Android—高级控件（二）ListView
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一、ListView
案例: 仿设置页面（数据与设置页面不一致）
代码：
主布局
<?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"> <ListView android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/lv_list_list" ></ListView></LinearLayout>副一布局
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="horizontal" android:layout_width="fill_parent" android:layout_height="match_parent" android:padding="5dp"> <ImageView android:layout_width="wrap_content" android:layout_height="match_parent" android:background="@drawable/dog" android:id="@+id/iv_item1_ico" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/tv_item1_tv" android:layout_gravity="center" android:layout_marginLeft="10dp" android:text="测试数据" /></LinearLayout>
副二布局
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="match_parent" android:paddingLeft="10dp" android:gravity="center_vertical" android:background="#666666"> <TextView android:id="@+id/tv_item1_tv" android:layout_width="wrap_content" android:layout_height="20dp" android:textColor="#ffffff" android:text="金融考试" android:gravity="center_vertical"/></LinearLayout>
Java文件
package com.example.myapplication;import android.os.Bundle;import android.support.annotation.Nullable;import android.support.v7.app.AppCompatActivity;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.AdapterView;import android.widget.BaseAdapter;import android.widget.ListView;import android.widget.TextView;import android.widget.Toast;import java.util.ArrayList;import java.util.List;/** * Created by Administrator on 2017/6/8 0008. */public class ListViewActivity extends AppCompatActivity { private ListView lv_list_list; private List<String> list=null; private List<String> groupkey=new ArrayList<String>(); private List<String> aList = new ArrayList<String>(); private List<String> bList = new ArrayList<String>(); @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.listview); lv_list_list = (ListView) findViewById(R.id.lv_list_list); initData(); MyAdapter adapter=new MyAdapter(); lv_list_list.setAdapter(adapter); lv_list_list.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { Toast.makeText(ListViewActivity.this,list.get(position),Toast.LENGTH_SHORT).show(); } }); } public void initData(){ list = new ArrayList<String>(); groupkey.add("A组"); groupkey.add("B组"); for(int i=0; i<5; i++){ aList.add("A组"+i); } list.add("A组"); list.addAll(aList); for(int i=0; i<8; i++){ bList.add("B组"+i); } list.add("B组"); list.addAll(bList); } private class MyAdapter extends BaseAdapter{ @Override public int getCount() { return list.size(); } @Override public Object getItem(int position) { return list.get(position); } @Override public long getItemId(int position) { return position; } @Override public boolean isEnabled(int position) { if(groupkey.contains(getItem(position))){ return false; } return super.isEnabled(position); } @Override public View getView(int position, View convertView, ViewGroup parent) { View view=convertView; if(groupkey.contains(getItem(position))){ view= LayoutInflater.from(getApplicationContext()).inflate(R.layout.item2, null); }else{ view=LayoutInflater.from(getApplicationContext()).inflate(R.layout.item1, null); } TextView text=(TextView) view.findViewById(R.id.tv_item1_tv); text.setText((CharSequence) getItem(position)); return view; } }}实例：
代码：
布局文件
<?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"> <Spinner android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/sp_spinner_s1"> </Spinner> <Spinner android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/sp_spinner_s2" ></Spinner></LinearLayout>Java文件
package com.example.myapplication;import android.os.Bundle;import android.support.annotation.Nullable;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.Toast;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;/** * Created by Administrator on 2017/6/8 0008. */public class SpinnerActivity extends AppCompatActivity { private Spinner sp_spinner_s1; private Spinner sp_spinner_s2; private Map<Integer, SimpleAdapter> map3; @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_spinner); //获取控件 sp_spinner_s1 = (Spinner) findViewById(R.id.sp_spinner_s1); sp_spinner_s2 = (Spinner) findViewById(R.id.sp_spinner_s2); //省份数组 final String provinces[]={"湖南省","广东省","湖北省"}; Map<Integer,String[]> mapCity=new HashMap<>(); String city0[]={"长沙市","衡阳市","常德市"}; String city1[]={"广州市","东莞市","中山市"}; String city2[]={"武汉市","黄岗市","荆州市"}; mapCity.put(0,city0); mapCity.put(1,city1); mapCity.put(2,city2); //图片数组 int images[]={R.drawable.fox,R.drawable.dog,R.drawable.elephant}; //省 List<Map<String,Object>> list=new ArrayList<>(); for (int i = 0; i < provinces.length; i++) { Map<String,Object> map=new HashMap<>(); map.put("title",provinces[i]); map.put("image",images[i]); list.add(map); } //市 map3 = new HashMap<>(); for (int i = 0; i <3; i++) { List<Map<String,Object>> list2=new ArrayList<>(); for (int j = 0; j <3; j++) { Map<String,Object> map2=new HashMap<>(); map2.put("city",mapCity.get(i)[j]); list2.add(map2); } SimpleAdapter adapterProvince2=new SimpleAdapter(this,list2,android.R.layout.simple_list_item_1,new String[]{"city"},new int[]{android.R.id.text1}); map3.put(i,adapterProvince2); } //给省设置适配器 SimpleAdapter adapterProvince=new SimpleAdapter(this,list,android.R.layout.activity_list_item,new String[]{"title","image"},new int[]{android.R.id.text1,android.R.id.icon}); sp_spinner_s1.setAdapter(adapterProvince); //给省下拉列表设置选择事件 sp_spinner_s1.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { @Override public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { Toast.makeText(SpinnerActivity.this, provinces[position], Toast.LENGTH_SHORT).show(); sp_spinner_s2.setAdapter(map3.get(position)); } @Override public void onNothingSelected(AdapterView<?> parent) { } }); sp_spinner_s2.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { @Override public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { Toast.makeText(SpinnerActivity.this, provinces[position], Toast.LENGTH_SHORT).show(); } @Override public void onNothingSelected(AdapterView<?> parent) { } }); }}三、ExpandableListView（仿QQ好友列表）
