如何将视图动态添加到已在 xml 布局中声明的 RelativeLayout? [英] How to add views dynamically to a RelativeLayout already declared in the xml layout?

问题描述

我在 xml 布局文件中声明了一个 RelativeLayout.现在我想将 Views 从代码添加到现有布局.我通过代码向这个现有布局动态添加了一个 Button ，如下所示:

I declared a RelativeLayout in a xml layout file. Now I want to add Views from code to the existing Layout. I added a Button dynamically to this existing layout as below through code:

rLayout = (RelativeLayout)findViewById(R.id.rlayout); 
        LayoutParams lprams = new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);
        Button tv1 = new Button(this); 
        tv1.setText("Hello"); 
        tv1.setLayoutParams(lprams); 
        tv1.setId(1); 
        rLayout.addView(tv1); 

现在我需要在已添加的 Button 的右侧添加另一个 Button.我找不到在先前添加的按钮右侧添加新按钮的方法.

Now I need to add another Button to the right of the already added Button. I am not able to find the way in which I can add the new one to the right of the previously added button.

推荐答案

为第二个添加的ButtonLayoutParams添加规则RelativeLayout.RIGHT_OF:

Add the rule RelativeLayout.RIGHT_OF for the second added Button LayoutParams:

    // first Button
    RelativeLayout rLayout = (RelativeLayout) findViewById(R.id.rlayout);
    RelativeLayout.LayoutParams lprams = new RelativeLayout.LayoutParams(
            RelativeLayout.LayoutParams.WRAP_CONTENT,
            RelativeLayout.LayoutParams.WRAP_CONTENT);
    Button tv1 = new Button(this);
    tv1.setText("Hello");
    tv1.setLayoutParams(lprams);
    tv1.setId(1);
    rLayout.addView(tv1);

    // second Button
    RelativeLayout.LayoutParams newParams = new RelativeLayout.LayoutParams(
            RelativeLayout.LayoutParams.WRAP_CONTENT,
            RelativeLayout.LayoutParams.WRAP_CONTENT);
    Button tv2 = new Button(this);
    tv1.setText("Hello2");
    newParams.addRule(RelativeLayout.RIGHT_OF, 1);
    tv2.setLayoutParams(newParams);
    tv2.setId(2);
    rLayout.addView(tv2);

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