(1)EditText中保留小数点后两位；

解决方法: https://blog.csdn.net/yinzhijiezhan/article/details/46819261
/**
* 第一种方法
*/

    num_et.addTextChangedListener(new TextWatcher() {    
        @Override
        public void onTextChanged(CharSequence s, int start, int before,
                int count) {
            if (s.toString().contains(".")) {
                if (s.length() - 1 - s.toString().indexOf(".") > 2) {
                    s = s.toString().subSequence(0,
                            s.toString().indexOf(".") + 3);
                    num_et.setText(s);
                    num_et.setSelection(s.length());
                }
            }
            if (s.toString().trim().substring(0).equals(".")) {
                s = "0" + s;
                num_et.setText(s);
                num_et.setSelection(2);
            }
            if (s.toString().startsWith("0")
                    && s.toString().trim().length() > 1) {
                if (!s.toString().substring(1, 2).equals(".")) {
                    num_et.setText(s.subSequence(0, 1));
                    num_et.setSelection(1);
                    return;
                }
            }
        }
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count,
                int after) {
        }
        @Override
        public void afterTextChanged(Editable s) {
            // TODO Auto-generated method stub
        }
    });
    /**
     * 第二种方法
     */
    num_et2.addTextChangedListener(new TextWatcher() 
      {
          public void afterTextChanged(Editable edt) 
          {
              String temp = edt.toString();
              int posDot = temp.indexOf(".");
              if (posDot <= 0) return;
              if (temp.length() - posDot - 1 > 2)
              {
                  edt.delete(posDot + 3, posDot + 4);
              }
          }
          public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {}
          public void onTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {}
      });
}

(2) This Gradle plugin requires a newer IDE able to request IDE model level 3

解决方法：https://blog.csdn.net/qiutiandepaomo/article/details/78919069

(3) “买卖旺”app项目用小米MIX 2调试闪退

解决方法:换vivo x6d手机调式正常

(4)applicationId不同导致微信分享失败，以及applicationId和packageName的区别？

解决方法: https://www.baidu.com/s?ie=utf-8&f=8&rsv_bp=1&rsv_idx=1&tn=monline_3_dg&wd=package%E5%92%8CapplicationId%E7%9A%84%E5%8C%BA%E5%88%AB&oq=package%25E5%2592%258Capp&rsv_pq=acef5ba20000eb08&rsv_t=efeevkM88ojJh8q6lcOFQ4xafRl4uzgiXNMlANStLp6ph5HvM37J%2F5IG6GIMG53q%2FQxf&rqlang=cn&rsv_enter=0&inputT=29768&rsv_sug3=79&rsv_sug1=57&rsv_sug7=100&rsv_n=2&rsv_sug2=0&rsv_sug4=48852

(5)process exit non-zero -1;

解决办法:删除build文件，重新编译运行即可;

(6)大图片手机卡住的问题

解答:上传的时候，对图片进行压缩处理;加载的时候，不使用开线程网络请求加载图片，而是使用volly网络框架加载图片;

(7) device supports but apk only supports

解答:
https://www.baidu.com/s?ie=utf-8&f=8&rsv_bp=1&tn=monline_4_dg&wd=device%20supports%20but%20apk%20only%20supports&oq=%25E6%259E%2581%25E5%2585%2589%25E6%258E%25A8%25E9%2580%2581&rsv_pq=c36d6dc7000024e8&rsv_t=4721VmP6nf1ySuIKJNMDsD9ceMMP5KZflX9wiv8N4QMn0ccAN1oqihF7rLb0M%2FLOZc1%2F&rqlang=cn&rsv_enter=1&rsv_sug3=13&rsv_sug1=10&rsv_sug7=101&bs=%E6%9E%81%E5%85%89%E6%8E%A8%E9%80%81

https://blog.csdn.net/qq_32452623/article/details/71076023

(8) 在用vivo x9手机运行程序时，出现“解析软件包时出现问题”的问题

解决:https://blog.csdn.net/wl521124/article/details/80558155

(9)编译、运行安装正常,打包出现（删除build文件夹，重新构建，编译）

Error:Execution failed for task ':app:mergeReleaseResources'.

java.lang.RuntimeException: com.google.gson.stream.MalformedJsonException: Use JsonReader.setLenient(true) to accept malformed JSON at line 1 column 1

命令行:gradlew :app:mergeReleaseResources –i

(10)editext软键盘问题

https://www.cnblogs.com/xuanwei-qingfeng/p/7445002.html
https://blog.csdn.net/u012523122/article/details/52101303