如何准备一个类似表盘的GridLayout?

How to prepare a dial-like GridLayout?

背景

我正在尝试创建类似表盘的 GridLayout,类似于此草图:

问题

我未能正确创建它。

我的想法是所有单元格都采用相同的 space,均匀分布大小,除了右侧的后退 space 按钮会跨越 3 行。

我试过的

我目前拥有的是:

private TextView generateGridTextButton(final CharSequence textToShowAndAddUponClick) {
    TextView tv = (TextView) LayoutInflater.from(this).inflate(R.layout.grid_text_button, mButtonsGrid, false);
    tv.setText(textToShowAndAddUponClick);
    tv.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(final View view) {
            //...
        }
    });
    return tv;
}

private void initButtonsGrid() {
    for (int i = 1; i <= 3; ++i)
        mButtonsGrid.addView(generateGridTextButton(Integer.toString(i)));
    final ImageView backspaceButton = new ImageView(this);
    backspaceButton.setImageResource(android.R.drawable.sym_def_app_icon);
    final LayoutParams backspaceButtonLayoutParams = new LayoutParams(GridLayout.spec(GridLayout.UNDEFINED, 3, 3), GridLayout.spec(GridLayout.UNDEFINED, 1, 1));
    backspaceButtonLayoutParams.setGravity(Gravity.TOP | Gravity.CENTER_HORIZONTAL);
    backspaceButtonLayoutParams.height = backspaceButtonLayoutParams.width = LayoutParams.WRAP_CONTENT;
    backspaceButton.setLayoutParams(backspaceButtonLayoutParams);
    backspaceButton.setBackground(...));
    mButtonsGrid.addView(backspaceButton);
    for (int i = 4; i <= 9; ++i)
        mButtonsGrid.addView(generateGridTextButton(Integer.toString(i)));
    backspaceButton.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(final View view) {
            //...
        }
    });
    mButtonsGrid.addView(generateGridTextButton("*"));
    mButtonsGrid.addView(generateGridTextButton("0"));
    mButtonsGrid.addView(generateGridTextButton("+"));

    final ImageView actionButton = new ImageView(this);
    actionButton.setImageResource(android.R.drawable.sym_def_app_icon);
    final LayoutParams actionButtonLayoutParams = new LayoutParams(GridLayout.spec(GridLayout.UNDEFINED, 1, 1), GridLayout.spec(GridLayout.UNDEFINED, 1, 1));
    actionButtonLayoutParams.setGravity(Gravity.CENTER);
    actionButtonLayoutParams.height = actionButtonLayoutParams.width = LayoutParams.WRAP_CONTENT;
    actionButton.setLayoutParams(actionButtonLayoutParams);
    actionButton.setBackground(...);
    actionButton.setClickable(true);
    mButtonsGrid.addView(actionButton);
}

res/layout/grid_text_button.xml

<TextView
    xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="wrap_content"
    android:layout_height="wrap_content" android:layout_rowWeight="1"
    android:background="@drawable/..." android:clickable="true" android:fontFamily="..."
    android:gravity="center" android:textColor="#2a373e" android:textSize="36sp" app:layout_columnWeight="1"
    app:layout_gravity="fill" tools:text="1"/>

布局文件是这样的:

    <android.support.v7.widget.GridLayout android:id="@+id/gridLayout"
        ...  app:columnCount="4"
        app:orientation="horizontal" app:rowCount="4">

这几乎可以工作,但由于某些原因,顶部 2 行按钮的高度小于底部 2 行按钮的高度:

我尝试使用重力、重量、跨度的值...但我尝试的任何方法都无济于事(甚至变得更糟)。

问题

这里有什么问题?为什么行的高度不同?

我该如何解决这个问题?

原因是我使用 android:layout_rowWeight 而不是 app:layout_rowWeight ,所以它在旧的 Android 版本上效果不佳。

现在可以正常工作了: