android Mediaplayer的简单程序
程序的功能很简单、就是通过
intent.setAction(Intent.ACTION_GET_CONTENT);
intent.setType("Audio/*");
查询可以播放的音频文件、在onActivityResult中用Uri uri=intent.getData();获得路径、然后播放的功能、
问题：当我仅仅实现play功能的时候没发生问题、当我去掉stop和pause前面的斜杠的时候提示：
public class MainActivity extends Activity implements MediaPlayer.OnCompletionListener {
private ImageButton play,pause,stop;
MediaPlayer player=new MediaPlayer();
private String path="";
private Button sousuo;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
play=(ImageButton)findViewById(R.id.play);
pause=(ImageButton)findViewById(R.id.pause);
stop=(ImageButton)findViewById(R.id.stop);
sousuo=(Button)findViewById(R.id.sousuo);
play.setEnabled(true);
pause.setEnabled(false);
stop.setEnabled(false);
play.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
playing();
}
});
// stop.setOnClickListener(new OnClickListener() {
//
//@Override
//public void onClick(View v) {
//// TODO Auto-generated method stub
//play.setEnabled(true);
//stop.setEnabled(false);
//pause.setEnabled(false);
//if(player.isPlaying()){
//player.stop();
////player.reset();
//try {
//player.prepare();
//player.seekTo(0);
//} catch (IllegalStateException e) {
//// TODO Auto-generated catch block
//e.printStackTrace();
//} catch (IOException e) {
//// TODO Auto-generated catch block
//e.printStackTrace();
//}
//}
//}
//});
// pause.setOnClickListener(new OnClickListener() {
//
//@Override
//public void onClick(View v) {
//// TODO Auto-generated method stub
//play.setEnabled(true);
//stop.setEnabled(true);
//pause.setEnabled(false);
//player.pause();
//try {
//player.prepare();
//} catch (IllegalStateException e) {
//// TODO Auto-generated catch block
//e.printStackTrace();
//} catch (IOException e) {
//// TODO Auto-generated catch block
//e.printStackTrace();
//}
//}
//});
sousuo.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent=new Intent();
intent.setAction(Intent.ACTION_GET_CONTENT);
intent.setType("Audio/*");
startActivityForResult(intent, 0);
}
});
}
public void onActivityResult(int i,int b,Intent intent){
if(intent!=null){
Uri uri=intent.getData();
String p=uri.toString().substring(52);
System.out.println(p);
path=p;
}
}
public void playing(){
if(path!=null&& !path.equals("")){
play.setEnabled(false);
stop.setEnabled(true);
pause.setEnabled(true);
try {
player.reset();
File file=new File(path);
FileInputStream fis=new FileInputStream(file);
player.setDataSource(fis.getFD());
System.out.println(fis.getFD().toString());
player.prepare();
player.start();
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
@Override
public void onCompletion(MediaPlayer arg0) {
// TODO Auto-generated method stub
player.release();
play.setEnabled(true);
stop.setEnabled(false);
pause.setEnabled(false);
}
}
<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"
>
<TextView
android:id="@+id/text01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="迷你音乐播放器"
tools:context=".MainActivity"
/>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
>
<ImageButton
android:id="@+id/play"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/play"
/>
<ImageButton
android:id="@+id/pause"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:src="@drawable/pause"
/>
<ImageButton
android:id="@+id/stop"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:src="@drawable/stop"
/>
</LinearLayout>
<Button
android:id="@+id/sousuo"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:text="选择歌曲"
android:layout_gravity="right"
/>
</LinearLayout>
public void playing(){
if(path!=null&& !path.equals("")){
play.setEnabled(false);
stop.setEnabled(true);
pause.setEnabled(true);
if(player!=null){
player.reset();
player.release();
player=null
}
try {
player=new MediaPlayer();
File file=new File(path);
FileInputStream fis=new FileInputStream(file);
player.setDataSource(fis.getFD());
System.out.println(fis.getFD().toString());
player.prepare();
player.start();
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
@Override
public void onCompletion(MediaPlayer arg0) {
// TODO Auto-generated method stub
player.release();
play.setEnabled(true);
stop.setEnabled(false);
pause.setEnabled(false);
}
}