Android的 - 内螺纹已经不叫尺蠖prepare无法创建处理器() [英] Android - Can't create handler inside thread that has not called Looper.prepare()
问题描述
我正在开发使用谷歌地图API V2只是为了获得基本的简单的应用程序,我面临着这样的错误:
I am developing a simple application using Google Maps V2 API just to get basics and I am facing this error:
09-09 21:21:41.154: E/AndroidRuntime(3796): FATAL EXCEPTION: Thread-441
09-09 21:21:41.154: E/AndroidRuntime(3796): java.lang.ExceptionInInitializerError
09-09 21:21:41.154: E/AndroidRuntime(3796): at cz.vongrad.dataSourceLayer.DataMapper.loadLocation(DataMapper.java:111)
09-09 21:21:41.154: E/AndroidRuntime(3796): at cz.vongrad.dataSourceLayer.DBFacade.loadLocations(DBFacade.java:32)
09-09 21:21:41.154: E/AndroidRuntime(3796): at cz.vongrad.domainLayer.Controller.loadLocations(Controller.java:94)
09-09 21:21:41.154: E/AndroidRuntime(3796): at cz.vongrad.locator.MapActivity$1.run(MapActivity.java:199)
09-09 21:21:41.154: E/AndroidRuntime(3796): Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
09-09 21:21:41.154: E/AndroidRuntime(3796): at android.os.Handler.<init>(Handler.java:121)
09-09 21:21:41.154: E/AndroidRuntime(3796): at android.os.AsyncTask$InternalHandler.<init>(AsyncTask.java:607)
09-09 21:21:41.154: E/AndroidRuntime(3796): at android.os.AsyncTask$InternalHandler.<init>(AsyncTask.java:607)
09-09 21:21:41.154: E/AndroidRuntime(3796): at android.os.AsyncTask.<clinit>(AsyncTask.java:190)
09-09 21:21:41.154: E/AndroidRuntime(3796): ... 4 more
09-09 21:21:41.164: E/EmbeddedLogger(239): App crashed!
DataMapper的:
DataMapper:
class LoadLocations extends AsyncTask<String, Void, ArrayList<Friend>>{
private JSONObject jSONObject;
@Override
protected ArrayList<Friend> doInBackground(String... args) {
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("user_name", args[1]));
jSONObject = jSONParser.makeHttpRequest(args[0], "POST", params);
Log.d(TAG, jSONObject.toString());
ArrayList<Friend> tempFriends = new ArrayList<Friend>();
try {
if(jSONObject.getInt("success") == 1){
JSONArray jsonArray = jSONObject.getJSONArray("users");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject o = jsonArray.getJSONObject(i);
tempFriends.add(new Friend(o.getString("user_name"), new LatLng(o.getDouble("loc_y"), o.getDouble("loc_x")), false));
}
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return tempFriends;
}
}
public ArrayList<Friend> loadLocation(String URL, String userName) throws InterruptedException, ExecutionException {
return new LoadLocations().execute(URL, userName).get();
}
MapActivity:
MapActivity:
public class MapActivity extends Activity implements LocationSource, LocationListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
private Thread loadFriendLocations = new Thread()
{
@Override
public void run() {
Log.d(TAG, "LastKnownLocation: " + locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER));
try {
while(true) {
controller.loadLocations(LOAD_LOCATIONS);
Log.d(TAG, "Loading new locations");
Message msg = uIHandler.obtainMessage();
msg.what = ADD_MAP_PIN;
uIHandler.sendMessage(msg);
sleep(10000);
}
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
};
final Handler uIHandler = new Handler(){
@Override
public void handleMessage(Message msg) {
if(msg.what==ADD_MAP_PIN){
for (Friend friend : controller.getFriends()) {
addMapPin(friend);
}
}
super.handleMessage(msg);
}
};
奇怪的是,我可以运行在我的模拟器(API 16),这个应用程序,它运行得很好,但是当我尝试到物理设备(API 15)上运行它,它得到这个错误。该AsyncTask的是运行在单独的类,所以它可能会导致此问题。我想AP preciate任何建议。提前致谢。
The weird thing is that I can run this app on my emulator (API 16) and it runs just great but when I try to run it on a physical device (API 15), it gets this error. The AsyncTask is run in separate class, so it might cause this problem. I would appreciate any suggestions. Thanks in advance.
推荐答案
您不能从后台线程执行的AsyncTask
。见的的AsyncTask
文档。
You cannot execute an AsyncTask
from a background thread. See the "Threading Rules" section of the AsyncTask
documentation.
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