How to limit Dialog's max height?

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1. We can make it to play trick in code. 

At Dialog‘s show function, after app has set contentView, we can add a GlobalLayoutListener on decorView‘s ViewTreeObserver. At the listener, we can check the decorView‘s height, if over the max height, just truncate it.

 1 private void resolveAlertDialogHeight() { 2         WindowManager wm = (WindowManager) mContext 3                 .getSystemService(Context.WINDOW_SERVICE); 4         Display display = wm.getDefaultDisplay(); 5  6         Point size = new Point(); 7         display.getSize(size); 8         int height = size.y; 9 10         final int maxHeight = (int) (height * 0.68);11 12         final View decorView = mWindow.getDecorView();13         decorView.getViewTreeObserver().addOnGlobalLayoutListener(14                 new OnGlobalLayoutListener() {15                     @Override16                     public void onGlobalLayout() {17                         int actualHeight = decorView.getMeasuredHeight();18 19                         WindowManager.LayoutParams l = mWindow.getAttributes();20                         if (actualHeight > maxHeight) {21                             l.height = maxHeight;22 23                             mWindow.setAttributes(l);24                         }25 26                         decorView.getViewTreeObserver()27                                 .removeOnGlobalLayoutListener(this);28                     }29                 });30     }

 

2. Modify windowBackground reference png.

The dot9 png referenced by android:windowBackground attr is the Dialog‘s background. We can modify this dot9 png, adding extra padding on top and bottom to limit the margin of Alert.