我的活动提供了listview首歌曲。单击某个项目时，它会流式传输相应的媒体文件。我在每一行都有一个显示轨道长度的文本视图。在播放曲目时，我将行中backgroundresource的{{1}}切换为可绘制的暂停按钮。换句话说，当它准备播放时，它会显示一个播放按钮，当它正在播放时会显示一个暂停按钮。很简单......
目前，如果textview正在播放，我正在做类似这样的事情来将drawable设置为暂停按钮：
mediaplayer
我在我的Runnable中执行此操作，其if(mp.isPlaying()) {
_player.setBackgroundResource(R.drawable.pausebtn);
_player.setText(" :" + String.valueOf(mp.getDuration()/1000));回调为mediaplayer。
问题是我需要在该列表项中设置drawable，即点击的那个和正在播放其轨道的那个。如何抓住单击哪一个并将ITS textview设置为新的drawable？
这是完整的代码：
onPrepared正如您所看到的，扩展package com.me.player
import java.net.URL;
import java.util.ArrayList;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import android.content.Context;
import android.graphics.Color;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.media.MediaPlayer.OnErrorListener;
import android.media.MediaPlayer.OnPreparedListener;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.AdapterView.OnItemClickListener;
import com.mtv.datahandler.Artist;
import com.mtv.datahandler.DataBaseHelper;
import com.mtv.datahandler.Track;
import com.mycompany.http.HttpRequest;
public class ArtistAudio extends ControllerActivity implements OnCompletionListener, OnPreparedListener, OnErrorListener{
private int METHOD_TYPE = 0;
private static final int GET_AUDIO = 1;
int CURRENT_POSITION = 0;
int DURATION = 0;
public static final String AUDIO_FEED_URL = "http://direct.rhapsody.com/metadata/data/getTopTracksForArtist.xml?blabla";
public static final int MAX_TRACKS = 200;
ArrayList<Track> tracks = new ArrayList<Track>();
Artist artist;
private MediaPlayer mp;
private int mSongPlaying = 0;
TextView _player;
@Override
protected void progressRunnableComplete() {
if(isFinishing()){
return;
}
if(METHOD_TYPE == GET_AUDIO){
setList();
}
}
public void setList(){
ListView listview = (ListView)findViewById(R.id.ListView01);
// ListView listview = (ListView)findViewById(R.id.ListView01);
if(listview == null){
setContent(R.layout.artistaudio);
listview = (ListView)findViewById(R.id.ListView01);
}
// listview.addHeaderView();
listview.setCacheColorHint(0);
listview.setAdapter(new TrackListAdapter());
listview.setSelector(R.drawable.listbackground);
listview.setDividerHeight(1);
listview.setDivider(getResources().getDrawable(R.drawable.img_dotted_line_horz));
listview.setOnItemClickListener(new OnItemClickListener(){
@Override
public void onItemClick(AdapterView<?> arg0, View arg1,
int arg2, long arg3) {
// TODO Auto-generated method stub
TrackClicked(arg2);
}
});
}
public void TrackClicked(int arg2){
mSongPlaying = arg2;
Track track = tracks.get(arg2);
String url = track.requestInfo("previewURL");
mHandler.post(new PlaySong(url));
// mHandler.post(new PlaySong("http://dc237.4shared.com/img/315443275/33f14ef2/dlink__2Fdownload_2F9y5VGjVt_3Ftsid_3D20100705-131850-40aa0b87/preview.mp3"));
}
public void setDuration(int n) {
DURATION = n;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setTitle("Audio Clips");
setContent(R.layout.artistaudio);
Object o = getIntent().getParcelableExtra("artist");
if(o!=null){
artist = (Artist)o;
}
progressRunnable(new Runnable(){
public void run(){
getTracks();
}
}, "Loading. Please Wait...",false);
}
protected void getTracks() {
METHOD_TYPE = GET_AUDIO;
if(!DataBaseHelper.isOnline(this)){
RUNNABLE_STATE = RUNNABLE_FAILED;
return;
}
HttpRequest req;
try {
req = new HttpRequest(new URL(AUDIO_FEED_URL+artist.requestInfo("rhapsodyID")));
Document doc = req.AutoXMLNoWrite();
NodeList items = doc.getElementsByTagName("e");
tracks= new ArrayList<Track>();
for(int i=0; i<items.getLength(); i++){
Track newsitem = new Track(items.item(i));
tracks.add(newsitem);
}
RUNNABLE_STATE = RUNNABLE_SUCCESS;
} catch (Throwable e) {
RUNNABLE_STATE = RUNNABLE_FAILED;
e.printStackTrace();
}
}
public void onPause(){
super.onPause();
try{mp.stop();}catch(Exception e){e.printStackTrace();}
try{mp.reset();}catch(Exception e){e.printStackTrace();}
try{mp.release();}catch(Exception e){e.printStackTrace();}
