meh zwischenstand, aber android studio ist abgeschmiert. hab paar activities gemacht.

app/build.gradle

@@ -23,4 +23,5 @@ dependencies {
     compile fileTree(dir: 'libs', include: ['*.jar'])
     testCompile 'junit:junit:4.12'
     compile 'com.android.support:appcompat-v7:22.2.0'
+    compile 'com.android.support:design:22.2.0'
 }

app/src/main/AndroidManifest.xml

@@ -15,6 +15,11 @@
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
+        <activity
+            android:name=".ManagePlaylistsActivity"
+            android:label="@string/title_activity_manage_playlists"
+            android:theme="@style/AppTheme.NoActionBar" />
+        <activity android:name=".PlaylistEditor"></activity>
     </application>
 
 </manifest>
\ No newline at end of file

app/src/main/java/com/soundapp/alisajung/ambientsounds/MainActivity.java

 package com.soundapp.alisajung.ambientsounds;
 
 import android.content.ContentResolver;
+import android.content.Intent;
 import android.database.Cursor;
 import android.media.MediaPlayer;
 import android.net.Uri;
@@ -22,12 +23,23 @@ public class MainActivity extends AppCompatActivity {
     private static final String TAG = "LOGTAG";
 
 
+    public void loadEditPlaylistsActivity(View view){
+
+        Log.d(TAG,"Button pressed");
+        Intent intent = new Intent(this, ManagePlaylistsActivity.class);
+        startActivity(intent);
+    }
+
+    public void stopAll(View view){
+        Log.d(TAG, "TODO: stop playing stuff.");
+    }
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
 
-        mediaList = (ListView) findViewById(R.id.medialist1);
+       /* mediaList = (ListView) findViewById(R.id.medialist1);
         ContentResolver cr = getContentResolver();
 
         mediaImporter = new MediaImporter(cr,mediaList, getApplicationContext());
@@ -43,6 +55,6 @@ public class MainActivity extends AppCompatActivity {
         });
 
         loadMediaButton = (Button) findViewById(R.id.loadmedia);
-        loadMediaButton.setOnClickListener(mediaImporter);
+        loadMediaButton.setOnClickListener(mediaImporter);*/
     }
 }

app/src/main/java/com/soundapp/alisajung/ambientsounds/ManagePlaylistsActivity.java

+package com.soundapp.alisajung.ambientsounds;
+
+import android.content.Intent;
+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;
+
+public class ManagePlaylistsActivity extends AppCompatActivity {
+
+    public static int PLAYLIST_ADD = 0;
+    public static int PLAYLIST_EDIT = 1;
+    public static String EDIT_MODE = "editmode";
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_manage_playlists);
+    }
+
+    public void backToMainMenu(View view){
+        Log.d("Hallo", "Back To main Menu pressed");
+        finish();
+    }
+
+    public void addPlaylist(View view){
+        Log.d("Hallo", "TODO: Add Playlist");
+
+        Intent intent = new Intent(this, PlaylistEditor.class);
+        int message = PLAYLIST_ADD;
+        intent.putExtra(EDIT_MODE,PLAYLIST_ADD);
+        startActivity(intent);
+    }
+
+}

