android - 在 Android 中创建 AlertDialog

Question

我正在尝试创建警报对话框，但是当我单击按钮时，我的应用程序崩溃了。知道发生了什么吗？我该如何解决？

代码如下:

    Button deactivate = (Button) findViewById(R.id.deactivate);
    deactivate.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            new AlertDialog.Builder( MyCollectionId.this )
            .setTitle( "Invalid selection" )
            .setMessage( "Drbr" )
            .setPositiveButton( "Confirm", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int which) {
                    Log.d("AlertDialog", "Positive");
                }
            })
            .setNegativeButton( "Cancel", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int which) {
                    Log.d("AlertDialog","Negative");
                }
            })
            .show();    

        }

    });

登录目录:

08-08 11:51:39.794: ERROR/AndroidRuntime(551): Uncaught handler: thread main exiting due to uncaught exception
08-08 11:51:39.824: ERROR/AndroidRuntime(551): android.view.WindowManager$BadTokenException: Unable to add window -- token android.app.LocalActivityManager$LocalActivityRecord@44c1d9f0 is not valid; is your activity running?
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.ViewRoot.setView(ViewRoot.java:468)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:177)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.Window$LocalWindowManager.addView(Window.java:424)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.app.Dialog.show(Dialog.java:239)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.app.AlertDialog$Builder.show(AlertDialog.java:802)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at com.stampii.stampii.mystampii.MyCollectionId$3.onClick(MyCollectionId.java:67)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.View.performClick(View.java:2364)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.View.onTouchEvent(View.java:4179)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.widget.TextView.onTouchEvent(TextView.java:6541)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.View.dispatchTouchEvent(View.java:3709)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1659)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1107)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.app.Activity.dispatchTouchEvent(Activity.java:2061)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1643)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1659)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1107)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.app.Activity.dispatchTouchEvent(Activity.java:2061)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1643)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:884)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1659)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1107)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.app.Activity.dispatchTouchEvent(Activity.java:2061)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1643)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.view.ViewRoot.handleMessage(ViewRoot.java:1691)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.os.Handler.dispatchMessage(Handler.java:99)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.os.Looper.loop(Looper.java:123)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at android.app.ActivityThread.main(ActivityThread.java:4363)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at java.lang.reflect.Method.invokeNative(Native Method)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at java.lang.reflect.Method.invoke(Method.java:521)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
08-08 11:51:39.824: ERROR/AndroidRuntime(551):     at dalvik.system.NativeStart.main(Native Method)

提前致谢!

Answer 1

这一行:

 new AlertDialog.Builder( MyCollectionId.this )

正在为您的对话框设置上下文以附加到 Activity 。

你要么需要使用

 YourActivity.this

 new AlertDialog.Builder( YourActivity.this )

或者将上下文设置为一个变量并使用它:

 Context mContext;

 onCreate(){
   mContext = this;
 }

 yourOnClick{
   new AlertDialog.Builder( mContext )
 }

如果这不是您的问题，您需要围绕您的问题提供更多“上下文”，您是从哪个 Activity 调用对话框的，您处于什么 Activity 状态。