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

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.hanqi.testapp2.TestActivity11"
    android:orientation="vertical">

    <AutoCompleteTextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="请输入..."
        android:id="@+id/at_1"
        android:completionThreshold="1"/>
</LinearLayout>

package com.hanqi.testapp2;

import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.Spinner;
import android.widget.Toast;

public class TestActivity11 extends AppCompatActivity {

    AutoCompleteTextView at_1;
 @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_test11);

        at_1=(AutoCompleteTextView)findViewById(R.id.at_1);
//准备数据源
        String[]strings={"abc","And","bea","car","abcde","AAAaaa","anddd"};

        //准备适配器
        ArrayAdapter<String> aa=new ArrayAdapter<String>(this,R.layout.array_adapter,strings);

        //给组件构建适配器
        at_1.setAdapter(aa);
 }
}

  

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)

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.hanqi.testapp2.TestActivity11"
    android:orientation="vertical">
<LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="学历："/>
        <Spinner
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="wrap_content"
            android:id="@+id/sp_1"></Spinner>
    </LinearLayout>
</LinearLayout>

package com.hanqi.testapp2;

import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.Spinner;
import android.widget.Toast;

public class TestActivity11 extends AppCompatActivity {

 Spinner sp_1;
 @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_test11);

        sp_1=(Spinner)findViewById(R.id.sp_1);
//下拉列表
        final String[] xl={"高中","专科","本科","硕士","博士"};

        ArrayAdapter<String> sp=new ArrayAdapter<String>(this,R.layout.array_adapter,xl);

        sp_1.setAdapter(sp);

        //监听
        sp_1.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

                Toast.makeText(TestActivity11.this, "选中的项目是"+xl[position], Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {

                Toast.makeText(TestActivity11.this, "什么也没选", Toast.LENGTH_SHORT).show();

            }
        });

    }
}