Android开发 ---基本UI组件5:监听下拉选项,动态绑定下拉选项、全选/反选,取多选按钮的值,长按事件,长按删除,适配器的使用,提示查询数据,activity控制多按钮

效果图:

  效果描述:

    1、当点击 1 按钮后,进入选择城市的页面,会监听到你选中的城市名称;动态为Spinner绑定数据

    2、当点击 2 按钮后,进入自动查询数据页面,只要输入首字母,就会动态查找以该字母为首字母的单词

    3、当点击 3 按钮后,进入一个列表中,会监听到你点击的列表;会监听你长按的列表;会全选/反选复选框;能获取选中的数据

    4、当点击 4 按钮后,进入一个列表中,这里会设置每一列的数据

 

1、activity_main.xml

  描述:

    定义了四个按钮

      第一个:下拉列表

      第二个:自动查询数据

      第三个:全选/反选  和 listView取值

      第四个:设计一个ListView的内容

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <Button
        android:id="@+id/btn1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Spinner"/>
    <Button
        android:id="@+id/btn2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="AutoCompleteTextView"/>
    <Button
        android:id="@+id/btn3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="ListView"/>
    <Button
        android:id="@+id/btn4"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="ListView_2"/>
</LinearLayout>

2、MainActivity.java

  描述:

    设置了一个按钮点击监听事件,实现在一个Activity中控制多个按钮

package com.example.andorid_ui_2;

import android.app.Activity;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ListView;
public class MainActivity extends Activity implements View.OnClickListener{ private Button btn1; private Button btn2; private Button btn3; private Button btn4; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); btn1=(Button) findViewById(R.id.btn1); btn1.setOnClickListener(this); btn2=(Button) findViewById(R.id.btn2); btn2.setOnClickListener(this); btn3=(Button) findViewById(R.id.btn3); btn3.setOnClickListener(this); btn4=(Button) findViewById(R.id.btn4); btn4.setOnClickListener(this); } @Override public void onClick(View view) { Intent intent = null; switch (view.getId()){ case R.id.btn1: intent=new Intent(this,SpinnerActivity.class); break; case R.id.btn2: intent=new Intent(this,AutoCompleteActivity.class); break; case R.id.btn3: intent=new Intent(this,ListActivity.class); break; case R.id.btn4: intent=new Intent(this,ListViewActivity.class); break; } if (intent!=null) startActivity(intent); } }

下列列表



1、activity_spinner.xml

  描述:

    定义了两个下拉列表供用户选择相应的城市名称

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:id="@+id/activity_spinner"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <TextView
        android:text="请选择城市"
        android:textSize="30sp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    <Spinner
        android:id="@+id/spinner_1"
        android:entries="@array/citys"
        android:spinnerMode="dialog"
        android:prompt="@string/select_city"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="2dp"
        android:background="@android:color/holo_orange_light"/>
    <TextView
        android:text="请选择城市"
        android:textSize="30sp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    <Spinner
        android:id="@+id/spinner_2"
        android:spinnerMode="dialog"
        android:prompt="@string/select_city"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>
</LinearLayout>

2、修改资源文件Strings.xml 

  描述:

    资源文件中定义好一些城市名

<resources>
    <string name="app_name">Android_UI_2</string>

    <string name="select_city">请选择城市</string>
    <array name="citys">
        <item>北京</item>
        <item>上海</item>
        <item>广州</item>
        <item>深圳</item>
        <item>珠海</item>
        <item>中山</item>
        <item>江门</item>
    </array>
</resources>

3、SpinnerActivity.java

  

package com.example.andorid_ui_2;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.Toast;

public class SpinnerActivity extends Activity {
  //获取下拉列表控件
    private Spinner spinner_1,spinner_2;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_spinner);

        spinner_1=(Spinner)findViewById(R.id.spinner_1);
     //获取到你当前选中的项转化为字符串 String city
=spinner_1.getSelectedItem().toString();
     //弹出你选中的项的内容
//Toast.makeText(this,"默认选择:"+city,Toast.LENGTH_SHORT).show(); //监听选择改变事件 spinner_1.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { @Override
       //Adapter是适配器,
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) { //从资源中取出所有的城市 String[] citys=getResources().getStringArray(R.array.citys);
         //弹出你选中的城市名称 Toast.makeText(SpinnerActivity.
this,"选择:"+citys[i],Toast.LENGTH_SHORT).show(); } @Override public void onNothingSelected(AdapterView<?> adapterView) { } }); //==============动态为Spinner绑定数据================// spinner_2=(Spinner)findViewById(R.id.spinner_2); String[] citys={"武汉","重庆","成都","锦州","荆门","襄阳"}; //构建一个ArrayAdapter对象 ArrayAdapter adapter=new ArrayAdapter(this,android.R.layout.simple_spinner_dropdown_item,citys); spinner_2.setAdapter(adapter); } }


