Android studio 在其他类中引用mainactivity的变量和方法

接口interface
方法一:传对象

public class MainActivity extends Activity
{
   ……
   public void anotherClass()
   {
      AnotherClass activity = new AnotherClass(this);
   }
}

public class AnotherClass
{
    private MainActivity activity;
    public AnotherClass(MainActivity activity)
    {
       this.activity = activity;
    }
}

方法二:传接口

public interface IActivity
{
    // 与Activity里同名同参数的方法声明
}

public class MainActivity extends Activity implements IActivity
{
   ……
   public void anotherClass()
   {
      AnotherClass activity = new AnotherClass(this);
   }
}

public class AnotherClass
{
    private IActivity iActivity;
    public AnotherClass(IActivity iActivity)
    {
       this.iActivity = iActivity;
    }
}