- 我有一个自定义 ListView ，它填充 SQLI 数据库中的单词列表。
- 在每个列表项中，我都有一个播放图像按钮，用于播放该特定列表项的音频文件。
- 我使用了带有数组适配器的自定义 ListView。
- 在该适配器中，我为该图像编写了 setOnClick 事件来播放音频。
- 效果很好。
但问题是在播放音频时，如果有人点击其他 Activity ，声音不会停止。
这是我的 Activity 课
public class WordActivity extends ActionBarActivity {
categories category_obj;
word word_obj;
wordDB wordDb;
ViewFlipper viewFlipper;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_word);
TextView txt = (TextView) findViewById(R.id.phraseListHeading);
Typeface font = Typeface.createFromAsset(WordActivity.this.getAssets(), "fonts/NotoSans-Regular.ttf");
String categoryName = getIntent().getExtras().getString("categoryName").toUpperCase();
category_obj = (categories) getIntent().getSerializableExtra("category_obj");
txt.setTypeface(font);
txt.setText(categoryName);
ListView wordListView;
wordListView = (ListView)findViewById(R.id.list_view_word);
wordListView.setOnItemClickListener(new AdapterView.OnItemClickListener(){
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Object o = parent.getItemAtPosition(position);
word_obj = (word) o;
if(Integer.valueOf(word_obj.getCategoryId())>=0) {
Intent myIntent = new Intent(WordActivity.this, WordDetailsActivity.class);
myIntent.putExtra("word_obj", word_obj);
myIntent.putExtra("position",position);
myIntent.putExtra("currentClickedId", word_obj.getCsvWordId().toString());
myIntent.putExtra("favouriteFlag",0);
myIntent.putExtra("searchFlag",0);
myIntent.putExtra("searchString", "");
WordActivity.this.startActivity(myIntent);
}
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_word, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
protected void onResume(){
super.onResume();
GlobalState state = ((GlobalState) getApplicationContext());
state.doAction();
wordDb = new wordDB(WordActivity.this);
getAllWords();
}
public void getAllWords(){
ArrayList<word> words = new ArrayList<word>();
category_obj = (categories) getIntent().getSerializableExtra("category_obj");
Cursor row = wordDb.selectWordList(category_obj.getCsvCategoryId().toString());
words.add(new word("-1","-1","","","","","","","x.mp3",""));
words.add(new word("-2","-2","","","","","","","x.mp3",""));
row.moveToFirst();
while (!row.isAfterLast()) {
//Log.d("Data id: ", row.getString(2));
words.add( new word(row.getString(0),row.getString(1),row.getString(2),row.getString(3),row.getString(4),row.getString(5),row.getString(6),row.getString(7),row.getString(8),row.getString(9)));
row.moveToNext();
}
row.close();
WordAdapter adapter = new WordAdapter(WordActivity.this, words);
ListView listView = (ListView) findViewById(R.id.list_view_word);
listView.setAdapter(adapter);
}
}
这是我的适配器类
class WordAdapter extends ArrayAdapter {
ArrayList<word> words = new ArrayList<word>();
private Context mContext;
MediaPlayer mediaPlayer;
public WordAdapter(Context context, ArrayList<word> list) {
super(context, R.layout.words_list, list);
mContext = context;
words = list;
}
public View getView(int position, View convertView, final ViewGroup parent) {
View view;
if (convertView == null) {
LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.words_list, null);
TextView txt = (TextView) view.findViewById(R.id.list_view_words);
TextView txt2 = (TextView) view.findViewById(R.id.translated_text);
TextView txt3 = (TextView) view.findViewById(R.id.pronounce);
Typeface font = Typeface.createFromAsset(mContext.getAssets(), "fonts/NotoSans-Regular.ttf");
txt.setTypeface(font);
txt2.setTypeface(font);
txt3.setTypeface(font);
}
else {
view = convertView;
}
if(Integer.valueOf(words.get(position).getCsvWordId())>=0) {
View divbottom = (View) view.findViewById(R.id.phrase_list_bottom_divider);
divbottom.setVisibility(View.VISIBLE);
ImageView playAudio = (ImageView) view.findViewById(R.id.phraselist_play_audio);
playAudio.setVisibility(View.VISIBLE);
} else {
View divbottom = (View) view.findViewById(R.id.phrase_list_bottom_divider);
divbottom.setVisibility(View.GONE);
ImageView playAudio = (ImageView) view.findViewById(R.id.phraselist_play_audio);
playAudio.setVisibility(View.GONE);
}
TextView contactNameView = (TextView) view.findViewById(R.id.list_view_words);
Integer mainTextlen = words.get(position).getMainText().length();
contactNameView.setText( words.get(position).getMainText() );
if(mainTextlen > 40)
{
TextView txt = (TextView) view.findViewById(R.id.list_view_words);
txt.setTextSize(14);
}
TextView translatedText = (TextView) view.findViewById(R.id.translated_text);
translatedText.setText(words.get(position).getTranslationText());
Integer transTextlen = words.get(position).getTranslationText().length();
if(transTextlen > 40)
{
TextView txt2 = (TextView) view.findViewById(R.id.translated_text);
txt2.setTextSize(14);
}
TextView pronounceText = (TextView) view.findViewById(R.id.pronounce);
pronounceText.setText(words.get(position).getPronunciation_in_english());
Integer pronounceTextlen = words.get(position).getPronunciation_in_english().length();
if(pronounceTextlen > 40)
{
TextView txt3 = (TextView) view.findViewById(R.id.pronounce);
txt3.setTextSize(12);
}
/*get full sound file name*/
Integer fileNameLength = words.get(position).getAudio().toString().length();
String fileName = words.get(position).getAudio().toString();
final String soundFile = fileName.substring(0, fileNameLength - 4);
final ImageView imgPlay = (ImageView) view.findViewById(R.id.phraselist_play_audio);
imgPlay.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
View parentRow = (View) v.getParent();
ListView listView = (ListView) parentRow.getParent();
if(mediaPlayer == null) {
final int position = listView.getPositionForView(parentRow);
try {
Uri mp3 = Uri.parse("android.resource://" + mContext.getPackageName() + "/raw/" + soundFile);
mediaPlayer = new MediaPlayer();
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
mediaPlayer.setDataSource(mContext, mp3);
mediaPlayer.prepare(); // might take long! (for buffering, etc)
mediaPlayer.start();
imgPlay.setImageResource(R.drawable.playactive);
// mediaPlayer.setOnCompletionListener(onCompletionListener);
mediaPlayer.setOnCompletionListener(new OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mp) {
mediaPlayer.release();
mediaPlayer = null;
imgPlay.setImageResource(R.drawable.playinactive);
}
});
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SecurityException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
});
return view;
}
}
最佳答案
But the problem is while playing the audio if anybody click on other activity the sound does not stop
在 WordAdapter 中创建一个 getter 方法，该方法返回当前正在播放的 MediaPlayer 实例，并在启动下一个 Activity 之前在 onItemClick 内调用它，例如:
public MediaPlayer getMPlayerInstace(){
return this.mediaPlayer;
}
现在在 onItemClick 中调用 stop 方法:
MediaPlayer mPlayer;
mPlayer=adapter.getMPlayerInstace();
if(mPlayer!=null){
mPlayer.stop();
mPlayer.release();
}
关于java - 来自自定义适配器的图像上的 Android 自定义 ListView OnClick 事件，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/36027728/