android – 当我的应用程序失去焦点并重新获得焦点时,UI会更新.奇怪的问题

我想在aynctask中更新我的textView,但它根本没有更新.我无法找出我的错误.

这是我的代码：

注意： – 当我的应用程序失去焦点并重新获得焦点时,UI会更新.奇怪的问题

public class LocateGeopoint extends AsyncTask<LatLng,String,List<Address>> {

    Geocoder geocoder;
    private TextView tv;

    public LocateGeopoint(View v) {
        this.geocoder = new Geocoder(v.getContext());
        this.tv = (TextView) v.findViewById(R.id.textView1);
    }

    @Override
    protected void onPostExecute(List<Address> addresses) {
        super.onPostExecute(addresses);
        if(addresses!=null){
            String city = addresses.get(0).getAddressLine(0);
            String country = addresses.get(0).getAddressLine(1);
            System.out.println(city+"  "+country);

            tv.setText(city);

        }
    }

    @Override
    protected List<Address> doInBACkground(LatLng... params) {
        // TODO Auto-generated method stub
        double lattitude = params[0].latitude;
        double longitude = params[0].longitude;

        List<Address> addresses = null;
        if (lattitude != 0 || longitude != 0) {

            try {
                addresses = geocoder.getFromLOCATIOn(lattitude,longitude,1);
            } catch (IOException E) {
                e.printStackTrace();
            }
        }
        return addresses;
    }

}

XML文件(膨胀的一个)

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://scheR_539_11845@as.android.com/apk/res/android"
    android:id="@+id/parent_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal" >

    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/ic_launcher" />

    <FrameLayout
        android:id="@+id/view_container"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" >

        <TextView
            android:id="@+id/textView1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:focusable="true"
           android:text="Loading Address.." />

    </FrameLayout>

以下是我从主要活动中调用Asyntask的方法

googleMap.seTinfoWindowAdapter(new InfoWindowAdapter() {

            @Override
            public View geTinfoWindow(Marker arg0) {
                return null;
            }

            @SuppressWarnings("unchecked")
            @Override
            public View geTinfoContents(Marker marker) {
                LayoutInflater inflater = (LayoutInflater) MapsDemo.this
                        .getSystemservice(Context.LAYOUT_INFLATER_serviCE);
                View v =  inflater.inflate(R.layout.custom_info,@R_616_6633@
                new LocateGeopoint(v).execute(marker.getPosition());
                return v;
            }
        });

当我调试应用程序时,它会更新但通常不会.

googleMap.seTinfoWindowAdapter(new InfoWindowAdapter() {
        LruCache<Marker,View> cache = new LruCache<Marker,View>(8); // added

        // no change to geTinfoWindow()

        @SuppressWarnings("unchecked")
        @Override
        public View geTinfoContents(Marker marker) {
            View v = cache.get(marker);
            if (v == null) {
                LayoutInflater inflater = (LayoutInflater) MapsDemo.this
                        .getSystemservice(Context.LAYOUT_INFLATER_serviCE);
                v =  inflater.inflate(R.layout.custom_info,@R_616_6633@
                new LocateGeopoint(v,marker).execute(marker.getPosition());
                cache.put(marker,v);
            }
            return v;
        }
    });

public class LocateGeopoint extends AsyncTask<LatLng,List<Address>> {

    // :
    Marker marker; // added

    public LocateGeopoint(View v,Marker marker) {
        // :
        this.marker = marker; // added
    }

    @Override
    protected void onPostExecute(List<Address> addresses) {
        super.onPostExecute(addresses);
        if(addresses!=null){
            // :
            tv.setText(city);
            marker.showInfoWindow(); // added
        }
    }

    // no change to doInBACkground()
}