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.netease.nim.chatroom.demo.im.ui.tab; import android.annotation.SuppressLint; import android.content.Context; import android.content.res.Resources; import android.content.res.TypedArray; import android.graphics.Canvas; import android.graphics.Paint; import android.graphics.Paint.Style; import android.os.Build; 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.util.DisplayMetrics; import android.util.TypedValue; import android.view.GestureDetector; import android.view.LayoutInflater; import android.view.MotionEvent; import android.view.View; import android.view.ViewTreeObserver.OnGlobalLayoutListener; import android.widget.HorizontalScrollView; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.TextView; import com.netease.nim.chatroom.demo.R; import com.netease.nim.chatroom.demo.base.util.ScreenUtil; import com.netease.nim.chatroom.demo.im.ui.tab.reminder.ReminderItem; import java.util.Locale; public class PagerSlidingTabStrip extends HorizontalScrollView implements OnPageChangeListener { // @formatter:off private static final int[] ATTRS = new int[] { android.R.attr.textSize, android.R.attr.textColor }; // @formatter:on private LinearLayout.LayoutParams tabViewLayoutParams; private LinearLayout tabsContainer; private ViewPager pager; private int tabCount; private int currentPosition = 0; public int getCurrentPosition() { return currentPosition; } private float currentPositionOffset = 0f; private Paint rectPaint; private Paint dividerPaint; private int indicatorColor = 0xFF0888ff; private int underlineColor = getResources().getColor(R.color.color_gray_d9d9d9);// 0xFFD9D9D9; private int dividerColor = 0x00000000; private int checkedTextColor = R.color.color_blue_0888ff; private int unCheckedTextColor = R.color.action_bar_tittle_color_555555; private boolean textAllCaps = true; private int scrollOffset = 52; private int indicatorHeight = 3; private int underlineHeight = 2; private int dividerPadding = 12; private int tabPadding = 0; private int dividerWidth = 1; private int lastScrollX = 0; private Locale locale; private OnTabClickListener onTabClickListener = null; private OnTabDoubleTapListener onTabDoubleTapListener = null; private OnCustomTabListener onCustomTabListener = null; public PagerSlidingTabStrip(Context context) { this(context, null); } public PagerSlidingTabStrip(Context context, AttributeSet attrs) { this(context, attrs, 0); } public PagerSlidingTabStrip(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); setFillViewport(true); setWillNotDraw(false); tabsContainer = new LinearLayout(context); tabsContainer.setOrientation(LinearLayout.HORIZONTAL); tabsContainer.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT)); addView(tabsContainer); DisplayMetrics dm = getResources().getDisplayMetrics(); scrollOffset = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, scrollOffset, dm); indicatorHeight = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, indicatorHeight, dm); underlineHeight = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_PX, underlineHeight, dm); dividerPadding = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dividerPadding, dm); tabPadding = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, tabPadding, dm); dividerWidth = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dividerWidth, dm); // get system attrs (android:textSize and android:textColor) TypedArray a = context.obtainStyledAttributes(attrs, ATTRS); a.recycle(); // get custom attrs a = context.obtainStyledAttributes(attrs, R.styleable.PagerSlidingTabStrip); indicatorColor = a.getColor(R.styleable.PagerSlidingTabStrip_pstsIndicatorColor, indicatorColor); underlineColor = a.getColor(R.styleable.PagerSlidingTabStrip_pstsUnderlineColor, underlineColor); dividerColor = a.getColor(R.styleable.PagerSlidingTabStrip_pstsDividerColor, dividerColor); checkedTextColor = a.getResourceId(R.styleable.TwoTextView_ttLeftTextColor, R.color.color_blue_0888ff); unCheckedTextColor = a.getResourceId(R.styleable.TwoTextView_ttLeftTextColor, R.color.action_bar_tittle_color_555555); indicatorHeight = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsIndicatorHeight, indicatorHeight); underlineHeight = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsUnderlineHeight, underlineHeight); dividerPadding = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsDividerPadding, dividerPadding); tabPadding = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsTabPaddingLeftRight, tabPadding); scrollOffset = a.getDimensionPixelSize(R.styleable.PagerSlidingTabStrip_pstsScrollOffset, scrollOffset); textAllCaps = a.getBoolean(R.styleable.PagerSlidingTabStrip_pstsTextAllCaps, textAllCaps); a.recycle(); rectPaint = new Paint(); rectPaint.setAntiAlias(true); rectPaint.setStyle(Style.FILL); dividerPaint = new Paint(); dividerPaint.setAntiAlias(true); dividerPaint.setStrokeWidth(dividerWidth); tabViewLayoutParams = new LinearLayout.LayoutParams(0, LayoutParams.MATCH_PARENT, 1.0f); if (locale == null) { locale = getResources().getConfiguration().locale; } } // // OnPageChangeListener // @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { currentPosition = position; currentPositionOffset = positionOffset; scrollToChild(position, (int) (positionOffset * tabsContainer.getChildAt(position).getWidth())); invalidate(); } @Override public void onPageScrollStateChanged(int state) { if (state == ViewPager.SCROLL_STATE_IDLE) { scrollToChild(pager.getCurrentItem(), 0); } } @Override public void onPageSelected(int position) { setChooseTabViewTextColor(position); } // // OnPageChangeListener // public void setViewPager(ViewPager pager) { this.pager = pager; if (pager.getAdapter() == null) { throw new IllegalStateException("ViewPager does not have adapter instance."); } notifyDataSetChanged(); } public void notifyDataSetChanged() { tabsContainer.removeAllViews(); tabCount = pager.getAdapter().getCount(); for (int i = 0; i < tabCount; i++) { addTabView(i, pager.getAdapter().getPageTitle(i).toString()); } // updateTabStyles(); getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() { @SuppressWarnings("deprecation") @SuppressLint("NewApi") @Override public void onGlobalLayout() { if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN) { getViewTreeObserver().removeGlobalOnLayoutListener(this); } else { getViewTreeObserver().removeOnGlobalLayoutListener(this); } currentPosition = pager.getCurrentItem(); setChooseTabViewTextColor(currentPosition); scrollToChild(currentPosition, 0); } }); } private void setChooseTabViewTextColor(int position) { int childCount = tabsContainer.getChildCount(); LinearLayout tabView; TextView textView; for (int i = 0; i < childCount; ++i) { tabView = (LinearLayout) tabsContainer.getChildAt(i); textView = (TextView) tabView.findViewById(R.id.tab_title_label); if (i == position) { textView.setTextColor(getResources().getColor(checkedTextColor)); } else { textView.setTextColor(getResources().getColor(unCheckedTextColor)); } } } private void addTabView(final int position, String title) { View tabView = null; boolean screenAdaptation = false; final LayoutInflater inflater = LayoutInflater.from(getContext()); if (this.onCustomTabListener != null) { int tabResId = onCustomTabListener.getTabLayoutResId(position); if (tabResId != 0) { tabView = inflater.inflate(tabResId, null); } else { tabView = onCustomTabListener.getTabLayoutView(inflater, position); } screenAdaptation = onCustomTabListener.screenAdaptation(); } if (tabView == null) { tabView = inflater.inflate(R.layout.tab_layout_main, null); } TextView titltTV = ((TextView) tabView.findViewById(R.id.tab_title_label)); TextView unreadTV = ((TextView) tabView.findViewById(R.id.tab_new_msg_label)); final boolean needAdaptation = ScreenUtil.density <= 1.5 && screenAdaptation; final Resources resources = getContext().getResources(); if (titltTV != null) { titltTV.setTextSize(TypedValue.COMPLEX_UNIT_PX, needAdaptation ? resources.getDimensionPixelSize(R.dimen.text_size_11) : resources.getDimensionPixelSize(R.dimen.text_size_15)); titltTV.setText(title); } if (unreadTV != null) { unreadTV.setTextSize(TypedValue.COMPLEX_UNIT_PX, needAdaptation ? resources.getDimensionPixelSize(R.dimen.text_size_9) : resources.getDimensionPixelSize(R.dimen.text_size_12)); } addTab(position, tabView); } private void addTab(final int position, View tab) { tab.setFocusable(true); tab.