计算器界面

Demo2jisuanqisrcmain eslayoutactivity_main.xml

 1 <GridLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     tools:context=".MainActivity"
 6     android:id="@+id/root"
 7     android:rowCount="6"
 8     android:columnCount="4">
 9     <!--定义一个横跨4列的文本框-->
10     <TextView
11         android:layout_width="match_parent"
12         android:layout_height="wrap_content"
13         android:layout_columnSpan="4"
14         android:textSize="50sp"
15         android:layout_marginLeft="2dp"
16         android:layout_marginRight="2dp"
17         android:padding="3dp"
18         android:layout_gravity="right"
19         android:background="#eee"
20         android:textColor="#000"
21         android:text="0"/>
22     <!--定义一个横跨4列的按钮-->
23     <Button
24         android:layout_width="match_parent"
25         android:layout_height="wrap_content"
26         android:layout_columnSpan="4"
27         android:text="清除"/>
28 
29 
30 </GridLayout>

Demo2jisuanqisrcmainjavacomlyjisuanqiMainActivity.java

 1 import android.app.Activity;
 2 import android.os.Bundle;
 3 import android.view.Gravity;
 4 import android.widget.Button;
 5 import android.widget.GridLayout;
 6 
 7 public class MainActivity extends Activity {
 8     private GridLayout gridLayout;
 9     //定义16个按钮的文本
10     private String[] chars=new String[]{
11             "7","8","9","/",
12             "4","5","6","*",
13             "1","2","3","-",
14             ".","0","=","+",
15     };
16     private Button bn;
17     @Override
18     protected void onCreate(Bundle savedInstanceState) {
19         super.onCreate(savedInstanceState);
20         setContentView(R.layout.activity_main);
21         gridLayout = (GridLayout) findViewById(R.id.root);
22         for (int i = 0; i < chars.length; i++) {
23             bn =new Button(this);
24             bn.setText(chars[i]);
25             //设置该按钮的字号大小
26             bn.setTextSize(40);
27             //设置按钮四周的空白区域
28             bn.setPadding(5,35,5,35);
29             //指定该组件所在的行
30             GridLayout.Spec rowSpec = GridLayout.spec(i/4+2);
31             //指定该组件所在的列
32             GridLayout.Spec columnSpec=GridLayout.spec(i%4);
33             GridLayout.LayoutParams params = new GridLayout.LayoutParams(rowSpec,columnSpec);
34             //指定该组件占满父容器
35             params.setGravity(Gravity.FILL);
36             gridLayout.addView(bn,params);
37         }
38     }
39 
40 
41 }