Android ListView復雜多功能詳解

 

——————————————-activity_main.xml
<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" >

    <ListView
        android:id="@android:id/list"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
  

>
    </ListView>

</RelativeLayout>list_item.xml<?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="wrap_content" >

    <TextView
        android:id="@+id/item_text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="10dp"
        android:textSize="16sp"
        android:layout_weight="1"
        android:textStyle="bold" />

    <ImageView
        android:id="@+id/item_right"
   
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <ImageView
        android:id="@+id/item_right1"
     
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

 

 

 

——————————————.Main
package com.example.tezt;

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

import android.app.ListActivity;
import android.os.Bundle;
import android.view.Menu;

public class MainActivity extends
ListActivity {

@Override
public void onCreate(
Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

List<Map<String, Object>> datas = getDatas();
ImageAdapter adapter = new ImageAdapter(
this, datas);

this.getListView().setAdapter(
adapter);
}

private List<Map<String, Object>> getDatas() {
// TODO Auto-generated method stub
List<Map<String, Object>> results = new ArrayList<Map<String, Object>>();
String[] items = this
.getResources()
.getStringArray(
R.array.menu);

for (int i = 0; i < items.length; i++) {
Map<String, Object> item = new HashMap<String, Object>();
item.put("right1",
R.drawable.icon2);
item.put("text", items[i]);
item.put("right",
R.drawable.icon1);

results.add(item);
}

return results;

}

@Override
public boolean onCreateOptionsMenu(
Menu menu) {
getMenuInflater().inflate(
R.menu.activity_main,
menu);
return true;
}
}

 

 

 

———————————————.ImageAdapter

package com.example.tezt;

import java.util.List;
import java.util.Map;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

public class ImageAdapter extends
BaseAdapter {
private List<Map<String, Object>> datas;

private Context context;

public ImageAdapter(
Context context,
List<Map<String, Object>> datas) {
this.context = context;
this.datas = datas;
}

@Override
public int getCount() {
// TODO Auto-generated method stub
return this.datas.size();
}

@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return this.datas.get(position);
}

@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}

@Override
public View getView(int position,
View convertView,
ViewGroup parent) {
// TODO Auto-generated method stub
ViewHolder holder = null;

if (convertView == null) {
holder = new ViewHolder();
convertView = LayoutInflater
.from(context)
.inflate(
R.layout.list_item,
null);
holder.itemRightImage1 = (ImageView) convertView
.findViewById(R.id.item_right1);
holder.itemText = (TextView) convertView
.findViewById(R.id.item_text);
holder.itemRightImage = (ImageView) convertView
.findViewById(R.id.item_right);

convertView.setTag(holder);
}
else {
holder = (ViewHolder) convertView
.getTag();
}

Map<String, Object> item = this.datas
.get(position);

holder.itemRightImage1
.setImageResource(Integer
.parseInt(item
.get("right1")
.toString()));
holder.itemText
.setText(item.get(
"text")
.toString());
holder.itemRightImage
.setImageResource(Integer
.parseInt(item
.get("right")
.toString()));

return convertView;
}

static class ViewHolder {
ImageView itemRightImage1;
TextView itemText;
ImageView itemRightImage;
}

 

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