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Android 复习基础笔记(36)
版权声明:本文为博主原创文章,未经博主允许不得转载。
Android-Spinner的使用以及两种适配器
Spinner是安卓提供的下拉列表的类。
首先它也和ListView大致差不多,三个步骤:
1.准备数据源
2.构造适配器
3.加载适配器
有安卓自带的布局,也有自定义的布局。然后就是监听事件。
ArrayAdapter第一种方式
布局文件:
<RelativeLayout 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=".MainActivity"
>
<TextView
android:id="@+id/id_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world"
android:textColor="@android:color/holo_red_dark"
android:textSize="18dp"
/>
<Spinner
android:id="@+id/id_spinner"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/id_text"
>
</Spinner>
</RelativeLayout>
主活动:
监听事件实现AdapterView.OnItemSelectedListener接口
package com.xieth.as.spinnerdemo;
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.Spinner;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity implements AdapterView.OnItemSelectedListener {
private TextView tv = null;
private Spinner spinner = null;
// 数据源
private String[] city = {"北京", "上海", "广州", "深圳", "长沙", "南京", "杭州"};
private List<String> list = null;
private ArrayAdapter adapter = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initViews();
setData();
adapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1, list);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);
spinner.setOnItemSelectedListener(this);
}
private void setData() {
for (int i = 0; i < city.length; i++) {
list.add(city[i]);
}
}
private void initViews() {
list = new ArrayList<>();
tv = (TextView) findViewById(R.id.id_text);
spinner = (Spinner) findViewById(R.id.id_spinner);
}
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
String cityName = (String) adapter.getItem(position);
tv.setText(cityName);
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
}
运行效果:
SimpleAdapter自定义布局
其实感觉和ListView差不多,万变不离其踪。
item.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="10dp"
>
<ImageView
android:id="@+id/id_image"
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:src="@mipmap/chat_tool_audio"
/>
<TextView
android:id="@+id/id_text1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_marginLeft="20dp"
android:layout_toRightOf="@id/id_image"
android:text="123"
android:textColor="@android:color/background_dark"
android:textSize="15sp"
/>
</RelativeLayout>
主活动:
package com.xieth.as.spinnerdemo;
import android.annotation.TargetApi;
import android.os.Build;
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.SimpleAdapter;
import android.widget.Spinner;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class MainActivity extends AppCompatActivity implements AdapterView.OnItemSelectedListener {
private TextView tv = null;
private Spinner spinner = null;
// 数据源
private String[] city = {"北京", "上海", "广州", "深圳", "长沙", "南京"};
private int[] picId = {R.mipmap.chat_tool_audio, R.mipmap.chat_tool_camera, R.mipmap.chat_tool_location
,R.mipmap.chat_tool_photo, R.mipmap.chat_tool_send_file, R.mipmap.chat_tool_video};
private List<Map<String, Object>> dataList = null;
private List<String> list = null;
private ArrayAdapter adapter = null;
private SimpleAdapter simpleAdapter = null;
@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initViews();
setData();
adapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1, list);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
simpleAdapter = new SimpleAdapter(this, getData(), R.layout.item,
new String[] {"pic", "text"}, new int[]{R.id.id_image, R.id.id_text1});
spinner.setAdapter(simpleAdapter);
spinner.setOnItemSelectedListener(this);
spinner.setDropDownVerticalOffset(30);
}
private List<Map<String, Object>> getData() {
for (int i = 0; i < city.length; i++) {
Map<String, Object> map = new HashMap<>();
map.put("pic", picId[i]);
map.put("text", city[i]);
dataList.add(map);
}
return dataList;
}
private void setData() {
for (int i = 0; i < city.length; i++) {
list.add(city[i]);
}
}
private void initViews() {
dataList = new ArrayList<>();
list = new ArrayList<>();
tv = (TextView) findViewById(R.id.id_text);
spinner = (Spinner) findViewById(R.id.id_spinner);
}
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
String cityName = (String) adapter.getItem(position);
tv.setText(cityName);
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
运行效果:
几乎和ListView差不多。
对于Spinner这里有更加详细的描述
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- 1楼 seek_motorcade 2016-12-28 21:39发表 [回复]
- 想知道博主用的是什么模拟器,好像很6
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