Android 点击屏幕或者返回键dialog不消失

1.在dialog.show();之前加dialog.setCanceledOnTouchOutside(false);//点击屏幕dialog不消失

                       dialog.setCancelable(false);//点击返回dialog不消失  

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2.屏蔽返回键,按返回键时不销毁当前activity

       重写onKeyDown方法

@Override
   public boolean onKeyDown(int keyCode, KeyEvent event) {
       if (keyCode == KeyEvent.KEYCODE_BACK) {
           return false;
       }
       return super.onKeyDown(keyCode, event);
   }