Android遏止AlertDialog关闭

 1 AlertDialog.Builder builder = new AlertDialog.Builder(getActivity()); 2 builder.setTitle("测试"); 3  4 LayoutInflater inflater = getActivity().getLayoutInflater(); 5 View view = inflater.inflate(R.layout.dialogfragment_num_input, null); 6 builder.setView(view); 7  8 builder.setPositiveButton("确定", 9         new DialogInterface.OnClickListener() {10             @Override11             public void onClick(DialogInterface dialog, int id) {12 13                 Field field = null;14 15                 try {16                     //通过反射获取dialog中的私有属性mShowing17                     field = dialog.getClass().getSuperclass().getDeclaredField("mShowing");18                     field.setAccessible(true);//设置该属性可以访问19                 } catch (Exception ex) {20 21                 }22 23                 String inputValue = String.valueOf(mEdit.getText());24                 if (inputValue == null || "".equals(inputValue)) {25                     try {26                         //设置dialog不可关闭27                         field.set(dialog, false);28                         dialog.dismiss();29                     } catch (Exception ex) {30                     }31                 } else {32 33                    //34                    //做自己的事35                    //36                     try {37                         //关闭38                         field.set(dialog, true);39                         dialog.dismiss();40                     } catch (Exception ex) {41                     }42                 }43             }44         });45 builder.setNegativeButton("取消",46         new DialogInterface.OnClickListener() {47             @Override48             public void onClick(DialogInterface dialog, int id) {49 50                 Field field = null;51 52                 try {53                     //通过反射获取dialog中的私有属性mShowing54                     field = dialog.getClass().getSuperclass().getDeclaredField("mShowing");55                     field.setAccessible(true);//设置该属性可以访问56                 } catch (Exception ex) {57                 }58 59                 try {60                     field.set(dialog, true);61                     dialog.dismiss();62                 } catch (Exception ex) {63                 }64 65             }66         });67 68 69 builder.create();