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我的應用程序，完美的工作沒有這部分代碼：Android的 - 動作條選項卡+對話框
if(tab.getPosition() == 4)
{
AlertDialog.Builder builder = new AlertDialog.Builder(getApplicationContext());
builder.setTitle("Alert Dialog");
builder.setMessage("This is Example of Alert Dialog with three Buttons");
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface arg0, int arg1) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(), "Ok is clicked", Toast.LENGTH_LONG).show();
}
});
builder.show();
}
就是裏面的
public void onTabSelected(Tab tab, FragmentTransaction ft) {
我有5個標籤+ 1應該只顯示對話框...當我點擊這個標籤時，我的應用會崩潰，並顯示錯誤：
11-22 14:32:00.818: E/AndroidRuntime(17853): FATAL EXCEPTION: main
11-22 14:32:00.818: E/AndroidRuntime(17853): android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application
11-22 14:32:00.818: E/AndroidRuntime(17853): at android.view.ViewRootImpl.setView(ViewRootImpl.java:797)
11-22 14:32:00.818: E/AndroidRuntime(17853): at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:288)
11-22 14:32:00.818: E/AndroidRuntime(17853): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:73)
11-22 14:32:00.818: E/AndroidRuntime(17853): at android.app.Dialog.show(Dialog.java:287)
11-22 14:32:00.818: E/AndroidRuntime(17853): at android.app.AlertDialog$Builder.show(AlertDialog.java:951)
11-22 14:32:00.818: E/AndroidRuntime(17853): at com.iecom.eresitev.WeekActivity.onTabSelected(WeekActivity.java:411)
11-22 14:32:00.818: E/AndroidRuntime(17853): at com.android.internal.app.ActionBarImpl.selectTab(ActionBarImpl.java:603)
11-22 14:32:00.818: E/AndroidRuntime(17853): at com.android.internal.app.ActionBarImpl$TabImpl.select(ActionBarImpl.java:1145)
11-22 14:32:00.818: E/AndroidRuntime(17853): at com.android.internal.widget.ScrollingTabContainerView$TabClickListener.onClick(ScrollingTabContainerView.java:658)
11-22 14:32:00.818: E/AndroidRuntime(17853): at android.view.View.performClick(View.java:4475)
11-22 14:32:00.818: E/AndroidRuntime(17853): at android.view.View$PerformClick.run(View.java:18786)
11-22 14:32:00.818: E/AndroidRuntime(17853): at android.os.Handler.handleCallback(Handler.java:730)
11-22 14:32:00.818: E/AndroidRuntime(17853): at android.os.Handler.dispatchMessage(Handler.java:92)
11-22 14:32:00.818: E/AndroidRuntime(17853): at android.os.Looper.loop(Looper.java:137)
11-22 14:32:00.818: E/AndroidRuntime(17853): at android.app.ActivityThread.main(ActivityThread.java:5419)
11-22 14:32:00.818: E/AndroidRuntime(17853): at java.lang.reflect.Method.invokeNative(Native Method)
11-22 14:32:00.818: E/AndroidRuntime(17853): at java.lang.reflect.Method.invoke(Method.java:525)
11-22 14:32:00.818: E/AndroidRuntime(17853): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1187)
11-22 14:32:00.818: E/AndroidRuntime(17853): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)
11-22 14:32:00.818: E/AndroidRuntime(17853): at dalvik.system.NativeStart.main(Native Method)
而不是使用'getApplicationContext'好心嘗試使用'this'或'WeekActivity.this'從那裏你打這個 –
？如果你正在使用一個片段，確保你在onCreateView之後調用它，一個稱爲它的好地方是onActivityCreated，你也可以用android.R.string.ok代替「Ok」。 –
@MehulJoisar哇..謝謝你。 ..應該getApplicationContext或getBaseContext的工作？如果您如此善良，並且在答案中對所有3種方法進行了一點說明，我一定會接受並回答您+1！謝謝！ –