Android Listview

2022-12-06 13:56:31

方法一：

xml文件

<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:orientation="vertical"

    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" >

    <ListView

        android:id="@+id/listView1"

        android:choiceMode="singleChoice"

        android:layout_width="match_parent"

        android:layout_height="318dp"

        android:layout_weight="0.73"

        android:entries="@array/spinner" >

    </ListView>

    <EditText

        android:id="@+id/editText1"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:ems="10"

        android:inputType="textMultiLine" >

        <requestFocus />

    </EditText>

</LinearLayout>

java 文件

package com.example.listview;

import android.os.Bundle;

import android.app.Activity;

import android.view.Menu;

import android.widget.ArrayAdapter;

import android.widget.ListView;

public class MainActivity extends Activity {

ListView mListView;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        showListview();

    }

    private void showListview()

    {

    mListView=(ListView) findViewById(R.id.listView1);

    String[] COUNTRIES = new String[] { "Angola ", "Afghanis", "A,lbania", ",lgeria", ",ndorra", ",nguilla", "Ant,igua ", "Argen,tin", "Armenia,", "Ascens,o", "Australi", "Austria" ,"Azerbaij" ,"Bahamas", "B,ahrain", ",anglade", ",arbados", "Bel,arus", "Belgi,um", "Beli,e ", "Beni, ", "Bermuda ,", "Bolivia" , "Botswana" ,"Brazil " ,"Brunei ", "B,ulgaria", "Bur,kina-", "Burma, ", "Burundi", "Cameroon", "Canada " ,"Cayman I" ,"Central ", "C,had ", "Chile, ", "China ", "Colombia" ,"Congo ", ",Cook Is.", "C,osta Ri", "Cu,ba ", "Cyprus, ", "Czech , ", "Denmark" , "Djibouti" ,"Dominica" ,"Ecuador" , "E,gypt ", "EI S,alva", "Est,nia" , "Ethiop,ia", "Fiji ", "Finland" , "France " ,"French G", "G,abon ", "G,mbia ", "Geor,gia", "Germ,any" , "Gha,a ", "Gibralt,a", "Greece ", "Grenada", "Guam ", "Gu,atemal", "G,inea ", "G,yana ", "Hai,ti ", "Hondur,as", "Hongkong,", "Hungary", "Iceland", "India " ,"Indonesi", "I,ran ", "Iraq ", "Ireland", "Israel ", "Italy ", "I,vory Co", ",amaica" , ",apan ", "Jor,dan ", "Kampu,che", "Kazak,sta", "Kenya, ", "Korea, ", "Kuwait ", "Kyrgyzst", "Laos ", "La,tvia ", "L,banon" , "Les,otho" , "Liber,ia" , "Libya ,", "Liechten", "Lithuani" };

    //ArrayAdapter<String> arrayAdapter=new  ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, COUNTRIES);

    ArrayAdapter<String> arrayAdapter=new  ArrayAdapter<String>(this, android.R.layout.select_dialog_singlechoice, COUNTRIES);

    mListView.setAdapter(arrayAdapter);

    }

}

======================================

方法二：

 /**

 * @Title listviewDirect.java

 * @package     com.example.listview

 * @since

 * @version     1.0.0

 * @author      Vic Lee

 * @date        Aug 24, 2016-11:15:35 AM

 */

package com.example.listview;

import android.app.ListActivity;

import android.os.Bundle;

import android.widget.ArrayAdapter;

import android.widget.ListView;

public class listviewDirectActivity extends ListActivity {

ListView mListView;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        //setContentView(R.layout.activity_main);

        showlistviewDirect();

    }

    private void showlistviewDirect()

    {

        //mListView=getListView();

        String[] COUNTRIES = new String[] { "Angola ", "Afghanis", "A,lbania", ",lgeria", ",ndorra", ",nguilla", "Ant,igua ", "Argen,tin", "Armenia,", "Ascens,o", "Australi", "Austria" ,"Azerbaij" ,"Bahamas", "B,ahrain", ",anglade", ",arbados", "Bel,arus", "Belgi,um", "Beli,e ", "Beni, ", "Bermuda ,", "Bolivia" , "Botswana" ,"Brazil " ,"Brunei ", "B,ulgaria", "Bur,kina-", "Burma, ", "Burundi", "Cameroon", "Canada " ,"Cayman I" ,"Central ", "C,had ", "Chile, ", "China ", "Colombia" ,"Congo ", ",Cook Is.", "C,osta Ri", "Cu,ba ", "Cyprus, ", "Czech , ", "Denmark" , "Djibouti" ,"Dominica" ,"Ecuador" , "E,gypt ", "EI S,alva", "Est,nia" , "Ethiop,ia", "Fiji ", "Finland" , "France " ,"French G", "G,abon ", "G,mbia ", "Geor,gia", "Germ,any" , "Gha,a ", "Gibralt,a", "Greece ", "Grenada", "Guam ", "Gu,atemal", "G,inea ", "G,yana ", "Hai,ti ", "Hondur,as", "Hongkong,", "Hungary", "Iceland", "India " ,"Indonesi", "I,ran ", "Iraq ", "Ireland", "Israel ", "Italy ", "I,vory Co", ",amaica" , ",apan ", "Jor,dan ", "Kampu,che", "Kazak,sta", "Kenya, ", "Korea, ", "Kuwait ", "Kyrgyzst", "Laos ", "La,tvia ", "L,banon" , "Les,otho" , "Liber,ia" , "Libya ,", "Liechten", "Lithuani" };

