Made some progress with the new playing screen. Still WIP, very unstable and many things not working. Better don't mess with the current code.

app/src/main/java/com/kabouzeid/gramophone/views/SquareLayout.java

@@ -0,0 +1,43 @@
+package com.kabouzeid.gramophone.views;
+
+import android.annotation.TargetApi;
+import android.content.Context;
+import android.os.Build;
+import android.util.AttributeSet;
+import android.widget.FrameLayout;
+
+/**
+ * @author Karim Abou Zeid (kabouzeid)
+ */
+public class SquareLayout extends FrameLayout {
+
+    private boolean forceSquare = true;
+
+    public SquareLayout(Context context) {
+        super(context);
+    }
+
+    public SquareLayout(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    public SquareLayout(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+    }
+
+    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
+    public SquareLayout(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
+        super(context, attrs, defStyleAttr, defStyleRes);
+    }
+
+    @Override
+    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        //noinspection SuspiciousNameCombination
+        super.onMeasure(widthMeasureSpec, forceSquare ? widthMeasureSpec : heightMeasureSpec);
+    }
+
+    public void forceSquare(boolean forceSquare) {
+        this.forceSquare = forceSquare;
+        requestLayout();
+    }
+}