显示启动Service服务简单栗子

安卓大作业第一题突然间要求有Service服务，使用Toast在界面上产生提示消息，于是。。

效果如下：

代码如下：

额，照着书上打的。

package com.example.helloworld;

import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.app.Activity;
import android.content.Intent;

public class MainActivity extends Activity {
	    
    
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		Button startButton=(Button)findViewById(R.id.startButton);
		//Button stopButton=(Button)findViewById(R.id.stopButton);
		
		final Intent serviceIntent = new Intent(this,ServiceSubclass.class);
		
		startButton.setOnClickListener(new Button.OnClickListener(){

			@Override
			public void onClick(View view) {
				startService(serviceIntent);	
			}
		});
		
		
		
	}
   
	

}

package com.example.helloworld;

import android.app.AlertDialog.Builder;
import android.app.Dialog;
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.view.WindowManager;
import android.widget.Toast;
import android.app.AlertDialog.Builder;
import android.app.Dialog;
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.view.WindowManager;

public class ServiceSubclass extends Service {
	
	public void onCreate() {
		super.onCreate();
		Toast.makeText(this, "1onCreate()", Toast.LENGTH_LONG).show();
	}
	
	@Override
	public void onStart(Intent intent, int startId) {
		super.onStart(intent, startId);
		Toast.makeText(this, "天下无不散筵席", Toast.LENGTH_LONG).show();
	}
		
	@Override
	public void onDestroy() {
		super.onDestroy();
		Toast.makeText(this, "3onDestroy()", Toast.LENGTH_LONG).show();
	}

	@Override
	public IBinder onBind(Intent intent) {
		// TODO Auto-generated method stub
		return null;
	}

	
}

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

    <uses-sdk
        android:minSdkVersion="17"
        android:targetSdkVersion="17" />
    
    <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>

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

</manifest>

<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"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.helloworld.MainActivity" >

    <TextView    
        android:id="@+id/a"   
        android:layout_width="match_parent"       
        android:layout_height="wrap_content"      
        android:text="Hello The Android World!!!"/>

     <Button
        android:id="@+id/startButton"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="I am a button!!!~" 
        android:layout_below="@+id/a"
     />
    
   


</RelativeLayout>