java-是否可以将按钮添加到以编程方式设置的框架布局中？

这有点难以描述,但我会尽力而为：

我正在开发一个使用自定义摄像头活动的android应用.在此摄影机活动中,我使用编程方式创建一个表面视图,并将其设置为xml布局文件中定义的框架布局(全屏显示).

我现在的问题是,如何在框架布局中添加其他元素？仅以编程方式？我问是因为到目前为止,我只能以编程方式添加其他元素.我在xml布局中添加的元素没有出现在屏幕上.
它们是否可能位于我添加到框架布局的表面视图的后面？如果是这样,是否有可能将它们带到最前面？

感谢大伙们！

解决方法:

当然,您可以在FrameLayout中添加尽可能多的按钮和其他小部件.由于FrameLayout允许堆叠视图,因此您在xml文件中添加的组件现在位于以编程方式添加的视图的后面.以下是如何动态创建和添加小部件的方法：

// find your framelayout
frameLayout = (FrameLayout) findViewById(....);

// add these after setting up the camera view        

// create a new Button
Button button1 = new Button(this);

// set button text
button1.setText("....");

// set gravity for text within button
button1.setGravity(Gravity.....);

// set button background
button1.setBackground(getResources().getDrawable(R.drawable.....));

// set an OnClickListener for the button
button1.setOnClickListener(new OnClickListener() {....})

// declare and initialize LayoutParams for the framelayout
FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(
            FrameLayout.LayoutParams.WRAP_CONTENT,
            FrameLayout.LayoutParams.WRAP_CONTENT);

// decide upon the positioning of the button //
// you will likely need to use the screen size to position the
// button anywhere other than the four corners
params.setMargins(.., .., .., ..);

// use static constants from the Gravity class
params.gravity = Gravity.CENTER_HORIZONTAL;

// add the view
fl1.addView(button2, params);

// create and add more widgets

....
....

编辑1：

您可以在此处使用一个技巧：

// Let's say you define an imageview in your layout xml file. Find it in code:
imageView1 = (ImageView) findViewById(....);

// Now you add your camera view.
.........

// Once you add your camera view to the framelayout, the imageview will be 
// behind the frame. Do the following:
framelayout.removeView(imageView1);
framelayout.addView(imageView1);

// That's it. imageView1 will be on top of the camera view, positioned the way
// you defined in xml file

发生这种情况是因为：

Child views are drawn in a stack, with the most recently added child on top (from android resource page on FrameLayout)

标签：android-framelayout,android,java,android-linearlayout
来源： https://codeday.me/bug/20191012/1899618.html