android MediaPlayer和VideoView的使用

MainActivity.java：

public class MainActivity extends AppCompatActivity implements View.OnClickListener{
    private Button play,pause,stop,videoButton;
    private VideoView videoView;
    private MediaPlayer mediaPlayer;
    private boolean fullscreen;


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

        play=(Button)findViewById(R.id.button);
        pause=(Button)findViewById(R.id.button1);
        stop=(Button)findViewById(R.id.button2);
        videoView=(VideoView)findViewById(R.id.video_view);
        videoButton=(Button)findViewById(R.id.videoButton);

        play.setOnClickListener(this);
        pause.setOnClickListener(this);
        stop.setOnClickListener(this);
        videoButton.setOnClickListener(this);
        initMediaPlayer();  //初始化MediaPlayer
    }
    private void initMediaPlayer(){
        try {
            mediaPlayer=MediaPlayer.create(this,R.raw.be_wth_you);
            mediaPlayer.prepare();
        }catch (IllegalStateException e){
            e.printStackTrace();
        } catch (IOException e){
            e.printStackTrace();
        }
    }
    //实现全屏
    public void fullScreen1(){
        if(!fullscreen){
            RelativeLayout.LayoutParams layoutParams=
                    new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.MATCH_PARENT);
            layoutParams.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
            layoutParams.addRule(RelativeLayout.ALIGN_PARENT_TOP);
            layoutParams.addRule(RelativeLayout.ALIGN_PARENT_LEFT);
            layoutParams.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
            videoView.setLayoutParams(layoutParams);
            fullscreen = true;//改变全屏/窗口的标记
        }else{
            RelativeLayout.LayoutParams lp=new RelativeLayout.LayoutParams(320,240);
            lp.addRule(RelativeLayout.CENTER_IN_PARENT);
            videoView.setLayoutParams(lp);
            fullscreen=false;
        }
    }
    public void startVideo(){
        fullScreen1();//实现全屏
        videoView.setMediaController(new MediaController(this));  //控制播放与暂停的控件
        //Uri是统一资源标识符，作用：根据这个Uri找到某个资源文件，实际上就是生成了一个路径
        Uri rawUri=Uri.parse("android.resource://"+getPackageName()+"/"+R.raw.waiting_for_love);
        videoView.setVideoURI(rawUri);
        videoView.start();
    }
    @Override
    public void onClick(View v){
        switch (v.getId()){
            case R.id.button:
                if(!mediaPlayer.isPlaying()){
                    if(!videoView.isPlaying()){
                        Toast.makeText(MainActivity.this,"play",Toast.LENGTH_SHORT).show();
                        mediaPlayer.start();  //开始播放
                    }else{
                        videoView.pause();
                        mediaPlayer.start();
                    }
                }
                break;
            case R.id.button1:
                if(mediaPlayer.isPlaying()){
                    mediaPlayer.pause();  //暂停播放
                }
                break;
            case R.id.button2:
                if(mediaPlayer.isPlaying()){
                    mediaPlayer.reset();  //停止播放
                    initMediaPlayer();
                }
                break;
            case R.id.videoButton:
                if(!videoView.isPlaying()){
                    if(!mediaPlayer.isPlaying()){
                        startVideo();
                    }else{
                        mediaPlayer.reset();
                        initMediaPlayer();
                        startVideo();
                    }
                }
                break;
            default:
                break;
        }

    }
    @Override
    protected void onDestroy(){
        super.onDestroy();
        if(mediaPlayer!=null){
            mediaPlayer.stop();
            mediaPlayer.release();
        }
        if(videoView!=null){
            videoView.suspend();  //将VideoView所占用的资源释放掉
        }

    }
}

xml：

xml version="1.0" encoding="utf-8"?>
<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="match_parent"
    android:orientation="vertical">

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="50dp"
    android:orientation="horizontal">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/play"
        android:id="@+id/button"
        android:textAllCaps="false"
        android:layout_weight="1"/>

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Pause"
        android:id="@+id/button1"
        android:layout_weight="1"
        android:textAllCaps="false"/>

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Stop"
        android:id="@+id/button2"
        android:layout_weight="2"
        android:textAllCaps="false"/>
LinearLayout>
<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_weight="1">
    <VideoView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_centerInParent="true"
        android:id="@+id/video_view"/>
RelativeLayout>
    <Button
        android:id="@+id/videoButton"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textAllCaps="false"
        android:text="Start video"/>
LinearLayout>

AndroidMainfest.xml：

android:screenOrientation="sensor"  //实现屏幕的横屏竖屏切换，

有以下值可选：

"unspecified"- 默認值. 由系統選擇顯示方向. 在不同的設備可能會有所不同.
"landscape"- 橫向
"portrait"- 縱向
"user"- 用戶當前的首選方向
"behind"- 與在活動堆棧下的活動相同方向
"sensor"- 根據物理方向傳感器確定方向. 取決於用戶手持的方向, 當用戶轉動設備, 它跟隨改變.
"nosensor"- 不經物理方向傳感器確定方向. 該傳感器被忽略, 所以當用戶轉動設備, 顯示不會跟隨改變. 除了這個區別，系統選擇使用相同的政策取向對於“未指定”設置. 系統根據“未指定”("unspecified")設定選擇相同顯示方向.