自动查询数据



1、activity_auto_complete.xml

  描述:

    AutoCompleteTextView  自动提示文本内容控件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/activity_auto_complete"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <AutoCompleteTextView
        android:id="@+id/autoText"
        android:completionHint="根据名称查找"
        android:completionThreshold="1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
</LinearLayout>

2、AutoCompleteActivity.java

package com.example.andorid_ui_2;
import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;

public class AutoCompleteActivity extends Activity {
  //获取控件
    private AutoCompleteTextView autoText;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_auto_complete);
     
        autoText=(AutoCompleteTextView)findViewById(R.id.autoText);
        //为autoText绑定数据源
        String[] names={"abc","aabc","abcd","acbb","accd","addc"};
     //构建ArrayAdapter对象,为AutocompleteView动态绑定数据 ArrayAdapter adapter
=new ArrayAdapter(this,android.R.layout.simple_list_item_1,names); autoText.setAdapter(adapter); } }


全选/反选  和 listView取值


1、activity_list.xml

   描述:

     橙色分割线:        

<LinearLayout
        android:layout_width="match_parent"
        android:layout_height="2dp"
        android:background="@color/colorPrimaryDark"/>

     选中的项颜色变为绿色:

        android:listSelector="@android:color/holo_green_light"

    

<?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:id="@+id/activity_list"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingTop="2dp"
    android:orientation="vertical">
    <ListView
        android:id="@+id/listView_1"
        android:entries="@array/citys"
        android:divider="@android:color/holo_orange_light"
        android:dividerHeight="1dp"
        android:listSelector="@android:color/holo_green_light"
        android:choiceMode="multipleChoice"
        android:keepScreenOn="true"
        android:layout_width="match_parent"
        android:layout_height="250dp"/>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="2dp"
        android:background="@color/colorPrimaryDark"/>
    <ListView
        android:id="@+id/listView_2"
        android:divider="@android:color/holo_orange_light"
        android:dividerHeight="1dp"
        android:choiceMode="multipleChoice"
        android:listSelector="@android:color/holo_green_light"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
        <Button
            android:layout_width="match_parent"
            android:layout_weight="1"
            android:onClick="doSelect"
            android:text="全选/反选"
            android:layout_height="wrap_content" />
        <Button
            android:layout_width="match_parent"
            android:layout_weight="1"
            android:onClick="getValues"
            android:text="取   值"
            android:layout_height="wrap_content" />
    </LinearLayout>
</LinearLayout>

2、ListActivity.java

  描述:

    单击和长按事件的使用

    长按删除选项

    动态绑定数据到listView

    

package com.example.andorid_ui_2;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

public class ListActivity extends Activity {
   //获取控件
    private ListView listView_1,listView_2;
    private ArrayAdapter adapter;
    private List userList;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_list);
listView_1
=(ListView)findViewById(R.id.listView_1);
     //获取资源文件中的城市
final String[] citys=getResources().getStringArray(R.array.citys); //ListView常用事件_单击 listView_1.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) { Toast.makeText(ListActivity.this,citys[i],Toast.LENGTH_SHORT).show(); } }); //长按事件 listView_1.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() { @Override public boolean onItemLongClick(AdapterView<?> adapterView, View view, int i, long l) { Toast.makeText(ListActivity.this,"长按:"+citys[i],Toast.LENGTH_SHORT).show(); return true; } }); //================为ListView动态绑定数据===================// listView_2=(ListView)findViewById(R.id.listView_2); userList=new ArrayList(); userList.add("小强");userList.add("小名"); userList.add("小陈");userList.add("小花");
     //构建ArrayAdapter对象 adapter
=new ArrayAdapter(this,android.R.layout.simple_list_item_multiple_choice,userList); listView_2.setAdapter(adapter); //长按时删除该项 listView_2.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() { @Override public boolean onItemLongClick(AdapterView<?> adapterView, View view, int i, long l) {
          //移除某一项数据 userList.remove(i);
adapter.notifyDataSetChanged();
return false; } }); } //执行全选或反选 public void doSelect(View view){ //获取当前被选中项的数量 int count=listView_2.getCheckedItemCount(); boolean isFlag=true;
     //如果有被选中的项,则isFlag的值就为false,否则则为true isFlag
=count>0?false:true; for (int i=0;i<listView_2.getCount();i++){ listView_2.setItemChecked(i,isFlag); } } //取出选中项的值 public void getValues(View view){
     //构建一个带有缓存数据的StringBuffer StringBuffer sb
=new StringBuffer(); for (int i=0;i<listView_2.getCount();i++){ if(listView_2.isItemChecked(i)){
          //将选中的数据追加并保存到sb sb.append(listView_2.getItemAtPosition(i)
+","); } }
     //转化为字符串弹出 Toast.makeText(
this,sb.toString(),Toast.LENGTH_LONG).show(); } }

