ListView 中的TextView实现跑马灯效果

案例：怎么样在一个ListView中含有TextView的item中实现字母滚动呢。这个在一些特定的场合经常用得到。如下图，当焦点位于某个item的时候其内容就自动滚动显示


要实现这样的效果，废话不多说直接上代码：

adapter对应的layout

对应的listView的layout

切记千万不要在TextView中加上android:focusable="true"

[java] view
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<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

如下红色字体 一定要加上 android:focusable="true"

[html] view
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<!--如下红色字体 一定要加上 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>

主类代码：ListViewItemActivity。java

[java] view
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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",

"那些流逝的时光我想和电影里一样对你说--我爱你，我爱你，我爱你..光影世界的我爱你。一次一次，我不厌其烦地切回那个镜头，找到你最深情的一刻，复制这句不能再普通不能再庸俗的话语。而你，屡屡感动我在冰冷的屏幕前。"));

list.add(new Channel("10:35", "A不喜欢吃鸡蛋，每次发了鸡蛋都给B吃。"));

list.add(new Channel("12:55",

"A不喜欢吃鸡蛋，每次发了鸡蛋都给B吃。刚开始B很感谢，久而久之便习惯了。习惯了，便理所当然了"));

list.add(new Channel(

"14:30",

"于是，直到有一天，A将鸡蛋给了C，B就不爽了。她忘记了这个鸡蛋本来就是A的，A想给谁都可以。为此，她们大吵一架，从此绝交。其实，不是别人不好了，而是我们的要求变多了。习惯了得到，便忘记了感恩。"));

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类代码： ListItemAdapter.java

注意下面加注释的两行代码一定要设置你的textView的setSelected(true)；

[java] view
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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);

//此处就是设置textview为选中状态，方可以实现效果

convertView.findViewById(R.id.list_live_content_programm)

.setSelected(true);

} else {

convertView.setBackgroundColor(Color.BLUE);

//没选中的就不用设置了

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;

}

}

实体类代码Channel.java

[java] view
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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;

}

}