Android使用SurfaceView播放视频，可以自适应尺寸。

需求很简单，就是普通的播放视频，使用android源生的MediaPlayer播放。

下面是完整代码和布局，黑色区域可以自己调整大小。

import android.content.pm.ActivityInfo;import android.media.AudioManager;import android.media.MediaPlayer;import android.net.Uri;import android.os.Bundle;import android.support.annotation.Nullable;import android.support.v7.app.AppCompatActivity;import android.view.SurfaceHolder;import android.view.SurfaceView;import android.view.View;import android.widget.Button;import android.widget.RelativeLayout;import com.XX.XX.R;/** * Created by ZengHongHua on 2018/11/23. */public class TestVideoActivity extends AppCompatActivity implements View.OnClickListener {    private SurfaceView mSurfaceView;    private MediaPlayer mMediaPlayer;    private SurfaceHolder mHolder;    private Button mBtnPlay;    private RelativeLayout mParent;    @Override    protected void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.test_surface_video);        initData();    }    private void initData() {        mBtnPlay = findViewById(R.id.test_btn_play);        mSurfaceView = findViewById(R.id.test_surfaceView);        mParent = findViewById(R.id.test_parent_play);        mBtnPlay.setOnClickListener(this);        mMediaPlayer = new MediaPlayer();        mHolder = mSurfaceView.getHolder();        mHolder.setKeepScreenOn(true);        mHolder.addCallback(new SurfaceHolder.Callback() {            @Override            public void surfaceCreated(SurfaceHolder holder) {                //开始播放                readyPlay();            }            @Override            public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {            }            @Override            public void surfaceDestroyed(SurfaceHolder holder) {            }        });        mMediaPlayer.setOnVideoSizeChangedListener(new MediaPlayer.OnVideoSizeChangedListener() {            @Override            public void onVideoSizeChanged(MediaPlayer mp, int width, int height) {                changeVideoSize();            }        });    }    //改变视频的尺寸自适应。    public void changeVideoSize() {        int videoWidth = mMediaPlayer.getVideoWidth();        int videoHeight = mMediaPlayer.getVideoHeight();        int surfaceWidth = mSurfaceView.getWidth();        int surfaceHeight = mSurfaceView.getHeight();        //根据视频尺寸去计算->视频可以在sufaceView中放大的最大倍数。        float max;        if (getResources().getConfiguration().orientation == ActivityInfo.SCREEN_ORIENTATION_PORTRAIT) {            //竖屏模式下按视频宽度计算放大倍数值            max = Math.max((float) videoWidth / (float) surfaceWidth, (float) videoHeight / (float) surfaceHeight);        } else {            //横屏模式下按视频高度计算放大倍数值            max = Math.max(((float) videoWidth / (float) surfaceHeight), (float) videoHeight / (float) surfaceWidth);        }        //视频宽高分别/最大倍数值 计算出放大后的视频尺寸        videoWidth = (int) Math.ceil((float) videoWidth / max);        videoHeight = (int) Math.ceil((float) videoHeight / max);        //无法直接设置视频尺寸，将计算出的视频尺寸设置到surfaceView 让视频自动填充。        RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(videoWidth, videoHeight);        params.addRule(RelativeLayout.CENTER_VERTICAL, mParent.getId());        mSurfaceView.setLayoutParams(params);    }    //准好播放了    public void readyPlay() {        String url = "http://res.cloudinary.com/liuyuesha/video/upload/v1475978853/广告_bl4dbp.mp4";        mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);        try {            mMediaPlayer.setDataSource(this, Uri.parse(url));        } catch (Exception e) {            e.printStackTrace();        }        mMediaPlayer.setLooping(true);        // 把视频画面输出到SurfaceView        mMediaPlayer.setDisplay(mHolder);        // 通过异步的方式装载媒体资源        mMediaPlayer.prepareAsync();        mMediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {            @Override            public void onPrepared(MediaPlayer mp) {                //装载完毕回调                play();            }        });    }    /**     * 播放或者暂停     */    private void play() {        if (mMediaPlayer != null) {            if (mMediaPlayer.isPlaying()) {                mMediaPlayer.pause();                mBtnPlay.setText("播放");            } else {                mMediaPlayer.start();                mBtnPlay.setText("暂停");            }        }    }    @Override    public void onClick(View v) {        if (v.getId() == R.id.test_btn_play) {            play();        }    }    @Override    protected void onDestroy() {        if (mMediaPlayer != null) {            if (mMediaPlayer.isPlaying()) {                mMediaPlayer.stop();            }            mMediaPlayer.release();            mMediaPlayer = null;        }        super.onDestroy();    }}

布局文件：

<?xml version="1.0" encoding="utf-8"?>

自适应尺寸参考https://blog.csdn.net/u013274497/article/details/79041912

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