我的应用程序中发生了一些非常不寻常的事情。当我单击此视图时,我将前一个位置设置为当前位置,以便下次按下该视图时,方法notifyItemChanged(position)将刷新前一个位置。奇怪的是,它第一次就像魅力一样,但是当它第二次或第三次等等时,它不会刷新项目。在logcat中,一切似乎都很正常。它通过代码没有警告或错误。这是我的代码:
我的变量previous_pos初始化在我的Adapter类的顶部。
private int previous_pos = -1;
这是我的Adapter类的片段
@Override
public void onBindViewHolder(@NonNull final TrackHolder holder, final int position) {
holder.mInstrumentalName.setText(tracks.get(position).getInstrumentalName());
holder.mProducer.setText(tracks.get(position).getProducer());
Log.d("position", Integer.toString(holder.getAdapterPosition()));
holder.mPlayButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (previous_pos != -1) {
notifyItemChanged(previous_pos);
}
previous_pos = holder.getAdapterPosition();
holder.mPlayButton.toggle();
if (mediaPlayer.isPlaying()) {
mediaPlayer.reset();
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
try {
mediaPlayer.setDataSource(tracks.get(position).getMusicLink());
} catch (IOException e) {
e.printStackTrace();
}
mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mediaPlayer) {
mediaPlayer.start();
}
});
mediaPlayer.prepareAsync();
} else {
mediaPlayer.reset();
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
try {
mediaPlayer.setDataSource(tracks.get(position).getMusicLink());
previous_link = tracks.get(position).getMusicLink();
} catch (IOException e) {
e.printStackTrace();
}
mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mediaPlayer) {
mediaPlayer.start();
}
});
mediaPlayer.prepareAsync();
}
}
});
mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mediaPlayer) {
mediaPlayer.release();
}
});
holder.setItemClickListener(new ItemClickListener() {
@Override
public void onItemClick(View v, int pos) {
Toast.makeText(context, Integer.toString(tracks.size()), Toast.LENGTH_SHORT).show();
}
});
}
holder.mPlayButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (previous_pos != -1) {
notifyItemChanged(previous_pos);
}
previous_pos = holder.getAdapterPosition();
holder.mPlayButton.toggle();
if (mediaPlayer.isPlaying()) {
mediaPlayer.reset();
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
try {
mediaPlayer.setDataSource(tracks.get(position).getMusicLink());
} catch (IOException e) {
e.printStackTrace();
}
mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mediaPlayer) {
mediaPlayer.start();
}
});
mediaPlayer.prepareAsync();
} else {
mediaPlayer.reset();
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
try {
mediaPlayer.setDataSource(tracks.get(position).getMusicLink());
previous_link = tracks.get(position).getMusicLink();
} catch (IOException e) {
e.printStackTrace();
}
mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mediaPlayer) {
mediaPlayer.start();
}
});
mediaPlayer.prepareAsync();
}
}
});
只需将你的setOnClickListener
从onBindViewHolder
移动到onCreateViewHolder
。