java - 程序化 View 错误，不确定我做错了什么。必须调用removeView() 子级已经有父级

Question

我在尝试以编程方式创建充满按钮的模块化 ScrollView 时遇到此问题。我的 fragment 接受行、列和每个按钮的名称。我想知道为什么使用以下代码会出现此运行时错误。

错误

The specified child already has a parent. You must call removeView() on the child's parent first.

代码

@Override
public void onViewCreated(View view, Bundle savedInstanceState){
    super.onViewCreated(view, savedInstanceState);

    //linearLayout from scrollView
    LinearLayout linearVertical = 
    getActivity().findViewById(R.id.linear_layout_vertical);

    //LinearLayouts which will each contain buttons
    LinearLayout[] linearLayouts = new LinearLayout[mRows];

    //
    for(int i = 0; i < mRows; i++){
        linearLayouts[i] = new LinearLayout(getContext());
        linearLayouts[i].setLayoutParams(new 
        LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, 
        ViewGroup.LayoutParams.WRAP_CONTENT));
        linearLayouts[i].setOrientation(LinearLayout.HORIZONTAL);
    }

    Button[] buttons = new Button[mRows * mColumns];

    //creating buttons / adding button style
    for(int i = 0; i < mRows * mColumns; i++){
        buttons[i] = new Button(getActivity(), null,R.style.buttonTheme);

        if(i < mNames.length){
            buttons[i].setText(mNames[i]);
        }else{
            buttons[i].setText("NULL");
        }

        buttons[i].setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                buttonPress(v);
            }
        });
    }

    for(int i = 0; i < mRows; i++){
        for(int j = 0; j < mColumns; j++){
            linearLayouts[i].addView(buttons[(i * j) + j]);
        }
        linearVertical.addView(linearLayouts[i]);
    }
}

Answer 1

如下更改最后一个循环，看看它是否有效:

for(int i = 0; i < mRows; i++){
      linearVertical.addView(linearLayouts[i]);
        for(int j = 0; j < mColumns; j++){
            linearLayouts[i].addView(buttons[(i * j) + j]);
        }        
    }