使用PopupWindow彈出menu菜單，解決寬度自適應的問題

 

如圖所示，要實現，PopupWindow彈出的菜單隨內容的寬度決定，目前找到自認爲比較好的辦法是，重寫ListView的onMeasure()方法。而後就能夠實現了，在此mark一下。代碼以下：

@Override
	protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
	    int maxWidth = meathureWidthByChilds() + getPaddingLeft() + getPaddingRight();
	    super.onMeasure(MeasureSpec.makeMeasureSpec(maxWidth, MeasureSpec.EXACTLY), heightMeasureSpec);     
	}

	public int meathureWidthByChilds() {
	    int maxWidth = 0;
	    View view = null;
	    for (int i = 0; i < getAdapter().getCount(); i++) {
	        view = getAdapter().getView(i, view, this);
	        view.measure(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED);
	        if (view.getMeasuredWidth() > maxWidth){
	            maxWidth = view.getMeasuredWidth();
	        }
	    }
	    return maxWidth;
	}