        ArrayAdapter<String> arrayAdapter=new  ArrayAdapter<String>(this, android.R.layout.select_dialog_singlechoice, COUNTRIES);

        setListAdapter(arrayAdapter);

    }

}

错误：

- ::52.402: E/AndroidRuntime(): java.lang.RuntimeException: Unable to start activity ComponentInfo

{com.example.listview/com.example.listview.listviewDirectActivity}: java.lang.NullPointerException

解决办法：

因为listview 自动已经生成了id ,所以引用已经生成的id即可 在xml 页面。android:id="@android:id/list"

listview 增加

<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:orientation="vertical"

    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" >

    <ListView

        android:id="@android:id/list"

        android:layout_width="match_parent"

        android:layout_height="186dp"

        android:layout_weight="0.87" >

    </ListView>

    <EditText

        android:id="@+id/editText1"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:ems="10"

        android:inputType="textMultiLine" >

        <requestFocus />

    </EditText>

</LinearLayout>

package com.example.listviw1;

import java.util.ArrayList;

import java.util.List;

import android.os.Bundle;

import android.app.Activity;

import android.app.ListActivity;

import android.view.KeyEvent;

import android.view.Menu;

import android.view.View;

import android.view.View.OnKeyListener;

import android.widget.ArrayAdapter;

import android.widget.EditText;

public class MainActivity extends ListActivity {

EditText mEditText;

ArrayAdapter<String> arrayAdapter;

List<String> mlistStrings;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        showListview1();

    }

private void showListview1()

{

    mlistStrings=new  ArrayList<String>();

    arrayAdapter=new  ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, mlistStrings);

    mEditText=(EditText) findViewById(R.id.editText1);
    setListAdapter(arrayAdapter);

    mEditText.setOnKeyListener(new  OnKeyListener() {

        @Override

        public boolean onKey(View v, int keyCode, KeyEvent event) {

            if (keyCode==KeyEvent.KEYCODE_ENTER&& event.getAction()==KeyEvent.ACTION_UP)

            {

             mlistStrings.add(mEditText.getText().toString());

            // setListAdapter(arrayAdapter);//慢

             arrayAdapter.notifyDataSetChanged();//快

             mEditText.setText(null);

            }

            return false;

        }

    });

}

}

删除列表

@Override

protected void onListItemClick(ListView l, View v, int position, long id)

{

    // TODO Auto-generated method stub

    super.onListItemClick(l, v, position, id);

    mlistStrings.remove(position);

    arrayAdapter.notifyDataSetChanged();

}

CursorList

 /**

 * @Title Cursor_list.java

 * @package     com.example.listviw1

 * @since

 * @version     1.0.0

 * @author      Vic Lee

 * @date        Aug 24, 2016-1:53:16 PM

 */

package com.example.listviw1;

import android.app.ListActivity;

import android.database.Cursor;

import android.os.Bundle;

import android.provider.Contacts.Phones;

import android.widget.SimpleCursorAdapter;

public class Cursor_list extends ListActivity {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        // TODO Auto-generated method stub

        super.onCreate(savedInstanceState);

        //setContentView(R.layout.item_list);

        showCursorlist();

    }

private void showCursorlist()

{

    //1.数据集

    Cursor cursor=getContentResolver().query(Phones.CONTENT_URI, null, null, null, null);

    //2.adapter

    SimpleCursorAdapter simpleCursorAdapter=new  SimpleCursorAdapter(this, R.layout.item_list, cursor,

        new String[]{Phones.NAME,Phones.NUMBER},

        new int[]{R.id.textView1,R.id.textView2});

    //3.绑定

    setListAdapter(simpleCursorAdapter);

}

}

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical" >

    <TextView

        android:id="@+id/textView1"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:text="TextView" />

    <TextView

        android:id="@+id/textView2"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:text="TextView" />

</LinearLayout>

模拟器没有数据显示。。。

<uses-permission android:name="android.permission.READ_CONTACTS"></uses-permission>

