Java – how to programmatically add the layout of GridLayout children_ columnWeight？

I want to use GridLayout (not GridView) as a board for games such as chess or chess Since I was a little reluctant to use XML files with 64 subviews, I tried to add them programmatically

For simplicity, I started using textviews as a child view of GridLayout

My problem is that the views are not evenly distributed. I don't know how to get uniform distribution in my java code Set layout_ Columnweight and layout_ Rowweight has no method like "setweight()"

At present, this is my activity_ dynamic_ grid_ layout. xml：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
            android:layout_width="match_parent"
            android:layout_height="match_parent">

<ImageView
    android:layout_width="match_parent"
    android:layout_height="80dp"
    android:id="@+id/ivlogo"
    android:background="#ff0000"
    android:layout_alignParentTop="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"/>

<android.support.v7.widget.GridLayout
    android:id="@+id/grid_layout"
    android:background="#004080"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_below="@+id/ivlogo"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:layout_marginTop="36dp">

</android.support.v7.widget.GridLayout>

Here I set the width and height of the GridLayout to match_ Parent, but I use viewtreeobserver at runtime Onpredrawlistener changes them to get a square board In this way, the color background shows the square space

My oncreate()

@Override
protected void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_dynamic_grid_layout);

    GridLayout gl = (GridLayout) findViewById(R.id.grid_layout);
    gl.setColumnCount(8);
    gl.setRowCount(8);

    for(int i=0; i<gl.getRowCount(); i++)
    {
        GridLayout.Spec rowSpec = GridLayout.spec(i,1,GridLayout.FILL);

        for(int j=0;j<gl.getColumnCount();j++)
        {
            GridLayout.Spec colSpec = GridLayout.spec(j,GridLayout.FILL);

            TextView tvChild = new TextView(this);
            tvChild.setText("[ " + i + " | " + j + " ]");
            tvChild.setTextSize(18f);
            tvChild.setTextColor(Color.WHITE);
            tvChild.setGravity(Gravity.CENTER);

            GridLayout.LayoutParams myGLP = new GridLayout.LayoutParams();
            myGLP.rowSpec = rowSpec;
            myGLP.columnSpec = colSpec;

            gl.addView(tvChild,myGLP );
        }
    }

    final View rootView = findViewById(R.id.dynamic_root);

    rootView.getViewTreeObserver().addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener()
    {
        @Override
        public boolean onPreDraw()
        {
            int w = rootView.getMeasuredWidth();
            int h = rootView.getMeasuredHeight();
            int min = Math.min(w,h);

            ViewGroup.LayoutParams lp = gl.getLayoutParams();
            lp.width = min - min % 9;
            lp.height = lp.width;
            gl.setLayoutParams(lp);

            rootView.getViewTreeObserver().removeOnPreDrawListener(this);

            return true;
        }
    });
}

I've tried:

I put a textview subitem in the layout file and tried to get it from its GridLayout Copy layout in layoutparams_ Columnweight and layout_ rowWeight：

<android.support.v7.widget.GridLayout
 ...>   
    <TextView
        android:id="@+id/clone_my_params"
        android:text="[ 0 | 0 ]"
        android:textColor="#ffffff"
        android:textSize="18sp"
        app:layout_column="0"
        app:layout_row="0"
        app:layout_columnWeight="1"
        app:layout_rowWeight="1"
    />
</android.support.v7.widget.GridLayout>

Additional code in oncreate() before double loop:

TextView v = (TextView)gl.findViewById(R.id.clone_my_params);
v.setGravity(Gravity.CENTER);
GridLayout.LayoutParams gridLayoutParamsToCopy = new GridLayout.LayoutParams(v.getLayoutParams());

Inside the loop, I skip (I, J) = (0,0) and change

GridLayout.LayoutParams myGLP = new GridLayout.LayoutParams();

to

GridLayout.LayoutParams myGLP = new GridLayout.LayoutParams(gridLayoutParamsToCopy);

Before the change, all elements are in the upper left corner, and the extra space is given to the last row / column After the change, the first row / column has extra space, and other elements do not change

After double loop, call gl.. Invalidate() and / or GL Requestlayout() is invalid

So I don't seem to have managed to set the required weight by using the copy constructor

Solution

To set weights on children of a GridLayout, use one of the spec() (one) methods that take floating-point values

Another method is to make a custom view (in this case, you need to draw fragments manually) or a custom ViewGroup (in this case, the custom ViewGroup will only deal with fragment positioning, which will be appropriate if you plan to have a more complex view hierarchy than a simple textview