Android之MediaPlayer简单应用

  Android系统中为了能够播放视频，我们需要使用到MediaPlayer相关的类和SurfaceView类，前者是视频控制，后者是承载视频的内容，类似于画板的作用。整个实现思路先自定义一个SurfaceView类，用于后期扩展需要，在自定义一个简单的视频播放器皮肤，然后将皮肤绑定到Java视图View上，在View里面完成控件加载和视频播放控制，整个实现代码如下。

1.播放器SurfaceView自定义类

import android.content.Context;import android.util.AttributeSet;import android.view.SurfaceView;public class VideoSurface extends SurfaceView {    public VideoSurface(Context context) {        super(context);    }    public VideoSurface(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);    }    public VideoSurface(Context context, AttributeSet attrs) {        super(context, attrs);    }}

2.自定义的一个简单皮肤

</pre><pre name="code" class="java"><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent">    <com.matrix.mediaplayer.VideoSurface        android:id="@+id/video_surface"        android:layout_width="350dp"        android:layout_height="300dp"        android:layout_centerInParent="true"        android:visibility="visible" />    <Button        android:id="@+id/btn_play_media"        android:layout_width="350dp"        android:layout_height="wrap_content"        android:layout_alignParentBottom="true"        android:layout_centerHorizontal="true"        android:inputType="text"        android:text="Play"        android:visibility="visible" /></RelativeLayout>

3. 自定义播放器

import android.content.Context;import android.media.AudioManager;import android.media.MediaPlayer;import android.util.AttributeSet;import android.view.LayoutInflater;import android.view.SurfaceHolder;import android.view.View;import android.widget.Button;import android.widget.LinearLayout;/** * 自定义播放器 */public class CustomMediaPlayer extends LinearLayout {    private static final String TAG = "CustomMediaPlayer";    private VideoSurface videoSurface;    private SurfaceHolder holder;    private Button btnStartMedia;    private View videoSkinView;    private Context mContext;    private MediaPlayer mediaPlayer;    public CustomMediaPlayer(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        this.mContext = context;        initMediaView();    }    public CustomMediaPlayer(Context context, AttributeSet attrs) {        super(context, attrs);        this.mContext = context;        initMediaView();    }    public CustomMediaPlayer(Context context) {        super(context);        this.mContext = context;        initMediaView();    }    /*     * 初始化视图控件以及相应的事件     */    private void initMediaView() {        videoSkinView = LayoutInflater.from(mContext).inflate(R.layout.mediaplayer_skin, null);        videoSurface = (VideoSurface) videoSkinView.findViewById(R.id.video_surface);        btnStartMedia = (Button) videoSkinView.findViewById(R.id.btn_play_media);        //添加播放事件        btnStartMedia.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View v) {                play();            }        });        //设置回调        surfaceViewCallback();        // 将控件添加到视图上绑定        addView(videoSkinView);    }    /**     * SurfaceView对应的Callback回调函数,当SurfaceView创建好,修改或者销毁时候回调     */    private void surfaceViewCallback() {        holder = videoSurface.getHolder();        holder.addCallback(new SurfaceHolder.Callback() {            @Override            public void surfaceCreated(SurfaceHolder holder) {                play();            }            @Override            public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {            }            @Override            public void surfaceDestroyed(SurfaceHolder holder) {            }        });    }    /**     * 播放视频     */    private void play() {        //如果mediaplayer不是第一次创建,清除mediaplayer播放设置        if (mediaPlayer != null) {            mediaPlayer.reset();        }        mediaPlayer = MediaPlayer.create(mContext, R.raw.demo);        mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);        mediaPlayer.setDisplay(holder);        //设置播放前准备事件的监听,视频准备好播放后回调        mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {            @Override            public void onPrepared(MediaPlayer mp) {                mediaPlayer.start();            }        });    }}

4.Activity对应的XML文件中引用

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent">    <com.matrix.mediaplayer.CustomMediaPlayer        android:layout_width="match_parent"        android:layout_height="match_parent"        android:layout_centerInParent="true"        android:gravity="center"        android:visibility="visible"></com.matrix.mediaplayer.CustomMediaPlayer></RelativeLayout>

5.Activity设置绑定视图

import android.support.v7.app.AppCompatActivity;import android.os.Bundle;public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }}