单击后退关闭对话框并关闭活动

设置mDialog.setOnCancelListener(listener)并关闭该Activity侦听器.

@Override
mDialog.setOnCancelListener(new OnCancelListener() {

    public void onCancel(DialogInterface interface) {
        this.finish();            
    }
});

或者你可以用OnKeyListener你的Dialog.

mDialog.setOnKeyListener(new Dialog.OnKeyListener() {

        @Override
        public boolean onKey(DialogInterface interface, int keyCode,
                KeyEvent event) {
            if (keyCode == KeyEvent.KEYCODE_BACK) {
                this.finish();
            }
            return true;
        }
    });