reduce number of packages in root directory

app/src/main/java/com/dkanada/gramophone/interfaces/base/SimpleAnimatorListener.java

@@ -0,0 +1,21 @@
+package com.dkanada.gramophone.interfaces.base;
+
+import android.animation.Animator;
+
+public abstract class SimpleAnimatorListener implements Animator.AnimatorListener {
+    @Override
+    public void onAnimationStart(Animator animation) {
+    }
+
+    @Override
+    public void onAnimationEnd(Animator animation) {
+    }
+
+    @Override
+    public void onAnimationCancel(Animator animation) {
+    }
+
+    @Override
+    public void onAnimationRepeat(Animator animation) {
+    }
+}

app/src/main/java/com/dkanada/gramophone/interfaces/base/SimpleOnSeekbarChangeListener.java

@@ -0,0 +1,17 @@
+package com.dkanada.gramophone.interfaces.base;
+
+import android.widget.SeekBar;
+
+public abstract class SimpleOnSeekbarChangeListener implements SeekBar.OnSeekBarChangeListener {
+    @Override
+    public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
+    }
+
+    @Override
+    public void onStartTrackingTouch(SeekBar seekBar) {
+    }
+
+    @Override
+    public void onStopTrackingTouch(SeekBar seekBar) {
+    }
+}