• [2017-7-28]Android Learning Day6

     常用控件

    1. Spinner

    2. DatePickerDialog

    3. TimePickerDiaog

    4. RadioButton

    5. CheckBox

    spinner（下拉菜单）

    <Spinner
        android:id="@+id/spinner"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
     1 public class MainActivity extends AppCompatActivity {
 2 
 3     private Spinner s;
 4     private String[] dataSource = new String[]{"a1","b2","c3"};
 5 
 6     @Override
 7     protected void onCreate(Bundle savedInstanceState) {
 8         super.onCreate(savedInstanceState);
 9         setContentView(R.layout.activity_main);
10 
11         s = (Spinner) findViewById(R.id.spinner);
12         //设置一个Adapter
13         s.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, dataSource));
14 　　　　　//sOnSe                         OnIt
15         s.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
16             @Override
17             public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
18                 //在这里写监听事件
    　　　　　　　　　　　　System.out.println("用户选择的是"+dataSource[position]);
19             }
20 
21             @Override
22             public void onNothingSelected(AdapterView<?> parent) {
23 　　　　　　　　　　//不写
24             }
25         });
26     }
27 }

    DatePickerDialog（日期选择器）

    <Button
    android:id="@+id/button"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="选择日期" />
     1 public class ChooseDate extends AppCompatActivity {
 2 
 3     @Override
 4     protected void onCreate(Bundle savedInstanceState) {
 5         super.onCreate(savedInstanceState);
 6         setContentView(R.layout.activity_choose_date);
 7         slove();
 8     }
 9 
10     public void slove() {
11         findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {
12             @Override
13             public void onClick(View v) {
14                 new DatePickerDialog(ChooseDate.this, new DatePickerDialog.OnDateSetListener() {
15                     @Override
16                     public void onDateSet(DatePicker view, int year, int month, int dayOfMonth) {
17                         String chooseDate = String.format("%04d-%02d-%02d",year,month+1,dayOfMonth);//"%04d"总长度4位，不够用0补齐
18                         ((Button) findViewById(R.id.button)).setText(chooseDate);
19                     }
20                 },2000,0,1).show();//要注意月份是从0~11
21             }
22         });
23     }
24 }

    TimePickerDialog（时间选择器）

    这个就和日期选择器很像了

    <Button
        android:id="@+id/button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="选择时间" />
     1 public class ChooseTime extends AppCompatActivity {
 2 
 3     @Override
 4     protected void onCreate(Bundle savedInstanceState) {
 5         super.onCreate(savedInstanceState);
 6         setContentView(R.layout.activity_choose_date);
 7         slove();
 8     }
 9 
10     public void slove() {
11         findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {
12             @Override
13             public void onClick(View v) {
14                 new TimePickerDialog(ChooseTime.this, new TimePickerDialog.OnTimeSetListener() {
15                     @Override
16                     public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
17                         String chooseTime = String.format("%02d:%02d",hourOfDay,minute);
18                         ((Button) findViewById(R.id.button)).setText(chooseTime);
19                     }
20                 },0,0,true).show();//True是否使用24小时制
21             }
22         });
23     }
24 }

