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codlab/Implementation

Created April 22, 2016 14:42
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  1. codlab created this gist Apr 22, 2016.
    95 changes: 95 additions & 0 deletions Implementation
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    Original file line number Diff line number Diff line change
    @@ -0,0 +1,95 @@
    # Activity declaration

    public class MainActivity extends AppCompatActivity
    implements AppBarLayout.OnOffsetChangedListener

    //int the onCreate
    AppBarLayout.LayoutParams params = (AppBarLayout.LayoutParams) mCollapsingToolbar.getLayoutParams();
    mDefaultFlags = params.getScrollFlags();
    mSetSnapAfter0 = false; //set snap after event in the offsetchanged


    #OnOffsetChangedListener implementation

    @Override
    public void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset) {
    FragmentDescriptor fragments = FragmentDescriptor.from(sBackstackController.getHead());

    if (mSetSnapAfter0 && verticalOffset == 0) {
    AppBarLayout.LayoutParams params = (AppBarLayout.LayoutParams) mCollapsingToolbar.getLayoutParams();
    mSetSnapAfter0 = false;
    params.setScrollFlags(AppBarLayout.LayoutParams.SCROLL_FLAG_SNAP); // list other flags here by |
    mCollapsingToolbar.setLayoutParams(params);
    }
    }


    #The method to update the toolbar behaviour

    //called whenever the toolbar behaviour must be changed : fragment transition, etc...
    @UiThread
    private void updateCollapsing() {
    AppBarLayout.LayoutParams params = (AppBarLayout.LayoutParams) mCollapsingToolbar.getLayoutParams();
    FragmentDescriptor frag = FragmentDescriptor.from(sBackstackController.getHead());
    ToolbarType type = frag.getToolbarType();

    mNewState = type;
    if (mSetCanExpandCollapse != null && mSetCanExpandCollapse) {
    params.setScrollFlags(mDefaultFlags); //set default
    } else if ((mSetCanExpandCollapse != null && !mSetCanExpandCollapse)
    || ToolbarType.EXPANDED.equals(type)) { //COLLAPSED FOR NOW
    if (!ToolbarType.COLLAPSED.equals(type)) {
    mAppBar.setExpanded(true, true); //set co
    mSetSnapAfter0 = true;
    } //managed right after
    } else {
    params.setScrollFlags(mDefaultFlags);
    }

    //force collapse mode since snap and collapse will not work
    if (ToolbarType.COLLAPSED.equals(type)) {
    mAppBar.setExpanded(false, true);
    mAppBar.setActivated(false);
    mCoordinatorLayout.setAllowForScroll(false);
    mCollapsingToolbar.setActivated(false);
    mCollapsingToolbar.setLayoutParams(params);
    } else {
    mAppBar.setActivated(true);
    mCollapsingToolbar.setActivated(true);
    mCoordinatorLayout.setAllowForScroll(true);
    mCollapsingToolbar.setLayoutParams(params);
    }
    }


    # Describe the Toolbar current mode

    public enum ToolbarType {
    NONE,
    EXPANDABLE,
    EXPANDED,
    COLLAPSED
    }


    # The FragmentDescriptor enum implementation

    public enum FragmentDescriptor {
    ....;



    FragmentDescriptor(boolean backable, //well add < in the main activity
    ToolbarType toolbar_scrollable,
    ...) {
    }


    public boolean isBackable() {
    return mBackable;
    }

    public ToolbarType getToolbarType() {
    return mToolbarScrollable;
    }
    }