Question

我有一个列表视图，显示文件夹/diarioscolastico

中的所有文件

这是我的代码

public class ActivityRegistrazione extends ActionBarActivity {

    private static final String LOG_TAG = "AudioRecordTest";
    private static String mFileName = null;
    private MediaRecorder mRecorder = null;
    private MediaPlayer   mPlayer = null;

    //Used for audio listview
    private List<String> myList;
    File file;
    ArrayAdapter<String> adapter;

    //Variabile usata per usare un solo bottone come start/stop
    boolean mStartRecording = true;

    private void onRecord(boolean start) {
        if (start) {

            //Creo un file per ogni registrazione che viene fatta partire
            File mFolder = new File(Environment.getExternalStorageDirectory() + "/diarioscolastico");
            mFileName = Environment.getExternalStorageDirectory() + "/diarioscolastico";


            boolean success = true;
            if (!mFolder.exists()) {
                success = mFolder.mkdir();
            }
            if (success) {

                // Create an audio file name
                String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
                String audioFileName = "AUDIO_" + timeStamp + "_.3gp";
                // Do something on success
                mFileName += "/"+ audioFileName ;

            } else {
                // Do something else on failure
            }

            startRecording();

        } else {
            stopRecording();

            //Aggiorno la listview con la nuova immagine
            //Lista con il nuovo elemento
            List<String> myNewList = new ArrayList<>();
            File directory = Environment.getExternalStorageDirectory();
            file = new File( directory + "/diarioscolastico" );
            File list[] = file.listFiles();

            for( int i=0; i< list.length; i++)
            {
                myNewList.add(0,list[i].getName());
            }
                //Aggiorno la Listview dell'activity con il nuovo inserimento
                myList.clear();
                myList.addAll(myNewList);
                adapter.notifyDataSetChanged();
        }
    }

    private void startRecording() {
        mRecorder = new MediaRecorder();
        mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
        mRecorder.setOutputFile(mFileName);
        mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);

        try {
            mRecorder.prepare();
        } catch (IOException e) {
            Log.e(LOG_TAG, "prepare() failed");
        }

        mRecorder.start();
    }

    private void stopRecording() {
        mRecorder.stop();
        mRecorder.release();
        mRecorder = null;
    }

    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);

        setContentView(R.layout.activity_registrazione);

        final Button recButton = (Button) findViewById(R.id.recButton);
        recButton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                // Perform action on click

               onRecord(mStartRecording);
                if (mStartRecording) {
                    recButton.setText("Stop");
                } else {
                    recButton.setText("Rec");
                }
                mStartRecording = !mStartRecording;
            }
        });

        ListView audioListView = (ListView) findViewById(R.id.audioList);
        myList = new ArrayList<>();

        adapter = new ArrayAdapter<>(this,
                android.R.layout.simple_list_item_1, android.R.id.text1, myList);

        File directory = Environment.getExternalStorageDirectory();
        file = new File( directory + "/diarioscolastico" );
        File list[] = file.listFiles();

        for( int i=0; i< list.length; i++)
        {
            myList.add(0, list[i].getName());
        }

        audioListView.setAdapter(adapter); //Set all the file in the list.

        // ListView Item Click Listener
        audioListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

                //TODO play the touched audio file in listview


            }
        });

    }

    @Override
    public void onPause() {
        super.onPause();
        if (mRecorder != null) {
            mRecorder.release();
            mRecorder = null;
        }

        if (mPlayer != null) {
            mPlayer.release();
            mPlayer = null;
        }
    }


@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_activity_registrazione, 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);
}
}

我的问题是，当我点击列表视图中的音频文件时，我不知道如何启动某些媒体播放器来收听音频。我找到了一些holdoverflow帖子，但是它们发布在2010年。

我也找到了这个代码：

Uri myUri = ....; // initialize Uri here
MediaPlayer mediaPlayer = new MediaPlayer();
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
mediaPlayer.setDataSource(getApplicationContext(), myUri);
mediaPlayer.prepare();
mediaPlayer.start();

但是如何从listview音频文件名中取出uri？

有更好的方法可以做到这一点吗？我可以使用一些意图来使用标准的audioplayer吗？

Answer 1

您可以使用您知道的外部存储的文件路径，然后从中获取URI，从而使用它来启动设备的标准音频播放器

Intent intent = new Intent();  
intent.setAction(android.content.Intent.ACTION_VIEW);  
File file = new File("your file path");  
intent.setDataAndType(Uri.fromFile(file), "audio/*");  
startActivity(intent);

由于

Android在列表视图中播放音频文件

1 个答案: