У меня есть просмотр списка с изображением, и когда изображение щелкается, оно исчезает и возвращается к нормальному состоянию при повторном щелчке по тому же изображению с помощью следующего кода моего адаптера:
imageView.setTag(position);
if(currentWord.isFlag)
{
imageView.setAlpha(60);
}
else
{
imageView.setAlpha(255);
}
код работает нормально. когда пользователь щелкает изображение в списке, оно исчезает imageView.setAlpha(60);, а когда пользователь нажимает на то же изображение, оно становится нормальным. imageView.setAlpha(100);
Мой WordAdapter выглядит следующим образом:
public class WordAdapter extends ArrayAdapter<Word> {
/** Resource ID for the background color for this list of words */
private int mColorResourceId;
/**
* Create a new {@link WordAdapter} object.
*
* @param context is the current context (i.e. Activity) that the adapter is being created in.
* @param words is the list of {@link Word}s to be displayed.
* @param colorResourceId is the resource ID for the background color for this list of words
*/
public WordAdapter(Context context, ArrayList<Word> words, int colorResourceId) {
super(context, 0, words);
mColorResourceId = colorResourceId;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// Check if an existing view is being reused, otherwise inflate the view
View listItemView = convertView;
if (listItemView == null) {
listItemView = LayoutInflater.from(getContext()).inflate(
R.layout.list_item, parent, false);
}
// Get the {@link Word} object located at this position in the list
final Word currentWord = getItem(position);
// Find the TextView in the list_item.xml layout with the ID miwok_text_view.
TextView miwokTextView = (TextView) listItemView.findViewById(R.id.miwok_text_view);
// Get the Miwok translation from the currentWord object and set this text on
// the Miwok TextView.
miwokTextView.setText(currentWord.getMiwokTranslationId());
// Find the TextView in the list_item.xml layout with the ID default_text_view.
TextView defaultTextView = (TextView) listItemView.findViewById(R.id.default_text_view);
// Get the default translation from the currentWord object and set this text on
// the default TextView.
defaultTextView.setText(currentWord.getDefaultTranslationId());
// Find the ImageView in the list_item.xml layout with the ID image.
final ImageView imageView = (ImageView) listItemView.findViewById(R.id.image);
// Check if an image is provided for this word or not
if (currentWord.hasImage()) {
// If an image is available, display the provided image based on the resource ID
imageView.setImageResource(currentWord.getImageResourceId());
// Make sure the view is visible
imageView.setVisibility(View.VISIBLE);
} else {
// Otherwise hide the ImageView (set visibility to GONE)
imageView.setVisibility(View.GONE);
}
// добавляем тег для определения положения вида при щелчке по представлению.
imageView.setTag (положение);
// Set the theme color for the list item
View textContainer = listItemView.findViewById(R.id.text_container);
// Find the color that the resource ID maps to
int color = ContextCompat.getColor(getContext(), mColorResourceId);
// Set the background color of the text container View
textContainer.setBackgroundColor(color);
// Return the whole list item layout (containing 2 TextViews) so that it can be shown in
// the ListView.
// ImageView imageView = (ImageView) listItemView.findViewById(R.id.list_item);
imageView.setOnClickListener(new ImageView.OnClickListener() {
@Override
public void onClick(View view) {
if(currentWord.isFlag){
currentWord.isFlag = false;
}else{
currentWord.isFlag = true;
}
notifyDataSetChanged();
}
});
if(currentWord.isFlag)
{
imageView.setAlpha(60);
}
else
{
imageView.setAlpha(255);
}
return listItemView;
}
}
ниже приведен мой класс фрагмента
public class FamilyFragment extends Fragment {
/** to check whether Activity is Active */
static boolean isActive = true;
/** Stores the last selected position */
private int lastSelectedPosition = -1;
/** Handles playback of all the sound files */
private MediaPlayer mMediaPlayer;
/** Handles audio focus when playing a sound file */
private AudioManager mAudioManager;
// Create a list of words
private ArrayList<Word> words = new ArrayList<Word>();
WordAdapter adapter;
/**
* This listener gets triggered whenever the audio focus changes
* (i.e., we gain or lose audio focus because of another app or device).
*/
private AudioManager.OnAudioFocusChangeListener mOnAudioFocusChangeListener = new AudioManager.OnAudioFocusChangeListener() {
@Override
public void onAudioFocusChange(int focusChange) {
if (focusChange == AudioManager.AUDIOFOCUS_LOSS_TRANSIENT ||
focusChange == AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK) {
// The AUDIOFOCUS_LOSS_TRANSIENT case means that we've lost audio focus for a
// short amount of time. The AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK case means that
// our app is allowed to continue playing sound but at a lower volume. We'll treat
// both cases the same way because our app is playing short sound files.
// Pause playback and reset player to the start of the file. That way, we can
// play the word from the beginning when we resume playback.
mMediaPlayer.pause();
mMediaPlayer.seekTo(0);
} else if (focusChange == AudioManager.AUDIOFOCUS_GAIN) {
// The AUDIOFOCUS_GAIN case means we have regained focus and can resume playback.
mMediaPlayer.start();
} else if (focusChange == AudioManager.AUDIOFOCUS_LOSS) {
// The AUDIOFOCUS_LOSS case means we've lost audio focus and
// Stop playback and clean up resources
releaseMediaPlayer();
}
}
};
/**
* This listener gets triggered when the {@link MediaPlayer} has completed
* playing the audio file.
