Java tutorial
/* * Copyright (C) 2013 Andreas Stuetz <andreas.stuetz@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.wlzndjk.poker.widget; import java.util.ArrayList; import java.util.List; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.os.Parcel; import android.os.Parcelable; import android.support.v4.view.ViewPager; import android.support.v4.view.ViewPager.OnPageChangeListener; import android.util.AttributeSet; import android.view.View; import android.view.ViewTreeObserver.OnGlobalLayoutListener; import android.widget.HorizontalScrollView; import android.widget.ImageButton; import android.widget.ImageView; import android.widget.LinearLayout; import com.wlzndjk.poker.R; import com.wlzndjk.poker.common.MyApplication; import com.wlzndjk.poker.utils.AndroidUtils; /** * ????? * * @author heshicaihao */ public class MyHScrollView extends HorizontalScrollView { private float currentPositionOffset = 0f; private int tabCount; private int currentPosition = 0; private int scrollOffset = 54; private int selectedPosition = 0; private int lastScrollX = 0; private int tabWidth = AndroidUtils.dip2px(MyApplication.getContext(), 50); private int tabHeight = AndroidUtils.dip2px(MyApplication.getContext(), 77); private int tabMargins = AndroidUtils.dip2px(MyApplication.getContext(), 4); private String tabBackgroundColor = "#90dfdb"; private String tabselectedBackgroundColor = "#f3f2ee"; private List<Integer> tabDatas = new ArrayList<Integer>(); private LinearLayout tabsContainer; private ViewPager viewPager; private final PageListener pageListener = new PageListener(); private final RightListener rightListener = new RightListener(); private final LeftListener leftListener = new LeftListener(); public OnPageChangeListener delegatePageListener; private ImageView mLeft; private ImageView mRight; public MyHScrollView(Context context) { this(context, null); } public MyHScrollView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public MyHScrollView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); // ACache mCache = ACache.get(MyApplication.getContext()); // String asString = mCache.getAsString(MyConstants.SCREENWIDTH); // int screenwidth = Integer.parseInt(asString); // tabWidth = (screenwidth - tabMargins * 2 * 6 - (int) (2 * 30 * screenDensity)) / 6; setFillViewport(true); setWillNotDraw(false); tabsContainer = new LinearLayout(context); tabsContainer.setOrientation(LinearLayout.HORIZONTAL); tabsContainer.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT)); addView(tabsContainer); } public void setViewPager(ViewPager pager, ImageView leftBtn, ImageView rightBtn, List<Integer> datas) { this.viewPager = pager; this.tabDatas = datas; this.mLeft = leftBtn; this.mRight = rightBtn; if (pager.getAdapter() == null) { throw new IllegalStateException("ViewPager does not have adapter instance."); } pager.setOnPageChangeListener(pageListener); rightBtn.setOnClickListener(rightListener); leftBtn.setOnClickListener(leftListener); notifyDataSetChanged(); } // public void setViewPager(ViewPager pager, List<Integer> datas) { // this.viewPager = pager; // this.tabDatas = datas; // if (pager.getAdapter() == null) { // throw new IllegalStateException( // "ViewPager does not have adapter instance."); // } // pager.setOnPageChangeListener(pageListener); // notifyDataSetChanged(); // } public void setOnPageChangeListener(OnPageChangeListener listener) { this.delegatePageListener = listener; } public void notifyDataSetChanged() { tabsContainer.removeAllViews(); tabCount = viewPager.getAdapter().getCount(); for (int i = 0; i < tabCount; i++) { if (viewPager.getAdapter() instanceof IconTabProvider) { addIconTab(i, ((IconTabProvider) viewPager.getAdapter()).getPageIconResId(i)); } else { addImageTab(i, viewPager.getAdapter().getPageTitle(i).toString()); } } updateTabStyles(); getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() { @SuppressWarnings("deprecation") @Override public void onGlobalLayout() { getViewTreeObserver().removeGlobalOnLayoutListener(this); currentPosition = viewPager.getCurrentItem(); scrollToChild(currentPosition, 0); } }); } private void addImageTab(final int position, String title) { ImageView tab = new ImageView(getContext()); tab.setImageResource(tabDatas.get(position)); tab.setScaleType(ImageView.ScaleType.FIT_XY); addTab(position, tab); } private void addIconTab(final int position, int resId) { ImageButton tab = new ImageButton(getContext()); tab.setImageResource(resId); addTab(position, tab); } private void addTab(final int position, View tab) { tab.setFocusable(true); tab.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { viewPager.setCurrentItem(position); } }); tab.setPadding(tabMargins, tabMargins, tabMargins, tabMargins); LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(tabWidth, tabHeight); tabsContainer.addView(tab, position, lp); } private void updateTabStyles() { for (int i = 0; i < tabCount; i++) { View v = tabsContainer.getChildAt(i); if (v instanceof ImageView) { ImageView tab = (ImageView) v; if (i == selectedPosition) { tab.setBackgroundColor(Color.parseColor(tabBackgroundColor)); if (selectedPosition == 0) { mLeft.setImageResource(R.drawable.left_normal); mRight.setImageResource(R.drawable.right_pressed); } else if (selectedPosition == tabCount - 1) { mLeft.setImageResource(R.drawable.left_pressed); mRight.setImageResource(R.drawable.right_normal); } else { mLeft.setImageResource(R.drawable.left_pressed); mRight.setImageResource(R.drawable.right_pressed); } } else { tab.setBackgroundColor(Color.parseColor(tabselectedBackgroundColor)); } } } } private void scrollToChild(int position, int offset) { if (tabCount == 0) { return; } int newScrollX = tabsContainer.getChildAt(position).getLeft() + offset; if (position > 0 || offset > 0) { newScrollX -= scrollOffset; } if (newScrollX != lastScrollX) { lastScrollX = newScrollX; scrollTo(newScrollX, 0); } } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); if (isInEditMode() || tabCount == 0) { return; } // default: line below current tab View currentTab = tabsContainer.getChildAt(currentPosition); float lineLeft = currentTab.getLeft(); float lineRight = currentTab.getRight(); // if there is an offset, start interpolating left and right coordinates // between current and next tab if (currentPositionOffset > 0f && currentPosition < tabCount - 1) { View nextTab = tabsContainer.getChildAt(currentPosition + 1); final float nextTabLeft = nextTab.getLeft(); final float nextTabRight = nextTab.getRight(); lineLeft = (currentPositionOffset * nextTabLeft + (1f - currentPositionOffset) * lineLeft); lineRight = (currentPositionOffset * nextTabRight + (1f - currentPositionOffset) * lineRight); } } private class RightListener implements OnClickListener { @Override public void onClick(View v) { int mNextItem = viewPager.getCurrentItem() < tabCount ? (viewPager.getCurrentItem() + 1) : viewPager.getCurrentItem(); viewPager.setCurrentItem(mNextItem, true); } } private class LeftListener implements OnClickListener { @Override public void onClick(View v) { int mNextItem = viewPager.getCurrentItem() > 0 ? (viewPager.getCurrentItem() - 1) : viewPager.getCurrentItem(); viewPager.setCurrentItem(mNextItem, true); } } private class PageListener implements OnPageChangeListener { @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { currentPosition = position; currentPositionOffset = positionOffset; scrollToChild(position, (int) (positionOffset * tabsContainer.getChildAt(position).getWidth())); invalidate(); if (delegatePageListener != null) { delegatePageListener.onPageScrolled(position, positionOffset, positionOffsetPixels); } } @Override public void onPageScrollStateChanged(int state) { if (state == ViewPager.SCROLL_STATE_IDLE) { scrollToChild(viewPager.getCurrentItem(), 0); } if (delegatePageListener != null) { delegatePageListener.onPageScrollStateChanged(state); } } @Override public void onPageSelected(int position) { selectedPosition = position; updateTabStyles(); if (delegatePageListener != null) { delegatePageListener.onPageSelected(position); } } } @Override public void onRestoreInstanceState(Parcelable state) { SavedState savedState = (SavedState) state; super.onRestoreInstanceState(savedState.getSuperState()); currentPosition = savedState.currentPosition; requestLayout(); } @Override public Parcelable onSaveInstanceState() { Parcelable superState = super.onSaveInstanceState(); SavedState savedState = new SavedState(superState); savedState.currentPosition = currentPosition; return savedState; } static class SavedState extends BaseSavedState { int currentPosition; public SavedState(Parcelable superState) { super(superState); } private SavedState(Parcel in) { super(in); currentPosition = in.readInt(); } @Override public void writeToParcel(Parcel dest, int flags) { super.writeToParcel(dest, flags); dest.writeInt(currentPosition); } public static final Parcelable.Creator<SavedState> CREATOR = new Parcelable.Creator<SavedState>() { @Override public SavedState createFromParcel(Parcel in) { return new SavedState(in); } @Override public SavedState[] newArray(int size) { return new SavedState[size]; } }; } public interface IconTabProvider { public int getPageIconResId(int position); } }