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Android CheckBox和ImageView、Textview在ListView中显示
来源:互联网   发布日期:2015-10-03 11:20:57   浏览:2195次  

导读:1.首先创建一个适配器类CheckBoxListViewAdapter,此类继承BaseAdapter类:package com.test;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import an......

1.首先创建一个适配器类CheckBoxListViewAdapter,此类继承BaseAdapter类:

package com.test;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import android.app.Activity;

import android.content.Context;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import android.widget.CheckBox;

import android.widget.ImageView;

import android.widget.TextView;

public class CheckBoxListViewAdapter extends BaseAdapter{

//Inflater英文意思是膨胀,在Android中应该是扩展的意思吧。LayoutInflater的作用类似于

//findViewById(),不同点是LayoutInflater是用来找layout文件夹下的xml布局文件,并且实例化!

//而 findViewById()是找具体某一个xml下的具体 widget控件(如:Button,TextView等)。

private LayoutInflater mInflater;

private List<Map<String, Object>> mData;

public static Map<Integer, Boolean> isSelected;//记录checkbox状态的

String[]string ={"Android","IOS","Windows Phone","WebOs","Blackberry"};

int[] img ={R.drawable.android,R.drawable.ios,R.drawable.windowshone,R.drawable.webos,R.drawable.blackberry};

public CheckBoxListViewAdapter(Context context) {

mInflater = LayoutInflater.from(context);

init();

}

//初始化

private void init() {

mData=new ArrayList<Map<String, Object>>();

for (int i = 0; i < 5; i++) {

Map<String, Object> map = new HashMap<String, Object>();

map.put("img", img[i]);

map.put("title", string[i]);

mData.add(map);

}

//这儿定义isSelected这个map是记录每个listitem的状态,初始状态全部为false。

isSelected = new HashMap<Integer, Boolean>();

for (int i = 0; i < mData.size(); i++) {

isSelected.put(i, false);

}

}

public int getCount() {

return mData.size();

}

public Object getItem(int position) {

return

null;

}

public long getItemId(int position) {

return

0;

}

public View getView(int position, View convertView, ViewGroup parent) {

ViewHolder holder = null;

//convertView为null的时候初始化convertView。

if (convertView == null) {

holder = new ViewHolder();

convertView = mInflater.inflate(R.layout.my_data, null);

holder.img = (ImageView) convertView.findViewById(R.id.img);

holder.title = (TextView) convertView.findViewById(R.id.title);

holder.cBox = (CheckBox) convertView.findViewById(R.id.cb);

convertView.setTag(holder);

} else {

holder = (ViewHolder) convertView.getTag();

}

holder.img.setBackgroundResource((Integer) mData.get(position).get( "img"));

holder.title.setText(mData.get(position).get("title").toString());

holder.cBox.setChecked(isSelected.get(position));

return convertView;

}

public final class ViewHolder {

public ImageView img;

public TextViewtitle;

public CheckBoxcBox;

}

}

2.接下来定义布局文件my_data.xml,此布局文件中定义是在listView显示的组件信息

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

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

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:orientation="horizontal" >

<ImageView

android:id="@+id/img"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_gravity="center_vertical"/>

<TextView

android:id="@+id/title"

android:textSize="18dip"

android:layout_weight="1"

android:textStyle="bold"

android:gravity="center_horizontal|center_vertical"

android:layout_width="wrap_content"

android:layout_height="wrap_content"/>

<CheckBox

android:id="@+id/cb"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:focusable="false"

android:focusableInTouchMode="false"

android:clickable="false"

android:checkMark="?android:attr/listChoiceIndicatorMultiple"/>

</LinearLayout>

3.接下来定义my_list.xml显示布局文件

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

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

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:orientation="vertical" >

<ListView

android:id="@+id/lv"

android:layout_width="fill_parent"

android:layout_height="wrap_content"/>

</LinearLayout>

4.接下来就是TestQActivity

package com.test;

import com.test.CheckBoxListViewAdapter.ViewHolder;

import android.app.Activity;

import android.database.Cursor;

import android.os.Bundle;

import android.view.View;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemClickListener;

import android.widget.ArrayAdapter;

import android.widget.ListAdapter;

import android.widget.ListView;

import android.widget.SimpleCursorAdapter;

public class TestQActivity extends Activity {

/** Called when the activity is first created. */

privateListViewlistview;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.my_list);

listview =(ListView)findViewById(R.id.lv);

CheckBoxListViewAdaptercheckBoxListViewAdapter=new CheckBoxListViewAdapter(this);

listview.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);

listview.setItemsCanFocus(false);

listview.setAdapter((ListAdapter) checkBoxListViewAdapter);

listview.setOnItemClickListener(clickListener);

listview.getCheckedItemPositions();

}

private OnItemClickListenerclickListener =new OnItemClickListener() {

@Override

public void onItemClick(AdapterView<?> parent, View view, int position,

long id) {

ViewHolder vHollder = (ViewHolder) view.getTag();

//在每次获取点击的item时将对于的checkbox状态改变,同时修改map的值。

vHollder.cBox.toggle();

CheckBoxListViewAdapter.isSelected.put(position, vHollder.cBox.isChecked());

}

};

}

运行效果如下:

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相关热词: CheckBox ImageView Textview Li

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