获取WRAP_CONTENT的高度 [英] Get what the WRAP_CONTENT height would be

问题描述

我的目的是让一个不可见的LinearLayout在单击特定按钮时以动画形式显示。为此，我已将默认高度设置为WRAP_CONTENT，在应用启动时获取高度，将高度设置为0，然后在我单击按钮时启动动画。这是代码：

My purpose is to have an invisible LinearLayout that appear whit an animation when click on a specific button. To do this i have set the default height to WRAP_CONTENT, get the height when the app start, set the height to 0 and start the animation when i click on the button. Here is the code:

linearLayout.post(new Runnable() {
    @Override
    public void run(){
        height = linearLayout.getMeasuredHeight();
        linearLayout.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, 0));
    }
});


findViewById(R.id.btnOperator).setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        Animation ani = new ShowAnim(linearLayout, height/* target layout height */);
        ani.setDuration(1000/* animation time */);
        linearLayout.startAnimation(ani);

    }
});

这项工作相当不错，但是我想做些不同的事情。我希望默认高度为0，然后计算WRAP_CONTENT的高度，然后将其传递给：

This work pretty good, but i want to do different. I want that the default height is 0, and then calculate what the WRAP_CONTENT height would be, and pass it to:

Animation ani = new ShowAnim(linearLayout, height/* target layout height */);

我该怎么做？我搜索了但是发现了什么。

How could i do this? I searched but found anything.

推荐答案

尝试以下代码：

linearLayout.measure(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
height = linearLayout.getMeasuredHeight();

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