Question

我有一个处理程序，用于在单独的类中接收SMS。如何在执行处理程序时更改视图元素？

这是我的代码：

public class MainActivity extends MapActivity {
    MapView mapView;
    MapController mc;
    GeoPoint p;
    private int carNumber;
    private String langt;
    private String longt;
    CheckedTextView text;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        SmsReceiver smsreceiver = new SmsReceiver();
                draw();
    }

    public void draw() {
        mapView = (MapView) findViewById(R.id.mapView);
        LinearLayout zoomLayout = (LinearLayout) findViewById(R.id.zoom);
        @SuppressWarnings("deprecation")
        View zoomView = mapView.getZoomControls();

        zoomLayout.addView(zoomView, new LinearLayout.LayoutParams(
            LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
        mapView.displayZoomControls(true);
        mc = mapView.getController();

        double lat = Double.parseDouble("31.977185185185185");
        double lng = Double.parseDouble("35.205925925925925");

        p = new GeoPoint((int) (lat * 1E6), (int) (lng * 1E6));

        mc.animateTo(p);
        mc.setZoom(17);
        MapOverlay mapOverlay = new MapOverlay();
        List<Overlay> listOfOverlays = mapView.getOverlays();
        listOfOverlays.clear();
        listOfOverlays.add(mapOverlay);

        mapView.invalidate();
    }
}
}

这是SMS Receiver类：

public class SmsReceiver extends BroadcastReceiver {
    MapView mapView;
    MapController mc;
    GeoPoint p;
    private int carNumber;
    private String langt;
    private String longt;
    CheckedTextView text;

    public SmsReceiver(MapView mapView) {
        this.mapView = mapView;
    }
    private static final String SMS_RECEIVED = "android.provider.Telephony.SMS_RECEIVED";

    @SuppressLint("NewApi") @Override
    public void onReceive(final Context context, final Intent intent) {
        if (intent != null && SMS_RECEIVED.equals(intent.getAction())) {
            final SmsMessage smsMessage = extractSmsMessage(intent);
            processMessage(context, smsMessage);
        }
    }

    @SuppressLint("NewApi") private SmsMessage extractSmsMessage(final Intent intent) {
        final Bundle pudsBundle = intent.getExtras();
        final Object[] pdus = (Object[]) pudsBundle.get("pdus");
        final SmsMessage smsMessage = SmsMessage.createFromPdu((byte[]) pdus[0]);

        return smsMessage;
     }
}

我想修改MapView类中的SmsReceiver。

谢谢。

Answer 1

定义一个接口并使用回调让活动知道已收到短信。

public Interface SmsReceivedListener {
    void onSmsReceived(int arg1, string arg2); ..<----add arguments you want to pass back
}

在您的短信课程中

ArrayList<SmsReceivedistener> listeners = new ArrayList<SmsReceivedistener>();

...

public void setSmsReceivedistener(SmsReceivedistenerlistener){
    listeners.add(listener);
}

收到短信时

for (SmsReceivedistener listener:listeners){
   listener.onSmsReceived(arg1, arg2);
}

在您的活动中：

public class MainActivity extends MapActivity implements SmsReceivedListener {

...

@Override
public void onCreate(Bundle savedInstanceState) 
{
    ...
    smsReceiver.setSmsReceivedistener(this);
    ...
}

public void onSmsReceived(int arg1, string arg2){
   // do whatever you need to do
}

全部来自内存所以请原谅错别字，你应该通过添加removeSmsReceivedistener并检查你没有在setSmsReceivedistener中添加两次相同的监听器来改进SMS类。

请注意。因为您使用的是界面，所以任何类（不仅仅是一个Activity）都可以实现它，以便您可以在应用中的任何位置进行更新。 smsReceiver类不知道或不关心。它只是调用监听器，如果有人注册的话。

Answer 2

将此添加到onReceive（）方法：

if (context instanceof MainActivity) {
    //modify the map 
    ((MainActivity)context).findViewById(...);
}

Answer 3

试试这个

[1] "End proc. : C:\\TimeSeries_RiskFactors\\20171119\\C0.GBMRISK.1100000156062.txt"
[1] "End proc. : C:\\TimeSeries_RiskFactors\\20171119\\C0.GBMRISK.1100000156063.txt"
[1] "End proc. : C:\\TimeSeries_RiskFactors\\20171220\\C0.GBMRISK.1100000156064.txt"
 Show Traceback

 Rerun with Debug
 Error in read.table(name, header = T, sep = "@", dec = ",", comment.char = "") : 
  duplicate 'row.names' are not allowed  

[1]"End proc. : C:\\TimeSeries_RiskFactors\\20171220\\C0.GBMRISK.1100000156065.txt"

在上面的示例中，视图bt1来自另一个类。您可以使用类实例访问bt1并获取id.Now，执行您想要的bt1实例。

注意：确保bt1在另一个类中是公开的

如何在Android中操纵另一个类的View？

3 个答案: