TextureView实现视频播放

TextureView在4.0(API level 14)中引入。它能够将内容流直接投影到View中，能够用于实现Live preview等功能。和SurfaceView不一样，它不会在WMS中单首创建窗口，而是做为View hierachy中的一个普通View，所以能够和其它普通View同样进行移动，旋转，缩放，动画等变化。值得注意的是TextureView必须在硬件加速的窗口中。它显示的内容流数据能够来自App进程或是远端进程。从类图中能够看到，TextureView继承自View，它与其它的View同样在View hierachy中管理与绘制。TextureView重载了draw()方法，其中主要把SurfaceTexture中收到的图像数据做为纹理更新到对应的HardwareLayer中。SurfaceTexture.OnFrameAvailableListener用于通知TextureView内容流有新图像到来。SurfaceTextureListener接口用于让TextureView的使用者知道SurfaceTexture已准备好，这样就能够把SurfaceTexture交给相应的内容源。Surface为BufferQueue的Producer接口实现类，使生产者能够经过它的软件或硬件渲染接口为SurfaceTexture内部的BufferQueue提供graphic buffer。

结构类图以下

这里不啰嗦解释，具体看官方API文档

Textureview API

MainView

自定义一个view，注意TextureView中的draw方法和onDraw方法都是被定义成final的，不能被子类覆盖。因此必须能够经过实现TextureView.SurfaceTextureListener 接口，而后重写onSurfaceTextureAvailable方法，把你想添加的功能加到这个方法里便可，这里加入播放视频的功能

package com.test.xingliu.texturesample;

import android.content.Context;
import android.graphics.SurfaceTexture;
import android.media.MediaPlayer;
import android.view.Surface;
import android.view.TextureView;

import java.io.IOException;

/** * Created by Xingliu on 2016/12/5. */
public class MainView extends TextureView implements TextureView.SurfaceTextureListener {
    private static final String FILE_NAME = "rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mov";

    private MediaPlayer mMediaPlayer;


    public MainView(Context context) {
        super(context);
        initView();

    }

    public void stopPlay() {
        if (mMediaPlayer != null) {
            mMediaPlayer.stop();
            mMediaPlayer.release();
            mMediaPlayer = null;
        }

    }

    private void initView() {
        setSurfaceTextureListener(this);

    }

    @Override
    public void onSurfaceTextureAvailable(SurfaceTexture surfaceTexture, int i, int i2) {

        Surface surface = new Surface(surfaceTexture);
        try {

            mMediaPlayer = new MediaPlayer();
            mMediaPlayer.setDataSource(FILE_NAME);
            mMediaPlayer.setSurface(surface);
            mMediaPlayer.prepareAsync();
            mMediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
                @Override
                public void onPrepared(MediaPlayer mp) {
                    mMediaPlayer.start();
                }
            });

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

    }

    @Override
    public void onSurfaceTextureSizeChanged(SurfaceTexture surfaceTexture, int i, int i2) {
    }

    @Override
    public boolean onSurfaceTextureDestroyed(SurfaceTexture surfaceTexture) {
        return true;
    }

    @Override
    public void onSurfaceTextureUpdated(SurfaceTexture surfaceTexture) {
    }
}

对应的activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="176dp"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity">

    <com.test.xingliu.texturesample.MainView
        android:id="@+id/textureView"
        android:layout_width="match_parent"
        android:layout_height="176dp"
        android:orientation="vertical"
        android:paddingBottom="@dimen/activity_vertical_margin"
        android:paddingLeft="@dimen/activity_horizontal_margin"
        android:paddingRight="@dimen/activity_horizontal_margin" />


</LinearLayout>

MainActivity

package com.test.xingliu.texturesample;

import android.app.Activity;
import android.os.Bundle;

public class MainActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(new MainView(this));
    }

    @Override
    protected void onDestroy() {
        new MainView(this).stopPlay();
        super.onDestroy();
    }


}

mainifest文件

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.test.xingliu.texturesample">

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <application  android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:supportsRtl="true" android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

效果图以下，因为资源是网络上的，须要联网才能播放

须要注意到是在硬件加速的状况下，TextureView是用GPU渲染的，软件上的Canvas是不能进行处理的，而TextureView必须在硬件加速的窗口中，能够调用lockcanvas()方法来获取canvas