How to make a GridLayout fit screen size in Android?

This example demonstrates how How to make a GridLayout fit screen size in Android.

Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.

Step 2 − Add the following code to res/layout/activity_main.xml.

<?xml version="1.0" encoding="utf-8"?>
<GridLayout xmlns:android="https://schemas.android.com/apk/res/android"
   xmlns:app="https://schemas.android.com/apk/res-auto"
   xmlns:tools="https://schemas.android.com/tools"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:id="@+id/tableGrid"
   android:layout_gravity="center"
   android:columnCount="4"
   android:orientation="horizontal"
   tools:context=".MainActivity">
   <Button android:text="1" />
   <Button android:text="2" />
   <Button android:text="3" />
   <Button android:text="4" />
   <Button android:text="5" />
   <Button android:text="6" />
   <Button android:text="7" />
   <Button android:text="8" />
   <Button android:text="9" />
   <Button android:text="10" />
   <Button android:text="11" />
   <Button android:text="12" />
   <Button android:text="13" />
   <Button android:text="14" />
   <Button android:text="15" />
   <Button android:text="16" />
</GridLayout>

Step 3 − Add the following code to src/MainActivity.java

package com.app.sample;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.widget.GridLayout;
import android.widget.ImageView;
import android.widget.TableLayout;
public class MainActivity extends AppCompatActivity {
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      GridLayout gridLayout = (GridLayout)findViewById(R.id.tableGrid);
      gridLayout.removeAllViews();
      int total = 12;
      int column = 5;
      int row = total / column;
      gridLayout.setColumnCount(column);
      gridLayout.setRowCount(row + 1);
      for(int i =0, c = 0, r = 0; i < total; i++, c++){
         if(c == column){
            c = 0;
            r++;
         }
         ImageView oImageView = new ImageView(this);
         oImageView.setImageResource(R.drawable.ic_launcher_background);
         GridLayout.LayoutParams param =new GridLayout.LayoutParams();
         param.height = TableLayout.LayoutParams.WRAP_CONTENT;
         param.width = TableLayout.LayoutParams.WRAP_CONTENT;
         param.rightMargin = 5;
         param.topMargin = 5;
         param.setGravity(Gravity.CENTER);
         param.columnSpec = GridLayout.spec(c);
         param.rowSpec = GridLayout.spec(r);
         oImageView.setLayoutParams (param);
         gridLayout.addView(oImageView);
      }
   }
}

Step 4 − Add the following code to Manifests/AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="https://schemas.android.com/apk/res/android"
   package="com.app.sample">
   <application
      android:allowBackup="true"
      android:icon="@mipmap/ic_launcher"
      android:label="@string/app_name"
      android:roundIcon="@mipmap/ic_launcher_round"
      android:supportsRtl="true"
      android:theme="@style/AppTheme">
         <activity android:name=".MainActivity">
            <intent-filter>
               <action android:name="android.intent.action.MAIN" />
               <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
         </activity>
   </application>
</manifest>

Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from the android studio, open one of your project's activity files and click Run icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen −