View（视图）——AutoCompleteTextView、Spinner

AutoCompleteTextView

一.自动提示文本输入框且不区分大小写

二.适配器ArrayAdapter

1.数据源是String[ ]或集合，保存要提示的文本

2.layout文件

三.completionThreshold

1.设置提示需要的最小字符数

2.默认是2

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     xmlns:tools="http://schemas.android.com/tools"
 4     android:layout_width="match_parent"
 5     android:layout_height="match_parent"
 6     android:paddingBottom="@dimen/activity_vertical_margin"
 7     android:paddingLeft="@dimen/activity_horizontal_margin"
 8     android:paddingRight="@dimen/activity_horizontal_margin"
 9     android:paddingTop="@dimen/activity_vertical_margin"
10     tools:context="com.hanqi.testapp2.TestActivity11"
11     android:orientation="vertical">
12 
13     <AutoCompleteTextView
14         android:layout_width="match_parent"
15         android:layout_height="wrap_content"
16         android:hint="请输入..."
17         android:id="@+id/at_1"
18         android:completionThreshold="1"/>
19 </LinearLayout>

.xml

 1 package com.hanqi.testapp2;
 2 
 3 import android.app.Notification;
 4 import android.app.NotificationManager;
 5 import android.app.PendingIntent;
 6 import android.content.Intent;
 7 import android.os.Bundle;
 8 import android.support.v7.app.AppCompatActivity;
 9 import android.view.View;
10 import android.widget.AdapterView;
11 import android.widget.ArrayAdapter;
12 import android.widget.AutoCompleteTextView;
13 import android.widget.Spinner;
14 import android.widget.Toast;
15 
16 public class TestActivity11 extends AppCompatActivity {
17 
18     AutoCompleteTextView at_1;
19  @Override
20     protected void onCreate(Bundle savedInstanceState) {
21         super.onCreate(savedInstanceState);
22         setContentView(R.layout.activity_test11);
23 
24         at_1=(AutoCompleteTextView)findViewById(R.id.at_1);
25 //准备数据源
26         String[]strings={"abc","And","bea","car","abcde","AAAaaa","anddd"};
27 
28         //准备适配器
29         ArrayAdapter<String> aa=new ArrayAdapter<String>(this,R.layout.array_adapter,strings);
30 
31         //给组件构建适配器
32         at_1.setAdapter(aa);
33  }
34 }

.Java

Spinner

一.概念：下拉列表框

二.适配器ArrayAdapter

1.数据源是String[ ]或集合，保存要提示的文本

2.layout文件

三.监听器AdapterView.OnItemSelectedListener()

1.void onItemSelected(AdapterView<?> parent, View view, int position, long id)

2.void onNothingSelected(AdapterView<?> parent)

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     xmlns:tools="http://schemas.android.com/tools"
 4     android:layout_width="match_parent"
 5     android:layout_height="match_parent"
 6     android:paddingBottom="@dimen/activity_vertical_margin"
 7     android:paddingLeft="@dimen/activity_horizontal_margin"
 8     android:paddingRight="@dimen/activity_horizontal_margin"
 9     android:paddingTop="@dimen/activity_vertical_margin"
10     tools:context="com.hanqi.testapp2.TestActivity11"
11     android:orientation="vertical">
12 <LinearLayout
13         android:layout_width="match_parent"
14         android:layout_height="wrap_content">
15         <TextView
16             android:layout_width="wrap_content"
17             android:layout_height="wrap_content"
18             android:text="学历："/>
19         <Spinner
20             android:layout_width="0dp"
21             android:layout_weight="1"
22             android:layout_height="wrap_content"
23             android:id="@+id/sp_1"></Spinner>
24     </LinearLayout>
25 </LinearLayout>

.xml

 1 package com.hanqi.testapp2;
 2 
 3 import android.app.Notification;
 4 import android.app.NotificationManager;
 5 import android.app.PendingIntent;
 6 import android.content.Intent;
 7 import android.os.Bundle;
 8 import android.support.v7.app.AppCompatActivity;
 9 import android.view.View;
10 import android.widget.AdapterView;
11 import android.widget.ArrayAdapter;
12 import android.widget.AutoCompleteTextView;
13 import android.widget.Spinner;
14 import android.widget.Toast;
15 
16 public class TestActivity11 extends AppCompatActivity {
17 
18  Spinner sp_1;
19  @Override
20     protected void onCreate(Bundle savedInstanceState) {
21         super.onCreate(savedInstanceState);
22         setContentView(R.layout.activity_test11);
23 
24         sp_1=(Spinner)findViewById(R.id.sp_1);
25 //下拉列表
26         final String[] xl={"高中","专科","本科","硕士","博士"};
27 
28         ArrayAdapter<String> sp=new ArrayAdapter<String>(this,R.layout.array_adapter,xl);
29 
30         sp_1.setAdapter(sp);
31 
32         //监听
33         sp_1.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
34             @Override
35             public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
36 
37                 Toast.makeText(TestActivity11.this, "选中的项目是"+xl[position], Toast.LENGTH_SHORT).show();
38             }
39 
40             @Override
41             public void onNothingSelected(AdapterView<?> parent) {
42 
43                 Toast.makeText(TestActivity11.this, "什么也没选", Toast.LENGTH_SHORT).show();
44 
45             }
46         });
47 
48     }
49 }

.Java