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]
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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]
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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]
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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]
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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]
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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;
}

}

转载于：/article/9596197.html