数字增加项目总结

1.AndroidManifest.xml

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
 3     package="com.example.administrator.testapp">
 4 
 5     <application
 6         android:allowBackup="true"
 7         android:icon="@mipmap/ic_launcher"
 8         android:label="@string/app_name"
 9         android:supportsRtl="true"
10         android:theme="@style/AppTheme">
11         <activity android:name=".MainActivity"></activity>
12         <activity android:name=".test_activity6">
13             <intent-filter>
14                 <action android:name="android.intent.action.MAIN" />
15                 <category android:name="android.intent.category.LAUNCHER" />
16             </intent-filter>
17         </activity>
18     </application>
19 
20 </manifest>

2.界面布局代码

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout
 3     xmlns:android="http://schemas.android.com/apk/res/android"
 4     xmlns:tools="http://schemas.android.com/tools"
 5     android:layout_width="match_parent"
 6     android:layout_height="match_parent"
 7     tools:context="com.example.administrator.testapp.test_activity6"
 8     android:orientation="vertical">
 9 
10 <TextView
11         android:layout_width="wrap_content"
12         android:layout_height="wrap_content"
13         android:text="10"
14         android:textSize="30dp"
15         android:id="@+id/tv_7"
16         android:layout_gravity="center"/>
17     <Button
18         android:layout_width="match_parent"
19         android:layout_height="wrap_content"
20         android:text="增加"
21         android:textSize="30dp"
22         android:onClick="bt3_onclick"
23         android:id="@+id/bt_3"/>
24     <Button
25         android:layout_width="match_parent"
26         android:layout_height="wrap_content"
27         android:text="减少"
28         android:textSize="30dp"
29         android:onClick="bt3_onclick"
30         android:id="@+id/bt_4"/>
31     <Button
32         android:layout_width="match_parent"
33         android:layout_height="wrap_content"
34         android:text="暂停"
35         android:textSize="30dp"
36         android:onClick="bt3_onclick"
37         android:id="@+id/bt_5"/>
38 </LinearLayout>

3.代码运行程序

 1 int i = 10;
 2     Handler hl = new Handler()
 3     {
 4         @Override
 5         public void handleMessage(Message msg) {
 6             super.handleMessage(msg);
 7             switch (msg.what)
 8             {
 9                 //增加
10                 case 1:
11 
12                     bt_3.setEnabled(false);
13                     bt_4.setEnabled(true);
14                     bt_5.setEnabled(true);
15 
16                     if (i==20)
17                     {
18                         bt_5.setEnabled(false);
19                         Toast.makeText(test_activity6.this, "无法增加！", Toast.LENGTH_SHORT).show();
20                         return;
21                     }
22                     i++;
23                     tv_7.setText(i + "");
24                     //发送
25                     hl.sendEmptyMessageDelayed(1, 1000);
26                     hl.removeMessages(2);
27                     if (i>10)
28                     {
29                         bt_3.setEnabled(false);
30                     }
31                     break;
32                 //减少
33                 case 2:
34                     bt_3.setEnabled(true);
35                     bt_4.setEnabled(false);
36                     bt_5.setEnabled(true);
37                     if (i==1)
38                     {
39                         bt_5.setEnabled(false);
40                         Toast.makeText(test_activity6.this, "无法减少！", Toast.LENGTH_SHORT).show();
41                         return;
42                     }
43                     i--;
44                     tv_7.setText(i+"");
45                     hl.sendEmptyMessageDelayed(2,1000);
46                     hl.removeMessages(1);
47                     if (i<10)
48                     {
49                         bt_4.setEnabled(false);
50                     } else
51                     break;
52                     //暂停
53                 case 3:
54                     bt_3.setEnabled(true);
55                     bt_4.setEnabled(true);
56                     bt_5.setEnabled(false);
57                     hl.removeMessages(1);
58                     hl.removeMessages(2);
59                     Toast.makeText(test_activity6.this, "完成暂停！", Toast.LENGTH_SHORT).show();
60                     break;
61             }
62         }
63     };