public void testSavedState() throws InterruptedException {
MockLayoutManager mlm = new MockLayoutManager();
mRecyclerView.setLayoutManager(mlm);
mRecyclerView.setAdapter(new MockAdapter(3));
layout();
Parcelable savedState = mRecyclerView.onSaveInstanceState();
// we append a suffix to the parcelable to test out of bounds
String parcelSuffix = UUID.randomUUID().toString();
Parcel parcel = Parcel.obtain();
savedState.writeToParcel(parcel, 0);
parcel.writeString(parcelSuffix);
// reset for reading
parcel.setDataPosition(0);
// re-create
savedState = RecyclerView.SavedState.CREATOR.createFromParcel(parcel);
RecyclerView restored = new RecyclerView(mContext);
MockLayoutManager mlmRestored = new MockLayoutManager();
restored.setLayoutManager(mlmRestored);
restored.setAdapter(new MockAdapter(3));
restored.onRestoreInstanceState(savedState);
assertEquals("Parcel reading should not go out of bounds", parcelSuffix, parcel.readString());
assertEquals("When unmarshalling, all of the parcel should be read", 0, parcel.dataAvail());
assertEquals(
"uuid in layout manager should be preserved properly", mlm.mUuid, mlmRestored.mUuid);
assertNotSame(
"stateless parameter should not be preserved", mlm.mLayoutCount, mlmRestored.mLayoutCount);
layout();
}
public void testSavedStateWithStatelessLayoutManager() throws InterruptedException {
mRecyclerView.setLayoutManager(
new MockLayoutManager() {
@Override
public Parcelable onSaveInstanceState() {
return null;
}
});
mRecyclerView.setAdapter(new MockAdapter(3));
Parcel parcel = Parcel.obtain();
String parcelSuffix = UUID.randomUUID().toString();
Parcelable savedState = mRecyclerView.onSaveInstanceState();
savedState.writeToParcel(parcel, 0);
parcel.writeString(parcelSuffix);
// reset position for reading
parcel.setDataPosition(0);
RecyclerView restored = new RecyclerView(mContext);
restored.setLayoutManager(new MockLayoutManager());
mRecyclerView.setAdapter(new MockAdapter(3));
// restore
savedState = RecyclerView.SavedState.CREATOR.createFromParcel(parcel);
restored.onRestoreInstanceState(savedState);
assertEquals("Parcel reading should not go out of bounds", parcelSuffix, parcel.readString());
assertEquals("When unmarshalling, all of the parcel should be read", 0, parcel.dataAvail());
}
