ListView 中的TextView實現跑馬燈效果

案例：怎麼樣在一個ListView中含有TextView的item中實現字母滾動呢。這個在一些特定的場合常常用獲得。以下圖，當焦點位於某個item的時候其內容就自動滾動顯示

要實現這樣的效果，廢話很少說直接上代碼：

adapter對應的layout

對應的listView的layout

切記千萬不要在TextView中加上android:focusable="true"

 <LinearLayout android:orientation="vertical"
     android:layout_width="fill_parent" android:layout_height="wrap_content"
     xmlns:android="http://schemas.android.com/apk/res/android">
     <RelativeLayout android:gravity="center_vertical"
         android:orientation="horizontal" android:layout_width="fill_parent"
         android:layout_height="32.0dip">
         <TextView android:textSize="16dip" android:gravity="center"
             android:id="@+id/list_live_content_time" android:layout_width="56dip"
             android:layout_height="fill_parent" />
         <TextView android:textSize="16dip" android:ellipsize="marquee"
             android:id="@+id/list_live_content_programm" android:layout_width="260dip"
             android:layout_height="fill_parent" android:singleLine="true"
             android:layout_toRightOf="@id/list_live_content_time" />
     </RelativeLayout>
 </LinearLayout>

 

man.xml

以下紅色字體 必定要加上 android:focusable="true"

 <!--以下紅色字體 必定要加上 android:focusable="true" -->

  <?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="fill_parent">
     <TextView android:layout_width="fill_parent"
         android:layout_height="wrap_content" android:text="@string/hello" />
     <ListView android:id="@+id/list" android:layout_height="wrap_content"
         android:layout_width="fill_parent"   android:focusable="true"
         android:background="@android:color/transparent"></ListView>
 </LinearLayout>

主類代碼：ListViewItemActivity。java

 package com.jzh.testitem;

 import java.util.ArrayList;
 import java.util.List;

 import android.app.Activity;
 import android.os.Bundle;
 import android.view.View;
 import android.widget.AdapterView;
 import android.widget.AdapterView.OnItemClickListener;
 import android.widget.ListView;

 public class ListViewItemActivity extends Activity {
     /** Called when the activity is first created. */
     private ListItemAdapter adapter;
     private List<Channel> list;
     private ListView channelList;

     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.main);
         channelList = (ListView) findViewById(R.id.list);
         list = new ArrayList<Channel>();
         list.add(new Channel(
                 "9:12",
                 "那些流逝的時光我想和電影裏同樣對你說--我愛你，我愛你，我愛你..光影世界的我愛你。一次一次，我不厭其煩地切回那個鏡頭，找到你最深情的一刻，複製這句不能再普通不能再庸俗的話語。而你，屢屢感動我在冰冷的屏幕前。"));
         list.add(new Channel("10:35", "A不喜歡吃雞蛋，每次發了雞蛋都給B吃。"));
         list.add(new Channel("12:55",
                 "A不喜歡吃雞蛋，每次發了雞蛋都給B吃。剛開始B很感謝，長此以往便習慣了。習慣了，便理所固然了"));
         list.add(new Channel(
                 "14:30",
                 "因而，直到有一天，A將雞蛋給了C，B就不爽了。她忘記了這個雞蛋原本就是A的，A想給誰均可以。爲此，她們大吵一架，今後絕交。其實，不是別人很差了，而是咱們的要求變多了。習慣了獲得，便忘記了感恩。"));
         adapter = new ListItemAdapter(this.getApplicationContext(), list);
         channelList.setAdapter(adapter);
         channelList.setOnItemClickListener(new OnItemClickListener() {

             @Override
             public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
                     long arg3) {
                 adapter.setIndex(arg2);
                 adapter.notifyDataSetChanged();

             }
         });
     }
 }

adapter類代碼： ListItemAdapter.java

注意下面加註釋的兩行代碼必定要設置你的textView的setSelected(true)；

 package com.jzh.testitem;

 import java.util.List;

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

 public class ListItemAdapter extends BaseAdapter {
     private LayoutInflater inflater;
     private List<Channel> items;
     private int index = 0;

     public ListItemAdapter(Context context, List<Channel> items) {
         super();
         this.inflater = LayoutInflater.from(context);
         this.items = items;
     }

     public void setIndex(int selected) {
         index = selected;
     }

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

     @Override
     public Object getItem(int position) {
         // TODO Auto-generated method stub
         return items.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) {
         ViewHolder holder;
         if (convertView == null) {
             convertView = inflater.inflate(R.layout.live_content_adapter, null);
             holder = new ViewHolder();
             holder.time_tv = (TextView) convertView
                     .findViewById(R.id.list_live_content_time);
             holder.content_tv = (TextView) convertView
                     .findViewById(R.id.list_live_content_programm);
         } else {
             holder = (ViewHolder) convertView.getTag();
         }
         if (index == position) {

             convertView.setBackgroundColor(Color.GREEN);
                              //此處就是設置textview爲選中狀態，方能夠實現效果
              convertView.findViewById(R.id.list_live_content_programm)
              .setSelected(true);

         } else {
             convertView.setBackgroundColor(Color.BLUE);
             //沒選中的就不用設置了
                         convertView.findViewById(R.id.list_live_content_programm)
              .setSelected(false);
         }
         convertView.setTag(holder);
         holder.time_tv.setText(items.get(position).getLiveTime());
         holder.content_tv.setText(items.get(position).getLiveContent());
         return convertView;
     }

     private class ViewHolder {
         private TextView time_tv;
         private TextView content_tv;
     }
 }

實體類代碼Channel.java

 package com.jzh.testitem;

 public class Channel {
     private String liveTime;
     private String liveContent;

     public Channel(String liveTime, String liveContent) {
         super();
         this.liveTime = liveTime;
         this.liveContent = liveContent;
     }

     public String getLiveTime() {
         return liveTime;
     }

     public String getLiveContent() {
         return liveContent;
     }

 }