计算器界面

 

Demo2\jisuanqi\src\main\res\layout\activity_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>

 

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