move assets, res and java source code to src/main

src/main/java/org/thoughtcrime/securesms/SetStartingPositionLinearLayoutManager.java

@@ -0,0 +1,49 @@
+package org.thoughtcrime.securesms;
+
+import android.content.Context;
+import android.os.Parcelable;
+
+import androidx.recyclerview.widget.LinearLayoutManager;
+import androidx.recyclerview.widget.RecyclerView;
+
+import org.thoughtcrime.securesms.util.ViewUtil;
+
+/**
+ * Like LinearLayoutManager but you can set a starting position
+ */
+class SetStartingPositionLinearLayoutManager extends LinearLayoutManager {
+
+  private int pendingStartingPos = -1;
+
+  SetStartingPositionLinearLayoutManager(Context context, int vertical, boolean b) {
+    super(context, vertical, b);
+  }
+
+  @Override
+  public void onLayoutChildren(RecyclerView.Recycler recycler, RecyclerView.State state) {
+    if (pendingStartingPos != -1 && state.getItemCount() > 0) {
+      // scrollToPositionWithOffset(mPendingTargetPos, 0) would also do the job but the target item
+      // would be at the bottom of the screen, not at the top
+      int position = pendingStartingPos + 1;
+      if (position < state.getItemCount()) {
+        scrollToPositionWithOffset(pendingStartingPos + 1, getHeight() - ViewUtil.dpToPx(10));
+      } else {
+        // pendingTargetPos is the top-most item
+        scrollToPosition(pendingStartingPos);
+      }
+      pendingStartingPos = -1;
+    }
+
+    super.onLayoutChildren(recycler, state);
+  }
+
+  @Override
+  public void onRestoreInstanceState(Parcelable state) {
+    pendingStartingPos = -1;
+    super.onRestoreInstanceState(state);
+  }
+
+  public void setStartingPosition(int position) {
+    pendingStartingPos = position;
+  }
+}