MediaPlayer+SurfaceHolder播放工具类

在公司写了个MediaPlayer+SurfaceHolder工具类，用来播放本地视频，支持seekbar定位播放

特地做个笔记，如果有写的不好的地方，欢迎指出，我会及时改正。

直接上代码：

package com.wirelesscamera.view;import android.app.Activity;import android.content.Context;import android.media.AudioManager;import android.media.MediaPlayer;import android.os.Handler;import android.support.annotation.AttrRes;import android.support.annotation.NonNull;import android.support.annotation.Nullable;import android.text.TextUtils;import android.util.AttributeSet;import android.util.Log;import android.view.SurfaceHolder;import android.view.SurfaceView;import android.view.View;import android.widget.FrameLayout;import android.widget.Toast;import com.securesmart.camera.R;import java.io.IOException;public class IMediaPlayer extends FrameLayout implements        MediaPlayer.OnCompletionListener,        MediaPlayer.OnPreparedListener,        MediaPlayer.OnSeekCompleteListener,        MediaPlayer.OnErrorListener,        MediaPlayer.OnBufferingUpdateListener,        SurfaceHolder.Callback {    private String TAG = "IMediaPlayer";    private Context context;    private Activity activity;    // SurfaceView的创建比较耗时，要注意    private SurfaceHolder surfaceHolder;    private MediaPlayer mediaPlayer;    // 标记暂停和播放状态    private boolean isPlaying = true;    private boolean isFirstPlay = false;    private boolean isPrepare = false;    //地址    private String videoPath;    private int video_position = 0;    private AudioManager audioManager;    // 控件实例化    private SurfaceView player_surfaceView;    private boolean isMute = false;    public IMediaPlayer(@NonNull Context context) {        this(context, null);    }    public IMediaPlayer(@NonNull Context context, @Nullable AttributeSet attrs) {        this(context, attrs, 0);    }    public IMediaPlayer(@NonNull Context context, @Nullable AttributeSet attrs, @AttrRes int defStyleAttr) {        super(context, attrs, defStyleAttr);        this.context = context;        this.activity = (Activity) context;        initView();    }    private void initView() {        View view = View.inflate(context, R.layout.media_player_layout, this);        player_surfaceView = (SurfaceView) view.findViewById(R.id.player_surfaceView);        audioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);        initSurfaceView();    }    private void initSurfaceView() {        surfaceHolder = player_surfaceView.getHolder();        surfaceHolder.addCallback(this);    }    /**     * 播放视频     *     * @param url 视频地址     */    public void playVideo(String url) {        playVideo(url, video_position);    }    private void playVideo(String url, int position) {        if (TextUtils.isEmpty(url)) {            Toast.makeText(context, context.getString(R.string.playback_file_not_exist), Toast.LENGTH_SHORT).show();            return;        }        videoPath = url;        video_position = position;        isPrepare = false;        isPlaying = true;        resetMediaplayer();    }    /**     * 设置视频信息     *     * @param url 视频地址     */    public void setDataSource(String url) {        //赋值        videoPath = url;    }    public boolean isPlaying() {        return mediaPlayer != null && mediaPlayer.isPlaying();    }    // 播放视频    public void startVideo() {        if (mediaPlayer != null) {            mediaPlayer.start();            isPlaying = true;        }    }    /**     * 暂停视频     */    public void pauseVideo() {        if (mediaPlayer != null) {            mediaPlayer.pause();            video_position = mediaPlayer.getCurrentPosition();            isPlaying = false;        }    }    private void resetMediaplayer() {        try {            if (mediaPlayer != null) {                if (mediaPlayer.isPlaying()) {                    mediaPlayer.pause();                    mediaPlayer.stop();                }                mediaPlayer.reset();                mediaPlayer.setDataSource(videoPath);                if (isMute) {                    mediaPlayer.setVolume(0f, 0f);                } else {                    if (mediaPlayer != null) {                        mediaPlayer.setVolume(1f, 1f);                    }                }                // 准备开始,异步准备，自动在子线程中                mediaPlayer.prepareAsync();                //视频缩放模式                mediaPlayer.setVideoScalingMode(MediaPlayer.VIDEO_SCALING_MODE_SCALE_TO_FIT);            } else {                Toast.makeText(context, "Init MediaPlayer Failed", Toast.LENGTH_SHORT).show();            }        } catch (IOException e) {            e.printStackTrace();        }    }    public void destroyVideo() {        if (mediaPlayer != null) {            mediaPlayer.stop();            mediaPlayer.reset();            mediaPlayer.release();            mediaPlayer = null;        }        if (surfaceHolder != null) {            surfaceHolder.addCallback(null);            