我正在实施用于在Android设备中接收推送通知的服务。当应用处于前台时,会成功收到通知。关闭应用程序并从任务管理器清除其实例时,不会收到通知。
我希望服务始终保持运行,即使从任务管理器中清除了应用程序,它也不会停止。
我通过点击按钮从我的活动中启动服务。当我点击按钮时,我的服务启动,它每隔一分钟给我一次Toast通知,但如果我按下后退按钮,那么我的服务也在运行,但是,一旦我从最近的活动列表清除我的应用程序,这在长按主页按钮我的服务是停止的,如果我再次启动我的应用程序并检查服务的状态,但它没有运行。
即使我的应用已关闭,我也希望我的服务能够投放。
这是我的活动课
package com.example.hello;
import java.util.ArrayList;
import android.app.Activity;
import android.app.ActivityManager;
import android.app.ActivityManager.RunningServiceInfo;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ListView;
public class MainActivity extends Activity {
Button btnSer;
int Pointer=0;
ListView lv;
ArrayList<String> alist=new ArrayList<String>();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnSer=(Button) findViewById(R.id.btnstart);
btnSer.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
//start the service when the button is clicked
Log.e("","status of service : "+isMyServiceRunning(MyService.class));
//if(!isMyServiceRunning(MyService.class))
startService(new Intent(getApplicationContext(), MyService.class));
}
});
}
//check if the service is running
private boolean isMyServiceRunning(Class<?> serviceClass) {
ActivityManager manager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
for (RunningServiceInfo service : manager.getRunningServices(Integer.MAX_VALUE)) {
if (serviceClass.getName().equals(service.service.getClassName())) {
return true;
}
}
return false;
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
这是我的服务类。
package com.example.hello;
import java.util.Calendar;
import android.app.Service;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Handler;
import android.os.IBinder;
import android.util.Log;
import android.widget.Toast;
public class MyService extends Service{
private Handler handlerList = new Handler();
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
//TODO do something useful
Toast.makeText(getApplicationContext(), "On start command called", Toast.LENGTH_LONG).show();
return Service.START_STICKY;
}
public void updateLists(){
handlerList.postDelayed(mUpdateListTask, 1000*60);
}
private Runnable mUpdateListTask = new Runnable() {
public void run() { //will make a toast notification every 1 minute.
Calendar cal = Calendar.getInstance();
Log.e("","Thread executed at "+cal.get(Calendar.HOUR_OF_DAY)+":"+cal.get(Calendar.MINUTE)+":"+cal.get(Calendar.SECOND)+":");
Toast.makeText(getApplicationContext(), "Thread executed at "+cal.get(Calendar.HOUR_OF_DAY)+":"+cal.get(Calendar.MINUTE)+":"+cal.get(Calendar.SECOND)+":", Toast.LENGTH_LONG).show();
handlerList.postDelayed(this, 1000*60);
}};
@Override
public void onCreate() {
updateLists();
Toast.makeText(this, "Congrats! MyService Created", Toast.LENGTH_LONG).show();
Log.d("", "onCreate in service");
}
@Override
public void onStart(Intent intent, int startId) {
Toast.makeText(this, "My Service Started", Toast.LENGTH_LONG).show();
Log.d("", "onStart in service");
}
@Override
public void onDestroy() {
Toast.makeText(this, "MyService Stopped", Toast.LENGTH_LONG).show();
Log.d("", "onDestroy in service");
}
}
还在清单文件中添加了权限
<uses-permission android:name="android.permission.WAKE_LOCK" />
答案 0 :(得分:0)
在活动使用startforeground(intent name)
中将其作为前台服务启动,并在服务onstartCommand()
方法中将其作为粘性返回。