AndroidUi--用GridLayout实现计算器界面

package com.example.luoge.uisample3;
/*实现计算器界面*/

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

public class MainActivity extends AppCompatActivity {

GridLayout gridLayout;
String [] ops =  new String[]{
"1" ,"2","3","/",
"4","5","6","*",
"7","8","9","-",
".","0","=","+",
};

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
gridLayout = (GridLayout)findViewById(R.id.root);
for(int i=0;i<ops.length;i++)
{
Button bn = new Button(this);
//设置按钮内容
bn.setText(ops[i]);
//设置文字大小
bn.setTextSize(40);
bn.setBackgroundColor(0xffffbb33);
bn.setPadding(10,10<
4000
/span>,10,10);

GridLayout.Spec rowSpec = GridLayout.spec(i/4+2);
GridLayout.Spec columnSpec = GridLayout.spec(i%4);
GridLayout.LayoutParams  params = new GridLayout.LayoutParams(rowSpec,columnSpec);
params.setGravity(Gravity.FILL);
gridLayout.addView(bn,params);

}

}

}

<?xml version="1.0" encoding="utf-8"?>
<GridLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:rowCount="6"
android:columnCount="4"
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="4px"
android:layout_marginRight="4px"
android:padding="5px"
android:layout_gravity="right"
android:background="#eee"
android:textColor="#000"
android:text="0"
/>

<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_columnSpan="4"
android:backgroundTint="@android:color/holo_orange_light"
android:text="清除" />

</GridLayout>