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service实现启动，停止，暂停/继续播放音乐

发布时间:2016年05月10日 评论数：抢沙发 阅读数：388

1.创建界面（通过onClick实现侦听)

<TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView1"
        android:layout_alignParentRight="true"
        android:layout_below="@+id/textView1"
        android:layout_marginTop="18dp"
        android:onClick="onClick"
        android:text="播放" />

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/button1"
        android:layout_alignRight="@+id/button1"
        android:layout_below="@+id/button1"
        android:layout_marginTop="20dp"        
        android:onClick="onClick"
        android:text="停止" />

    <Button
        android:id="@+id/button3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/button2"
        android:layout_alignRight="@+id/button2"
        android:layout_below="@+id/button2"
        android:layout_marginTop="24dp"
        android:onClick="onClick"
        android:text="暂停/继续" />

2.MainActivity

package com.example.firstapp;

import com.example.firstapp.MusicService.LocalBinder;

import android.app.Activity;
import android.app.Service;
import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends Activity {
	MusicService muservice = null;
	
	static TextView tv = null;
	static Handler handler = new Handler();
	static String mstr = null;
	public static void updateUI(String str){//更新到TextView
		mstr = str;
		handler.post(new Runnable() {
			@Override
			public void run() {
				tv.setText(mstr);
			}
		});
	}
	
	ServiceConnection conn = new ServiceConnection() {
		@Override
		public void onServiceDisconnected(ComponentName name) {			
		}
		@Override
		public void onServiceConnected(ComponentName name, IBinder service) {
			muservice = ((LocalBinder)service).getService();
		}
	};
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		tv =(TextView) findViewById(R.id.textView1);
	}
	public void onClick(View v){
		switch(v.getId()){
		case R.id.button1:
			Intent intent = new Intent(MainActivity.this,MusicService.class);
			bindService(intent, conn, BIND_AUTO_CREATE);
			break;
		case R.id.button2:
			unbindService(conn);
			break;
		case R.id.button3:
			muservice.PauseOrGo();
			break;
		default:
			break;
		}
	}
	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}
	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		// Handle action bar item clicks here. The action bar will
		// automatically handle clicks on the Home/Up button, so long
		// as you specify a parent activity in AndroidManifest.xml.
		int id = item.getItemId();
		if (id == R.id.action_settings) {
			return true;
		}
		return super.onOptionsItemSelected(item);
	}
}

3.MusicService(记得注册)

package com.example.firstapp;

import android.app.Service;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.Binder;
import android.os.IBinder;
import android.provider.MediaStore.Audio.Media;
import android.text.style.UpdateAppearance;
import android.widget.TextView;

public class MusicService extends Service {
	MediaPlayer player = null;
	class LocalBinder extends Binder{
		public MusicService getService(){
			return MusicService.this;
		}
	}
	@Override
	public IBinder onBind(Intent intent) {
		player.start();
		MainActivity.updateUI("音乐开始播放");
		return new LocalBinder();
	}
	@Override
	public void onCreate() {
		player = MediaPlayer.create(this, R.raw.song);
		super.onCreate();
	}
	@Override
	public void onDestroy() {
		super.onDestroy();
	}
	@Override
	public boolean onUnbind(Intent intent) {
		player.stop();
		MainActivity.updateUI("音乐停止播放");
		return super.onUnbind(intent);
	}
	public void PauseOrGo(){
		if(player.isPlaying()){
			player.pause();
			MainActivity.updateUI("音乐暂停播放");
		}else{
			player.start();
			MainActivity.updateUI("音乐继续播放");
		}
	}
}