我有一个在单独的类中接收SMS的处理程序,如何在处理程序执行时更改视图元素?如何操作Android中另一个类的视图?
这里是我的代码:
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();
}
}
}
这里是SMS接收器类
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SMSReceiver类中的地图视图。
谢谢。
这听起来不错,但有一个问题,即时通讯,当我第一次通过听者不为空,但是当的onReceive处理程序被调用时,听众证明为空是怎么回事? –
请发布代码。 – Simon
亲爱的西蒙,代码是在这个链接http://stackoverflow.com/questions/14396829/android-reference-to-activity-object-in-another-class-becomes-null –