===============

MyExpandableListViewActivity

 /**

 * @Title MyExpandableListViewActivity.java

 * @package     com.example.listviw1

 * @since

 * @version     1.0.0

 * @author      Vic Lee

 * @date        Aug 24, 2016-2:48:54 PM

 */

package com.example.listviw1;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import android.app.ExpandableListActivity;

import android.os.Bundle;

import android.view.View;

import android.widget.ExpandableListAdapter;

import android.widget.ExpandableListView;

import android.widget.SimpleExpandableListAdapter;

public class MyExpandableListViewActivity extends ExpandableListActivity

{

    @Override

    public boolean onChildClick(ExpandableListView parent, View v,

            int groupPosition, int childPosition, long id) {

        // TODO Auto-generated method stub

        return super.onChildClick(parent, v, groupPosition, childPosition, id);

    }

    @Override

    public void onGroupCollapse(int groupPosition) {

        // TODO Auto-generated method stub

        super.onGroupCollapse(groupPosition);

    }

    @Override

    public void onGroupExpand(int groupPosition) {

        // TODO Auto-generated method stub

        super.onGroupExpand(groupPosition);

    }

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        //1.//build data source

        List<HashMap<String, String>> groupData=new  ArrayList<HashMap<String,String>>();

        HashMap<String, String> _map=new HashMap<String, String>();

        _map.put("Name", "LD1");

        groupData.add(_map);

        _map=new HashMap<String, String>();

        _map.put("Name", "LD2");

        groupData.add(_map);

        _map=new HashMap<String, String>();

        _map.put("Name", "changsha");

        groupData.add(_map);

        _map=new HashMap<String, String>();

        List<List<HashMap<String, String>>> childData=new  ArrayList<List<HashMap<String,String>>>();

        List<HashMap<String, String>> childItem=new  ArrayList<HashMap<String,String>>();

        HashMap<String, String> _mapchild=new  HashMap<String, String>();

        _mapchild.put("Name", "LD11");

        _mapchild.put("Name", "LD22");

        _mapchild.put("Adrress", "changsha1");

        childItem.add(_mapchild);

        childData.add(childItem);

        childData.add(childItem);

        childData.add(childItem);

        //2.build data source and bind data source

        ExpandableListAdapter expandableListAdapter

        =new SimpleExpandableListAdapter(this,

                groupData,

                android.R.layout.simple_expandable_list_item_1,

                android.R.layout.simple_expandable_list_item_1,

                new String[]{"Name","Adrress"},

                new int[]{android.R.id.text1,android.R.id.text2},

                childData,

                android.R.layout.simple_expandable_list_item_2,

                new String[]{"Name","Adrress"},

                new int[]{android.R.id.text1,android.R.id.text2});

        //3.bind UI

        setListAdapter(expandableListAdapter);

    }

}

tab

 /**

 * @Title MyTabActivity.java

 * @package     com.example.listviw1

 * @since

 * @version     1.0.0

 * @author      Vic Lee

 * @date        Aug 24, 2016-6:41:38 PM

 */

package com.example.listviw1;

import android.R.anim;

import android.R.drawable;

import android.app.Activity;

import android.app.TabActivity;

import android.content.Intent;

import android.graphics.drawable.Drawable;

import android.os.Bundle;

import android.widget.TabHost;

import android.widget.TabHost.TabSpec;

@SuppressWarnings("deprecation")

public class MyTabActivity extends  TabActivity {

    @Override

    protected void onChildTitleChanged(Activity childActivity,

            CharSequence title) {

        // TODO Auto-generated method stub

        super.onChildTitleChanged(childActivity, title);

    }

    @SuppressWarnings("deprecation")

    @Override

    public void onContentChanged() {

        // TODO Auto-generated method stub

        super.onContentChanged();

    }

    @SuppressWarnings("deprecation")

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        Drawable drawable1 =getResources().getDrawable(android.R.drawable.ic_dialog_email);

        Drawable drawable2 =getResources().getDrawable(android.R.drawable.ic_dialog_map);

        Drawable drawable3 =getResources().getDrawable(android.R.drawable.ic_dialog_info);

        TabHost tabHost=getTabHost();

        TabSpec tabSpec1=tabHost.newTabSpec("Tab1").setIndicator("",drawable1)

                .setContent(new Intent(this, MyExpandableListViewActivity.class));

        tabHost.addTab(tabSpec1);

        TabSpec tabSpec2=tabHost.newTabSpec("Tab2").setIndicator("",drawable2)

                .setContent(new Intent(this, Cursor_list.class));

        tabHost.addTab(tabSpec2);

        TabSpec tabSpec3=tabHost.newTabSpec("Tab3").setIndicator("",drawable3)

                .setContent(new Intent(this, MySlidingDrawerActivity.class));

        tabHost.addTab(tabSpec3);

    }

}

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