实例：
布局文件
<?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"> <ExpandableListView android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/elv" android:layout_margin="5dp" > </ExpandableListView></LinearLayout>
副布局一
<?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"> <TextView android:id="@+id/parent_title" android:layout_width="match_parent" android:layout_height="wrap_content" android:textSize="20sp" android:textColor="#050505" android:textStyle="bold" android:text="这是父item" android:layout_margin="5dp"/></LinearLayout>
副布局二
<?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"> <TextView android:id="@+id/child_title" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="18sp" android:textColor="#050505" android:text="这是子item" android:layout_margin="5dp"/></LinearLayout>
Java代码：
package com.example.myapplication;import android.content.Context;import android.os.Bundle;import android.support.annotation.Nullable;import android.support.v7.app.AppCompatActivity;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseExpandableListAdapter;import android.widget.ExpandableListView;import android.widget.TextView;import android.widget.Toast;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;/** * Created by Administrator on 2017/6/8 0008. */public class ExpandableListViewActivity extends AppCompatActivity { private ExpandableListView elv; private Map<String, List<String>> dataset = new HashMap<>(); private String[] parentList = new String[]{"first", "second", "third"}; private List<String> childrenList1 = new ArrayList<>(); private List<String> childrenList2 = new ArrayList<>(); private List<String> childrenList3 = new ArrayList<>(); @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.expandablelistview); elv = (ExpandableListView) findViewById(R.id.elv); MyExpandableListViewAdapter adapter=new MyExpandableListViewAdapter(); initialData(); elv.setAdapter(adapter); } private void initialData() { childrenList1.add(parentList[0] + "-" + "first"); childrenList1.add(parentList[0] + "-" + "second"); childrenList1.add(parentList[0] + "-" + "third"); childrenList2.add(parentList[1] + "-" + "first"); childrenList2.add(parentList[1] + "-" + "second"); childrenList2.add(parentList[1] + "-" + "third"); childrenList3.add(parentList[2] + "-" + "first"); childrenList3.add(parentList[2] + "-" + "second"); childrenList3.add(parentList[2] + "-" + "third"); dataset.put(parentList[0], childrenList1); dataset.put(parentList[1], childrenList2); dataset.put(parentList[2], childrenList3); } private class MyExpandableListViewAdapter extends BaseExpandableListAdapter { // 获得父项的数量 @Override public int getGroupCount() { return dataset.size(); } // 获得某个父项的子项数目 @Override public int getChildrenCount(int groupPosition) { return dataset.get(parentList[groupPosition]).size(); } // 获得某个父项 @Override public Object getGroup(int groupPosition) { return dataset.get(parentList[groupPosition]); } @Override public Object getChild(int groupPosition, int childPosition) { return null; } // 获得某个父项的id @Override public long getGroupId(int groupPosition) { return groupPosition; } // 获得某个父项的某个子项的id @Override public long getChildId(int groupPosition, int childPosition) { return childPosition; } // 按函数的名字来理解应该是是否具有稳定的id，这个方法目前一直都是返回false，没有去改动过 @Override public boolean hasStableIds() { return false; } // 获得父项显示的view @Override public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { if (convertView == null) { LayoutInflater inflater = (LayoutInflater) ExpandableListViewActivity.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE); convertView = inflater.inflate(R.layout.listview2, null); } convertView.setTag(R.layout.listview2, groupPosition); convertView.setTag(R.layout.listview3, -1); TextView text = (TextView) convertView.findViewById(R.id.parent_title); text.setText(parentList[groupPosition]); return convertView; } // 获得子项显示的view @Override public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) { if (convertView == null) { LayoutInflater inflater = (LayoutInflater) ExpandableListViewActivity .this.getSystemService(Context.LAYOUT_INFLATER_SERVICE); convertView = inflater.inflate(R.layout.listview3, null); } convertView.setTag(R.layout.listview2, groupPosition); convertView.setTag(R.layout.listview3, childPosition); TextView text = (TextView) convertView.findViewById(R.id.child_title); text.setText(dataset.get(parentList[groupPosition]).get(childPosition)); text.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { Toast.makeText(ExpandableListViewActivity.this, "点到了内置的textview", Toast.LENGTH_SHORT).show(); } }); return convertView; } // 子项是否可选中，如果需要设置子项的点击事件，需要返回true @Override public boolean isChildSelectable(int groupPosition, int childPosition) { return false; } }}
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