Fix rendering after deleting playlist items

Fixes daneren2005#910

Author: vrih

Diff for: app/src/androidTest/java/github/daneren2005/dsub/adapter/EntryGridAdapterTest.java

@@ -0,0 +1,44 @@
+package github.daneren2005.dsub.adapter;
+
+
+import android.content.Context;
+import android.test.AndroidTestCase;
+import android.test.mock.MockContext;
+import android.util.Log;
+import android.view.View;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+import github.daneren2005.dsub.domain.MusicDirectory.Entry;
+
+
+public class EntryGridAdapterTest extends AndroidTestCase {
+	private EntryGridAdapter mAdapter;
+
+
+	public EntryGridAdapterTest() {
+		super();
+	}
+
+	protected void setUp() throws Exception {
+		super.setUp();
+	}
+
+	public void testRemoveAt() {
+		Entry a = new Entry("a");
+		Entry c = new Entry("c");
+
+		List<Entry> section = new ArrayList<>(Arrays.asList(
+				a,
+				new Entry("b"),
+				c,
+				new Entry("d"),
+				new Entry("e")));
+		mAdapter = new EntryGridAdapter(null, section, null, false);
+
+		mAdapter.removeAt(Arrays.asList(1, 3, 4));
+		assertEquals(new ArrayList<>(Arrays.asList(a, c)), section);
+	}
+}

Diff for: app/src/main/java/github/daneren2005/dsub/adapter/EntryGridAdapter.java

@@ -22,6 +22,7 @@
 import android.view.View;
 import android.view.ViewGroup;
 
+import java.util.Iterator;
 import java.util.List;
 
 import github.daneren2005.dsub.R;
@@ -129,12 +130,20 @@ public void setShowAlbum(boolean showAlbum) {
 		this.showAlbum = showAlbum;
 	}
 
-	public void removeAt(int index) {
-		sections.get(0).remove(index);
-		if(header != null) {
+	public void removeAt(List<Integer> indices) {
+		List<Entry> section = sections.get(0);
+
+		Iterator iter = section.iterator();
+		int index = 0;
+
+		while (iter.hasNext()) {
+			iter.next();
+			if (indices.contains(index)){
+				iter.remove();
+			}
 			index++;
 		}
-		notifyItemRemoved(index);
+		notifyDataSetChanged();
 	}
 
 	public void setRemoveFromPlaylist(boolean removeFromPlaylist) {

Diff for: app/src/main/java/github/daneren2005/dsub/fragments/SelectDirectoryFragment.java

@@ -917,9 +917,7 @@ protected Void doInBackground() throws Throwable {
 
 			@Override
 			protected void done(Void result) {
-				for(Integer index: indexes) {
-					entryGridAdapter.removeAt(index);
-				}
+				entryGridAdapter.removeAt(indexes);
 				Util.toast(context, context.getResources().getString(R.string.removed_playlist, String.valueOf(indexes.size()), name));
 			}