Added rename dialog

app/src/main/java/max/music_cyclon/RenameDialogFragment.java

@@ -0,0 +1,55 @@
+package max.music_cyclon;
+
+
+import android.app.Dialog;
+import android.content.Context;
+import android.content.DialogInterface;
+import android.os.Bundle;
+import android.support.annotation.NonNull;
+import android.support.v4.app.DialogFragment;
+import android.support.v7.app.AlertDialog;
+import android.widget.EditText;
+
+public class RenameDialogFragment extends DialogFragment {
+
+    public static final DialogInterface.OnClickListener STUB_CLICK = new DialogInterface.OnClickListener() {
+        public void onClick(DialogInterface dialog, int id) {
+        }
+    };
+
+    private PagerAdapter adapter;
+    private String previousName;
+
+    public void setAdapter(PagerAdapter adapter) {
+        this.adapter = adapter;
+    }
+
+    public void setPreviousName(String previousName) {
+        this.previousName = previousName;
+    }
+
+    private EditText newName;
+
+
+    @NonNull
+    @Override
+    public Dialog onCreateDialog(Bundle savedInstanceState) {
+        newName = new EditText(getActivity());
+
+        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity())
+                .setTitle("Rename")
+                .setView(newName)
+                .setPositiveButton(android.R.string.ok, new ApplyRename())
+                .setNegativeButton(android.R.string.cancel, STUB_CLICK);
+
+        return builder.create();
+    }
+
+    private class ApplyRename implements DialogInterface.OnClickListener {
+        @Override
+        public void onClick(DialogInterface dialog, int which) {
+            adapter.rename(previousName, newName.getText().toString());
+            adapter.notifyDataSetChanged();
+        }
+    }
+}