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 package com.example.administrator.testapp;
 2
 3 import android.os.Message;
 4 import android.support.v7.app.AppCompatActivity;
 5 import android.os.Bundle;
 6 import android.view.View;
 7 import android.os.Handler;
 8 import android.widget.Button;
 9 import android.widget.TextView;
10 import android.widget.Toast;
11 import java.util.Random;
12 import java.util.logging.LogRecord;
13
14 public class test_activity6 extends AppCompatActivity {
15
16     TextView tv_7;
17
18     Button bt_3,bt_4,bt_5;
19
20     @Override
21     protected void onCreate(Bundle savedInstanceState) {
22         super.onCreate(savedInstanceState);
23         setContentView(R.layout.activity_test_activity6);
24
25         tv_7 = (TextView) findViewById(R.id.tv_7);
26         bt_3 = (Button) findViewById(R.id.bt_3);
27         bt_4 = (Button) findViewById(R.id.bt_4);
28         bt_5 = (Button) findViewById(R.id.bt_5);
29 }
30
31        public void bt3_onclick(View v)
32     {
33         switch (v.getId())
34         {
35             case R.id.bt_3:
36                 //发送增加消息
37                 hl.sendEmptyMessage(1);
38                 break;
39             case R.id.bt_4:
40                 //发送减少消息
41                 hl.sendEmptyMessage(2);
42                 break;
43             case R.id.bt_5:
44                 //发送暂停消息
45                 hl.sendEmptyMessage(3);
46                 break;
47         }
48 int i = 10;
49     Handler hl = new Handler()
50     {
51         @Override
52         public void handleMessage(Message msg) {
53             super.handleMessage(msg);
54             switch (msg.what)
55             {
56                 //增加
57                 case 1:
58                     if (i==20)
59                     {
60                         Toast.makeText(test_activity6.this, "无法增加！", Toast.LENGTH_SHORT).show();
61                         return;
62                     }
63                     i++;
64                     tv_7.setText(i + "");
65                     //发送
66                     hl.sendEmptyMessageDelayed(1, 1000);
67                     hl.removeMessages(2);
68                     if (i>10)
69                     {
70                         bt_3.setClickable(false);
71                     }
72                     break;
73                 //减少
74                 case 2:
75                     if (i==1)
76                     {
77                         return;
78                     }
79                     i--;
80                     tv_7.setText(i+"");
81                     hl.sendEmptyMessageDelayed(2,1000);
82                     hl.removeMessages(1);
83                     if (i<10)
84                     {
85                         bt_4.setClickable(false);
86                     }
87                     else
88                     break;
89                 //暂停
90                 case 3:
91                     hl.removeMessages(1);
92                     hl.removeMessages(2);
93                     Toast.makeText(test_activity6.this, "完成暂停！", Toast.LENGTH_SHORT).show();
94                     break;
95             }
96         }
97 };