首先編寫一個類繼承Service這個基類,重寫裏面的方法,然後在Activity中調用startService()和stopService()來啓動和停止服務
package com.service.activity;
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.util.Log;
public class ExampleService extends Service{
private static final String TAG = "ExampleService";
@Override
public void onCreate() {
Log.i(TAG, "ExampleService-onCreate");
super.onCreate();
}
@Override
public void onStart(Intent intent, int startId) {
Log.i(TAG, "ExampleService-onStart");
super.onStart(intent, startId);
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
//執行文件的下載或者播放等操作
Log.i(TAG, "ExampleService-onStartCommand");
/*
* 這裏返回狀態有三個值,分別是:
* 1、START_STICKY:當服務進程在運行時被殺死,系統將會把它置爲started狀態,但是不保存其傳遞的Intent對象,之後,系統會嘗試重新創建服務;
* 2、START_NOT_STICKY:當服務進程在運行時被殺死,並且沒有新的Intent對象傳遞過來的話,系統將會把它置爲started狀態,
* 但是系統不會重新創建服務,直到startService(Intent intent)方法再次被調用;
* 3、START_REDELIVER_INTENT:當服務進程在運行時被殺死,它將會在隔一段時間後自動創建,並且最後一個傳遞的Intent對象將會再次傳遞過來。
*/
return super.onStartCommand(intent, flags, startId);
}
@Override
public IBinder onBind(Intent intent) {
Log.i(TAG, "ExampleService-onBind");
return null;
}
@Override
public void onDestroy() {
Log.i(TAG, "ExampleService-onDestroy");
super.onDestroy();
}
}
MainActivity.java
[html]
package com.service.activity;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class MainActivity extends Activity implements OnClickListener{
private static final String TAG = "MainActivity"; //日誌輸出標誌
private Button btnStartService;
private Button btnStopService;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btnStartService = (Button)findViewById(R.id.btnStartService);
btnStopService = (Button)findViewById(R.id.btnStopService);
btnStartService.setOnClickListener(this);
btnStopService.setOnClickListener(this);
}
//點擊事件處理監聽器
@Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this,ExampleService.class);
switch(v.getId()){
case R.id.btnStartService:
startService(intent);
break;
case R.id.btnStopService:
stopService(intent);
break;
default:
break;
}
}
}