Java tutorial
/* <<<<<<< Updated upstream * Copyright (C) 2013 The Android Open Source Project ======= * Copyright 2014 Google Inc. All rights reserved. >>>>>>> Stashed changes * * 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 org.codeforafrica.citizenreporter.eNCA.widgets; /*** * IMPORTANT!! this differs from the original in that it has been hacked for WP Android * to optionally support icons & badges rather than text, also added TabClickListener */ import android.animation.Animator; import android.animation.AnimatorListenerAdapter; import android.animation.ObjectAnimator; import android.animation.PropertyValuesHolder; import android.content.Context; import android.graphics.Typeface; import android.support.v4.view.PagerAdapter; import android.support.v4.view.ViewPager; import android.util.AttributeSet; import android.util.SparseArray; import android.util.TypedValue; import android.view.Gravity; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.view.animation.AccelerateInterpolator; import android.view.animation.BounceInterpolator; import android.widget.HorizontalScrollView; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.TextView; import android.widget.Toast; /** * To be used with ViewPager to provide a tab indicator component which give constant feedback as to * the user's scroll progress. * <p> * To use the component, simply add it to your view hierarchy. Then in your * {@link android.app.Activity} or {@link android.support.v4.app.Fragment} call * {@link #setViewPager(ViewPager)} providing it the ViewPager this layout is being used for. * <p> * The colors can be customized in two ways. The first and simplest is to provide an array of colors * via {@link #setSelectedIndicatorColors(int...)}. The * alternative is via the {@link TabColorizer} interface which provides you complete control over * which color is used for any individual position. * <p> * The views used as tabs can be customized by calling {@link #setCustomTabView(int, int)}, * providing the layout ID of your custom layout. */ public class SlidingTabLayout extends HorizontalScrollView { /** * Allows complete control over the colors drawn in the tab layout. Set with * {@link #setCustomTabColorizer(TabColorizer)}. */ public interface TabColorizer { /** * @return return the color of the indicator used when {@code position} is selected. */ int getIndicatorColor(int position); } public interface SingleTabClickListener { void onTabClick(View view, int position); } private static final int TITLE_OFFSET_DIPS = 24; private static final int TAB_VIEW_PADDING_DIPS = 16; private static final int TAB_VIEW_TEXT_SIZE_SP = 12; private int mTitleOffset; private int mTabViewLayoutId; private int mTabViewTextViewId; private boolean mDistributeEvenly; private Integer[] mIcons; private int mTabViewIconViewId; private int mTabBadgeViewId; private Integer[] mTitles; private ViewPager mViewPager; private SparseArray<String> mContentDescriptions = new SparseArray<String>(); private ViewPager.OnPageChangeListener mViewPagerPageChangeListener; private SingleTabClickListener mSingleTabClickListener; private final SlidingTabStrip mTabStrip; public SlidingTabLayout(Context context) { this(context, null); } public SlidingTabLayout(Context context, AttributeSet attrs) { this(context, attrs, 0); } public SlidingTabLayout(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); // Disable the Scroll Bar setHorizontalScrollBarEnabled(false); // Make sure that the Tab Strips fills this View setFillViewport(true); mTitleOffset = (int) (TITLE_OFFSET_DIPS * getResources().getDisplayMetrics().density); mTabStrip = new SlidingTabStrip(context); addView(mTabStrip, LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT); } /** * Set the custom {@link TabColorizer} to be used. * * If you only require simple custmisation then you can use * {@link #setSelectedIndicatorColors(int...)} to achieve * similar effects. */ public void setCustomTabColorizer(TabColorizer tabColorizer) { mTabStrip.setCustomTabColorizer(tabColorizer); } public void setDistributeEvenly(boolean distributeEvenly) { mDistributeEvenly = distributeEvenly; } /** * Sets the colors to be used for indicating the selected tab. These colors are treated as a * circular array. Providing one color will mean that all tabs are indicated with the same color. */ public void setSelectedIndicatorColors(int... colors) { mTabStrip.setSelectedIndicatorColors(colors); } /** * Set the {@link ViewPager.OnPageChangeListener}. When using {@link SlidingTabLayout} you are * required to set any {@link ViewPager.OnPageChangeListener} through this method. This is so * that the layout can update it's scroll position correctly. * * @see ViewPager#setOnPageChangeListener(ViewPager.OnPageChangeListener) */ public void setOnPageChangeListener(ViewPager.OnPageChangeListener