Forked from marcelpinto/ControllableAppBarLayout.java
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An extension of Android AppBarLayout, that allows to programatically change the CollapsibleToolbarLayout state and receive state changes (collapsed, expanded and idle)
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| package com.eatfirst.android.ui.custom; | |
| /** | |
| * Copyright 2015 Bartosz Lipinski | |
| * | |
| * Licensed under the Apache License, Version 2.0 (the "License"); | |
| * you may not use this file except in compliance with the License. | |
| * You may obtain a copy of the License at | |
| * | |
| * http://www.apache.org/licenses/LICENSE-2.0 | |
| * | |
| * Unless required by applicable law or agreed to in writing, software | |
| * distributed under the License is distributed on an "AS IS" BASIS, | |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| * See the License for the specific language governing permissions and | |
| * limitations under the License. | |
| */ | |
| import android.content.Context; | |
| import android.graphics.Canvas; | |
| import android.os.Handler; | |
| import android.support.design.widget.AppBarLayout; | |
| import android.support.design.widget.CoordinatorLayout; | |
| import android.util.AttributeSet; | |
| import java.lang.ref.WeakReference; | |
| public class ControllableAppBarLayout extends AppBarLayout | |
| implements AppBarLayout.OnOffsetChangedListener { | |
| private AppBarLayout.Behavior mBehavior; | |
| private WeakReference<CoordinatorLayout> mParent; | |
| private ToolbarChange mQueuedChange = ToolbarChange.NONE; | |
| private boolean mAfterFirstDraw = false; | |
| private State state; | |
| private OnStateChangeListener onStateChangeListener; | |
| private final Handler handler = new Handler(); | |
| public ControllableAppBarLayout(Context context) { | |
| super(context); | |
| } | |
| public ControllableAppBarLayout(Context context, AttributeSet attrs) { | |
| super(context, attrs); | |
| } | |
| @Override | |
| protected void onAttachedToWindow() { | |
| super.onAttachedToWindow(); | |
| if (!(getLayoutParams() instanceof CoordinatorLayout.LayoutParams) | |
| || !(getParent() instanceof CoordinatorLayout)) { | |
| throw new IllegalStateException( | |
| "ControllableAppBarLayout must be a direct child of CoordinatorLayout."); | |
| } | |
| mParent = new WeakReference<CoordinatorLayout>((CoordinatorLayout) getParent()); | |
| addOnOffsetChangedListener(this); | |
| } | |
| @Override | |
| protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { | |
| super.onMeasure(widthMeasureSpec, heightMeasureSpec); | |
| if (mBehavior == null) { | |
| mBehavior = (Behavior) ((CoordinatorLayout.LayoutParams) getLayoutParams()).getBehavior(); | |
| } | |
| } | |
| @Override | |
| protected void onLayout(boolean changed, int l, int t, int r, int b) { | |
| super.onLayout(changed, l, t, r, b); | |
| if (r - l > 0 && b - t > 0 && mAfterFirstDraw && mQueuedChange != ToolbarChange.NONE) { | |
| analyzeQueuedChange(); | |
| } | |
| } | |
| @Override | |
| protected void onDraw(Canvas canvas) { | |
| super.onDraw(canvas); | |
| if (!mAfterFirstDraw) { | |
| mAfterFirstDraw = true; | |
| if (mQueuedChange != ToolbarChange.NONE) { | |
| analyzeQueuedChange(); | |
| } | |
| } | |
| } | |
| private synchronized void analyzeQueuedChange() { | |
| switch (mQueuedChange) { | |
| case COLLAPSE: | |
| performCollapsingWithoutAnimation(); | |
| break; | |
