计算器界面

 

Demo2\jisuanqi\src\main\res\layout\activity_main.xml

<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="match_parent"
    tools:context=".MainActivity"
    android:id="@+id/root"
    android:rowCount="6"
    android:columnCount="4">
    <!--定义一个横跨4列的文本框-->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_columnSpan="4"
        android:textSize="50sp"
        android:layout_marginLeft="2dp"
        android:layout_marginRight="2dp"
        android:padding="3dp"
        android:layout_gravity="right"
        android:background="#eee"
        android:textColor="#000"
        android:text="0"/>
    <!--定义一个横跨4列的按钮-->
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_columnSpan="4"
        android:text="清除"/>


</GridLayout>

 

Demo2\jisuanqi\src\main\java\com\ly\jisuanqi\MainActivity.java

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

public class MainActivity extends Activity {
    private GridLayout gridLayout;
    //定义16个按钮的文本
    private String[] chars=new String[]{
            "7","8","9","/",
            "4","5","6","*",
            "1","2","3","-",
            ".","0","=","+",
    };
    private Button bn;
    @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 < chars.length; i++) {
            bn =new Button(this);
            bn.setText(chars[i]);
            //设置该按钮的字号大小
            bn.setTextSize(40);
            //设置按钮四周的空白区域
            bn.setPadding(5,35,5,35);
            //指定该组件所在的行
            GridLayout.Spec rowSpec = GridLayout.spec(i/4+2);
            //指定该组件所在的列
            GridLayout.Spec columnSpec=GridLayout.spec(i%4);
            GridLayout.LayoutParams params = new GridLayout.LayoutParams(rowSpec,columnSpec);
            //指定该组件占满父容器
            params.setGravity(Gravity.FILL);
            gridLayout.addView(bn,params);
        }
    }


}