android service

service类：

package com.example.service;

import android.app.Service;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.IBinder;
import android.util.Log;
import android.widget.Toast;
/**
 * service也是运行在主线程，如果处理比较耗时的操作一样要另起新线程，
 * 没有startservice的情况下stopservice不会报错，没有onbindservice的情况下，onunbindservice会报错。
 * bindservice需要serviceconnection对象关联。start不需要。
 * 需要在配置文件中声明service。
 * 
 * @author Administrator
 *
 */
public class servicedemo extends Service {
	private MediaPlayer mediaPlayer = null;
	private static final String TAG = "MusicService";
//oncreate-onstart-ondestroy
	//oncreate-onbind-onunbind-ondestroy
	@Override
	public IBinder onBind(Intent intent) {
		// TODO Auto-generated method stub
		Toast.makeText(servicedemo.this, "onBind()", Toast.LENGTH_LONG).show();
		Log.i(TAG, "onBind()");
		mediaPlayer.start();
		return null;
	}

	@Override
	public void onCreate() {
		// TODO Auto-generated method stub
		Toast.makeText(servicedemo.this, "onCreate()", Toast.LENGTH_LONG).show();
		Log.i(TAG, "onCreate()");
		mediaPlayer=MediaPlayer.create(servicedemo.this, R.raw.huranzhijian);
//在res文件夹下新建raw文件夹，放入一个mp3文件作为播放文件。
	}

	@Override
	public void onDestroy() {
		// TODO Auto-generated method stub
		Toast.makeText(servicedemo.this, "onDestroy()", Toast.LENGTH_LONG).show();
		Log.i(TAG, "onDestroy()");
		mediaPlayer.stop();
	}

	@Override
	public void onRebind(Intent intent) {
		// TODO Auto-generated method stub
		Toast.makeText(servicedemo.this, "onRebind()", Toast.LENGTH_LONG).show();
		Log.i(TAG, "onRebind()");
	}

	@Override
	public void onStart(Intent intent, int startId) {
		// TODO Auto-generated method stub
		Toast.makeText(servicedemo.this, "onStart()", Toast.LENGTH_LONG).show();
		Log.i(TAG, "onStart()");
		mediaPlayer.start();
	}

	@Override
	public boolean onUnbind(Intent intent) {
		// TODO Auto-generated method stub
		Toast.makeText(servicedemo.this, "onUnbind()", Toast.LENGTH_LONG).show();
		Log.i(TAG, "onUnbind()");
		return false;
	}

}

 主Activity：

package com.example.service;

import android.app.Activity;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity {
	private Button start = null;
	private Button stop = null;
	private Button onbind = null;
	private Button unbind = null;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		start = (Button) findViewById(R.id.service_start);
		stop = (Button) findViewById(R.id.service_stop);
		onbind = (Button) findViewById(R.id.service_onbind);
		unbind = (Button) findViewById(R.id.service_unbind);

		start.setOnClickListener(clickListener);
		stop.setOnClickListener(clickListener);
		onbind.setOnClickListener(clickListener);
		unbind.setOnClickListener(clickListener);
	}

	/**
	 * ServiceConnection
	 */
	final ServiceConnection serviceConnection = new ServiceConnection() {

		@Override
		public void onServiceDisconnected(ComponentName name) {
			// TODO Auto-generated method stub
			// 解除链接时调用
		}

		@Override
		public void onServiceConnected(ComponentName name, IBinder service) {
			// TODO Auto-generated method stub
			// 绑定链接时调用
		}
	};
	android.view.View.OnClickListener clickListener = new OnClickListener() {

		@Override
		public void onClick(View v) {
			// TODO Auto-generated method stub
			Intent intent = new Intent(MainActivity.this,
					com.example.service.servicedemo.class);
			switch (v.getId()) {
			case R.id.service_start:
				startService(intent);
				break;

			case R.id.service_stop:
				stopService(intent);
				break;
			case R.id.service_onbind:
				bindService(intent, serviceConnection, Context.BIND_AUTO_CREATE);
				break;
			case R.id.service_unbind:
				unbindService(serviceConnection);
			}
		}
	};
}

 布局文件：

<RelativeLayout 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"
    tools:context=".MainActivity" >

    <Button
        android:id="@+id/service_start"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginLeft="22dp"
        android:layout_marginTop="35dp"
        android:text="start" />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_toRightOf="@+id/service_start"
        android:text="service使用"
        android:textAppearance="?android:attr/textAppearanceMedium" />

    <Button
        android:id="@+id/service_stop"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/service_start"
        android:layout_alignBottom="@+id/service_start"
        android:layout_alignLeft="@+id/textView1"
        android:layout_marginLeft="20dp"
        android:text="stop" />

    <Button
        android:id="@+id/service_onbind"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/service_stop"
        android:layout_alignBottom="@+id/service_stop"
        android:layout_toRightOf="@+id/textView1"
        android:text="onbind" />

    <Button
        android:id="@+id/service_unbind"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/service_onbind"
        android:layout_alignBottom="@+id/service_onbind"
        android:layout_alignParentRight="true"
        android:text="unbind" />

</RelativeLayout>

配置文件：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.service"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="8" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <service android:name="com.example.service.servicedemo" >
        </service>

        <activity
            android:name="com.example.service.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>