Android set與get/全域性變數
阿新 • • 發佈:2020-09-20
1建立一個包,命名Bean
2.宣告兩個物件,然後將游標放置我們所要生成get,set方法的物件處,然後右擊,選擇Genera 選擇“Getter and Setter ”,然後“OK”即可這就生成get set 方法了
Code—>Genera —> Getter and Setter
package com.example.demo.Bean; public class Data extends { private String ed_dbuser; private String ed_dbpassword; public String getEd_dbuser() {return ed_dbuser; } public void setEd_dbuser(String ed_dbuser) { this.ed_dbuser = ed_dbuser; } public String getEd_dbpassword() { return ed_dbpassword; } public void setEd_dbpassword(String ed_dbpassword) { this.ed_dbpassword = ed_dbpassword; } }
注意 在一個activity裡 new 的例項方法 只能在當前這個activity裡呼叫
Data data =new Data();
data.setEd_dbname();
data.getEd_dbname()
參考:https://blog.csdn.net/qq_38041708/article/details/80544881
如果其他activity 需要公用這物件需要設定全句變數
Application的定義繼承關係如下:
Object <- Context <- ContextWrapper <- Application <- BaseApplication
package com.example.demo.Bean; import android.app.Application; public class Data extends Application { private String ed_dbuser; private String ed_dbpassword; public String getEd_dbuser() { return ed_dbuser; } public void setEd_dbuser(String ed_dbuser) { this.ed_dbuser = ed_dbuser; } public String getEd_dbpassword() { return ed_dbpassword; } public void setEd_dbpassword(String ed_dbpassword) { this.ed_dbpassword = ed_dbpassword; } }
繼承Application 後所有的activity 都可以訪問 Data裡的物件
Data data=(data) getApplication();
在清單檔案還要配置
android:name="com.example.demo.Bean.Data">