Android 为什么我的警报对话框会崩溃
最近,我学习了一个关于如何创建警报对话框的教程,当我单击“删除”按钮时,应该会在删除之前显示警报,但它却崩溃了。有人能告诉我我的错误在哪里吗 下面是我的代码:Android 为什么我的警报对话框会崩溃,android,android-alertdialog,Android,Android Alertdialog,最近,我学习了一个关于如何创建警报对话框的教程,当我单击“删除”按钮时,应该会在删除之前显示警报,但它却崩溃了。有人能告诉我我的错误在哪里吗 下面是我的代码: // Delete button click event btnDeleteEvent.setOnClickListener(new View.OnClickListener() { public void onClick(View arg0) { // alerting user bef
// 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();
}
});
这是我的日志:
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)
尝试使用活动的上下文而不是应用程序上下文尝试使用活动的上下文而不是应用程序上下文使用对话框。dismise()甚至将getApplication上下文更改为您的活动。此 您可以参考使用dialog.disease(),甚至将getApplication上下文更改为您的Activity.this 您可以参考根据,您应该在构造函数中使用
this
而不是getApplicationContext()
public void onClick(View arg0) {
// alerting user before deleting event
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);
根据,您应该在构造函数中使用this
而不是getApplicationContext()
public void onClick(View arg0) {
// alerting user before deleting event
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);
他是对的,更准确地说是AlertDialog.Builder alertDialogBuilder=new AlertDialog.Builder(ouractivity.this);嗯,这不应该是你的活动吗。这?非常感谢你对人们的帮助!他是对的,更准确地说是AlertDialog.Builder alertDialogBuilder=new AlertDialog.Builder(ouractivity.this);嗯,这不应该是你的活动吗。这?非常感谢你对人们的帮助!