*/
private MediaPlayer.OnCompletionListener mCompletionListener = new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mediaPlayer) {
if(lastSelectedPosition != -1){
Word lastWord = words.get(lastSelectedPosition);
lastWord.isPlaying = false;
lastSelectedPosition = -1;
adapter.notifyDataSetChanged();
}
// Now that the sound file has finished playing, release the media player resources.
releaseMediaPlayer();
}
};
public FamilyFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
final View rootView = inflater.inflate(R.layout.word_list, container, false);
// Create and setup the {@link AudioManager} to request audio focus
mAudioManager = (AudioManager) getActivity().getSystemService(Context.AUDIO_SERVICE);
// Create a list of words
words.add(new Word(R.string.family_father, R.string.miwok_family_father,
R.drawable.family_father,R.string.miwok_family_father, R.raw.family_father));
words.add(new Word(R.string.family_mother, R.string.miwok_family_mother,
R.drawable.family_mother,R.string.miwok_family_mother, R.raw.family_mother));
words.add(new Word(R.string.family_son, R.string.miwok_family_son,
R.drawable.family_son, R.string.miwok_family_son, R.raw.family_son));
words.add(new Word(R.string.family_daughter, R.string.miwok_family_daughter,
R.drawable.family_daughter,R.string.miwok_family_daughter, R.raw.family_daughter));
words.add(new Word(R.string.family_older_brother, R.string.miwok_family_older_brother,
R.drawable.family_older_brother, R.string.miwok_family_older_brother, R.raw.family_older_brother));
words.add(new Word(R.string.family_younger_brother, R.string.miwok_family_younger_brother,
R.drawable.family_younger_brother, R.string.miwok_family_younger_brother, R.raw.family_younger_brother));
words.add(new Word(R.string.family_older_sister, R.string.miwok_family_older_sister,
R.drawable.family_older_sister,R.string.miwok_family_older_sister, R.raw.family_older_sister));
words.add(new Word(R.string.family_younger_sister, R.string.miwok_family_younger_sister,
R.drawable.family_younger_sister, R.string.miwok_family_younger_sister, R.raw.family_younger_sister));
words.add(new Word(R.string.family_grandmother, R.string.miwok_family_grandmother,
R.drawable.family_grandmother, R.string.miwok_family_grandmother, R.raw.family_grand_mother));
words.add(new Word(R.string.family_grandfather, R.string.miwok_family_grandfather,
R.drawable.family_grandfather, R.string.miwok_family_grandfather, R.raw.family_grand_father));
// Create an {@link WordAdapter}, whose data source is a list of {@link Word}s. The
// adapter knows how to create list items for each item in the list.
adapter = new WordAdapter(getActivity(), words, R.color.category_family);
// Find the {@link ListView} object in the view hierarchy of the {@link Activity}.
// There should be a {@link ListView} with the view ID called list, which is declared in the
// word_list.xml layout file.
final ListView listView = (ListView) rootView.findViewById(R.id.list);
// Make the {@link ListView} use the {@link WordAdapter} we created above, so that the
// {@link ListView} will display list items for each {@link Word} in the list.
listView.setAdapter(adapter);
// Set a click listener to play the audio when the list item is clicked on
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) {
// Release the media player if it currently exists because we are about to
// play a different sound file
releaseMediaPlayer();
// Get the {@link Word} object at the given position the user clicked on
Word word = words.get(position);
word.isPlaying = true;
if(lastSelectedPosition != -1){
Word lastWord = words.get(lastSelectedPosition);
lastWord.isPlaying = false;
}
lastSelectedPosition = position;
adapter.notifyDataSetChanged();
// Request audio focus so in order to play the audio file. The app needs to play a
// short audio file, so we will request audio focus with a short amount of time
// with AUDIOFOCUS_GAIN_TRANSIENT.
int result = mAudioManager.requestAudioFocus(mOnAudioFocusChangeListener,
AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN_TRANSIENT);
if (result == AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {
// We have audio focus now.
// Create and setup the {@link MediaPlayer} for the audio resource associated
// with the current word
mMediaPlayer = MediaPlayer.create(getActivity(), word.getAudioResourceId());
// Start the audio file
mMediaPlayer.start();
word.isPlaying = true;
adapter.notifyDataSetChanged();
// Get the value of currentVolume
int currentVolume = mAudioManager.getStreamVolume(AudioManager.STREAM_MUSIC);
// If currentVolume is set to 0, show Toast
if (currentVolume ==0){
Toast.makeText(getContext(), "Please Turn the Volume Up ", Toast.LENGTH_SHORT).show();
}
// Setup a listener on the media player, so that we can stop and release the
// media player once the sound has finished playing.
mMediaPlayer.setOnCompletionListener(mCompletionListener);
}
}
});
return rootView;
}
@Override
public void onStart() {
super.onStart();
isActive = true;
}
@Override
public void onStop() {
super.onStop();
isActive = false;
// When the activity is stopped, release the media player resources because we won't
// be playing any more sounds.
releaseMediaPlayer();
}
/**
* Clean up the media player by releasing its resources.
*/
private void releaseMediaPlayer() {
// If the media player is not null, then it may be currently playing a sound.
if (mMediaPlayer != null) {
// Regardless of the current state of the media player, release its resources
// because we no longer need it.
mMediaPlayer.release();
// Set the media player back to null. For our code, we've decided that
// setting the media player to null is an easy way to tell that the media player
// is not configured to play an audio file at the moment.
mMediaPlayer = null;
// Regardless of whether or not we were granted audio focus, abandon it. This also
// unregisters the AudioFocusChangeListener so we don't get anymore callbacks.
mAudioManager.abandonAudioFocus(mOnAudioFocusChangeListener);
}
}
}
Теперь моя проблема в том, что если пользователь щелкает одно изображение, оно исчезает. imageView.setAlpha(60);, и когда он щелкает другое изображение в списке, оно также исчезает, imageView.setAlpha(60);, но без возврата назад , ранее щелкнувшего ранее. изображение (в списке) возвращается к обычному. imageView.setAlpha(100);
как получить желаемый результат ..