Question

我通过以下代码获取从服务器到列表视图的所有音频文件列表。

public class ServerFileList extends Activity {

    URL urlAudio;
    ListView mListView;
    ProgressDialog pDialog;
    private MediaPlayer mp = new MediaPlayer();
    private List<String> myList = new ArrayList<String>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        this.requestWindowFeature(Window.FEATURE_NO_TITLE);
        super.onCreate(savedInstanceState);
        setContentView(R.layout.serverfilelist);

        mListView = (ListView) findViewById(R.id.listAudio);
        new getAudiofromServer().execute();
        new downloadAudioFromServer().execute();

        mListView.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                playSong(urlAudio + myList.get(position));
            }
        });
    }

    private void playSong(String songPath) {
        try {
            mp.reset();
            mp.setDataSource(songPath);
            mp.prepare();
            mp.start();
        } catch (IOException e) {
            Log.v(getString(R.string.app_name), e.getMessage());
        }
    }

    private class downloadAudioFromServer extends
            AsyncTask<String, Integer, String> {
        @Override
        protected String doInBackground(String... url) {
            int count;

            try {
                URL url1 = new URL("http://i-qualtech.com/Fidol/uploadAudio");
                URLConnection conexion = url1.openConnection();
                conexion.connect();
                int lenghtOfFile = conexion.getContentLength();
                InputStream input = new BufferedInputStream(url1.openStream());
                OutputStream output = new FileOutputStream(
                        Environment.getExternalStorageDirectory() + "/Sounds/");
                byte data[] = new byte[1024];
                long total = 0;

                while ((count = input.read(data)) != -1) {
                    total += count;
                    // publishing the progress....
                    publishProgress((int) (total * 100 / lenghtOfFile));
                    output.write(data, 0, count);
                }

                output.flush();
                output.close();
                input.close();
            } catch (Exception e) {
            }
            return null;
        }
    }

    class getAudiofromServer extends AsyncTask<String, String, String> {
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            pDialog = new ProgressDialog(ServerFileList.this);
            pDialog.setMessage("Getting File list from server, Please wait...");
            pDialog.setIndeterminate(false);
            pDialog.setCancelable(false);
            pDialog.show();
        }

        @SuppressWarnings("unchecked")
        @Override
        protected String doInBackground(String... arg0) {
            try {
                urlAudio = new URL("http://i-qualtech.com/Fidol/uploadAudio");
            } catch (MalformedURLException e) {
                e.printStackTrace();
            }
            ApacheURLLister lister1 = new ApacheURLLister();
            try {
                myList = lister1.listAll(urlAudio);
            } catch (IOException e) {
                e.printStackTrace();
            }
            return null;
        }

        protected void onPostExecute(String file_url) {
            if (pDialog.isShowing()) {
                pDialog.dismiss();
            }

            ArrayAdapter<String> adapter = new ArrayAdapter<String>(
                    ServerFileList.this, android.R.layout.simple_list_item_1,
                    myList);
            adapter.notifyDataSetChanged();
            mListView.setAdapter(adapter);
            mListView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
            mListView.setCacheColorHint(Color.TRANSPARENT);
        }
    }
}

输出

enter image description here

现在我想通过单击列表视图来播放该音频文件，因为我编写的代码已经在上面列出，但我收到了以下错误。

我在下面提到了链接供参考。

How to play Audio file Mp3 from the server

how to play audio file from server in android

但在这两个链接中，他们指定了特定的音频文件从服务器播放并给出了完整路径，但我不想这样做。

我知道这显然是说我无法将URL转换为String，但我不知道如何解决这个问题。请帮忙。

02-05 01:44:58.690: E/AndroidRuntime(1998): FATAL EXCEPTION: main
02-05 01:44:58.690: E/AndroidRuntime(1998): java.lang.ClassCastException: java.net.URL cannot be cast to java.lang.String
02-05 01:44:58.690: E/AndroidRuntime(1998):     at iqual.fidol_final.ServerFileList$1.onItemClick(ServerFileList.java:53)
02-05 01:44:58.690: E/AndroidRuntime(1998):     at android.widget.AdapterView.performItemClick(AdapterView.java:298)
02-05 01:44:58.690: E/AndroidRuntime(1998):     at android.widget.AbsListView.performItemClick(AbsListView.java:1100)
02-05 01:44:58.690: E/AndroidRuntime(1998):     at android.widget.AbsListView$PerformClick.run(AbsListView.java:2788)
02-05 01:44:58.690: E/AndroidRuntime(1998):     at android.widget.AbsListView$1.run(AbsListView.java:3463)
02-05 01:44:58.690: E/AndroidRuntime(1998):     at android.os.Handler.handleCallback(Handler.java:730)
02-05 01:44:58.690: E/AndroidRuntime(1998):     at android.os.Handler.dispatchMessage(Handler.java:92)
02-05 01:44:58.690: E/AndroidRuntime(1998):     at android.os.Looper.loop(Looper.java:137)
02-05 01:44:58.690: E/AndroidRuntime(1998):     at android.app.ActivityThread.main(ActivityThread.java:5103)
02-05 01:44:58.690: E/AndroidRuntime(1998):     at java.lang.reflect.Method.invokeNative(Native Method)
02-05 01:44:58.690: E/AndroidRuntime(1998):     at java.lang.reflect.Method.invoke(Method.java:525)
02-05 01:44:58.690: E/AndroidRuntime(1998):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
02-05 01:44:58.690: E/AndroidRuntime(1998):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
02-05 01:44:58.690: E/AndroidRuntime(1998):     at dalvik.system.NativeStart.main(Native Method)

Answer 1

为什么不首先通过将URL对象转换为String来准备要播放的正确URL？

改变这个： playSong（urlAudio + myList.get（position））;

到

playSong（urlAudio。 toString（） + myList.get（position））;

Answer 2

我不知道这段代码是否对你有帮助

但尝试一下：

在创建之前

。

Uri uri;

添加到您的代码

mListView.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                //playSong(urlAudio + myList.get(position));
                uri =  Uri.parse(urlAudio);
                playSong(urlAudio + myList.get(position));
            }
        });

添加到playSong：

private void playSong(String songPath) {
try {
    MediaPlayer mp = new MediaPlayer();
    mp.setDataSource(this, uri);
    mp.prepare();
    mp.start();
}
catch (NullReferenceArgument e) {
    Log.d(TAG, "NullReferenceException: " + e.getMessage());
}
catch (IllegalStateException e) {
    Log.d(TAG, "IllegalStateException: " + e.getMessage());
}
catch (IOException e) {
    Log.d(TAG, "IOException: " + e.getMessage());
}
catch (IllegalArgumentException e) {
    Log.d(TAG, "IllegalArgumentException: " + e.getMessage());
}
catch (SecurityException e) {
    Log.d(TAG, "SecurityException: " + e.getMessage());
}

Answer 3

我设法解决了这个问题，只需将下面一段代码添加到我的onItemClicklistner中，它现在工作正常，

String url = null;
Object o = myList.get(position);
url = o.toString().replace(" ", "%20").trim();
play = (PlaySongAsy) new PlaySongAsy(url).execute();

如何从android中的服务器播放音频

3 个答案: