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第一步，导入水果列表的代码。然后打开Fruit.java,添加变量：private String text;和private String time;分别的评论部分和显示时间的部分。添加Source-Generate Constructor using Fields,确定；再添加Getter、Setter方法。

第二步，这个时候系统会报错，打开MainActivity.java，修改initFruits()这个方法，Fruit apple = new Fruit("潇湘夜雨", R.drawable.p1,"今天好高兴啊！","1分钟前");下边的也类&#;。

第三步，打开FruitAdapter.java，修改 getView这个方法。添加TextView textView=(TextView)view.findViewById(R.id.textView);TextView textView2=(TextView)view.findViewById(R.id.textView2);再添加textView.setText(fruit.getText());textView2.setText(fruit.getTime());

第四步，自定义标题栏。

1.在res/value下建立mytitlebar.xml文件

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

<resources xmlns:android=" <style name="myTitleBg">

<item name="android:background">#FF</item>

</style>

<style name="myTheme" parent="android:Theme">

<item name="android:windowNoTitle">false</item>

<item name="android:windowTitleSize">dp</item>

<item name="android:windowTitleBackgroundStyle">@style/myTitleBg</item>

</style>

</resources>

2.修改AndroidManifest.xml文件

android:theme="@style/myTheme"

下边是代码：

MainActivity.java

[java] view plaincopyprint?package com.example.ui_listview; import java.util.ArrayList; import java.util.List; import android.app.Activity; import android.os.Bundle; import android.view.Menu; import android.view.View; import android.widget.AdapterView; import android.widget.Toast; import android.widget.AdapterView.OnItemClickListener; import android.widget.ListView; import com.example.ui_listview.adpater.FruitAdapter; import com.example.ui_listview.model.Fruit; public class MainActivity extends Activity { private ListView lvFruits; //1.准备好数据源 private List<Fruit> fruitList = new ArrayList<Fruit>(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //1.准备好数据源 initFruits(); lvFruits = (ListView) findViewById(R.id.lvFruits); //2.创建Adapter FruitAdapter adapter=new FruitAdapter(this, R.layout.fruit_item,fruitList); //3.绑定AdapterView和Adapter之间的关联 lvFruits.setAdapter(adapter); lvFruits.setOnItemClickListener(new OnItemClickListener() { public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) { Fruit fruit=fruitList.get(position); Toast.makeText(MainActivity.this, fruit.getName(), Toast.LENGTH_SHORT).show(); } }); } private void initFruits() { Fruit apple = new Fruit("潇湘夜雨", R.drawable.p1,"今天好高兴啊！","1分钟前"); fruitList.add(apple); Fruit banana = new Fruit("小小", R.drawable.p2,"今天吃了好多啊！","2分钟前"); fruitList.add(banana); Fruit orange = new Fruit("青春无悔", R.drawable.p3,"你今天多的怎么样啊？","3分钟前"); fruitList.add(orange); Fruit watermelon = new Fruit("小丸子", R.drawable.p4,"最近如何呀？","1小时前"); fruitList.add(watermelon); Fruit pear = new Fruit("米粒", R.drawable.p5,"过年好啊！","1.5小时前"); fruitList.add(pear); Fruit grape = new Fruit("丽丽", R.drawable.p6,"我今天中午在学校吃了好多呀！","2小时前"); fruitList.add(grape); Fruit pineapple = new Fruit(" 嘻嘻", R.drawable.p7,"你最近过的咋样啊！","6小时前"); fruitList.add(pineapple); Fruit strawberry = new Fruit("晕晕", R.drawable.p8,"我今晚上吃啥呀","1天前"); fruitList.add(strawberry); Fruit cherry = new Fruit("哈哈", R.drawable.p,"再见了，各位朋友~","1周前"); fruitList.add(cherry); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } }

FruitAdapter.java

[java] view plaincopyprint?package com.example.ui_listview.adpater; import java.util.List; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ArrayAdapter; import android.widget.BaseAdapter; import android.widget.ImageView; import android.widget.TextView; import com.example.ui_listview.R; import com.example.ui_listview.model.Fruit; //存在问题：在FruitAdapter的getView()方法中每次都将布局重新加载了一遍，当ListView快速滚动的时候这就会成为性能的瓶颈 public class FruitAdapter extends ArrayAdapter<Fruit> { private int resourceId; public FruitAdapter(Context context, int textViewResourceId, List<Fruit> data) { super(context, textViewResourceId, data); resourceId=textViewResourceId; } // 这个方法在每个子项被滚动到屏幕内的时候会被调用 @Override public View getView(int position, View convertView, ViewGroup parent) { Fruit fruit = getItem(position); View view=LayoutInflater.from(getContext()).inflate(resourceId, null); ImageView ivFruit=(ImageView) view.findViewById(R.id.ivFruit); TextView tvFruit=(TextView) view.findViewById(R.id.tvFruit); TextView textView=(TextView)view.findViewById(R.id.textView); TextView textView2=(TextView)view.findViewById(R.id.textView2); ivFruit.setImageResource(fruit.getImageId()); tvFruit.setText(fruit.getName()); textView.setText(fruit.getText()); textView2.setText(fruit.getTime()); return view; } }

FruitAdapterImprove1.java

[java] view plaincopyprint?package com.example.ui_listview.adpater; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ArrayAdapter; import android.widget.ImageView; import android.widget.TextView; import com.example.ui_listview.R; import com.example.ui_listview.model.Fruit; //存在问题：虽然现在已经不会再重复去加载布局，但是每次在getView()方法中还是会调用View的findViewById()方法来获取一次控件的实例。 public class FruitAdapterImprove1 extends ArrayAdapter { private int resourceId; public FruitAdapterImprove1(Context context, int textViewResourceId) { super(context, textViewResourceId); resourceId = textViewResourceId; } // 这个方法在每个子项被滚动到屏幕内的时候会被调用 //getView()方法中还有一个convertView参数，这个参数用于将之前加载好的布局进行缓存，以便之后可以进行重用 @Override public View getView(int position, View convertView, ViewGroup parent) { Fruit fruit = (Fruit) getItem(position); View view=null; if(convertView==null) view = LayoutInflater.from(getContext()).inflate(resourceId, null); else view=convertView; ImageView fruitImage = (ImageView) view.findViewById(R.id.ivFruit); TextView fruitName = (TextView) view.findViewById(R.id.tvFruit); fruitImage.setImageResource(fruit.getImageId()); fruitName.setText(fruit.getName()); return view; } }

FruitAdapterImprove2.doc

[java] view plaincopyprint?package com.example.ui_listview.adpater; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ArrayAdapter; import android.widget.ImageView; import android.widget.TextView; import com.example.ui_listview.R; import com.example.ui_listview.model.Fruit; //我们新增了一个内部类ViewHolder，用于对控件的实例进行缓存。 //当convertView为空的时候，创建一个ViewHolder对象，并将控件的实例都存放在ViewHolder里，然后调用View的setTag()方法，将ViewHolder对象存储在View中。 //当convertView不为空的时候则调用View的getTag()方法，把ViewHolder重新取出。 //这样所有控件的实例都缓存在了ViewHolder里，就没有必要每次都通过findViewById()方法来获取控件实例了。 public class FruitAdapterImprove2 extends ArrayAdapter { private int resourceId; public FruitAdapterImprove2(Context context, int textViewResourceId) { super(context, textViewResourceId); resourceId = textViewResourceId; } // 这个方法在每个子项被滚动到屏幕内的时候会被调用 // getView()方法中还有一个convertView参数，这个参数用于将之前加载好的布局进行缓存，以便之后可以进行重用 @Override public View getView(int position, View convertView, ViewGroup parent) { Fruit fruit = (Fruit) getItem(position); View view = null; ViewHolder viewHolder; if (convertView == null) { view = LayoutInflater.from(getContext()).inflate(resourceId, null); viewHolder = new ViewHolder(); viewHolder.ivFruit = (ImageView) view.findViewById(R.id.ivFruit); viewHolder.tvFruit = (TextView) view.findViewById(R.id.tvFruit); view.setTag(viewHolder); } else { view = convertView; viewHolder = (ViewHolder) convertView.getTag(); } viewHolder.ivFruit.setImageResource(fruit.getImageId()); viewHolder.tvFruit.setText(fruit.getName()); return view; } class ViewHolder { ImageView ivFruit; TextView tvFruit; } }

Fruit.java

[java] view plaincopyprint?package com.example.ui_listview.model; public class Fruit { private String name; private int imageId; private String text; private String time; public Fruit(String name, int imageId, String text, String time) { super(); this.name = name; this.imageId = imageId; this.text = text; this.time = time; } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getImageId() { return imageId; } public void setImageId(int imageId) { this.imageId = imageId; } public String getText() { return text; } public void setText(String text) { this.text = text; } public String getTime() { return time; } public void setTime(String time) { this.time = time; } }

fruit_item.xml

[html] view plaincopyprint?<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android=" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal" > <ImageView android:id="@&#;id/ivFruit" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/p1" /> <TextView android:id="@&#;id/tvFruit" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_margin="dp" android:layout_marginLeft="dp" android:layout_toRightOf="@&#;id/ivFruit" android:text="Apple" /> <TextView android:id="@&#;id/textView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@&#;id/tvFruit" android:layout_below="@&#;id/tvFruit" android:layout_marginLeft="dp" android:text="今天真高兴" /> <TextView android:id="@&#;id/textView2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBaseline="@&#;id/tvFruit" android:layout_alignBottom="@&#;id/tvFruit" android:layout_alignParentRight="true" android:layout_marginRight="dp" android:text="TextView" /> </RelativeLayout>

activity_main.xml

[html] view plaincopyprint?<LinearLayout xmlns:android=" xmlns:tools=" android:id="@&#;id/LinearLayout1" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context=".MainActivity" > <ListView android:id="@&#;id/lvFruits" android:layout_width="match_parent" android:layout_height="wrap_content" > </ListView> </LinearLayout>

AndroidManifest.xml

[html] view plaincopyprint?<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android=" package="com.example.ui_listview" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="" /> <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/myTheme" > <activity android:name="com.example.ui_listview.MainActivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>

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