ListView 中的TextView实现跑马灯效果

转载：http://blog.csdn.net/sky181772733/article/details/7003125#

 

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"

<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"

<!--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

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)；

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

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;
    }

}