mp = null;
}
private class TrackListAdapter extends BaseAdapter{
@Override
public int getCount() {
// TODO Auto-generated method stub
return tracks.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return tracks.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) {
// TODO Auto-generated method stub
AudioCell blogView = null;
if (convertView != null) {
if(convertView.getClass() == TextView.class){
convertView = null;
}
}
if (convertView == null) {
blogView = new AudioCell(parent.getContext());
}
else {
blogView = (AudioCell) convertView;
}
blogView.display(position);
return blogView;
}
}
/** this class is responsible for rendering the data in the model, given the selection state */
class AudioCell extends RelativeLayout {
TextView _title;
int currentPosition;
public AudioCell(Context mContext) {
super(mContext);
_createUI(mContext);
}
/** create the ui components */
private void _createUI(Context m) {
RelativeLayout.LayoutParams params;
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
params = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
_player = new TextView(m);
_player.setId(2);
_player.setBackgroundResource(R.drawable.playbtn);
_player.setText(":30");
addView(_player);
params.addRule(RelativeLayout.CENTER_VERTICAL,1);
_player.setLayoutParams(params);
_title = new TextView(m);
_title.setTextColor(Color.BLACK);
params = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT,(int)(44*metrics.density));
params.addRule(RelativeLayout.CENTER_VERTICAL,1);
params.addRule(RelativeLayout.RIGHT_OF, _player.getId());
params.setMargins(0, 10, 0, 10);
_title.setGravity(Gravity.CENTER_VERTICAL);
_title.setLayoutParams(params);
_title.setId(102);
addView(_title);
params = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT,(int)(44*metrics.density));
// _player.setOnClickListener(new View.OnClickListener() {
//
// @Override
// public void onClick(View v) {
// PlaySong.PlaySong("http://http://www.noiseaddicts.com/samples/2544.mp3");
//
// }
// });
//
}
/** update the views with the data corresponding to selection index */
public void display(int index) {
_title.setText(tracks.get(index).requestInfo("name"));
}
}
private class PlaySong implements Runnable{
String songURL;
public PlaySong(String url){
songURL = url;
}
public void run(){
try{mp.stop();}catch(Exception e){e.printStackTrace();}
try{mp.reset();}catch(Exception e){e.printStackTrace();}
if(mp==null){
createPlayer();
}
try{mp.reset();}catch(Exception e){e.printStackTrace();}
try{mp.setAudioStreamType(AudioManager.STREAM_MUSIC);}catch(Exception e){e.printStackTrace();}
try{mp.setDataSource(songURL);}catch(Exception e){e.printStackTrace();}
try{mp.prepareAsync();}catch(Exception e){e.printStackTrace();}
}
}
public void createPlayer(){
mp = new MediaPlayer();
mp.setOnCompletionListener(this);
mp.setOnPreparedListener(this);
mp.setOnErrorListener(this);
mp.setAudioStreamType(AudioManager.STREAM_MUSIC);
}
@Override
public void onCompletion(MediaPlayer mp) {
// TODO Auto-generated method stub
try{mp.reset();}catch(Exception e){e.printStackTrace();}
// if(mSongPlaying<tracks.size()-1)
// {
// TrackClicked(mSongPlaying+1);
// }
_player.setBackgroundResource(R.drawable.playbtn);
}
@Override
public void onPrepared(MediaPlayer inMP) {
// TODO Auto-generated method stub
mp.start();
if(mp.isPlaying()) {
_player.setBackgroundResource(R.drawable.pausebtn);
_player.setText(" :" + String.valueOf(mp.getDuration()/1000));
}
}
@Override
public boolean onError(MediaPlayer mp, int what, int extra) {
// TODO Auto-generated method stub
return false;
}
}
的内部课程AudioCell就是我用于RelativeLayout的行......
有什么想法？我应该在哪里设置drawable，我怎样才能确保它只针对被点击的行（即实际播放的曲目）。
答案 0 :(得分：1)
更改TrackClicked方法的siggnature。从arg1传递arg3和onItemClick，在TrackClicked方法中传递arg1.setBackgroundResource(R.drawable.thebackground);
答案 1 :(得分：0)
在TrackClicked方法中，添加以下内容：
getAdapter().getChildAt(arg2).setBackgroundResource(R.drawable.thebackground);