Android自定义ListView OnClick，甚至来自自定义适配器的图像

Question

• I have a custom listview which populates list of words from sqli database.
  • In each list item I have a play image button to play a audio file for that particular list item.
  • I have used a Custom ListView with array adapter.
  • In that adapter I have write the setOnClick event for that image to play the audio.
  • It works fine.

But the problem is while playing the audio if anybody click on other activity the sound does not stop.

here is my activity class

 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);



    }


}

here is my adapter class

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;
    }




}

Answer 1

But the problem is while playing the audio if anybody click on other activity the sound does not stop

Create a getter method in WordAdapter which return current playing MediaPlayer instance and call it inside onItemClick before starting next Activity like:

 public MediaPlayer getMPlayerInstace(){
   return this.mediaPlayer;
}

Now call stop method in onItemClick :

MediaPlayer mPlayer;
mPlayer=adapter.getMPlayerInstace();
if(mPlayer!=null){
    mPlayer.stop();
    mPlayer.release();
}