-3

在我的按钮的 onClick 方法中，我有这段代码来显示一个带有 EditText 字段的警报对话框。但是，每次我单击按钮时，应用程序都会崩溃。我究竟做错了什么？

AlertDialog.Builder alert = new AlertDialog.Builder(mContext);
        alert.setTitle("Enter password")
             .setMessage("Enter your certificate's password");

        final EditText input = new EditText(mContext);

        alert.setView(input);

        alert.setPositiveButton("OK", new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface arg0, int arg1) {
               // code here
            }
        });

        alert.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int arg1) {
                dialog.cancel();
            }
        });

        AlertDialog alertDialog = alert.create();
        alertDialog.show();

这是日志猫：

06-06 17:00:48.810: E/com.fx.safe.android.SafeApplication(23420): Thread uncaught exception:
06-06 17:00:48.810: E/com.fx.safe.android.safeApplication(23420): android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application
06-06 17:00:48.810: E/com.fx.safe.android.safeApplication(23420):   at android.view.ViewRootImpl.setView(ViewRootImpl.java:571)
06-06 17:00:48.810: E/com.fx.safe.android.safeApplication(23420):   at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:246)
06-06 17:00:48.810: E/com.fx.safe.android.safeApplication(23420):   at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
06-06 17:00:48.810: E/com.fx.safe.android.safeApplication(23420):   at android.app.Dialog.show(Dialog.java:281)
06-06 17:00:48.810: E/com.fx.safe.android.safeApplication(23420):   at com.android.lexperts.email.activity.MessageViewFragmentBase.onImportAttachment(MessageViewFragmentBase.java:819)
06-06 17:00:48.810: E/com.fx.safe.android.safeApplication(23420):   at com.android.lexperts.email.activity.MessageViewFragmentBase.onClick(MessageViewFragmentBase.java:1030)
06-06 17:00:48.810: E/com.fx.safe.android.safeApplication(23420):   at com.android.lexperts.email.activity.MessageViewFragment.onClick(MessageViewFragment.java:431)
06-06 17:00:48.810: E/com.fx.safe.android.safeApplication(23420):   at android.view.View.performClick(View.java:4202)
06-06 17:00:48.810: E/com.fx.safe.android.safeApplication(23420):   at android.view.View$PerformClick.run(View.java:17340)
06-06 17:00:48.810: E/com.fx.safe.android.safeApplication(23420):   at android.os.Handler.handleCallback(Handler.java:725)
06-06 17:00:48.810: E/com.fx.safe.android.safeApplication(23420):   at android.os.Handler.dispatchMessage(Handler.java:92)
06-06 17:00:48.810: E/com.fx.safe.android.safeApplication(23420):   at android.os.Looper.loop(Looper.java:137)
06-06 17:00:48.810: E/com.fx.safe.android.safeApplication(23420):   at android.app.ActivityThread.main(ActivityThread.java:5039)
06-06 17:00:48.810: E/com.fx.safe.android.safeApplication(23420):   at java.lang.reflect.Method.invokeNative(Native Method)
06-06 17:00:48.810: E/com.fx.safe.android.safeApplication(23420):   at java.lang.reflect.Method.invoke(Method.java:511)
06-06 17:00:48.810: E/com.fx.safe.android.safeApplication(23420):   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
06-06 17:00:48.810: E/com.fx.safe.android.safeApplication(23420):   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
06-06 17:00:48.810: E/com.fx.safe.android.safeApplication(23420):   at dalvik.system.NativeStart.main(Native Method)
06-06 17:00:48.818: E/ACRA(23420): ACRA caught a BadTokenException exception for com.fx.safe.android. Building report.
4

1 回答 1

1

根据这个问题的答案WindowManager.BadTokenException，当您传入错误的上下文时，就会发生这种情况。

因此，将您的代码更改为：

AlertDialog.Builder alert = new AlertDialog.Builder(MyActivity.this);
[...]
final EditText input = new EditText(MyActivity.this);
于 2013-06-06T21:14:06.763 回答