我对由 PhoneStateListener 启动时的服务行为有疑问。
我的客户想要一个安全软件来跟踪被盗设备。我正在编写的功能在按下 SEND 按钮时拍照。
所以我写了一个广播接收器注册一个PhoneStateListener。此侦听器启动一项服务,以在没有预览的情况下从正面摄像头拍照。问题在于时机。该服务在图片可用之前被杀死!但是为什么服务会被 SO 杀死?
通过广播接收器:
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.telephony.PhoneStateListener;
import android.telephony.TelephonyManager;
public class PhoneReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
ATMPhoneStateListener phoneListener=new ATMPhoneStateListener(context);
TelephonyManager telephony = (TelephonyManager)context.getSystemService(Context.TELEPHONY_SERVICE);
telephony.listen(phoneListener,PhoneStateListener.LISTEN_CALL_STATE);
}
}
PhoneStateListener:
import android.telephony.PhoneStateListener;
import android.telephony.TelephonyManager;
import android.content.Context;
import android.content.Intent;
import java.lang.reflect.Method;
import android.os.IBinder;
import android.os.Binder;
import com.my.services.TakePictureService;
public class MyPhoneStateListener extends PhoneStateListener {
private Context context;
public MyPhoneStateListener (Context context) {
this.context = context;
}
public void onCallStateChanged(int state, String incomingNumber){
switch(state)
{
case TelephonyManager.CALL_STATE_IDLE:
break;
case TelephonyManager.CALL_STATE_OFFHOOK:
phoneIsOffHeek();
break;
case TelephonyManager.CALL_STATE_RINGING:
break;
}
}
@SuppressWarnings({ "rawtypes", "unchecked" })
private void phoneIsOffHeek() {
Intent takePictureService = new Intent(context, TakePictureService.class);
context.startService(takePictureService);
}
}
服务:
import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Date;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.os.Environment;
import android.os.IBinder;
public class TakePictureService extends Service {
private Context context;
@Override
public IBinder onBind(Intent arg0) {
return null;
}
@Override
public void onCreate() {
super.onCreate();
context = this.getApplicationContext();
}
@Override
public void onStart(Intent intent, int startId) {
super.onStart(intent, startId);
if (GBCameraUtil.findFrontFacingCamera() != -1) {
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyymmDDhhmmss");
String date = dateFormat.format(new Date());
final String fileName = Environment.getExternalStorageDirectory().getAbsolutePath() + "/" + date + ".jpg";
GBTakePictureNoPreview c = new GBTakePictureNoPreview(context, this);
c.setUseFrontCamera(true);
c.setFileName(fileName);
if (c.cameraIsOk()) {
try {
c.takePicture();
} catch (Exception e) {
}
}
} else {
stopSelf();
}
}
权限没问题,代码有时工作有时不工作,因为服务被杀死了。
有任何想法吗?