我有一个静态 AsyncTask
并且我需要获取上下文,我该怎么做才能获取它?
我尝试使用WeakReference
,例如:
private WeakReference<ScanActivity> activityReference;
FetchPositionAsyncTask(ScanActivity context) {
activityReference = new WeakReference<>(context);
}
但是 Android Studio 说:
Geocoder (android.content.Context, Locale) in Geocoder cannot be applied to (java.lang.ref.WeakReference, Locale)
这是我的代码:
private static class FetchPositionAsyncTask extends AsyncTask<String, Void, String> {
private WeakReference<ScanActivity> activityReference;
FetchPositionAsyncTask(ScanActivity context) {
activityReference = new WeakReference<>(context);
}
@Override
protected String doInBackground(String... params) {
return null;
}
protected void onPostExecute(String result) {
//TODO da mettere in doInBackground
final AlertDialog.Builder builder;
//GET ADDRESS FROM COORDINATES
Geocoder geocoder = new Geocoder(activityReference, Locale.getDefault());
try {
DATA_LOCALITY = geocoder.getFromLocation(latitude, longitude, 1);
} catch (IOException e) {
e.printStackTrace();
}
String DATA_ADDRESS = DATA_LOCALITY.get(0).getAddressLine(0);
//TEST
builder = new AlertDialog.Builder(activityReference.this);
builder.setTitle("").setMessage("Latitude: " + latitude + " " + "Longitude: " + longitude + " " + "Accuracy: " + accuracy + " " + "Address: " + DATA_ADDRESS).setNeutralButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
}).show().setCanceledOnTouchOutside(false);
}
}
这是我设置代码的方法:
Geocoder geocoder = new Geocoder(activityReference, Locale.getDefault());
builder = new AlertDialog.Builder(activityReference);
最佳答案
您需要使用activityReference.get()
来使用引用变量中的Context
。
关于java - Android - 静态嵌套类(上下文),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/56164669/