android - 显示自定义对话框android时出现WindowManager BadTokenException

Question

当我运行我的代码时，我得到这个错误:

  : E/InputEventReceiver(1363): Exception dispatching input event.

  : E/MessageQueue-JNI(1363): Exception in MessageQueue callback: handleReceiveCallback

  : D/dalvikvm(1363): GC_CONCURRENT freed 1898K, 30% free 4921K/6992K, paused 78ms+107ms, total 413ms

  : E/MessageQueue-JNI(1363):  android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for  an application

  : E/MessageQueue-JNI(1363):at  com.example.ikmantest2.MainActivity$6.onItemClick(MainActivity.java:269)

这是我收到错误的代码:

gallery.setOnItemClickListener(new OnItemClickListener(){

        @Override
        public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
                long arg3) {
            final Dialog dialog = new Dialog(getBaseContext());
            dialog.setContentView(R.layout.image_dialog_layout);


            // set the custom dialog components - text, image and button
            imageView=(ImageView)dialog.findViewById(R.id.bigger_image);
            imageView.setImageBitmap(exListAdapter.getImageByPosition(lastClickedGroup, arg2));
            pre=(ImageButton)dialog.findViewById(R.id.btn_pre);
            back=(ImageButton)dialog.findViewById(R.id.btn_back);
            next=(ImageButton)dialog.findViewById(R.id.btn_next); 

            // if button is clicked, close the custom dialog
            pre.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    dialog.dismiss();
                }
            });
            back.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    dialog.dismiss();
                }
            });
            next.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    dialog.dismiss();
                }
            });

            /*this is line number 269 as in error code*/  dialog.show();
        }

    }); 

那么我该如何解决这个错误呢？

Answer 1

这样做

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