Android Media Player (set dataSource fehlgeschlagen)

Question

Hallo, ich starte mit einer grundlegenden Musik-App, hasst mich nicht, weil ich Recyclerview nicht verwende. Aber die App läuft gut und keine Kraft schließt jedoch, wenn ich auf einen Song klicke, den der Song nicht spielt. Der Android Monitor sagt " Music App Test 1: SetDataSource fehlgeschlagen" Ich bin nicht sicher, ob mein Problem mit meinem Verzeichnis oder nicht verbunden ist, lassen Sie es mich wissen. Lassen Sie mich auch wissen, wenn Sie die XML-Dateien sehen müssen.

package com.example.abhishek.musicapptest1; 

import android.annotation.SuppressLint; 
import android.app.ListActivity; 
import android.media.MediaPlayer; 
import android.net.Uri; 
import android.os.Bundle; 
import android.support.design.widget.FloatingActionButton; 
import android.support.design.widget.Snackbar; 
import android.support.v7.app.AppCompatActivity; 
import android.support.v7.widget.Toolbar; 
import android.util.Log; 
import android.view.View; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.app.Activity; 
import android.view.View.OnClickListener; 
import android.view.View.OnHoverListener; 

import android.widget.ArrayAdapter; 
import android.widget.Button; 
import android.widget.ListAdapter; 
import android.widget.ListView; 

import com.google.android.gms.appindexing.Action; 
import com.google.android.gms.appindexing.AppIndex; 
import com.google.android.gms.common.api.GoogleApiClient; 

import java.io.File; 
import java.io.FilenameFilter; 
import java.io.IOException; 
import java.util.ArrayList; 
import java.util.List; 

class Mp3filter implements FilenameFilter {// filters all files that are mp3 

    @Override 
    public boolean accept(File directory, String song_name) { // will return mp3 
     return (song_name.endsWith(".mp3")); 
    } 
} 

public class MainActivity extends ListActivity { 

    private static final String SD_PATH = new String("/sdcard/Music/Phone Music"); 

    private List<String> songs = new ArrayList<String>(); 
    private MediaPlayer mp = new MediaPlayer(); 
    /** 
    * ATTENTION: This was auto-generated to implement the App Indexing API. 
    * See https://g.co/AppIndexing/AndroidStudio for more information. 
    */ 
    private GoogleApiClient client; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     //Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
     //setSupportActionBar(toolbar); 

     updatePlaylist(); 

     Button stopPlay = (Button) findViewById(R.id.stopBtn); 
     stopPlay.setOnClickListener(new OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       mp.stop(); 
      } 

     }); 


     // ATTENTION: This was auto-generated to implement the App Indexing API. 
     // See https://g.co/AppIndexing/AndroidStudio for more information. 
     client = new GoogleApiClient.Builder(this).addApi(AppIndex.API).build(); 
    } 

    protected void onListItemClick(ListView list, View view, int position, long id) { 
     try { 
      mp.reset(); 
      mp.setDataSource(SD_PATH + songs.get(position)); 
      mp.prepare(); 
      mp.start(); 
     } catch (IOException e) { 
      Log.v(getString(R.string.app_name),e.getMessage()); 
     } 
    } 

    private void updatePlaylist() {// will update the play list, will find the sd card 
     // we need to filter out the files which we dont want 

     File home = new File(SD_PATH); 
     if (home.listFiles(new Mp3filter()).length > 0) { 
      for (File file : home.listFiles(new Mp3filter())) { 
       songs.add(file.getName()); 
      } 

      ArrayAdapter<String> songList = new ArrayAdapter<String>(this, R.layout.song_view, songs); 
      setListAdapter(songList); 

     } 

    } 


    @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_main, 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); 
    } 


    @Override 
    public void onStart() { 
     super.onStart(); 

     // ATTENTION: This was auto-generated to implement the App Indexing API. 
     // See https://g.co/AppIndexing/AndroidStudio for more information. 
     client.connect(); 
     Action viewAction = Action.newAction(
       Action.TYPE_VIEW, // TODO: choose an action type. 
       "Main Page", // TODO: Define a title for the content shown. 
       // TODO: If you have web page content that matches this app activity's content, 
       // make sure this auto-generated web page URL is correct. 
       // Otherwise, set the URL to null. 
       Uri.parse("http://host/path"), 
       // TODO: Make sure this auto-generated app URL is correct. 
       Uri.parse("android-app://com.example.abhishek.musicapptest1/http/host/path") 
     ); 
     AppIndex.AppIndexApi.start(client, viewAction); 
    } 

    @Override 
    public void onStop() { 
     super.onStop(); 

     // ATTENTION: This was auto-generated to implement the App Indexing API. 
     // See https://g.co/AppIndexing/AndroidStudio for more information. 
     Action viewAction = Action.newAction(
       Action.TYPE_VIEW, // TODO: choose an action type. 
       "Main Page", // TODO: Define a title for the content shown. 
       // TODO: If you have web page content that matches this app activity's content, 
       // make sure this auto-generated web page URL is correct. 
       // Otherwise, set the URL to null. 
       Uri.parse("http://host/path"), 
       // TODO: Make sure this auto-generated app URL is correct. 
       Uri.parse("android-app://com.example.abhishek.musicapptest1/http/host/path") 
     ); 
     AppIndex.AppIndexApi.end(client, viewAction); 
     client.disconnect(); 
    } 
} 

Answer 1

Von Ihrem Code überprüfen diese Zeilen:

private static final String SD_PATH = new String("/sdcard/Music/Phone Music"); 
songs.add(file.getName()); 
mp.setDataSource(SD_PATH + songs.get(position)); 

Daher Ihre Datasource kein gültiger Dateiname ist, wird ein Schrägstrich fehlt.