Android MediaPlayer简单的实用以及续播的实现

原文：https://blog.csdn.net/uyy203/article/details/72460564

MianActivity.java

package xyz.video;

import android.app.Activity;
import android.content.res.AssetFileDescriptor;
import android.content.res.AssetManager;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.Window;

public class MainActivity extends Activity {

    private MediaPlayer mp = new MediaPlayer();
    private SurfaceView surfaceView;
    private SurfaceHolder surfaceHolder;
    private int currentIndex = 0; //播放进度
    private boolean isSurfaceCreated=false;//surface是否已创建

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_main);


        surfaceView = (SurfaceView) findViewById(R.id.surfaceView);


        mp = new MediaPlayer();
        createSurface();


        mp.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
            @Override
            public void onPrepared(MediaPlayer mp) {
                mp.seekTo(currentIndex);
                mp.start();
            }
        });


        //播放完成时
        mp.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
            @Override
            public void onCompletion(MediaPlayer mp) {
                releasePlayer();
//                surfaceView.setVisibility(View.GONE);
            }
        });

    }


    private SurfaceHolder.Callback mCallback = new SurfaceHolder.Callback() {
        @Override
        public void surfaceCreated(SurfaceHolder surfaceHolder) {
            // 当Surface被创建时触发
            if (surfaceHolder == null) return;

            isSurfaceCreated=true;

            play();

            Log.e("surface", "created");



        }

        @Override
        public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i1, int i2) {
            // 当Surface尺寸等参数改变时触发
            Log.e("surface", "changed");
        }

        @Override
        public void surfaceDestroyed(SurfaceHolder Holder) {
            // 当Surface被销毁时触发
            Log.e("surface", "Destroyed");
            isSurfaceCreated=false;
            surfaceHolder=null;
        }
    };


    //创建surface
    private void createSurface(){
        if(mp==null) return;
        surfaceHolder = surfaceView.getHolder();
        surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); //兼容4.0以下的版本
        surfaceHolder.addCallback(mCallback);
    }


    //释放mediaplayer
    private void releasePlayer(){
        if(mp!=null){
            mp.stop();
            mp.release();
            mp=null;
            surfaceView.setVisibility(View.GONE);
        }
    }


    //播放
    private void play(){

        if(mp==null) return;

        try {
            /**raw目录**/
            mp.reset();
//                //在这里我们指定MediaPlayer在当前的Surface中进行播放
//                Uri uri=Uri.parse("android.resource://"+getPackageName()+"/"+R.raw.welcome_video_720_1280);
//                mp.setDisplay(surfaceHolder);
//                mp.setDataSource(getBaseContext(),uri);
//                //在指定了MediaPlayer播放的容器后，我们就可以使用prepare或者prepareAsync来准备播放了
//                mp.prepareAsync();


            /**assets目录**/
            mp.reset();
            AssetManager assetManager = getAssets();
            // 取得音频文件
            AssetFileDescriptor descriptor = assetManager.openFd("welcome_video_720_1280.mp4");
            // 加载音频，但还未完全准备
            mp.setDisplay(surfaceHolder);
            mp.setDataSource(descriptor.getFileDescriptor(), descriptor.getStartOffset(), descriptor.getLength());
            mp.prepareAsync();

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

    }


    @Override
    protected void onPause() {
        super.onPause();
        try {
            //假如正在播放，程序因进入后台等原因进入onPause,记录当前播放进度
            if (mp != null && mp.isPlaying()) {
                currentIndex = mp.getCurrentPosition();
                mp.pause();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        Log.e("activity", "destroy");
        releasePlayer();//释放MediaPlayer
    }


    @Override
    protected void onRestart() {
        super.onRestart();
        //重新进入app,假如surface还没被创建，再次创建
        if(!isSurfaceCreated) {
            createSurface();
        }
    }

    @Override
    protected void onResume() {
        super.onResume();
        //重新进入App后，在暂停的位置开始播放
        if(isSurfaceCreated) {
            play();
        }
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="xyz.video.MainActivity">


    <SurfaceView
        android:id="@+id/surfaceView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        />

</RelativeLayout>