Gau*_*ora 5 android textview android-asynctask google-maps-android-api-2
我想更新 aynctask 中的 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;
}
}
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XML 文件(膨胀的一个)
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.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>
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这是我从主要活动中调用 Asyntask 的方式
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, null);
new LocateGeopoint(v).execute(marker.getPosition());
return v;
}
});
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当我调试应用程序时,它会更新,但通常不会更新。
在代码中添加缓存InfoWindowAdapter并修改其getInfoContents()方法来检查它:
googleMap.setInfoWindowAdapter(new InfoWindowAdapter() {\n LruCache<Marker, View> cache = new LruCache<Marker, View>(8); // added\n\n // no change to getInfoWindow()\n\n @SuppressWarnings("unchecked")\n @Override\n public View getInfoContents(Marker marker) {\n View v = cache.get(marker);\n if (v == null) {\n LayoutInflater inflater = (LayoutInflater) MapsDemo.this\n .getSystemService(Context.LAYOUT_INFLATER_SERVICE);\n v = inflater.inflate(R.layout.custom_info, null);\n new LocateGeopoint(v, marker).execute(marker.getPosition());\n cache.put(marker, v);\n }\n return v;\n }\n });\nRun Code Online (Sandbox Code Playgroud)\n\n调整类中的代码LocateGeopoint,添加对 的引用并在更新 TextView 后Marker调用。showInfoWindow()
public class LocateGeopoint extends AsyncTask<LatLng, String, List<Address>> {\n\n // :\n Marker marker; // added\n\n public LocateGeopoint(View v, Marker marker) {\n // :\n this.marker = marker; // added\n }\n\n @Override\n protected void onPostExecute(List<Address> addresses) {\n super.onPostExecute(addresses);\n if(addresses!=null){\n // :\n tv.setText(city);\n marker.showInfoWindow(); // added\n }\n }\n\n // no change to doInBackground()\n}\nRun Code Online (Sandbox Code Playgroud)\n\n注意:这个答案实际上只是一个快速而肮脏的实现(我没有真正测试过它,但我认为它应该有效),基于 MaciejG\xc3\xb3rski 关于这个问题的答案,请阅读其中引用的帖子回答以获取更多详细信息:)
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