bug -- android 7.0 popwindow显示位置异常情况解决

import android.content.Context;
import android.os.Build;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.View;
import android.widget.PopupWindow;

/**
 * 解决7.0 popwindow显示位置的问题
 * Created by soyoungboy on 2017/3/16.
 */

public class FixPopWindow extends PopupWindow {
    public FixPopWindow() {
    }


    public FixPopWindow(View contentView) {
        super(contentView);
    }


    public FixPopWindow(View contentView, int width, int height) {
        super(contentView, width, height);
    }


    public FixPopWindow(View contentView, int width, int height, boolean focusable) {
        super(contentView, width, height, focusable);
    }


    public FixPopWindow(Context context) {
        super(context);
    }


    public FixPopWindow(Context context, AttributeSet attrs) {
        super(context, attrs);
    }


    public FixPopWindow(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }


    public FixPopWindow(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
    }


    public FixPopWindow(int width, int height) {
        super(width, height);
    }


    @Override public void showAsDropDown(View anchorView) {
        super.showAsDropDown(anchorView);
        if (Build.VERSION.SDK_INT == 24) {
            int[] a = new int[2];
            anchorView.getLocationInWindow(a);
            showAtLocation(anchorView, Gravity.NO_GRAVITY, 0, a[1] + anchorView.getHeight() + 0);
        } else {
            super.showAsDropDown(anchorView);
        }
    }


    @Override
    public void showAsDropDown(View anchorView, int xoff, int yoff) {
        if (Build.VERSION.SDK_INT == 24) {
            int[] a = new int[2];
            anchorView.getLocationInWindow(a);
            showAtLocation(anchorView, Gravity.NO_GRAVITY, xoff,
                a[1] + anchorView.getHeight() + yoff);
        } else {
            super.showAsDropDown(anchorView, xoff, yoff);
        }
    }
}