[英]Why does my alert dialog crash
最近,我遵循了有關如何創建警報對話框的教程,當我單擊刪除按鈕時,它應該在刪除之前向我顯示警報,但崩潰了。 有人可以告訴我我的錯誤在哪里嗎?
下面是我的代碼:
// Delete button click event
btnDeleteEvent.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
// alerting user before deleting event
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
getApplicationContext());
// set title
alertDialogBuilder.setTitle("Warning!");
// set dialog message
alertDialogBuilder
.setMessage("Are you sure to delete event?")
.setCancelable(false)
.setPositiveButton("Yes",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int id) {
// if yes, deleting event in background
// thread
new DeleteEvent().execute();
}
})
.setNegativeButton("No",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int id) {
// if this button is clicked, just close
// the dialog box and do nothing
dialog.cancel();
}
});
// create alert dialog
AlertDialog alertDialog = alertDialogBuilder.create();
// show it
alertDialog.show();
}
});
這是我的日志:
08-18 02:02:45.804: E/AndroidRuntime(1288): FATAL EXCEPTION: main
08-18 02:02:45.804: E/AndroidRuntime(1288): android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application
08-18 02:02:45.804: E/AndroidRuntime(1288): at android.view.ViewRoot.setView(ViewRoot.java:509)
08-18 02:02:45.804: E/AndroidRuntime(1288): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:177)
08-18 02:02:45.804: E/AndroidRuntime(1288): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
08-18 02:02:45.804: E/AndroidRuntime(1288): at android.app.Dialog.show(Dialog.java:241)
08-18 02:02:45.804: E/AndroidRuntime(1288): at com.stts.sparetimetradingsystem.employer.EditEventActivity$5.onClick(EditEventActivity.java:270)
08-18 02:02:45.804: E/AndroidRuntime(1288): at android.view.View.performClick(View.java:2408)
08-18 02:02:45.804: E/AndroidRuntime(1288): at android.view.View$PerformClick.run(View.java:8816)
08-18 02:02:45.804: E/AndroidRuntime(1288): at android.os.Handler.handleCallback(Handler.java:587)
08-18 02:02:45.804: E/AndroidRuntime(1288): at android.os.Handler.dispatchMessage(Handler.java:92)
08-18 02:02:45.804: E/AndroidRuntime(1288): at android.os.Looper.loop(Looper.java:123)
08-18 02:02:45.804: E/AndroidRuntime(1288): at android.app.ActivityThread.main(ActivityThread.java:4627)
08-18 02:02:45.804: E/AndroidRuntime(1288): at java.lang.reflect.Method.invokeNative(Native Method)
08-18 02:02:45.804: E/AndroidRuntime(1288): at java.lang.reflect.Method.invoke(Method.java:521)
08-18 02:02:45.804: E/AndroidRuntime(1288): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
08-18 02:02:45.804: E/AndroidRuntime(1288): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
08-18 02:02:45.804: E/AndroidRuntime(1288): at dalvik.system.NativeStart.main(Native Method)
嘗試使用活動的上下文而不是應用程序上下文
使用dialog.dismiss()甚至將getApplication上下文更改為YourActivity.this
您可以參考http://codinglookseasy.blogspot.in/2012/07/alert-box-code.html
根據這個相關的問題 ,您應該在構造函數中使用this
而不是getApplicationContext()
。
public void onClick(View arg0) {
// alerting user before deleting event
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);
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