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 path2 = TEST_PATH;  String[] paths = new String[]{TEST_PATH, TEST_PATH, TEST_PATH, 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 width, 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);  }  }