Question

我正在尝试创建一个Android应用程序，其范围为用户给出的区域中的信标。问题是，当我添加距离约束并返回 mainactivity 时，应用程序也会显示上一个测距实例。

例如：

当我将距离改为5米时，距离的默认值为10米，它仍然显示相距10米的信标。如果我将距离的值更改为2m，我将会显示5m范围的实例和10m范围的实例。

MAINACTIVITY

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    int id = item.getItemId();

    if(id == R.id.settings) {
        try {
            beaconManager.stopRangingBeaconsInRegion(new Region("myRangingUniqueId", null, null, null));
            beaconManager.unbind(this);
            Log.w(TAG,"Stopped ranging");
        } catch (RemoteException e) {
            e.printStackTrace();
        }
        startActivity(new Intent(MainActivity.this, Settings.class));

    }

    return true;
}

在oncreate中

变量距离

SharedPreferences sharedPref = getApplication().getSharedPreferences("Settings",Context.MODE_PRIVATE);
distance = sharedPref.getFloat("distance",10.0f);

测距功能

  @Override
public void onBeaconServiceConnect() {

    //beacon ranging


    beaconManager.addRangeNotifier(new RangeNotifier() {

        @Override
        public void didRangeBeaconsInRegion(Collection<Beacon> beacons, Region region) {

            if (beacons.size() > 0) {
                for (Beacon beacon : beacons) {
                    if(beacon.getDistance()<= distance) {
                        Log.i(TAG,beacon.getBluetoothName());
                        Log.i(TAG,String.valueOf(distance));                      
                    }

                }
            }

        }

    });


    try {
        beaconManager.startRangingBeaconsInRegion(new Region("myRangingUniqueId", null, null, null));
    } catch (RemoteException e) {    }
}

设置

Button button;
EditText distance;
Float distanceValue;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_settings);
    setTitle("Settings");
    SharedPreferences sharedPref = getApplication().getSharedPreferences("Settings",Context.MODE_PRIVATE);
    final SharedPreferences.Editor editor = sharedPref.edit();
    button = (Button) findViewById(R.id.button);
    distance = (EditText) findViewById(R.id.distanceValue);
    button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            if(distance.getText().toString().isEmpty()){
                distance.requestFocus();
                distance.setError("Required");
            }
            else{
                distanceValue = Float.valueOf(distance.getText().toString());
                editor.putFloat("distance",distanceValue);
                editor.commit();
                startActivity(new Intent(Settings.this,MainActivity.class));

            }
        }
    });

LOG

之前的

06-28 14:54:21.724 13866-18103/com.example.beaconscanner I/MonitoringActivity: proxiteeMini_00037
06-28 14:54:21.724 13866-18103/com.example.beaconscanner I/MonitoringActivity: 10.0
06-28 14:54:21.732 13866-18103/com.example.beaconscanner I/MonitoringActivity: proxiteeMini_00035
06-28 14:54:21.732 13866-18103/com.example.beaconscanner I/MonitoringActivity: 10.0

后的

06-28 14:56:37.778 13866-18103/com.example.beaconscanner I/MonitoringActivity: proxiteeMini_00035
06-28 14:56:37.778 13866-18103/com.example.beaconscanner I/MonitoringActivity: 5.0
06-28 14:56:37.788 13866-18103/com.example.beaconscanner I/MonitoringActivity: proxiteeMini_00035
06-28 14:56:37.788 13866-18103/com.example.beaconscanner I/MonitoringActivity: 5.0
06-28 14:56:37.801 13866-18103/com.example.beaconscanner I/MonitoringActivity: proxiteeMini_00037
06-28 14:56:37.801 13866-18103/com.example.beaconscanner I/MonitoringActivity: 10.0

proxiteeMini_00037在10米范围内

proxiteeMini_00035在5米范围内

Answer 1

我怀疑你有多个MainActivity实例同时运行。 MainActivity的旧实例具有旧的距离值，而新的实例具有新值。创建从SettingsActivity返回MainActivity的意图将导致此问题。您可以通过使用this.finish();

退出SettingsActivity来解决此问题

Android - 无法停止测距信标

1 个答案: