Java tutorial
/* * Copyright (C) 2016. BoBoMEe(wbwjx115@gmail.com) * * 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. */ package com.bobomee.android.recyclerviewhelper.fastscroll; import android.animation.ObjectAnimator; import android.content.Context; import android.graphics.drawable.GradientDrawable; import android.graphics.drawable.StateListDrawable; import android.support.annotation.NonNull; import android.support.v4.view.ViewCompat; import android.util.AttributeSet; import android.view.LayoutInflater; import android.view.MotionEvent; import android.view.View; import android.widget.FrameLayout; import android.widget.ImageView; import android.widget.TextView; import com.bobomee.android.recyclerviewhelper.R; import com.bobomee.android.recyclerviewhelper.fastscroll.interfaces.BubbleTextCreator; import com.bobomee.android.recyclerviewhelper.fastscroll.interfaces.OnScrollStateChange; import com.bobomee.android.recyclerviewhelper.fastscroll.util.AnimatorUtil; import com.bobomee.android.recyclerviewhelper.fastscroll.util.GradientDrawableHelper; import com.bobomee.android.recyclerviewhelper.fastscroll.util.StateListDrawableHelper; import static com.bobomee.android.recyclerviewhelper.fastscroll.Utils.getValueInRange; import static com.bobomee.android.recyclerviewhelper.fastscroll.Utils.setTextBackground; /** * Class taken from GitHub, customized and optimized for FlexibleAdapter project. * * @see <a href="https://github.com/AndroidDeveloperLB/LollipopContactsRecyclerViewFastScroller"> * github.com/AndroidDeveloperLB/LollipopContactsRecyclerViewFastScroller</a> * @since Up to the date 23/01/2016 * <br/>23/01/2016 Added onFastScrollerStateChange in the listener */ public class FastScroller extends FrameLayout { protected TextView bubble; protected ImageView handle; protected int height; private boolean isInitialized = false; private ObjectAnimator currentAnimator; private BubbleTextCreator bubbleTextCreator; private OnScrollStateChange mOnScrollStateChange; public FastScroller(Context context) { this(context, null); } public FastScroller(Context context, AttributeSet attrs) { this(context, attrs, 0); } public FastScroller(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); init(); } protected void init() { if (isInitialized) return; isInitialized = true; setClipChildren(false); mOnScrollStateChange = new OnScrollStateChange(); } public void setBubbleTextCreator(BubbleTextCreator _bubbleTextCreator) { bubbleTextCreator = _bubbleTextCreator; } public void addOnScrollStateChangeListener( OnScrollStateChange.OnScrollStateChangeListener _onScrollStateChangeListener) { mOnScrollStateChange.addListener(_onScrollStateChangeListener); } @Override protected void onFinishInflate() { super.onFinishInflate(); if (!isInEditMode()) { if (bubble != null) return;//Already inflated LayoutInflater inflater = LayoutInflater.from(getContext()); inflater.inflate(R.layout.library_fast_scroller_layout, this, true); bubble = (TextView) findViewById(R.id.fast_scroller_bubble); if (bubble != null) bubble.setVisibility(INVISIBLE); handle = (ImageView) findViewById(R.id.fast_scroller_handle); } } /** * Layout customization<br/> * Color for Selected State is also customized by the user. * * @param accentColor Color for Selected state during touch and scrolling (usually accent color) */ public void setAccentColor(int accentColor) { setBubbleAndHandleColor(accentColor); } private void setBubbleAndHandleColor(int accentColor) { //BubbleDrawable accentColor GradientDrawable bubbleDrawable = GradientDrawableHelper.getGradientDrawable(getContext(), R.drawable.fast_scroller_bubble); assert bubbleDrawable != null; bubbleDrawable.setColor(accentColor); setTextBackground(bubble, bubbleDrawable); //HandleDrawable accentColor StateListDrawable stateListDrawable = StateListDrawableHelper.getStateListDrawable(getContext(), R.drawable.fast_scroller_handle); GradientDrawable handleDrawable = (GradientDrawable) StateListDrawableHelper .getStateDrawable(stateListDrawable, 0); assert handleDrawable != null; handleDrawable.setColor(accentColor); handle.setImageDrawable(stateListDrawable); } @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { super.onSizeChanged(w, h, oldw, oldh); height = h; } @Override public boolean onTouchEvent(@NonNull MotionEvent event) { int action = event.getAction(); switch (action) { case MotionEvent.ACTION_DOWN: if (event.getX() < handle.getX() - ViewCompat.getPaddingStart(handle)) return false; if (currentAnimator != null) currentAnimator.cancel(); handle.setSelected(true); mOnScrollStateChange.onFastScrollerStateChange(true); showBubble(); case MotionEvent.ACTION_MOVE: float y = event.getY(); setBubbleAndHandlePosition(y); onScrollPosition(y); return true; case MotionEvent.ACTION_UP: case MotionEvent.ACTION_CANCEL: handle.setSelected(false); mOnScrollStateChange.onFastScrollerStateChange(false); hideBubble(); return true; } return super.onTouchEvent(event); } public void onScrollPosition(float _y) { } protected void setBubbleText(int _targetPos) { if (bubble != null) { String bubbleText = bubbleTextCreator.onCreateBubbleText(_targetPos); if (bubbleText != null) { bubble.setVisibility(View.VISIBLE); bubble.setText(bubbleText); } else { bubble.setVisibility(View.GONE); } } } protected void setBubbleAndHandlePosition(float y) { int handleHeight = handle.getHeight(); handle.setY(getValueInRange(0, height - handleHeight, (int) (y - handleHeight / 2))); if (bubble != null) { int bubbleHeight = bubble.getHeight(); bubble.setY(getValueInRange(0, height - bubbleHeight - handleHeight / 2, (int) (y - bubbleHeight))); } } private void showBubble() { if (currentAnimator != null) currentAnimator.cancel(); currentAnimator = AnimatorUtil.to_alpha(bubble); } private void hideBubble() { if (null != currentAnimator) currentAnimator.cancel(); currentAnimator = AnimatorUtil.alpha_to(bubble); } }