Android 设置公用变量方法

1、声明公用类继承自application；

package bize;

import android.app.Application;

public class PublicMethod extends Application {

private String username;

public String getUsername() {
return username;
}

public void setUsername(String username) {
this.username = username;
}

}

2、AndroidManifest.xml添加： android:name="bize.PublicMethod" ；

3、赋值：
PublicMethod app = (PublicMethod)getApplicationContext();//用户名设为公用变量
app.setUsername(user);

4、调用：
PublicMethod app = (PublicMethod)context.getApplicationContext();

        String emp = app.getUsername();