用GridLayout实现计算器的布局

MainActivity.java

package com.kale.gridlayout;

import android.app.Activity;
import android.os.Bundle;
import android.support.v7.widget.GridLayout;
import android.view.Gravity;
import android.widget.Button;

public class MainActivity extends Activity {
	String [] chars = new String[]{
		"7","8","9","÷",
		"4","5","6","x",
		"1","2","3","-",
		".","0","=","+"
	};
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		GridLayout gLayout = (GridLayout)findViewById(R.id.root_gridLayout_id);
		for (int i = 0; i < chars.length; i++) {
			Button bt = new Button(this);
			bt.setText(chars[i]);
			bt.setTextSize(40);
			
			//指定该组件所占的行
			GridLayout.Spec rowSpec = GridLayout.spec(i/4 + 2);
			//指定该组件所占的列
			GridLayout.Spec columnSpec = GridLayout.spec(i % 4); 
			//按照设置好的行和列来建立对象
			GridLayout.LayoutParams params = new GridLayout.LayoutParams(rowSpec,columnSpec);
			//指定该组件占满父控件
			params.setGravity(Gravity.FILL);
			gLayout.addView(bt,params);
		}
		
	}
}

xml