    RadioButton（单选框）

    这个要注意的是，单选按钮不能单独存在，要放在RadioGroup里

     1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:orientation="vertical">
 6     <LinearLayout
 7         android:layout_width="match_parent"
 8         android:layout_height="wrap_content"
 9         android:orientation="vertical"
10         android:layout_weight="1">
11 
12         <TextView
13             android:layout_width="match_parent"
14             android:layout_height="wrap_content"
15             android:layout_marginBottom="10dp"
16             android:textSize="18sp"
17             android:text="世界上最大的海洋是？"/>
18 
19         <RadioGroup
20             android:layout_width="match_parent"
21             android:layout_height="wrap_content" >
22 
23             <RadioButton
24                 android:id="@+id/rbA"
25                 android:layout_width="match_parent"
26                 android:layout_height="wrap_content"
27                 android:textSize="16sp"
28                 android:text="A.太平洋" />
29 
30             <RadioButton
31                 android:id="@+id/rbB"
32                 android:layout_width="match_parent"
33                 android:layout_height="wrap_content"
34                 android:textSize="16sp"
35                 android:text="B.北冰洋" />
36         </RadioGroup>
37 
38     </LinearLayout>
39 
40     <Button
41         android:id="@+id/chooseOne"
42         android:layout_width="match_parent"
43         android:layout_height="wrap_content"
44         android:text="提交"/>
45 
46 </LinearLayout>
     1 public class ChooseSingle extends AppCompatActivity {
 2 
 3     @Override
 4     protected void onCreate(Bundle savedInstanceState) {
 5         super.onCreate(savedInstanceState);
 6         setContentView(R.layout.activity_choose_single);
 7         slove();
 8     }
 9 
10     private void slove() {
11         findViewById(R.id.chooseOne).setOnClickListener(new View.OnClickListener() {
12             @Override
13             public void onClick(View v) {
14                 RadioButton rb = (RadioButton) findViewById(R.id.rbA);
15                 if(rb.isChecked()) {
16                     Toast.makeText(ChooseSingle.this, "正确", Toast.LENGTH_SHORT).show();
17                 }
18                 else {
19                     Toast.makeText(ChooseSingle.this, "错误", Toast.LENGTH_SHORT).show();
20                 }
21             }
22         });
23     }
24 }

    CheckBox（多选框）

     1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:orientation="vertical">
 6 
 7     <TextView
 8         android:id="@+id/tv1"
 9         android:layout_width="match_parent"
10         android:layout_height="wrap_content"
11         android:text="你喜欢喝什么饮料？" />
12 
13     <CheckBox
14         android:id="@+id/cb1"
15         android:layout_width="match_parent"
16         android:layout_height="wrap_content"
17         android:text="冰峰" />
18 
19     <CheckBox
20         android:id="@+id/cb2"
21         android:layout_width="match_parent"
22         android:layout_height="wrap_content"
23         android:text="果啤" />
24 
25     <CheckBox
26         android:id="@+id/cb3"
27         android:layout_width="match_parent"
28         android:layout_height="wrap_content"
29         android:text="雪碧" />
30 
31     <TextView
32         android:id="@+id/tv2"
33         android:layout_width="match_parent"
34         android:layout_height="wrap_content" />
35 </LinearLayout>
     1 package com.liwenchi.myapplication;
 2 
 3 import android.support.v7.app.AppCompatActivity;
 4 import android.os.Bundle;
 5 import android.view.View;
 6 import android.widget.CheckBox;
 7 import android.widget.CompoundButton;
 8 import android.widget.TextView;
 9 
10 public class MainActivity extends AppCompatActivity {
11 
12     private CheckBox cb1,cb2,cb3;
13     private TextView tv;
14 
15     @Override
16     protected void onCreate(Bundle savedInstanceState) {
17         super.onCreate(savedInstanceState);
18         setContentView(R.layout.activity_main);
19         slove();
20     }
21 
22     public void slove() {
23         cb1 = (CheckBox) findViewById(R.id.cb1);
24         cb2 = (CheckBox) findViewById(R.id.cb2);
25         cb3 = (CheckBox) findViewById(R.id.cb3);
26         tv = (TextView) findViewById(R.id.tv2);
27         cb1.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
28             @Override
29             public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
30                 onChanged();
31             }
32         });
33         cb2.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
34             @Override
35             public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
36                 onChanged();
37             }
38         });
39         cb3.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
40             @Override
41             public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
42                 onChanged();
43             }
44         });
45     }
46 
47     public void onChanged() {
48         String s = "我喜欢";
49         if(cb1.isChecked()) {
50             s += ","+cb1.getText();
51         }
52         if(cb2.isChecked()) {
53             s += ","+cb2.getText();
54         }
55         if(cb3.isChecked()) {
56             s += ","+cb3.getText();
57         }
58         tv.setText(s);
59     }
60 }
  • 相关阅读:
    HTML 图片文字滚动
    Request.QueryString的用法
    细线表格的制作
    photoshop的小小快捷键
    制作首页
    css
    编写BLL层
    完成新闻表操作类
    编写剩下的存储过程
    重构SQLHelper2
  • 原文地址：https://www.cnblogs.com/liwenchi/p/7247469.html
Copyright © 2020-2023  润新知