以下是我的WordAdapter类
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.
final 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);
}
// 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.setTag(new Integer(position));
imageView.setOnClickListener(new ImageView.OnClickListener() {
// Boolean flag = false;
@Override
public void onClick(View view) {
// Toast.makeText(getContext(), "ImageView clicked for the row = " + view.getTag().toString(), Toast.LENGTH_SHORT).show();
// if ((Integer) view.getTag() == 0) {
// if (flag) {
// ((ImageView) view).setImageResource(R.string.miwok_letter_a);
// flag = false;
// } else {
// ((ImageView) view).setImageResource(R.drawable.ka_se_kamal);
// flag = true;
// }
// }
}
});
return listItemView;
}
}
这是我的Word课程
public class Word {
/** String resource ID for the default translation of the word */
private int mDefaultTranslationId;
/** String resource ID for the Miwok translation of the word */
private int mMiwokTranslationId;
/** Audio resource ID for the word */
private int mAudioResourceId;
/** Image resource ID for the word */
private int mImageResourceId = NO_IMAGE_PROVIDED;
/** Constant value that represents no image was provided for this word */
private static final int NO_IMAGE_PROVIDED = -1;
/**
* Create a new Word object.
*
* @param defaultTranslationId is the string resource ID for the word in a language that the
* user is already familiar with (such as English)
* @param miwokTranslationId is the string resource Id for the word in the Miwok language
* @param audioResourceId is the resource ID for the audio file associated with this word
*/
public Word(int defaultTranslationId, int miwokTranslationId, int audioResourceId) {
mDefaultTranslationId = defaultTranslationId;
mMiwokTranslationId = miwokTranslationId;
mAudioResourceId = audioResourceId;
}
/**
* Create a new Word object.
*
* @param defaultTranslationId is the string resource ID for the word in a language that the
* user is already familiar with (such as English)
* @param miwokTranslationId is the string resource Id for the word in the Miwok language
* @param imageResourceId is the drawable resource ID for the image associated with the word
* @param audioResourceId is the resource ID for the audio file associated with this word
*/
public Word(int defaultTranslationId, int miwokTranslationId, int imageResourceId,
int audioResourceId) {
mDefaultTranslationId = defaultTranslationId;
mMiwokTranslationId = miwokTranslationId;
mImageResourceId = imageResourceId;
mAudioResourceId = audioResourceId;
}
/**
* Get the string resource ID for the default translation of the word.
*/
public int getDefaultTranslationId() {
return mDefaultTranslationId;
}
/**
* Get the string resource ID for the Miwok translation of the word.
*/
public int getMiwokTranslationId() {
return mMiwokTranslationId;
}
/**
* Return the image resource ID of the word.
*/
public int getImageResourceId() {
return mImageResourceId;
}
/**
* Returns whether or not there is an image for this word. */
public boolean hasImage() {
return mImageResourceId != NO_IMAGE_PROVIDED;
}
/**
* Return the audio resource ID of the word.
*/
public int getAudioResourceId() {
return mAudioResourceId;
}
}
以下是我的Fragmnent类
public class VarnamalaConsonantsFragment extends Fragment {
/** Handles playback of all the sound files */
private MediaPlayer mMediaPlayer;
/** Handles audio focus when playing a sound file */
private AudioManager mAudioManager;
/**
* 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) {
// Now that the sound file has finished playing, release the media player resources.
releaseMediaPlayer();
}
};
public VarnamalaConsonantsFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.word_list, container, false);
// Create and setup the {@link AudioManager} to request audio focus
mAudioManager = (AudioManager) getActivity().getSystemService(AUDIO_SERVICE);
// Create a list of words
final ArrayList<Word> words = new ArrayList<Word>();
/** THIS IS THE LIST VIEW WHERE I NEED THE IMAGE (R.DRAWABLE.ka_se_kamal)
WHEN CLICKED SHOULD BE CHANGED TO (R.STRING.miwok_letter_a) */
words.add(new Word(R.string.letter_ka, R.string.miwok_letter_ka,
R.drawable.ka_se_kamal, R.raw.ka_se_kamal_audio));
words.add(new Word(R.string.letter_kha, R.string.miwok_letter_kha,
R.drawable.kha_se_kharghosh, R.raw.kha_se_khargosh_audio));
words.add(new Word(R.string.letter_ga, R.string.miwok_letter_ga,
R.drawable.ga_se_gamla, R.raw.ga_se_gamla_audio));
words.add(new Word(R.string.letter_gha, R.string.miwok_letter_gha,
R.drawable.gha_se_ghar, R.raw.gh_se_ghar_audio));
words.add(new Word(R.string.letter_nga, R.string.miwok_letter_nga,
R.drawable.dya_se_dya, R.raw.ada_audio));
// 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.
WordAdapter adapter = new WordAdapter(getActivity(), words, R.color.category_numbers);
// 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.
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);
// 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();
// 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 onStop() {
super.onStop();
// 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);
}
}
}
我需要将ImageView转换为TextView，以便我可以在ClickView中将我的ListView中的图像切换为文本。如何将ImageView转换为TextView？
列表视图我需要的图像（R.DRAWABLE.ka_se_kamal）时间 点击应该改为（R.STRING.miwok_letter_a）
其他问题没有解决我的问题的原因是所有解决方案都提供了通过setBackgroundResource更改图像视图，其中单击时可以在列表视图中更改图像。但为此我需要为列表中的所有项目创建图像，这些图像可能会占用大量资源..如果列表视图中的图像可以更改为文本视图，那就更好了..
答案 0 :(得分：0)
你必须同时使用imageView和textView。您可以更改可见性。当用户单击imageView时，您可以将其可见性设置为已消失，并将textView的可见性设置为可见。以下代码对我有用：
Boolean flag =false;
@Override
public void onClick(View view) {
// Toast.makeText(getContext(), "ImageView clicked for the row = "+view.getTag().toString(), Toast.LENGTH_SHORT).show();
if(flag){
imageView.setAlpha(255);
// imageView.setImageResource(R.drawable.a_se_anaar);
onClickTextView.setVisibility(View.INVISIBLE);
flag = false;
}else{
imageView.setAlpha(0);
onClickTextView.setVisibility(View.VISIBLE);
flag =true;
}
}