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"
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<LinearLayout android:orientation="vertical"
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android:layout_width="fill_parent" android:layout_height="wrap_content"
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xmlns:android="http://schemas.android.com/apk/res/android">
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<RelativeLayout android:gravity="center_vertical"
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android:orientation="horizontal" android:layout_width="fill_parent"
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android:layout_height="32.0dip">
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<TextView android:textSize="16dip" android:gravity="center"
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android:id="@+id/list_live_content_time" android:layout_width="56dip"
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android:layout_height="fill_parent" />
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<TextView android:textSize="16dip" android:ellipsize="marquee"
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android:id="@+id/list_live_content_programm" android:layout_width="260dip"
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android:layout_height="fill_parent" android:singleLine="true"
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android:layout_toRightOf="@id/list_live_content_time" />
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</RelativeLayout>
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</LinearLayout>
man.xml
如下红色字体 一定要加上 android:focusable="true"
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<?xml version="1.0" encoding="utf-8"?>
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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
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android:orientation="vertical" android:layout_width="fill_parent"
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android:layout_height="fill_parent">
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<TextView android:layout_width="fill_parent"
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android:layout_height="wrap_content" android:text="@string/hello" />
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<ListView android:id="@+id/list" android:layout_height="wrap_content"
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android:layout_width="fill_parent" android:focusable="true"
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android:background="@android:color/transparent"></ListView>
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</LinearLayout>
主类代码：ListViewItemActivity。java
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package com.jzh.testitem;
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import java.util.ArrayList;
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import java.util.List;
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import android.app.Activity;
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import android.os.Bundle;
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import android.view.View;
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import android.widget.AdapterView;
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import android.widget.AdapterView.OnItemClickListener;
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import android.widget.ListView;
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public class ListViewItemActivity extends Activity {
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private ListItemAdapter adapter;
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private List<Channel> list;
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private ListView channelList;
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@Override
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public void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.main);
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channelList = (ListView) findViewById(R.id.list);
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list = new ArrayList<Channel>();
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list.add(new Channel(
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"9:12",
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"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。"));
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list.add(new Channel("10:35", "A不喜欢吃鸡蛋，每次发了鸡蛋都给B吃。"));
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list.add(new Channel("12:55",
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"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"));
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list.add(new Channel(
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"14:30",
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"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。"));
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adapter = new ListItemAdapter(this.getApplicationContext(), list);
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channelList.setAdapter(adapter);
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channelList.setOnItemClickListener(new OnItemClickListener() {
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@Override
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public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
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long arg3) {
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adapter.setIndex(arg2);
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adapter.notifyDataSetChanged();
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}
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});
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}
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}
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)；
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package com.jzh.testitem;
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import java.util.List;
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import android.content.Context;
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import android.graphics.Color;
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import android.view.LayoutInflater;
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import android.view.View;
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import android.view.ViewGroup;
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import android.widget.BaseAdapter;
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import android.widget.TextView;
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public class ListItemAdapter extends BaseAdapter {
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private LayoutInflater inflater;
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private List<Channel> items;
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private int index = 0;
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public ListItemAdapter(Context context, List<Channel> items) {
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super();
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this.inflater = LayoutInflater.from(context);
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this.items = items;
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}
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public void setIndex(int selected) {
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index = selected;
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}
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@Override
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public int getCount() {
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return items.size();
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}
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@Override
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public Object getItem(int position) {
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return items.get(position);
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}
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@Override
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public long getItemId(int position) {
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return position;
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}
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@Override
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public View getView(int position, View convertView, ViewGroup parent) {
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ViewHolder holder;
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if (convertView == null) {
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convertView = inflater.inflate(R.layout.live_content_adapter, null);
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holder = new ViewHolder();
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holder.time_tv = (TextView) convertView
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.findViewById(R.id.list_live_content_time);
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holder.content_tv = (TextView) convertView
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.findViewById(R.id.list_live_content_programm);
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} else {
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holder = (ViewHolder) convertView.getTag();
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}
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if (index == position) {
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convertView.setBackgroundColor(Color.GREEN);
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convertView.findViewById(R.id.list_live_content_programm)
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.setSelected(true);
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} else {
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convertView.setBackgroundColor(Color.BLUE);
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convertView.findViewById(R.id.list_live_content_programm)
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.setSelected(false);
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}
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convertView.setTag(holder);
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holder.time_tv.setText(items.get(position).getLiveTime());
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holder.content_tv.setText(items.get(position).getLiveContent());
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return convertView;
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}
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private class ViewHolder {
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private TextView time_tv;
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private TextView content_tv;
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}
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}
实体类代码Channel.java
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package com.jzh.testitem;
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public class Channel {
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private String liveTime;
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private String liveContent;
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public Channel(String liveTime, String liveContent) {
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super();
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this.liveTime = liveTime;
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this.liveContent = liveContent;
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}
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public String getLiveTime() {
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return liveTime;
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}
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public String getLiveContent() {
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return liveContent;
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}
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}
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<TextView android:id="@+id/app_loc"
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android:layout_width="120dip"
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android:layout_height="wrap_content"
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android:textColor="#000000"
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android:textSize="12dp"
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android:layout_marginLeft="10dip"
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android:focusableInTouchMode="true"
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android:ellipsize="marquee"
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android:scrollHorizontally="true"
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android:marqueeRepeatLimit="marquee_forever"></TextView>
可以参考我的一下....然后 如果想不获取焦点就让TextView 的跑马灯效果 直接在自定义adapter中setView方法找到 该TextView 并设置 成
convertView.findViewById(R.id.app_loc)
.setSelected(true);
