我正嘗試將iPhone應用程序移植到Android,但遇到一些啓動困難。嘗試顯示警告對話框時泄漏窗口
我有以下函數來獲取數據:
public void onClick(View v) {
try{
//Toast.makeText(getApplicationContext(), "Starting update", Toast.LENGTH_SHORT).show();
progressDialog = ProgressDialog.show(MainActivity.this, "", "Loading...");
new Thread() {
public void run() {
try{
DataManager manager = new DataManager(getApplicationContext());
manager.updateData();
} catch (Exception e) {
Log.e(TAG, e.getMessage());
AlertDialog alertDialog = new AlertDialog.Builder(MainActivity.this).create();
alertDialog.setTitle("Error...");
alertDialog.setMessage(e.getMessage());
alertDialog.show();
}
progressDialog.dismiss();
}
}.start();
} catch (Exception e) {
Log.e(TAG, "Problem with getting the data: " + e.getMessage());
Toast.makeText(getApplicationContext(), "Error during update",
Toast.LENGTH_SHORT).show();
}
}
但是,如果出現異常,我得到以下錯誤(我最初嘗試使用的AsyncTask,但遇到了同樣的問題):
08-29 20:23:24.389: ERROR/WindowManager(974): Activity org.idoms.iDomsAndroid.MainActivity has leaked window [email protected] that was originally added here
android.view.WindowLeaked: Activity org.idoms.iDomsAndroid.MainActivity has leaked window [email protected] that was originally added here
at android.view.ViewRootImpl.<init>(ViewRootImpl.java:344)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:267)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:215)
at android.view.WindowManagerImpl$CompatModeWrapper.addView(WindowManagerImpl.java:140)
at android.view.Window$LocalWindowManager.addView(Window.java:537)
at android.app.Dialog.show(Dialog.java:278)
at android.app.ProgressDialog.show(ProgressDialog.java:116)
at android.app.ProgressDialog.show(ProgressDialog.java:99)
at android.app.ProgressDialog.show(ProgressDialog.java:94)
at org.idoms.iDomsAndroid.MainActivity$1.onClick(MainActivity.java:46)
at android.view.View.performClick(View.java:3511)
at android.view.View$PerformClick.run(View.java:14105)
at android.os.Handler.handleCallback(Handler.java:605)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4424)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
at dalvik.system.NativeStart.main(Native Method)
什麼是正確的方法來做到這一點?
正如@Willie Tsang所說 - 你不能與主(UI)線程交互。返回使用'AsyncTask',如果發生錯誤,請'doInBackground(...)'返回某種'失敗'結果。這將被傳遞給'AsyncTask'的'onPostExecute(...)'方法,當它在主(UI)線程上運行時,它將能夠顯示'AlertDialog'。 – Squonk