应用程序崩溃onPlaying音频列表视图第二次适配器 [英] App crashes onPlaying audio in Adapter of listview second time
问题描述
我的类由列表视图，其中包含的曲目列表。每个列表项由按钮播放和Pause.It应该在点击播放播放曲目和停止赛道上点击pause.i我不使用不同的按钮....我是只用一个按钮，它改变它在点击b文/ W播放，并相应地暂停和功能。 我现在面临以下issues- 点击播放不播放的曲目，但是当我停在轨道点击暂停，然后尝试播放任何曲目应用程序崩溃，并显示以下错误显示非法状态异常
My class consists of listview which contains list of tracks .Each list item consists of button Play and Pause.It should play track on clicking play and stop track on clicking pause.i am not using different buttons....i am using one button only which changes its text on clicking b/w play and pause and function accordingly. I am facing following issues- Clicking on play does play the track but when i stop the track by clicking pause and then try to play any track app crashes and shows following errors showing illegalstate exception
致命异常：主要
java.lang.IllegalStateException
at android.media.MediaPlayer._setDataSource(Native Method)
at android.media.MediaPlayer.setDataSource(MediaPlayer.java:966)
at android.media.MediaPlayer.setDataSource(MediaPlayer.java:926)
at xyz.SoundCloudAdapter$1.onClick(SoundCloudAdapter.java:86)
at android.view.View.performClick(View.java:4091)
at android.view.View$PerformClick.run(View.java:17072)
at android.os.Handler.handleCallback(Handler.java:615)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:153)
at android.app.ActivityThread.main(ActivityThread.java:5086)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:821)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:584)
at dalvik.system.NativeStart.main(Native Method)
SoundClassAdapter 公共类SoundCloudAdapter扩展ArrayAdapter实现MediaPlayer.On preparedListener { ArrayList的soundcloudList; LayoutInflater六; INT资源;
SoundClassAdapter public class SoundCloudAdapter extends ArrayAdapter implements MediaPlayer.OnPreparedListener{ ArrayList soundcloudList; LayoutInflater vi; int Resource;
public static MediaPlayer mMediaPlayer;
public SoundCloudAdapter(Context context, int resource, ArrayList<SoundCloud> objects)
{
super(context, resource, objects);
vi = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
Resource = resource;
soundcloudList = objects;
mMediaPlayer = new MediaPlayer();
mMediaPlayer.setOnPreparedListener(this);
}
@Override
public View getView(final int position, View convertView, ViewGroup parent)
{
final ViewHolder holder;
// convert view = design
View v = convertView;
if (v == null)
{
holder = new ViewHolder();
v = vi.inflate(Resource, null);
holder.textview = (TextView) v.findViewById(R.id.name);
holder.btn = (Button) v.findViewById(R.id.button);
holder.btn2 = (Button) v.findViewById(R.id.button2);
holder.textview2 = (TextView) v.findViewById(R.id.email);
v.setTag(holder);
}
else
{
holder = (ViewHolder) v.getTag();
}
holder.textview.setText(soundcloudList.get(position).getTitle());
holder.textview2.setText(soundcloudList.get(position).getId());
holder.btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
notifyDataSetChanged();
if (holder.btn.getText().toString().equalsIgnoreCase("Play"))
{
holder.btn.setText("Pause");
mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
try
{
mMediaPlayer.setDataSource("http://api.soundcloud.com/tracks/"+soundcloudList.get(position).getId()+"/stream?client_id=xyz");
mMediaPlayer.prepareAsync();
}
catch (IllegalArgumentException e)
{
e.printStackTrace();
}
catch (IOException e)
{
e.printStackTrace();
}
notifyDataSetChanged();
}
else if (holder.btn.getText().toString().equalsIgnoreCase("Pause"))
{
holder.btn.setText("Play");
if(mMediaPlayer.isPlaying()) {
mMediaPlayer.stop();
}
mMediaPlayer.release();
notifyDataSetChanged();
}
}
});
return v;
}
@Override
public void onPrepared(MediaPlayer mp) {
mp.start();
}
static class ViewHolder
{
public TextView textview;
public Button btn;
public Button btn2;
public TextView textview2;
}
}
如果我宣布
mMediaPlayer = new MediaPlayer();
mMediaPlayer.setOnPreparedListener(this); inside onClick()
轨迹不暂停
推荐答案
尝试处理每个列表项的MediaPlayer的状态时，它播放和暂停，也没有必要声明viewHolder对象作为最终可能影响的列表项的状态。
Try handle MediaPlayer state of each list item whenever it play and pause and also no need declare viewHolder object as final which may effect list item state.
public class SoundCloudAdapter extends BaseAdapter{
private MediaPlayer mMediaPlayer;
private Context context;
private ArrayList<SoundCloud> soundcloudList;
public SoundCloudAdapter(Context context, ArrayList<SoundCloud> soundcloudList){
this.context=context;
this.soundcloudList = soundcloudList;
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public int getCount() {
return soundcloudList.size();
}
@Override
public Object getItem(int position) {
return soundcloudList.get(position);
}
@Override
public View getView(final int position, View convertView, ViewGroup parent)
{
ViewHolder holder;
if (convertView == null){
holder = new ViewHolder();
convertView = LayoutInflater.from(context).inflate(R.layout.resource, null);
holder.textview = (TextView) convertView.findViewById(R.id.name);
holder.textview2 = (TextView) convertView.findViewById(R.id.email);
holder.btn = (Button) convertView.findViewById(R.id.button);
convertView.setTag(holder);
}else{
holder = (ViewHolder) convertView.getTag();
}
holder.textview.setText(soundcloudList.get(position).getTitle());
holder.textview2.setText(soundcloudList.get(position).getId());
holder.btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(final View v) {
if(((Button)v).getText().toString().equals("Play")){
try{
mMediaPlayer = new MediaPlayer();
mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
mMediaPlayer.setDataSource("http://api.soundcloud.com/tracks/"+soundcloudList.get(position).getId()+"/stream?client_id=e13865f9debacb5f96375fdd96b7fa1b");
mMediaPlayer.prepareAsync();
mMediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mp) {
mp.start();
((Button)v).setText("Pause");
}
});
mMediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mp) {
mMediaPlayer.release();
mMediaPlayer = null;
((Button)v).setText("Play");
}
});
}catch (Exception e){
e.printStackTrace();
}
}else{
mMediaPlayer.release();
mMediaPlayer = null;
((Button)v).setText("Play");
}
notifyDataSetChanged();
}
});
return convertView;
}
static class ViewHolder
{
public TextView textview;
public TextView textview2;
public Button btn;
}
}
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