Java 滚动列表视图项后,视图元素与
我在android项目中有一个简单的ԼistView。 1.歌曲类型 2.文件夹类型 ListView项模型“SongModel”,有类型字段 歌曲模型Java 滚动列表视图项后,视图元素与,java,android,Java,Android,我在android项目中有一个简单的ԼistView。 1.歌曲类型 2.文件夹类型 ListView项模型“SongModel”,有类型字段 歌曲模型 public class SongModel { public String title; public int type; public String getTitle() { return title; } public void setTitle(String title) { this.title = title;
public class SongModel {
public String title;
public int type;
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public int getType() {
return type;
}
public void setType(int type) {
this.type = type;
}
}
在ListView项目视图中,我有3个元素:歌曲名称的TextView、歌曲或文件夹照片的ImageView和歌曲播放的ImageButton
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal" >
<ImageView
android:id="@+id/song_photo"
android:layout_width="119dp"
android:layout_height="match_parent"
android:src="@drawable/ic_launcher" />
<TextView
android:id="@+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView" />
</LinearLayout>
<ImageButton
android:id="@+id/add_queue"
android:layout_width="wrap_content"
android:layout_height="542dp"
android:src="@drawable/ic_launcher" />
在适配器类中,我检查,如果items View中的TYPE=1 I绘制歌曲照片。如果TYPE=2 I绘制文件夹照片,我检查ImageButton可见性set View.GONE
package com.example.adapter;
import java.util.ArrayList;
import android.app.Activity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.TextView;
public class SongAdapter extends ArrayAdapter<SongModel> {
private ArrayList<SongModel> entries;
private Activity activity;
static class ViewHolder {
public ImageButton song_play;
public TextView song_name;
public ImageView song_photo;
}
public SongAdapter(Activity a, int textViewResourceId,ArrayList<SongModel> entries) {
super(a, textViewResourceId, entries);
this.entries = entries;
this.activity = a;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View rowView = convertView;
if (rowView == null) {
LayoutInflater inflater = activity.getLayoutInflater();
rowView = inflater.inflate(R.layout.list_item, null);
ViewHolder viewHolder = new ViewHolder();
viewHolder.song_name = (TextView) rowView.findViewById(R.id.title);
viewHolder.song_photo = (TextView) rowView.findViewById(R.id.song_photo);
viewHolder.song_play = (ImageView) rowView .findViewById(R.id.song_play);
rowView.setTag(viewHolder);
}
ViewHolder holder = (ViewHolder) rowView.getTag();
SongModel song = entries.get(position);
holder.song_name.setText(song. getTitle());
if (song.getType()==2)
{
holder.song_play.setVisibility(View.Gone);
holder.song_photo.setImageResource(R.drawable.folder);
}
else
{
holder.song_photo.setImageResource(R.drawable.song);
}
rowView.setTag(getItemViewType(position));
return rowView;
}
}
package com.example.adapter;
导入java.util.ArrayList;
导入android.app.Activity;
导入android.view.LayoutInflater;
导入android.view.view;
导入android.view.view.OnClickListener;
导入android.view.ViewGroup;
导入android.widget.ArrayAdapter;
导入android.widget.ImageButton;
导入android.widget.ImageView;
导入android.widget.TextView;
公共类SongAdapter扩展了ArrayAdapter{
私有ArrayList条目;
私人活动;
静态类视窗夹{
公共图像按钮宋_播放;
公共文本视图song_名称;
公共图像查看宋ê照片;
}
公共SongAdapter(活动a、int-textViewResourceId、ArrayList条目){
super(a,textViewResourceId,条目);
this.entries=条目;
本活动=a;
}
@凌驾
公共视图getView(int位置、视图转换视图、视图组父视图){
视图行视图=转换视图;
if(rowView==null){
LayoutInflater充气器=活动。getLayoutInflater();
rowView=充气机。充气(R.layout.list_项,空);
ViewHolder ViewHolder=新ViewHolder();
viewHolder.song_name=(TextView)rowView.findViewById(R.id.title);
viewHolder.song_photo=(TextView)rowView.findViewById(R.id.song_photo);
viewHolder.song\u play=(ImageView)rowView.findviewbyd(R.id.song\u play);
rowView.setTag(viewHolder);
}
ViewHolder=(ViewHolder)rowView.getTag();
SongModel宋=条目.get(位置);
holder.song_name.setText(song.getTitle());
if(song.getType()==2)
{
holder.song_play.setVisibility(视图已消失);
holder.song_photo.setImageResource(R.drawable.folder);
}
其他的
{
持有者.song_photo.setImageResource(R.drawable.song);
}
setTag(getItemViewType(position));
返回行视图;
}
}
在活动代码中
package com.example.adapter;
import java.util.ArrayList;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.widget.ListView;
public class MainActivity extends Activity {
private ArrayList<SongModel> fetch;
private ListView MusicItemlistView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
MusicItemlistView=(ListView)findViewById(R.id.listview);
fetch = new ArrayList<SongModel>();
try {
JSONObject jsonData=new JSONObject(datajson);
JSONArray dataArray=jsonData.getJSONArray("responseBody");
SongModel sg;
JSONObject js;
for(int i=0;i<dataArray.length();i++)
{
sg=new SongModel();
js=(JSONObject) dataArray.get(i);
sg.setAlbum(js.getString("artist"));
sg.setFileName(js.getString("fileName"));
sg.setType(Integer.parseInt(js.getString("type")));
sg.setDuration(Integer.parseInt(js.getString("duration")));
fetch.add(sg);
}
MyPerformanceArrayAdapter adapter = new MyPerformanceArrayAdapter (this,R.id.listview, fetch);
MusicItemlistView.setAdapter(adapter);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
package com.example.adapter;
导入java.util.ArrayList;
导入org.json.JSONArray;
导入org.json.JSONException;
导入org.json.JSONObject;
导入android.os.Bundle;
导入android.app.Activity;
导入android.view.Menu;
导入android.widget.ListView;
公共类MainActivity扩展了活动{
私有数组列表获取;
私有列表视图MusicItemlistView;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
MusicItemlistView=(ListView)findViewById(R.id.ListView);
fetch=newarraylist();
试一试{
JSONObject jsonData=新的JSONObject(datajson);
JSONArray dataArray=jsonData.getJSONArray(“responseBody”);
SongModel sg;
JSONObject js;
对于(int i=0;i确保将song_play
的可见性设置为View.Visible
,当song type不是2时。单元格将被重用,并且某些重用视图的song_play元素不可见
if (song.getType()==2)
{
holder.song_play.setVisibility(View.Gone);
holder.song_photo.setImageResource(R.drawable.folder);
}
else
{
holder.song_play.setVisibility(View.Visible); //Add this here.
holder.song_photo.setImageResource(R.drawable.song);
}
试试这个:
if (song.getType()==2)
{
holder.song_play.setVisibility(View.Gone);
holder.song_photo.setImageResource(R.drawable.folder);
}
else
{
holder.song_play.setVisibility(View.VISISBLE);
holder.song_photo.setImageResource(R.drawable.song);
}
但是这些情况下,song_play photo始终是可见的。我在前面的其他单元格中使用了View.go
。现在将其更正为View.Visible。您必须明确设置每个单元格中元素的可见性或不可见性。在您的情况下,单元格被重用,song_play元素的可见性在其他单元格中受到控制。vie的重用这里介绍了列表视图中的ws
,非常感谢您的链接