创建 AlertDialog 实例后应用程序已停止错误

Question

我有一个包含一些 classes 的项目。

扩展 Activity 的一个 class 有一个按钮。这是class.

的onCreate方法

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.select_car);
/////// some codes and behaviors here

直到我找到一个作用于按钮的方法。
单击按钮时，一些数据将插入到我的数据库中，但在此之前，我想得到最终用户的确认，确认他选择的内容是否已更正。
首先，我只想设置一个肯定的答案，这是我在那个特定按钮中所做的。

            choose.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
//i want to get Confirm from end user, so i did this
                final AlertDialog.Builder builder = new AlertDialog.Builder(getApplication());
                builder.setMessage("Are You Sure To do this?")
                        .setTitle("Alert");
                builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                    }
                });
AlertDialog dialog = builder.create();

// some data Insert into my DB 
    }
            });

当我运行我的项目并实现此 class 时，我在 Android 设备中遇到此错误：

Unfortunately "MyApplicationName" has stopped.

以及来自 android-studio

的日志

10-22 18:36:17.910  14478-14478/com.theonlyone.behtakapp E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: com.theonlyone.behtakapp, PID: 14478
    android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application
            at android.view.ViewRootImpl.setView(ViewRootImpl.java:660)
            at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:261)
            at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
            at android.app.Dialog.show(Dialog.java:286)
            at android.app.AlertDialog$Builder.show(AlertDialog.java:951)
            at com.theonlyone.behtakapp.Car.onClick(Car.java:306)
            at android.view.View.performClick(View.java:4470)
            at android.view.View$PerformClick.run(View.java:18796)
            at android.os.Handler.handleCallback(Handler.java:808)
            at android.os.Handler.dispatchMessage(Handler.java:103)
            at android.os.Looper.loop(Looper.java:193)
            at android.app.ActivityThread.main(ActivityThread.java:5299)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:825)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:641)
            at dalvik.system.NativeStart.main(Native Method)

我该怎么办？

Answer 1

$BadTokenException: Unable to add window -- token null is not for an application

因为在 AlertDialog.Builder 中使用 getApplication() 传递应用程序上下文。

要显示来自当前 Activity 的警报，即运行在 AlertDialog.Builder

中传递 Car.this 或 v.getContext()

Answer 2

应该是这样的

   choose.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
//i want to get Confirm from end user, so i did this
                    final AlertDialog.Builder builder = new AlertDialog.Builder(getApplicationContext());
                    builder.setMessage("Are You Sure To do this?")
                           .setTitle("Alert");
                    builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            // some data Insert into my DB 
                        }
                    });
                    builder.show();
                }
        });

创建 AlertDialog 实例后应用程序已停止错误

Applicaton has stopped error after create instance of AlertDialog

java

android

android-alertdialog

android-studio