一个ListView的内容



资源:

  

  

1、activity_List_View.xml

  描述:

    choiceMode的值有:1.none;2.singleChoice;3multipleChoice

    1是什么都没有,2是单选模式,3是多选模式

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/activity_list_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">
    <ListView
        android:id="@+id/userListView"
        android:divider="@android:color/holo_orange_light"
        android:dividerHeight="1dp"
        android:choiceMode="multipleChoice"
        android:listSelector="@android:color/holo_green_light"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>
</LinearLayout>

2、ListViewActivity.java

package com.example.andorid_ui_2;

import android.app.Activity;
import android.os.Bundle;
import android.widget.ListView;
import android.widget.SimpleAdapter;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;

public class ListViewActivity extends Activity {
  
    private ListView userListView;
  //适配器
private SimpleAdapter adapter; private List<Map<String,Object>> data; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_list_view);
       userListView
=(ListView)findViewById(R.id.userListView); //绑定数据 :用户头像、用户名、用户信息 String[] from={"userImage","userName","userInfo"};
     //通过id获取用户头像、用户名、用户信息
int[] to={R.id.userImage,R.id.userName,R.id.userInfo}; getData();
     //构建适配器 adapter
=new SimpleAdapter(this,data,R.layout.layout_userlist,from,to);  //绑定适配器
     userListView.setAdapter(adapter); }
private void getData(){ data=new ArrayList<Map<String,Object>>(); //每一项的数据 Map<String,Object> map=new HashMap<String,Object>(); map.put("userImage",R.drawable.user1); map.put("userName","张三"); map.put("userInfo","Android兴趣班班长"); data.add(map); map=new HashMap<String,Object>(); map.put("userImage",R.drawable.user2); map.put("userName","李四"); map.put("userInfo","Android兴趣班学习委员"); data.add(map); map=new HashMap<String,Object>(); map.put("userImage",R.drawable.user2); map.put("userName","小强"); map.put("userInfo","Android兴趣班组织委员"); data.add(map); map=new HashMap<String,Object>(); map.put("userImage",R.drawable.user1); map.put("userName","欧阳锋"); map.put("userInfo","Android兴趣班打酱油人员"); data.add(map); } }

3、layout_userlist.xml

  描述:

    用户头像

    用户名

    用户信息

    删除用户

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_marginLeft="5dp"
    >
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="70dp"
        android:orientation="horizontal">
        <ImageView
            android:id="@+id/userImage"
            android:layout_width="60dp"
            android:layout_height="70dp" />
        <LinearLayout
            android:orientation="horizontal"
            android:layout_marginLeft="3dp"
            android:layout_width="match_parent"
            android:layout_height="match_parent">
            <LinearLayout
                android:orientation="vertical"
                android:layout_weight="5"
                android:layout_width="0dp"
                android:layout_height="match_parent">
                <TextView
                    android:id="@+id/userName"
                    android:textSize="28sp"
                    android:layout_width="match_parent"
                    android:layout_height="40dp" />
                <TextView
                    android:id="@+id/userInfo"
                    android:textSize="20sp"
                    android:layout_width="match_parent"
                    android:layout_height="30dp" />
            </LinearLayout>
            <TextView
                android:id="@+id/deleteText"
                android:textSize="25sp"
                android:gravity="center"
                android:text="删除"
                android:layout_weight="1"
                android:layout_gravity="right"
                android:layout_width="0dp"
                android:layout_height="match_parent" />
        </LinearLayout>
    </LinearLayout>
</LinearLayout>
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原文地址:https://www.cnblogs.com/zn615/p/8204253.html