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { if (pager.getCurrentItem() == position && onTabClickListener != null) { onTabClickListener.onCurrentTabClicked(position); } else { pager.setCurrentItem(position, true); } } }); addTabDoubleTapListener(position, tab); tab.setPadding(tabPadding, 0, tabPadding, 0); tabsContainer.addView(tab, position, tabViewLayoutParams); } private void addTabDoubleTapListener(final int position, View tab) { final GestureDetector gd = new GestureDetector(getContext(), new GestureDetector.SimpleOnGestureListener() { @Override public boolean onDoubleTap(MotionEvent e) { if (onTabDoubleTapListener != null) onTabDoubleTapListener.onCurrentTabDoubleTap(position); return true; } }); tab.setOnTouchListener(new OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { return gd.onTouchEvent(event); } }); } public void updateTab(int index, ReminderItem item) { LinearLayout tabView = (LinearLayout) tabsContainer.getChildAt(index); ImageView indicatorView = (ImageView) tabView.findViewById(R.id.tab_new_indicator); if (item == null || indicatorView == null) { return; } boolean indicator = item.indicator(); indicatorView.setVisibility(indicator ? View.VISIBLE : View.GONE); } 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; } final int height = getHeight(); // draw underline rectPaint.setColor(underlineColor); canvas.drawRect(0, height - underlineHeight, tabsContainer.getWidth(), height, rectPaint); // draw indicator line rectPaint.setColor(indicatorColor); // 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); } canvas.drawRect(lineLeft, height - indicatorHeight, lineRight, height, rectPaint); // draw divider // dividerPaint.setColor(dividerColor); // for (int i = 0; i < tabCount - 1; i++) { // View tab = tabsContainer.getChildAt(i); // canvas.drawLine(tab.getRight(), dividerPadding, tab.getRight(), height - dividerPadding, dividerPaint); // } } public void setIndicatorColor(int indicatorColor) { this.indicatorColor = indicatorColor; invalidate(); } public void setIndicatorColorResource(int resId) { this.indicatorColor = getResources().getColor(resId); invalidate(); } public int getIndicatorColor() { return this.indicatorColor; } public void setIndicatorHeight(int indicatorLineHeightPx) { this.indicatorHeight = indicatorLineHeightPx; invalidate(); } public int getIndicatorHeight() { return indicatorHeight; } public void setUnderlineColor(int underlineColor) { this.underlineColor = underlineColor; invalidate(); } public void setUnderlineColorResource(int resId) { this.underlineColor = getResources().getColor(resId); invalidate(); } public int getUnderlineColor() { return underlineColor; } public void setDividerColor(int dividerColor) { this.dividerColor = dividerColor; invalidate(); } public void setDividerColorResource(int resId) { this.dividerColor = getResources().getColor(resId); invalidate(); } public int getDividerColor() { return dividerColor; } public void setCheckedTextColorResource(int resId) { this.checkedTextColor = resId; invalidate(); } public void setUnderlineHeight(int underlineHeightPx) { this.underlineHeight = underlineHeightPx; invalidate(); } public int getUnderlineHeight() { return underlineHeight; } public void setDividerPadding(int dividerPaddingPx) { this.dividerPadding = dividerPaddingPx; invalidate(); } public int getDividerPadding() { return dividerPadding; } public void setScrollOffset(int scrollOffsetPx) { this.scrollOffset = scrollOffsetPx; invalidate(); } public int getScrollOffset() { return scrollOffset; } public boolean isTextAllCaps() { return textAllCaps; } public void setAllCaps(boolean textAllCaps) { this.textAllCaps = textAllCaps; } public int getTabPaddingLeftRight() { return tabPadding; } @Override public void onRestoreInstanceState(Parcelable state) { SavedState savedState = (SavedState) state; super.onRestoreInstanceState(savedState.getSuperState()); // currentPosition = savedState.currentPosition; currentPosition = 0; 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 void setOnTabClickListener(OnTabClickListener onTabClickListener) { this.onTabClickListener = onTabClickListener; } public void setOnTabDoubleTapListener(OnTabDoubleTapListener onTabDoubleTapListener) { this.onTabDoubleTapListener = onTabDoubleTapListener; } /** * must invoke before setViewPager * * @param onCustomTabListener */ public void setOnCustomTabListener(OnCustomTabListener onCustomTabListener) { this.onCustomTabListener = onCustomTabListener; } /** * TAB ? */ public interface OnTabClickListener { public void onCurrentTabClicked(int position); } /** * TAB ?? */ public interface OnTabDoubleTapListener { public void onCurrentTabDoubleTap(int position); } /** * ??TAB */ public static class OnCustomTabListener { /** * ??TAB?? * ?layout id * * @param position * @return */ public int getTabLayoutResId(int position) { return 0; } /** * ??TAB? * ?view * * @param inflater * @param position * @return */ public View getTabLayoutView(LayoutInflater inflater, int position) { return null; } /** * ??????,?tabtab???,?? * * @return */ public boolean screenAdaptation() { return false; } } }