Android 7.0以上(包含8.0), popupWindow彈窗位置異常, 解決方案

通常我們的App中, 在標題的位置, 點擊需要彈出菜單, 效果如下:

 

public void showAsDropDown(View anchor, int xoff, int yoff) {
    showAsDropDown(anchor, xoff, yoff, DEFAULT_ANCHORED_GRAVITY);
}

但是往往並不是我們想的那樣, 至今Android7.0,以上包括(7.1, 8.0) 系統的手機彈窗, 根本不按套路出牌, 以致我們相同的代碼, 卻有不同的效果. 

 

你可能看到這樣的代碼

if (Build.VERSION.SDK_INT >= 24) {
     int[] location = new int[2];
     anchor.getLocationOnScreen(location);
     // 7.1 版本處理
     if (Build.VERSION.SDK_INT == 25) {
         WindowManager windowManager = (WindowManager) pw.getContentView().getContext().getSystemService(Context.WINDOW_SERVICE);
         if (windowManager != null) {
             int screenHeight = windowManager.getDefaultDisplay().getHeight();
             // PopupWindow height for match_parent, will occupy the entire screen, it needs to do special treatment in Android 7.1
             pw.setHeight(screenHeight - location[1] - anchor.getHeight() - yoff);
         }
     }
     pw.showAtLocation(anchor, Gravity.NO_GRAVITY, xoff, location[1] + anchor.getHeight() + yoff);

 } else {
     pw.showAsDropDown(anchor, xoff, yoff);
 }

試試效果, 還真行.

Android8.0系統, 這樣的方式並不能解決,.

終極解決方案(7.0, 7.1, 8.0)

/**
 *
 * @param pw     popupWindow
 * @param anchor v
 * @param xoff   x軸偏移
 * @param yoff   y軸偏移
 */
public static void showAsDropDown(final PopupWindow pw, final View anchor, final int xoff, final int yoff) {
    if (Build.VERSION.SDK_INT >= 24) {
        Rect visibleFrame = new Rect();
        anchor.getGlobalVisibleRect(visibleFrame);
        int height = anchor.getResources().getDisplayMetrics().heightPixels - visibleFrame.bottom;
        pw.setHeight(height);
        pw.showAsDropDown(anchor, xoff, yoff);
    } else {
        pw.showAsDropDown(anchor, xoff, yoff);
    }
}