app/src/main/java/com/soundapp/alisajung/ambientsounds/PlaylistEditor.java

+package com.soundapp.alisajung.ambientsounds;
+
+import android.content.ContentResolver;
+import android.content.ContentUris;
+import android.content.Context;
+import android.content.Intent;
+import android.database.Cursor;
+import android.media.AudioManager;
+import android.media.MediaPlayer;
+import android.net.Uri;
+import android.support.v7.app.AppCompatActivity;
+import android.os.Bundle;
+import android.util.Log;
+import android.view.View;
+import android.widget.AdapterView;
+import android.widget.ArrayAdapter;
+import android.widget.Button;
+import android.widget.ListView;
+
+import java.io.IOException;
+import java.util.ArrayList;
+
+public class PlaylistEditor extends AppCompatActivity implements AdapterView.OnItemClickListener {
+
+
+    private ContentResolver contentResolver;
+    private static String LOGTAG = "Media Importer";
+    private ListView mediaListView;
+    private Context context;
+    private ArrayList arrayListTitles;
+    private ArrayList<Long> arrayListIds;
+    private ArrayAdapter arrayAdapater;
+
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_playlist_editor);
+
+        mediaListView = (ListView) findViewById(R.id.medialist1);
+        ContentResolver cr = getContentResolver();
+
+        Intent intent = getIntent();
+
+        int message = intent.getIntExtra(ManagePlaylistsActivity.EDIT_MODE,-1);
+        Log.d("Hilfe", "Test");
+        Log.d("Hilfe", "Message: " + message);
+        if (message == ManagePlaylistsActivity.PLAYLIST_ADD){
+            Log.d("Hilfe", "bla");
+
+            arrayListIds = new ArrayList<Long>();
+            Log.d("Hilfe", "bla4");
+            mediaListView.setOnItemClickListener(this);
+            Log.d("Hilfe", "bla5");
+            //loadMedia();
+            //Log.d("Hilfe", "bla3");
+
+        }
+        else if (message == ManagePlaylistsActivity.PLAYLIST_EDIT){
+
+        }
+        else{
+            Log.d("Hilfe", "FUCK FUCK FUCK "+message + " sollte " + ManagePlaylistsActivity.PLAYLIST_ADD);
+        }
+    }
+
+    private void loadMedia() {
+        Uri uri = android.provider.MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
+        Cursor cursor = contentResolver.query(uri, null, null, null, null);
+        long lastid = 0;
+
+
+        if (cursor == null) {
+            Log.d(LOGTAG, "Cursor fail");
+            // query failed, handle error.
+        } else if (!cursor.moveToFirst()) {
+            Log.d(LOGTAG, "Curser move fist fail");
+            // no media on the device
+        } else {
+            Log.d(LOGTAG, "Stuff.");
+
+            arrayListTitles = new ArrayList();
+            arrayAdapater = new ArrayAdapter(context, android.R.layout.simple_list_item_1, arrayListTitles);
+            mediaListView.setAdapter(arrayAdapater);
+            int titleColumn = cursor.getColumnIndex(android.provider.MediaStore.Audio.Media.TITLE);
+            int idColumn = cursor.getColumnIndex(android.provider.MediaStore.Audio.Media._ID);
+            arrayListIds.clear();
+            arrayListTitles.clear();
+            do {
+                long thisId = cursor.getLong(idColumn);
+                String thisTitle = cursor.getString(titleColumn);
+
+                Log.d(LOGTAG, "Logging!" + thisTitle);
+                // ...process entry...
+                lastid = thisId;
+                arrayListTitles.add(thisTitle);
+                arrayListIds.add(thisId);
+            } while (cursor.moveToNext());
+
+//            playSongWithID(lastid);
+
+        }
+    }
+
+    public void playSongWithID(long id){
+        Log.d(LOGTAG, "Try playing ");
+        Uri contentUri = ContentUris.withAppendedId(
+                android.provider.MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, id);
+
+        MediaPlayer mMediaPlayer = new MediaPlayer();
+        mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
+        try {
+            mMediaPlayer.setDataSource(context, contentUri);
+        } catch (IOException e) {
+            Log.d(LOGTAG, "Fail. mist.");
+            e.printStackTrace();
+        }
+        try {
+            mMediaPlayer.prepare();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        mMediaPlayer.start();
+    }
+
+    @Override
+    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
+        playSongWithID(arrayListIds.get(position));
+    }
+}

app/src/main/res/layout/activity_main.xml

@@ -9,36 +9,31 @@
     android:paddingTop="@dimen/activity_vertical_margin"
     tools:context="com.soundapp.alisajung.ambientsounds.MainActivity">
 
-    <TextView
+    <ListView
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="toller text"
-        android:id="@+id/textView" />
+        android:id="@+id/medialist1"
+        android:layout_alignParentLeft="true"
+        android:layout_alignParentStart="true"
+        android:layout_marginTop="58dp"
+        android:clickable="true" />
 
     <Button
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="Play Sample"
-        android:id="@+id/sampleButton1"
-        android:layout_below="@+id/textView"
-        android:layout_alignParentLeft="true"
-        android:layout_alignParentStart="true" />
+        android:text="Edit Lists"
+        android:id="@+id/editlists"
+        android:onClick="loadEditPlaylistsActivity"
+        android:layout_alignParentRight="true"
+        android:layout_alignParentEnd="true" />
 
     <Button
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="Load Media"
-        android:id="@+id/loadmedia"
-        android:layout_below="@+id/textView"
-        android:layout_centerHorizontal="true" />
+        android:text="Stop all"
+        android:id="@+id/button5"
 