surfaceHolder = null;        }        if (player_surfaceView != null) {            player_surfaceView.getHolder().getSurface().release();            player_surfaceView = null;        }        video_position = 0;        if (onPreparedListener != null) {            onPreparedListener = null;        }        if (onCompletionListener != null) {            onCompletionListener = null;        }    }    public void seekTo(int position) {        if (mediaPlayer != null) {            mediaPlayer.seekTo(position);        }    }    public int getCurrentPosition() {        return mediaPlayer != null ? mediaPlayer.getCurrentPosition() : 0;    }    public int getDuration() {        return mediaPlayer != null ? mediaPlayer.getDuration() : 0;    }    public void setMediaVolum(boolean isMute) {        this.isMute = isMute;        if (isMute) {            if (mediaPlayer != null) {                mediaPlayer.setVolume(0f, 0f);            }        } else {            //  Request audio focus for playback              int result = audioManager.requestAudioFocus(null, AudioManager.STREAM_MUSIC,                    AudioManager.AUDIOFOCUS_GAIN);            if (result == AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {                if (mediaPlayer != null) {                    mediaPlayer.setVolume(1f, 1f);                }            }        }    }    public void setAutoPlay(boolean isAuto) {        this.isFirstPlay = isAuto;    }    @Override    public void onBufferingUpdate(MediaPlayer mp, int percent) {    }    @Override    public void onCompletion(MediaPlayer mp) {        isPlaying = false;        video_position = 0;        if (onCompletionListener != null) {            onCompletionListener.onCompletion(mediaPlayer);        }    }    @Override    public boolean onError(MediaPlayer mp, int what, int extra) {        return false;    }    @Override    public void onPrepared(MediaPlayer mediaPlayer) {        Log.i(TAG, "onPrepared");        // 开始播放        mediaPlayer.start();        if (!isPlaying) {            mediaPlayer.pause();        } else {        }        isPrepare = true;        if (onPreparedListener != null) {            onPreparedListener.onPrepared();        }        new Handler().postDelayed(new Runnable() {            @Override            public void run() {                //跳转指定位置                if (video_position > 0) {                    Log.i(TAG, "onPrepared---video_position:" + video_position);                    IMediaPlayer.this.mediaPlayer.seekTo(video_position);                    video_position = 0;                }            }        }, 33);    }    @Override    public void onSeekComplete(MediaPlayer mp) {    }    @Override    public void surfaceCreated(SurfaceHolder holder) {        Log.i(TAG, "surfaceCreated");        mediaPlayer = new MediaPlayer();        mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);        mediaPlayer.setDisplay(holder);        // 播放完成的监听        mediaPlayer.setOnCompletionListener(this);        // 异步准备的一个监听函数，准备好了就调用里面的方法        mediaPlayer.setOnPreparedListener(this);        // 播放错误的监听        mediaPlayer.setOnErrorListener(this);        mediaPlayer.setOnBufferingUpdateListener(this);        if (isFirstPlay) {            //添加播放路径            try {                mediaPlayer.setDataSource(videoPath);                if (isMute) {                    mediaPlayer.setVolume(0f, 0f);                } else {                    if (mediaPlayer != null) {                        mediaPlayer.setVolume(1f, 1f);                    }                }                // 准备开始,异步准备，自动在子线程中                mediaPlayer.prepareAsync();                //视频缩放模式                mediaPlayer.setVideoScalingMode(MediaPlayer.VIDEO_SCALING_MODE_SCALE_TO_FIT);            } catch (IOException e) {                e.printStackTrace();            }        }        isFirstPlay = true;    }    @Override    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {    }    @Override    public void surfaceDestroyed(SurfaceHolder holder) {        Log.i(TAG, "surfaceDestroyed");        if (mediaPlayer != null) {            mediaPlayer.pause();            video_position = mediaPlayer.getCurrentPosition();        }    }    //SurfaceView初始化完成回调    private OnPreparedListener onPreparedListener;    public void setOnPreparedListener(OnPreparedListener onPreparedListener) {        this.onPreparedListener = onPreparedListener;    }    public interface OnPreparedListener {        void onPrepared();    }    //-----------------------播放完回调    private OnCompletionListener onCompletionListener;    public void setOnCompletionListener(OnCompletionListener onCompletionListener) {        this.onCompletionListener = onCompletionListener;    }    public interface OnCompletionListener {        void onCompletion(MediaPlayer mediaPlayer);    }}