我有一个应用程序，它从启动接收器启动一项服务，该服务会定期从手机的 Sqlite DB 上的表中删除行。BootReceiver 工作正常。它实例化的服务有一个无限循环，该循环由 Thread.sleep 暂停 30 秒（用于测试），最终它将设置为每隔几个小时左右。它确实删除了行，但我不相信它是每 30 秒一次，并且最终它会导致 ANR。这一切的实现方式似乎有点粗糙。有没有更好的方法来实现我正在做的事情？如果不是，我怎么能停止 ANR，因为我认为服务不必是异步的，只需网络调用等。
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
public class MyBootReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
Intent myIntent = new Intent(context, SendOutstandingTransactions.class);
myIntent.setAction("com.carefreegroup.startatboot.MyService");
context.startService(myIntent);
}
}
import org.joda.time.DateTime;
import android.app.Service;
import android.content.Intent;
import android.database.Cursor;
import android.os.IBinder;
import android.util.Log;
public class SendOutstandingTransactions extends Service {
private static final String TAG = SendOutstandingTransactions.class.getSimpleName();
NfcScannerApplication nfcscannerapplication;
Cursor c;
@Override
public void onCreate() {
Log.e(TAG, "inside onCreate of SendOutstandingTransactions");
nfcscannerapplication = (NfcScannerApplication)getApplication();
super.onCreate();
}
@Override
public void onDestroy() {
Log.e(TAG, "inside onDestroy of SendOutstandingTransactions");
super.onDestroy();
}
@Override
public void onStart(Intent intent, int startId) {
super.onStart(intent, startId);
Log.e(TAG, "inside onStart of SendOutstandingTransactions");
do{
DateTime now = new DateTime();
//nfcscannerapplication.loginValidate.deleteTransactionsOlderThanThreeDays(now);
nfcscannerapplication.loginValidate.deleteTableTransactions();
Log.e(TAG, "just called housekeeping method in service");
try {
Thread.sleep(30000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}while(true);
}// end of onStart
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
}
AndroidManifest 文件：
<service android:name=".SendOutstandingTransactions" >
<intent-filter>
<action android:name="com.carefreegroup.startatboot.MyService" />
</intent-filter>
</service>
<receiver
android:name=".MyBootReceiver"
android:enabled="true"
android:exported="false" >
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
</intent-filter>
</receiver>
我如何启动服务
// get a Calendar object with current time
Calendar cal = Calendar.getInstance();
// add 5 minutes to the calendar object
cal.add(Calendar.MINUTE, 1);
Intent intent = new Intent(getApplicationContext(), AlarmReceiver.class);
intent.putExtra("alarm_message", "sending outstanding transactions");
// In reality, you would want to have a static variable for the request code instead of 192837
PendingIntent sender = PendingIntent.getBroadcast(getApplicationContext(), 192837, intent, PendingIntent.FLAG_UPDATE_CURRENT);
// Get the AlarmManager service
AlarmManager am = (AlarmManager) getSystemService(ALARM_SERVICE);
//am.set(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), sender);
//86400000 = 24 hours
//43200000 = 12 hours
//3600000 = 1hr
//1800000 = 30 mins
// 600000 = 10 mins
//300000 = 5 mins
am.setRepeating(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), 300000 , sender);
警报接收器：
public class AlarmReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
try {
Bundle bundle = intent.getExtras();
String message = bundle.getString("alarm_message");
// Toast.makeText(context, message, Toast.LENGTH_SHORT).show();
Intent myIntent = new Intent(context, SendOutstandingTransactions.class);
myIntent.setAction("com.carefreegroup.rr3.startatboot.MyService");
context.startService(myIntent);
} catch (Exception e) {
Toast.makeText(context, "There was an error somewhere, but we still received an alarm", Toast.LENGTH_SHORT).show();
e.printStackTrace();
}
}
}
服务：
public class SendOutstandingTransactions extends IntentService {
private static final String TAG = SendOutstandingTransactions.class.getSimpleName();
instance variables
@Override
public void onCreate() {
super.onCreate();
}
@Override
protected void onHandleIntent(Intent intent) {
//do something
}//end of onHandleIntent
public SendOutstandingTransactions() {
super("SendOutstandingTransactions");
}