-    <ListView
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:id="@+id/medialist1"
-        android:layout_below="@+id/sampleButton1"
+        android:onClick="stopAll"
         android:layout_alignParentLeft="true"
-        android:layout_alignParentStart="true"
-        android:layout_marginTop="58dp"
-        android:clickable="true" />
+        android:layout_alignParentStart="true" />
 </RelativeLayout>

app/src/main/res/layout/activity_manage_playlists.xml

+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:paddingBottom="@dimen/activity_vertical_margin"
+    android:paddingLeft="@dimen/activity_horizontal_margin"
+    android:paddingRight="@dimen/activity_horizontal_margin"
+    android:paddingTop="@dimen/activity_vertical_margin"
+    tools:context="com.soundapp.alisajung.ambientsounds.ManagePlaylistsActivity">
+
+    <ListView
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:id="@+id/listView2"
+        android:layout_alignParentLeft="true"
+        android:layout_alignParentStart="true"
+        android:layout_above="@+id/button2" />
+
+    <Button
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Back"
+        android:id="@+id/button2"
+        android:onClick="backToMainMenu"
+        android:layout_alignTop="@+id/button3"
+        android:layout_alignRight="@+id/listView2"
+        android:layout_alignEnd="@+id/listView2" />
+
+    <Button
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Add List"
+        android:id="@+id/button3"
+        android:onClick="addPlaylist"
+        android:layout_alignParentBottom="true"
+        android:layout_alignParentLeft="true"
+        android:layout_alignParentStart="true" />
+
+</RelativeLayout>

app/src/main/res/layout/activity_playlist_editor.xml

+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:paddingBottom="@dimen/activity_vertical_margin"
+    android:paddingLeft="@dimen/activity_horizontal_margin"
+    android:paddingRight="@dimen/activity_horizontal_margin"
+    android:paddingTop="@dimen/activity_vertical_margin"
+    tools:context="com.soundapp.alisajung.ambientsounds.PlaylistEditor">
+
+    <EditText
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:id="@+id/editText"
+        android:layout_alignParentTop="true"
+        android:layout_alignParentLeft="true"
+        android:layout_alignParentStart="true"
+        android:layout_alignParentRight="true"
+        android:layout_alignParentEnd="true"
+        android:text="Playlist_Name" />
+
+    <ListView
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:id="@+id/medialist1"
+        android:layout_alignParentLeft="true"
+        android:layout_alignParentStart="true"
+        android:layout_below="@+id/editText" />
+
+    <Button
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Done"
+        android:id="@+id/button2"
+        android:layout_alignParentBottom="true"
+        android:layout_alignParentRight="true"
+        android:layout_alignParentEnd="true" />
+
+    <Button
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Delete List"
+        android:id="@+id/button3"
+        android:layout_alignTop="@+id/button2"
+        android:layout_alignParentLeft="true"
+        android:layout_alignParentStart="true" />
+</RelativeLayout>

app/src/main/res/values-v21/styles.xml

+<resources>
+
+    <style name="AppTheme.NoActionBar">
+        <item name="windowActionBar">false</item>
+        <item name="windowNoTitle">true</item>
+        <item name="android:windowDrawsSystemBarBackgrounds">true</item>
+        <item name="android:statusBarColor">@android:color/transparent</item>
+    </style>
+</resources>

app/src/main/res/values/dimens.xml

@@ -2,4 +2,5 @@
     <!-- Default screen margins, per the Android Design guidelines. -->
     <dimen name="activity_horizontal_margin">16dp</dimen>
     <dimen name="activity_vertical_margin">16dp</dimen>
+    <dimen name="fab_margin">16dp</dimen>
 </resources>

app/src/main/res/values/strings.xml

 <resources>
     <string name="app_name">AmbientSounds</string>
+    <string name="title_activity_manage_playlists">ManagePlaylistsActivity</string>
 </resources>

app/src/main/res/values/styles.xml

@@ -8,4 +8,13 @@
         <item name="colorAccent">@color/colorAccent</item>
     </style>
 
+    <style name="AppTheme.NoActionBar">
+        <item name="windowActionBar">false</item>
+        <item name="windowNoTitle">true</item>
+    </style>
+
+    <style name="AppTheme.AppBarOverlay" parent="ThemeOverlay.AppCompat.Dark.ActionBar" />
+
+    <style name="AppTheme.PopupOverlay" parent="ThemeOverlay.AppCompat.Light" />
+
 </resources>