每日总结2023-04-27——关于全局变量的基础使用
今天完成了对全局变量的使用
package com.example.math; /* * 全局变量 * */ import android.app.Application; public class CustomApplication extends Application { private static final String VALUE = "111"; private String value; @Override public void onCreate() { super.onCreate(); setValue(VALUE); // 初始化全局变量 } public void setValue(String value) { this.value = value; } public String getValue() { return value; } }
在声明中加上
android:name=".CustomApplication"
使用：
user_name = findViewById(R.id.userName); user_password = findViewById(R.id.userPassword); String userName = user_name.getText().toString(); CustomApplication app = (CustomApplication) getApplication(); app.setValue(userName);//setValue调用设置变量
TextView tv_name = findViewById(R.id.mel_tv_2); CustomApplication app = (CustomApplication) getApplication(); String name = app.getValue(); tv_name.setText(name); //getVlue获取变量