Question

android怎么在popupwindow中实现接口回调

怎么在popupwindow中实现接口回调啊，我实例化接口时总是不对。
public class A extends Activity implements C{

@Override
public void in(int a) {
// TODO Auto-generated method stub
System.out.println(a);
}
}

public class B extends PopupWindow{
C c;
public B() {
// TODO Auto-generated constructor stub
//怎么实例化C啊
//c=new ??
c.in(100);
}
public interface C{
public void in(int a);
}
}

Answer 1

你在B中实现c的get和set方法。在A中调用setC(this),就可以了
public class A extends Activity implements C{

@Override
public void in(int a) {
// TODO Auto-generated method stub
System.out.println(a);
}
PopupWindow p = new PopupWindow();
p.setC(this);
}

public class B extends PopupWindow{
C c;
public B() {
// TODO Auto-generated constructor stub
//怎么实例化C啊
//c=new ??
c.in(100);
}
public void setC(C c){
this.c = c;
}
public interface C{
public void in(int a);
}
}

Answer 2

Android中正确的PopouWindow写法

PopupWindow popupWindow = new PopupWindow(contentView,LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, false);//实例化
popupWindow.setBackgroundDrawable(new BitmapDrawable());
popupWindow.setOutsideTouchable(true);//设置点击窗外隐藏
//隐藏监听
popupWindow.setOnDismissListener(new OnDismissListener()
{
    public void onDismiss()
    {
        //接口方法实现
    }
});

//显示
popupWindow.showAsDropDown(findViewById(R.id.menu));
//隐藏
popupWindow.dismiss();

Answer 3

public B() {
// TODO Auto-generated constructor stub
//怎么实例化C啊
//c=new ??
c.in(100);
}

答案就是改一下
public B(C imp) {
c = imp;
}

然后A里面初始化弹窗的时候把自己传进去。
new B(this);

Answer 4

这个不用你实例化，你在构造参数中传进来即可