如何使用 Java 设置 columnWeight

Question

The title explains what I need. I want to set columnWeight of Button (Because is inside GridLayout) but from code.

Something like that with code:

<Button android:layout_column="0"
    android:layout_row="0"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_rowWeight="1"
    android:layout_columnWeight="1" />

Answer 1

You need to use LinearLayout subviews. Like the user Price says:

There are limitations when using the GridLayout, the following quote is taken from the documentation .

"GridLayout does not provide support for the principle of weight, as defined in weight. In general, it is not therefore possible to configure a GridLayout to distribute excess space in non-trivial proportions between multiple rows or columns ... For complete control over excess space distribution in a row or column; use a LinearLayout subview to hold the components in the associated cell group."

Here is a small example that uses LinearLayout subviews. (I used Space Views that takes up unused area and pushes the buttons into desired position.)

<GridLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:columnCount="1"
    >
        <TextView
            android:text="2x2 button grid"
            android:textSize="32dip"
            android:layout_gravity="center_horizontal" />

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal">
            <Space
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:layout_weight="1" />
            <Button
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Button 1" />
            <Space
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:layout_weight="1" />
            <Button
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="start"
                android:text="Button 2" />
            <Space
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:layout_weight="1" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
        >
            <Space
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:layout_weight="1" />
            <Button
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Button 3" />
            <Space
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:layout_weight="1" />
            <Button
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="start"
                android:text="Button 4" />
            <Space
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:layout_weight="1" />
        </LinearLayout>
    </GridLayout>

Check Price's response for more information.

Answer 2

试试看： ((GridLayout.LayoutParams) button.getLayoutParams()).columnSpec = GridLayout.spec(GridLayout.UNDEFINED, 1f) ;

Answer 3

You can use spec() method to define the columnWeight from java code.

GridLayout.LayoutParams param = new LayoutParams(GridLayout.spec(GridLayout.UNDEFINED, 1f),  GridLayout.spec(GridLayout.UNDEFINED, 1f));

button.setLayoutParams(param);