| case COLLAPSE_WITH_ANIMATION: | |
| performCollapsingWithAnimation(); | |
| break; | |
| case EXPAND: | |
| performExpandingWithoutAnimation(); | |
| break; | |
| case EXPAND_WITH_ANIMATION: | |
| performExpandingWithAnimation(); | |
| break; | |
| } | |
| mQueuedChange = ToolbarChange.NONE; | |
| } | |
| public void collapseToolbar() { | |
| collapseToolbar(false); | |
| } | |
| public void collapseToolbar(boolean withAnimation) { | |
| mQueuedChange = withAnimation ? ToolbarChange.COLLAPSE_WITH_ANIMATION : ToolbarChange.COLLAPSE; | |
| requestLayout(); | |
| } | |
| public void expandToolbar() { | |
| expandToolbar(false); | |
| } | |
| public void expandToolbar(boolean withAnimation) { | |
| mQueuedChange = withAnimation ? ToolbarChange.EXPAND_WITH_ANIMATION : ToolbarChange.EXPAND; | |
| requestLayout(); | |
| } | |
| private void performCollapsingWithoutAnimation() { | |
| if (mParent.get() != null) { | |
| mBehavior.onNestedPreScroll(mParent.get(), this, null, 0, getHeight(), new int[] { 0, 0 }); | |
| } | |
| } | |
| private void performCollapsingWithAnimation() { | |
| if (mParent.get() != null) { | |
| mBehavior.onNestedFling(mParent.get(), this, null, 0, getHeight(), true); | |
| } | |
| } | |
| private void performExpandingWithoutAnimation() { | |
| if (mParent.get() != null) { | |
| mBehavior.setTopAndBottomOffset(0); | |
| } | |
| } | |
| private void performExpandingWithAnimation() { | |
| if (mParent.get() != null) { | |
| mBehavior.onNestedFling(mParent.get(), this, null, 0, -getHeight() * 5, false); | |
| } | |
| } | |
| @Override | |
| public void onOffsetChanged(final AppBarLayout appBarLayout, final int i) { | |
| if (i == 0) { | |
| if (onStateChangeListener != null && state != State.EXPANDED) { | |
| onStateChangeListener.onStateChange(State.EXPANDED); | |
| } | |
| handler.removeCallbacksAndMessages(null); | |
| state = State.EXPANDED; | |
| } else if (Math.abs(i) >= appBarLayout.getTotalScrollRange()) { | |
| if (onStateChangeListener != null && state != State.COLLAPSED) { | |
| onStateChangeListener.onStateChange(State.COLLAPSED); | |
| } | |
| handler.removeCallbacksAndMessages(null); | |
| state = State.COLLAPSED; | |
| } else { | |
| if (onStateChangeListener != null && state != State.IDLE) { | |
| onStateChangeListener.onStateChange(State.IDLE); | |
| } | |
| final Runnable runnable = new Runnable() { | |
| @Override | |
| public void run() { | |
| if (Math.abs(i) > appBarLayout.getTotalScrollRange() / 2) { | |
| collapseToolbar(true); | |
| } else { | |
| expandToolbar(true); | |
| } | |
| } | |
| }; | |
| handler.removeCallbacksAndMessages(null); | |
| handler.postDelayed(runnable, 500); | |
| state = State.IDLE; | |
| } | |
| } | |
| public void setOnStateChangeListener(OnStateChangeListener listener) { | |
| this.onStateChangeListener = listener; | |
| } | |
| public State getState() { | |
| return state; | |
| } | |
| public interface OnStateChangeListener { | |
| void onStateChange(State toolbarChange); | |
| } | |
| public enum State { | |
| COLLAPSED, | |
| EXPANDED, | |
| IDLE | |
| } | |
| private enum ToolbarChange { | |
| COLLAPSE, | |
| COLLAPSE_WITH_ANIMATION, | |
| EXPAND, | |
| EXPAND_WITH_ANIMATION, | |
| NONE | |
| } | |
| } |
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Forked from: https://gist.github.com/skimarxall/863585dcd7abde8f4153
If the AppBarLayout is more then half collapsed after a 0.5s delay, it will animate collapse, otherwise it will animate expand.