mediaPlayer;
 Bitmap lastFrameBitmap;

 public void updateResources(String[] paths) {
 this.paths = paths;
 if(mHandler != null && mPlayRun!= null){
  mHandler.post(mPlayRun);
 }
 }

 @Override
 public void onCreate(@Nullable Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);

 mHandler = new Handler();
 mediaPlayer = new MediaPlayer();
 mPlayRun = new Runnable() {

  @Override
  public void run() {

  if (mediaPlayer == null || destory) {
   return;

  }
  mediaPlayer.pause();
  mediaPlayer.reset();

  try {
   String path = paths[mIndex % paths.length];
   mIndex++;

   mediaPlayer.setDataSource(getActivity(),Uri.parse(path));
   mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {

   @Override
   public void onPrepared(MediaPlayer arg0) {
    mediaPlayer.start();
    frameImage.setVisibility(View.GONE);
   }
   });
   mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
   @Override
   public void onCompletion(MediaPlayer mp) {
    frameImage.setVisibility(View.VISIBLE);
    Bitmap currentFrameBitmap = textureView.getBitmap();
    frameImage.setImageBitmap(currentFrameBitmap);
    if (lastFrameBitmap != null) {
    lastFrameBitmap.recycle();
    }
    lastFrameBitmap = currentFrameBitmap;

    mHandler.post(mPlayRun);
   }
   });
   mediaPlayer.prepareAsync();

  } catch (Exception e) {
   e.printStackTrace();
  }
  }

 };
 }

 public void release() {
 mHandler.removeCallbacks(mPlayRun);
 if (mediaPlayer != null) {
  mediaPlayer.pause();
  mediaPlayer.release();
 }
 }

 public Bitmap getBitmap() {
 return textureView == null ? null : textureView.getBitmap();
 }

 @Override
 public void onDestroy() {
 super.onDestroy();
 release();
 }

 @Nullable
 @Override
 public View onCreateView(LayoutInflater inflater,@Nullable ViewGroup container,@Nullable Bundle savedInstanceState) {
 content = new FrameLayout(getActivity());

 FrameLayout.LayoutParams lp = new FrameLayout.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT,FrameLayout.LayoutParams.MATCH_PARENT);
 lp.gravity = Gravity.LEFT | Gravity.TOP;

 textureView = new TextureView(getActivity());
 textureView.setLayoutParams(lp);
 content.addView(textureView);

 frameImage = new ImageView(getActivity());
 frameImage.setScaleType(ImageView.ScaleType.FIT_XY);
 frameImage.setLayoutParams(lp);
 content.addView(frameImage);

 textureView.setSurfaceTextureListener(new TextureView.SurfaceTextureListener() {
  @Override
  public void onSurfaceTextureAvailable(SurfaceTexture surface,int width,int height) {
  Surface s = new Surface(surface);
  mediaPlayer.setSurface(s);

  }

  @Override
  public void onSurfaceTextureSizeChanged(SurfaceTexture surface,int height) {
  }

  @Override
  public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
  return false;
  }

  @Override
  public void onSurfaceTextureUpdated(SurfaceTexture surface) {
  }
 });

 return content;
 }

 @Override
 public void onActivityCreated(@Nullable Bundle savedInstanceState) {
 super.onActivityCreated(savedInstanceState);

 testPlay();
 }

 public void testPlay() {
// mediaPlayer.pause();
// mediaPlayer.reset();
//
// try {
//  mediaPlayer.setDataSource(getActivity(),Uri.parse(TEST_PATH));
//  mediaPlayer.prepare();
//  mediaPlayer.start();
// } catch (IOException e) {
//  e.printStackTrace();
// }

 mHandler.post(mPlayRun);
 }

}

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