Question

我是android新手。我正在使用报警管理器。当用户按下后退按钮时，我想停止警报管理器并停止使用GPSService。我尝试了这个，但我的应用程序也在后台运行。这是我的代码。请帮帮我

  public class MainActivity2 extends AppCompatActivity {

TextView tv_latitude, tv_longitude;
private Toolbar toolbar;
GoogleMap map;
LatLng dest;
GPSService mGPSService;
private PendingIntent pendingIntent;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main2);
    toolbar = (Toolbar) findViewById(R.id.app_bar);
    toolbar.setTitle("Welcome");
    setSupportActionBar(toolbar);
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    tv_latitude = (TextView) findViewById(R.id.latitude);
    tv_longitude = (TextView) findViewById(R.id.longitude);

    Intent alarmIntent = new Intent(MainActivity2.this, AlarmReceiver.class);
    pendingIntent = PendingIntent.getBroadcast(MainActivity2.this, 0, alarmIntent, 0);
    startAlarm();

    mGPSService = new GPSService(MainActivity2.this);
    mGPSService.getLocation();

    if (mGPSService.isLocationAvailable == false) {

        // Here you can ask the user to try again, using return; for that
        Toast.makeText(MainActivity2.this, "Your location is not available", Toast.LENGTH_SHORT).show();
        return;

        // Or you can continue without getting the location, remove the return; above and uncomment the line given below
        // address = "Location not available";
    } else {

        // Getting location co-ordinates
        double latitude = mGPSService.getLatitude();
        double longitude = mGPSService.getLongitude();

        tv_longitude.setText("" + longitude);
        tv_latitude.setText("" + latitude);
        dest = new LatLng(latitude, longitude);

        SupportMapFragment supportMapFragment = (SupportMapFragment) getSupportFragmentManager()
                .findFragmentById(R.id.map);
        map = supportMapFragment.getMap();
        map.setMyLocationEnabled(true);
        map.addMarker(new MarkerOptions().position(dest));
        map.moveCamera(CameraUpdateFactory.newLatLng(dest));
        map.animateCamera(CameraUpdateFactory.zoomTo(18));
    }
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
        case android.R.id.home:
            Log.e("Home back pressed", "called");
            mGPSService.closeGPS();
            AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);

            Intent updateServiceIntent = new Intent(MainActivity2.this, AlarmReceiver.class);
            PendingIntent pendingUpdateIntent = PendingIntent.getService(MainActivity2.this, 0, updateServiceIntent, 0);

            // Cancel alarms
            try {
                alarmManager.cancel(pendingUpdateIntent);
            } catch (Exception e) {

            }
            Log.e("Home back pressed end", "called");
            finish();
            return true;
        default:
            return super.onOptionsItemSelected(item);
    }
}

@Override
public void onBackPressed() {
    super.onBackPressed();
    Log.e("back presed called", "clalles");
    mGPSService.closeGPS();
    AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);

    Intent updateServiceIntent = new Intent(MainActivity2.this, AlarmReceiver.class);
    PendingIntent pendingUpdateIntent = PendingIntent.getService(MainActivity2.this, 0, updateServiceIntent, 0);

    // Cancel alarms
    try {
        alarmManager.cancel(pendingUpdateIntent);
    } catch (Exception e) {

    }
    Log.e("back presed endd", "clalles");
}

public void startAlarm() {
    AlarmManager manager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);

    /* Repeating on every 20 minutes interval */
    manager.setRepeating(AlarmManager.RTC_WAKEUP, 0,
            10 * 60 * 20, pendingIntent);
    //   Toast.makeText(this, "Alarm Set", Toast.LENGTH_SHORT).show();
}

@Override
protected void onResume() {

    super.onResume();
    // Other onResume() code here
    this.registerReceiver(mMessageReceiver, new IntentFilter("some_unique_name"));
}

@Override
protected void onPause() {
    super.onPause();
    this.unregisterReceiver(mMessageReceiver);
    // Other onPause() code here
}

private BroadcastReceiver mMessageReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {

        double lat = intent.getDoubleExtra("lat", 0);
        double longg = intent.getDoubleExtra("long", 0);
        tv_latitude.setText("" + lat);
        tv_longitude.setText("" + longg);
        Log.e("Broadcast Receiver lat", "" + lat);
        Log.e("Broadcast Receiver long", "" + longg);
        map.clear();

        dest = new LatLng(lat, longg);
        SupportMapFragment supportMapFragment = (SupportMapFragment) getSupportFragmentManager()
                .findFragmentById(R.id.map);
        map = supportMapFragment.getMap();
        map.setMyLocationEnabled(true);
        map.addMarker(new MarkerOptions().position(dest));
        map.moveCamera(CameraUpdateFactory.newLatLng(dest));
        map.animateCamera(CameraUpdateFactory.zoomTo(18));
        //update the TextView
        // Toast.makeText(context, "Alarm Settttttttt", Toast.LENGTH_SHORT).show();
    }
};
}

这是AlarmReceiver类

 public class AlarmReceiver extends BroadcastReceiver {
GPSService gps;

@Override
public void onReceive(Context context, Intent intent) {

    updateYourActivity(context);
}

private void updateYourActivity(Context context) {

    Intent intent = new Intent("some_unique_name");
    gps = new GPSService(context);
    gps.getLocation();

    if (gps.isLocationAvailable == false) {

        Toast.makeText(context, "Your location is not available, please try again.", Toast.LENGTH_SHORT).show();
        return;

    } else {
        double latitude = gps.getLatitude();
        double longitude = gps.getLongitude();
        intent.putExtra("lat", latitude);
        intent.putExtra("long", longitude);

        context.sendBroadcast(intent);
    }

}

}

Answer 1

下面：

PendingIntent pendingUpdateIntent = PendingIntent.getService(
                      MainActivity2.this, 0, updateServiceIntent, 0);

PendingIntent.getService方法检索将启动服务的PendingIntent

但是AlarmReceiver正在延长BroadcastReceiver所以需要使用PendingIntent.getBroadcast来检索将执行广播的PendingIntent

像：

PendingIntent pendingUpdateIntent = PendingIntent.getBroadcast(
                          MainActivity2.this, 0, updateServiceIntent, 0);

警报管理器和gps服务没有停止

1 个答案: