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.

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