对话显示问题

Question

我正在测试回答我的问题的代码：

remove line between custom option menu items

与此相关的答案：

我正在尝试通过将此代码添加到WidgetMenu类来按反馈时触发对话框，但它让我强制关闭，我添加了代码：

  public void onClick(View arg0) {       
        final Dialog dialog = new Dialog(context);
        dialog.setContentView(R.layout.custom_dialog);
        dialog.setTitle("Title...");

        // set the custom dialog components - text, image and button
        TextView text = (TextView) dialog.findViewById
                           (R.id.dialog_text);
        text.setText("Places contact me");

        ImageView image = (ImageView) dialog.findViewById(R.id.image);
        image.setImageResource(R.drawable.ic_launcher);

    Button dialogButton = (Button) dialog.findViewById(R.id.dialog_Button);
        // if button is clicked, close the custom dialog
        dialogButton.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                dialog.dismiss();
            }
        });

        dialog.show();
      }
    });

我的logcat：

  W/KeyCharacterMap(303): No keyboard for id 0
  W/KeyCharacterMap(303): Using default keymap: /system/usr/keychars/qwerty.kcm.bin
  D/dalvikvm(303): GC_EXTERNAL_ALLOC freed 932 objects / 65328 bytes in 90ms
  D/AndroidRuntime(303): Shutting down VM
  W/dalvikvm(303): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
  E/AndroidRuntime(303): FATAL EXCEPTION: main
  E/AndroidRuntime(303): java.lang.NullPointerException
  E/AndroidRuntime(303): at android.app.Dialog.<init> (Dialog.java:141)
  E/AndroidRuntime(303): at android.app.Dialog.<init> (Dialog.java:123)
  E/AndroidRuntime(303): at com.tsn.dr.WidgetMenu$Ui$2.onClick (WidgetMenu.java:99)
  E/AndroidRuntime(303): at android.view.View.performClick (View.java:2408)
  E/AndroidRuntime(303): at android.view.View$PerformClick.run (View.java:8816)
  E/AndroidRuntime(303): at android.os.Handler.handleCallback (Handler.java:587)
  E/AndroidRuntime(303): at android.os.Handler.dispatchMessage (Handler.java:92)
  E/AndroidRuntime(303): at android.os.Looper.loop(Looper.java:123)
  E/AndroidRuntime(303): at android.app.ActivityThread.main (ActivityThread.java:4627)
  E/AndroidRuntime(303): at java.lang.reflect.Method.invokeNative (Native Method)
  E/AndroidRuntime(303): at java.lang.reflect.Method.invoke (Method.java:521)
  E/AndroidRuntime(303): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
  E/AndroidRuntime(303): at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:626)
  E/AndroidRuntime(303): at dalvik.system.NativeStart.main(Native Method)

任何建议都将不胜感激，谢谢。

Answer 1

可以试试这个：

final Dialog dialog = new Dialog(YourActivity.this);

Answer 2

Dialog构造函数失败并显示NullPointerException。我能想到的唯一原因是你传入的context参数确实是null。

如何初始化context？