AndroidのUI - GridLayout - liguofeng29’s blog

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- 電卓を配置する -->
<GridLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:columnCount="4"
    android:rowCount="6"
    android:id="@+id/root"
    >
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_columnSpan="4"
        android:textSize="50sp"
        android:layout_marginLeft="2pt"
        android:layout_marginRight="2pt"
        android:padding="3pt"
        android:layout_gravity="right"
        android:background="#84cef1"
        android:textColor="#000000"
        android:text="0"
        />
    <!-- クリアボタン -->
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Clear"
        android:layout_columnSpan="4"
        />

    <!-- 残りボタンはJavaで配置する -->
</GridLayout>

MainActivity.java

package com.example.liguofeng.gridlayout;

import android.graphics.drawable.GradientDrawable;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.widget.Button;
import android.widget.GridLayout;

public class MainActivity extends AppCompatActivity {

    GridLayout gridLayout;

    // 電卓文字
    String[] chars = new String[]{
            "7", "8", "9", "/",
            "6",  "5", "4", "*",
            "3", "2", "1", "-",
            ".", "0", "=", "+",
    };

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

        this.gridLayout = (GridLayout) findViewById(R.id.root);

        for (int i = 0; i < chars.length; i++) {
            Button btn = new Button(this);

            btn.setText(chars[i]);

            // font-size
            btn.setTextSize(40);

            // 余白
            btn.setPadding(5, 35, 5, 35);

            // 配置行と列
            GridLayout.Spec rowSpec = GridLayout.spec(i / 4 + 2);
            GridLayout.Spec columnSpec = GridLayout.spec(i % 4);

            GridLayout.LayoutParams params = new GridLayout.LayoutParams(
                    rowSpec, columnSpec
            );

            // 配置大きさ
            params.setGravity(Gravity.FILL);

            // ボタン追加（配置位置のパラメータつき）
            gridLayout.addView(btn, params);
        }
    }
}