package com.example.android.miwok;
//all the imports
public class VocabularyManager extends Application{
ProgressBar progress;
ImageButton volup;
ImageButton voldown;
TextView current_vol_text;
//[Cut-out Definitions of Variables]
ImageButton.OnClickListener changevol;
public VocabularyManager(Activity activity, Context context, String Category) {
//Don't wonder, many things up here are also cut-out
dialogview = inflater.inflate(R.layout.player_dialog, null);
volup = dialogview.findViewById(R.id.vol_up); //MARKER #1
voldown = dialogview.findViewById(R.id.vol_down); //MARKER #2
progress = dialogview.findViewById(R.id.progress); //MARKER #3
list = (ListView) this.act.findViewById(R.id.vocabulary_list);
listadapter = new WordAdapter(this.act, mwords);
list.setBackgroundColor(context.getResources().getColor(R.color.category_family));
list.setAdapter(listadapter);
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
list.setEnabled(false);
Word word = mwords.get(i);
timer = new Timer();
dialog = new AlertDialog.Builder(mContext);
dialogview = inflater.inflate(R.layout.player_dialog, null);
volup.setOnClickListener(changevol);
voldown.setOnClickListener(changevol);
progress = dialogview.findViewById(R.id.progress);
current_vol_text = dialogview.findViewById(R.id.current_stream_volume);
current_vol_text.setText(Integer.toString(mAudioManager.getStreamVolume(AudioManager.STREAM_MUSIC)));
//Setting up the 'dialog' AlertDialog.Builder
crdialog = dialog.create();
int result = mAudioManager.requestAudioFocus(mOnAudioFocusChangeListener, AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN_TRANSIENT);
if (result == AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {
if(mMediaPlayer == null) {
mMediaPlayer = MediaPlayer.create(mContext, word.getAudio());
mMediaPlayer.start();
mMediaPlayer.setOnCompletionListener(mCompletionListener);
}
}
progress.setMax(mMediaPlayer.getDuration());
progress.setProgress(0);
crdialog.show();
ttask = new TimerTask() {
@Override
public void run() {
if(mMediaPlayer != null) {
progress.setProgress(mMediaPlayer.getCurrentPosition());
}
}
};
timer.scheduleAtFixedRate(ttask, 0, 50);
}
});
changevol = new View.OnClickListener() {
@Override
public void onClick(View view) {
if(view.getId() == R.id.vol_up){
mAudioManager.adjustStreamVolume(AudioManager.STREAM_MUSIC,AudioManager.ADJUST_RAISE,0);
}
else{
mAudioManager.adjustStreamVolume(AudioManager.STREAM_MUSIC,AudioManager.ADJUST_LOWER,0);
}
current_vol_text.setText(Integer.toString(mAudioManager.getStreamVolume(AudioManager.STREAM_MUSIC)));
}
};
}
}
这段代码的问题是:我正在尝试为两个按钮volup
和voldown
更改OnClickListener(volchange
)中的STREAM_MUSIC
音量。由于某些原因,OnClickListener无法触发,但如果我打开日志,则不会显示任何错误、警告或可疑日志。是什么导致了这种行为?
正如在评论中提到的,这篇文章中不必要的代码部分被删掉了。
发布于 2018-05-29 07:41:40
为了解决这个问题,在volup
**/**voldown
dialogview
ImageButtons被膨胀之后,在OnItemClickListener中初始化-ImageButtons。虽然在类构造函数中初始化了,但这一步需要完成。应该对每个其他视图/小部件执行相同的过程,这些小部件能够通过调用相关方法在UIThread上进行更新。
为什么会有这样的行为?
理论上,在类构造函数中膨胀dialogview
之后,我们可以正确地初始化视图和窗口小部件。但是当我们在构造函数中膨胀dialogview
时(在初始化OnItemClickListener之前),布局本身就会膨胀,直接在调用构造函数之后,并从“二进制”膨胀的布局中获得视图。但问题来了:每次触发OnItemClickListener时,新的二进制布局都会膨胀并保存到dialogview
中。因此,现在应用于dialog
的布局是来自dialogview
-Variable,的新创建的二进制布局,但volup
& voldown
ImageButtons仍然引用先前创建的二进制布局,当我们调用类构造函数时。显然,如果我们在每次创建dialogview
之后都初始化ImageButtons,这些按钮就会引用正确的、新的膨胀布局。
发布于 2018-05-27 02:27:38
尝试删除图像按钮局部声明的final关键字
发布于 2018-05-27 03:08:05
我认为您需要从ImageButton中删除"final“。
https://stackoverflow.com/questions/50545482
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