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.dxj.student.widget; import android.annotation.SuppressLint; import android.content.Context; 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.Log; import android.util.TypedValue; import android.view.LayoutInflater; import android.view.View; import android.view.ViewTreeObserver.OnGlobalLayoutListener; import android.widget.HorizontalScrollView; import android.widget.ImageButton; import android.widget.LinearLayout; import android.widget.TextView; import com.dxj.student.R; import com.dxj.student.utils.MyUtils; import java.util.Locale; public class PagerSlidingTabStrip extends HorizontalScrollView { public interface IconTabProvider { public int getPageIconResId(int position); } private static final int[] ATTRS = new int[] { android.R.attr.textSize, android.R.attr.textColor }; private LinearLayout.LayoutParams defaultTabLayoutParams; private LinearLayout.LayoutParams expandedTabLayoutParams; private final PageListener pageListener = new PageListener(); public OnPageChangeListener delegatePageListener; private LinearLayout tabsContainer; private View view; private ViewPager pager; private int tabCount; private int currentPosition = 0; private float currentPositionOffset = 0f; private Paint rectPaint; private boolean checkedTabWidths = false; private int indicatorColor = 0xFF666666; private int underlineColor = 0x1A000000; private boolean shouldExpand = false; private boolean textAllCaps = true; private int scrollOffset = 105; private int indicatorHeight = 1; private int underlineHeight = 1; private int tabPadding = 0; private int tabTextSize = 15; private int tabTextColor = 0xFF666666; private int lastScrollX = 0; private int tabBackgroundResId = R.mipmap.asv; private Locale locale; private DisplayMetrics dm; private Context context; public PagerSlidingTabStrip(Context c) { this(c, null); this.context = c; } public PagerSlidingTabStrip(Context c, AttributeSet attrs) { this(c, attrs, 0); this.context = c; } public PagerSlidingTabStrip(Context c, AttributeSet attrs, int defStyle) { super(c, attrs, defStyle); this.context = c; setFillViewport(true); setWillNotDraw(false); view = LayoutInflater.from(getContext()).inflate(R.layout.login_bar, null); Log.i("TAG", "view=" + view); tabsContainer = (LinearLayout) view.findViewById(R.id.linear_bar); // tabsContainer = new LinearLayout(context); // tabsContainer.setOrientation(LinearLayout.HORIZONTAL); // tabsContainer.setBackgroundResource(android.R.color.transparent); // tabsContainer.setLayoutParams(new LayoutParams( // LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT)); addView(view); 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_DIP, underlineHeight, dm); tabPadding = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, tabPadding, dm); tabTextSize = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, tabTextSize, dm); TypedArray a = context.obtainStyledAttributes(attrs, ATTRS); tabTextSize = a.getDimensionPixelSize(0, tabTextSize); tabTextColor = a.getColor(1, tabTextColor); a.recycle(); // a = context.obtainStyledAttributes(attrs, // R.styleable.PagerSlidingTabStrip); // // indicatorColor = a // .getColor(R.styleable.PagerSlidingTabStrip_indicatorColor, // indicatorColor); // underlineColor = a // .getColor(R.styleable.PagerSlidingTabStrip_underlineColor, // underlineColor); // indicatorHeight = a.getDimensionPixelSize( // R.styleable.PagerSlidingTabStrip_indicatorHeight, // indicatorHeight); // underlineHeight = a.getDimensionPixelSize( // R.styleable.PagerSlidingTabStrip_underlineHeight, // underlineHeight); // tabPadding = a.getDimensionPixelSize( // R.styleable.PagerSlidingTabStrip_tabPaddingLeftRight, // tabPadding); // tabBackgroundResId = a.getResourceId( // R.styleable.PagerSlidingTabStrip_tabBackground, // tabBackgroundResId); // shouldExpand = a.getBoolean( // R.styleable.PagerSlidingTabStrip_shouldExpand, shouldExpand); // scrollOffset = a.getDimensionPixelSize( // R.styleable.PagerSlidingTabStrip_scrollOffset, scrollOffset); // textAllCaps = a.getBoolean( // R.styleable.PagerSlidingTabStrip_textAllCapss, textAllCaps); a.recycle(); rectPaint = new Paint(); rectPaint.setAntiAlias(true); rectPaint.setStyle(Style.FILL); if (locale == null) { locale = getResources().getConfiguration().locale; } } private int infoDataNum; public void setInfoDataNum(int infoDataNum) { this.infoDataNum = infoDataNum; } public void setViewPager(ViewPager pager) { this.pager = pager; if (infoDataNum >= 4) { defaultTabLayoutParams = new LinearLayout.LayoutParams((MyUtils.getScreenWidth(getContext()) / 4), LayoutParams.MATCH_PARENT); } else if (infoDataNum == 2) { Log.i("TAG", "infoDataNum==2"); defaultTabLayoutParams = new LinearLayout.LayoutParams((MyUtils.dip2px(getContext(), 100)), LayoutParams.MATCH_PARENT); } else if (infoDataNum == 1) { defaultTabLayoutParams = new LinearLayout.LayoutParams((MyUtils.getScreenWidth(getContext()) / 1), LayoutParams.MATCH_PARENT); } else { defaultTabLayoutParams = new LinearLayout.LayoutParams((MyUtils.getScreenWidth(getContext()) / 3), LayoutParams.MATCH_PARENT); } expandedTabLayoutParams = new LinearLayout.LayoutParams(0, LayoutParams.MATCH_PARENT, 1.0f); 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 = pager.getAdapter().getCount(); view.findViewById(R.id.tv_login).setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { pager.setCurrentItem(0); } }); view.findViewById(R.id.tv_right).setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { pager.setCurrentItem(1); } }); // updateTabStyles(); checkedTabWidths = false; 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() == tabCount ? pager.getCurrentItem() - 1 : pager.getCurrentItem(); scrollToChild(currentPosition, 0); } }); } public void setCheckTextTab(int position) { for (int i = 0; i < tabCount; i++) { View v = tabsContainer.getChildAt(i); if (v instanceof TextView) { TextView tab = (TextView) v; if (i == position) { tab.setTextColor(context.getResources().getColor(R.color.msg_color)); } else { tab.setTextColor(context.getResources().getColor(R.color.rbuttonNo)); } } } pager.setCurrentItem(position); } // private void addTextTab(final int position, String title) { // TextView tab = new TextView(getContext()); // tab.setLayoutParams(new LayoutParams( // MyUtils.dip2px(getContext(),20), LayoutParams.WRAP_CONTENT)); // tab.setText(title); // tab.setFocusable(true); // tab.setGravity(Gravity.CENTER); // tab.setSingleLine(); // tab.setBackgroundResource(android.R.color.transparent); // tab.setOnClickListener(new OnClickListener() { // @Override // public void onClick(View v) { // pager.setCurrentItem(position); // } // }); // tabsContainer.addView(tab); // } private void addIconTab(final int position, int resId) { ImageButton tab = new ImageButton(getContext()); tab.setFocusable(true); tab.setImageResource(resId); tab.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { pager.setCurrentItem(position); } }); tabsContainer.addView(tab); } // private void updateTabStyles() { // for (int i = 0; i < tabCount; i++) { // View v = tabsContainer.getChildAt(i); // // if(defaultTabLayoutParams == null){ // System.out.println("defaultTabLayoutParams null"); // }else{ // System.out.println("defaultTabLayoutParams not null"); // } // // v.setLayoutParams(defaultTabLayoutParams); // v.setBackgroundResource(tabBackgroundResId); // if (v instanceof TextView) { // TextView tab = (TextView) v; // tab.setGravity(Gravity.CENTER); // tab.setTextSize(TypedValue.COMPLEX_UNIT_PX, tabTextSize); // tab.setTextColor(tabTextColor); // if (textAllCaps) { // if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) { // tab.setAllCaps(true); // } else { // tab.setText(tab.getText().toString() // .toUpperCase(locale)); // } // } // } // } // } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); if (!shouldExpand || MeasureSpec.getMode(widthMeasureSpec) == MeasureSpec.UNSPECIFIED) { return; } int myWidth = getMeasuredWidth(); int childWidth = 0; for (int i = 0; i < tabCount; i++) { childWidth += tabsContainer.getChildAt(i).getMeasuredWidth(); } if (!checkedTabWidths && childWidth > 0 && myWidth > 0) { if (childWidth <= myWidth) { for (int i = 0; i < tabCount; i++) { tabsContainer.getChildAt(i).setLayoutParams(expandedTabLayoutParams); } } checkedTabWidths = true; } } 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 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 underline rectPaint.setColor(underlineColor); // canvas.drawRect(0, height - underlineHeight, tabsContainer.getWidth(), // height, rectPaint); } private class PageListener implements OnPageChangeListener { @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { scrollToChild(position, (int) (positionOffset * tabsContainer.getChildAt(position).getWidth())); for (int i = 0; i < tabCount; i++) { View v = tabsContainer.getChildAt(i); if (v instanceof TextView) { TextView tab = (TextView) v; if (i == position) { tab.setTextColor(context.getResources().getColor(R.color.msg_color)); } else { tab.setTextColor(context.getResources().getColor(R.color.rbuttonNo)); } } } currentPosition = position; currentPositionOffset = positionOffset; invalidate(); if (delegatePageListener != null) { delegatePageListener.onPageScrolled(position, positionOffset, positionOffsetPixels); } } @Override public void onPageScrollStateChanged(int state) { if (state == ViewPager.SCROLL_STATE_IDLE) { scrollToChild(pager.getCurrentItem(), 0); } if (delegatePageListener != null) { delegatePageListener.onPageScrollStateChanged(state); } } @Override public void onPageSelected(int position) { if (delegatePageListener != null) { delegatePageListener.onPageSelected(position); } } } 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 setUnderlineHeight(int underlineHeightPx) { this.underlineHeight = underlineHeightPx; invalidate(); } public int getUnderlineHeight() { return underlineHeight; } public void setScrollOffset(int scrollOffsetPx) { this.scrollOffset = scrollOffsetPx; invalidate(); } public int getScrollOffset() { return scrollOffset; } public void setShouldExpand(boolean shouldExpand) { this.shouldExpand = shouldExpand; requestLayout(); } public boolean getShouldExpand() { return shouldExpand; } public boolean isTextAllCaps() { return textAllCaps; } public void setAllCaps(boolean textAllCaps) { this.textAllCaps = textAllCaps; } // public void setTextSize(int textSizePx) { // this.tabTextSize = textSizePx; // updateTabStyles(); // } public int getTextSize() { return tabTextSize; } // public void setTextColor(int textColor) { // this.tabTextColor = textColor; // updateTabStyles(); // } // public void setTextColorResource(int resId) { // this.tabTextColor = getResources().getColor(resId); // updateTabStyles(); // } public int getTextColor() { return tabTextColor; } // public void setTabBackground(int resId) { // this.tabBackgroundResId = resId; // } // // public int getTabBackground() { // return tabBackgroundResId; // } // public void setTabPaddingLeftRight(int paddingPx) { // this.tabPadding = paddingPx; // updateTabStyles(); // } public int getTabPaddingLeftRight() { return tabPadding; } @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 Creator<SavedState> CREATOR = new Creator<SavedState>() { @Override public SavedState createFromParcel(Parcel in) { return new SavedState(in); } @Override public SavedState[] newArray(int size) { return new SavedState[size]; } }; } }