是什么原因导致打开跟踪文件错误：没有这样的文件或目录？

Question

When I run my app in my mobile device, I get this under the logcat :

error opening trace file: No such file or directory (2) . Any one know what met be the cause? I tried to re-build the project and clean it under:

Project > Clean...

But I still get the same error. The app says unfortunately the you cant record on this device, of which is a message I have created under my String.xml files if the phone does not support recordings.

Any one with help please do so. I will be happy to get one.

Here is the code: public class MainActivity extends Activity {

public static final String FILE_DIRECTORY = "iRecorded_Calls";
public ListView listView;
public ScrollView mScrollView;
public TextView mTextView;
public static final String LISTEN_ENABLED = "ListenEnabled";
private static final int CATEGORY_DETAIL = 1;
private static final int NO_MEMORY_CARD = 2;
private static final int TERMS = 3;

public RadioButton radEnable;
public RadioButton radDisable;

public static final int MEDIA_MOUNTED = 0;
public static final int MEDIA_MOUNTED_READ_ONLY = 1;
public static final int NO_MEDIA = 2;

private static Resources res;
private Context context;

@SuppressWarnings("deprecation")
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    startActivity(new Intent(this, HomeActivity.class));

    res = getResources();

    listView = (ListView) findViewById(R.id.mylist);        
    mScrollView = (ScrollView) findViewById(R.id.ScrollView02);
    mTextView = (TextView) findViewById(R.id.txtNoRecords);

    SharedPreferences settings = this.getSharedPreferences(LISTEN_ENABLED,
            0);
    boolean silent = settings.getBoolean("silentMode", false);

    if (!silent)
        showDialog(CATEGORY_DETAIL);

    context = this.getBaseContext();

}
//Explorer the file directory 
@SuppressWarnings("deprecation")
@Override
protected void onResume() {
    if (updateExternalStorageState() == MEDIA_MOUNTED) {
        String filepath = Environment.getExternalStorageDirectory()
                .getPath();
        final File file = new File(filepath, FILE_DIRECTORY);

        if (!file.exists()) {
            file.mkdirs();
        }

        final List<Model> listDir = ListDir2(file);

        filepath = getFilesDir().getAbsolutePath();
        final File file2 = new File(filepath, FILE_DIRECTORY);

        if (!file2.exists()) {
            file2.mkdirs();
        }

        final List<Model> listDir2 = ListDir2(file2);

        listDir.addAll(listDir2);

        if (listDir.isEmpty()) {
            mScrollView.setVisibility(TextView.VISIBLE);
            listView.setVisibility(ScrollView.GONE);
        } else {
            mScrollView.setVisibility(TextView.GONE);
            listView.setVisibility(ScrollView.VISIBLE);
        }

        final CallsAdapter adapter = new CallsAdapter(this, listDir);

        listView.setOnItemClickListener(new OnItemClickListener() {

            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                adapter.showPromotionPieceDialog(listDir.get(position)
                        .getCallName(), position);
            }
        });

Answer 1

I managed to figured out what was the problem on my code and fixed it and now I can be able to recorder the incoming and outgoing calls. The problem was under my RecordSercive class on the recorder part

> //________Test with the Default outputFormat and default
> Encoder________
> 
>           /*  recorder.setAudioSource(MediaRecorder.AudioSource.VOICE_CALL);
>               recorder.setOutputFormat(MediaRecorder.OutputFormat.DEFAULT);
>               recorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);*/
>               
>               //_______End for the Test with the Default outputFortmat and default Encoder________

That is where I got the Message that says unfortunately the you cant record on this device

So I changed my code to this:

> recorder = new MediaRecorder();               
>               recorder.setAudioSource(MediaRecorder.AudioSource.VOICE_DOWNLINK + MediaRecorder.AudioSource.VOICE_UPLINK);//test using the addition sign
> for both DOWNLINK + UPLINK
>               recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
>               recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);                
>               myFileName = getFilename();
>               recorder.setOutputFile(myFileName);

Which worked fine for me, but the sound quality is is a problem, of which I will just have to increase the volume using the

> volume = (AudioManager) getSystemService(Context.AUDIO_SERVICE);

but under the LogCat the on Eclipse when I debug my app, I still get the error opening trace file: No such file or directory (2) . Of which I think it might be caused by other reasons of which I'm currently investigating like (Chris Stratton) mentioned.

Answer 2

In the latest version of Android they have clearly restricted working with a network of the main stream. This had been done for UI not to break. Possibly you raised the API version in the manifest.