经验首页 前端设计 程序设计 Java相关 移动开发 数据库/运维 软件/图像 大数据/云计算 其他经验
当前位置:技术经验 » 移动开发 » Android » 查看文章
Android使用MediaPlayer和TextureView实现视频无缝切换
来源:jb51  时间:2019/10/9 11:29:29  对本文有异议

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, 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);
  }
 
 
}

相关链接,github地址

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持w3xue。