listener) { mViewPagerPageChangeListener = listener; } public void setOnSingleTabClickListener(SingleTabClickListener listener) { mSingleTabClickListener = listener; } /** * Set the custom layout to be inflated for the tab views. * * @param layoutResId Layout id to be inflated * @param textViewId id of the {@link TextView} in the inflated view */ public void setCustomTabView(int layoutResId, int textViewId) { mTabViewLayoutId = layoutResId; mTabViewTextViewId = textViewId; } /** * Set the custom layout to be inflated for the tab views. * * @param layoutResId Layout id to be inflated * @param textViewId id of the {@link TextView} in the inflated view * @param titles page titles */ public void setCustomTabView(int layoutResId, int textViewId, Integer[] titles) { mTabViewLayoutId = layoutResId; mTabViewTextViewId = textViewId; mTitles = titles; } /* * use this version to display icons rather than text */ public void setCustomTabView(int layoutResId, int imageViewId, int badgeViewId, Integer[] icons) { mTabViewLayoutId = layoutResId; mTabViewIconViewId = imageViewId; mTabBadgeViewId = badgeViewId; mIcons = icons; } /* * use this version to display icons and text */ public void setCustomTabView(int layoutResId, int textViewId, int imageViewId, Integer[] titles, Integer[] icons) { mTabViewLayoutId = layoutResId; mTabViewIconViewId = imageViewId; mTabViewTextViewId = textViewId; mTitles = titles; mIcons = icons; } public boolean isBadged(int position) { final View badgeView = mTabStrip.findViewWithTag(makeBadgeTag(position)); return badgeView != null && badgeView.getVisibility() == View.VISIBLE; } /* * adds or removes a badge for the tab at the passed index - only enabled when showing icons */ public void setBadge(int position, boolean isBadged) { final View badgeView = mTabStrip.findViewWithTag(makeBadgeTag(position)); if (badgeView == null) { return; } boolean wasBadged = (badgeView.getVisibility() == View.VISIBLE); if (isBadged == wasBadged) { return; } float start = isBadged ? 0f : 1f; float end = isBadged ? 1f : 0f; PropertyValuesHolder scaleX = PropertyValuesHolder.ofFloat(View.SCALE_X, start, end); PropertyValuesHolder scaleY = PropertyValuesHolder.ofFloat(View.SCALE_Y, start, end); ObjectAnimator animScale = ObjectAnimator.ofPropertyValuesHolder(badgeView, scaleX, scaleY); if (isBadged) { animScale.setInterpolator(new BounceInterpolator()); animScale.setDuration(getContext().getResources().getInteger(android.R.integer.config_longAnimTime)); animScale.addListener(new AnimatorListenerAdapter() { @Override public void onAnimationStart(Animator animation) { badgeView.setVisibility(View.VISIBLE); } }); } else { animScale.setInterpolator(new AccelerateInterpolator()); animScale.setDuration(getContext().getResources().getInteger(android.R.integer.config_shortAnimTime)); animScale.addListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { badgeView.setVisibility(View.GONE); } }); } animScale.start(); } /* * creates a unique string to use as a tag for tab-specific badges */ private static String makeBadgeTag(int position) { return "slidingtablayout-badgeview-" + Integer.toString(position); } /** * Sets the associated view pager. Note that the assumption here is that the pager content * (number of tabs and tab titles) does not change after this call has been made. */ public void setViewPager(ViewPager viewPager) { mTabStrip.removeAllViews(); mViewPager = viewPager; if (viewPager != null) { viewPager.setOnPageChangeListener(new InternalViewPagerListener()); populateTabStrip(); } } /** * Create a default view to be used for tabs. This is called if a custom tab view is not set via * {@link #setCustomTabView(int, int)}. */ protected TextView createDefaultTabView(Context context) { TextView textView = new TextView(context); textView.setGravity(Gravity.CENTER); textView.setTextSize(TypedValue.COMPLEX_UNIT_SP, TAB_VIEW_TEXT_SIZE_SP); textView.setTypeface(Typeface.DEFAULT_BOLD); textView.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT)); TypedValue outValue = new TypedValue(); getContext().getTheme().resolveAttribute(android.R.attr.selectableItemBackground, outValue, true); textView.setBackgroundResource(outValue.resourceId); textView.setAllCaps(true); int padding = (int) (TAB_VIEW_PADDING_DIPS * getResources().getDisplayMetrics().density); textView.setPadding(padding, padding, padding, padding); return textView; } private void populateTabStrip() { final PagerAdapter adapter = mViewPager.getAdapter(); final View.OnClickListener tabClickListener = new TabClickListener(); boolean showIcons = (mIcons != null && mIcons.length == adapter.getCount() && mTabViewIconViewId != 0); for (int i = 0; i < adapter.getCount(); i++) { View tabView = null; //if (showIcons) { tabView = LayoutInflater.from(getContext()).inflate(mTabViewLayoutId, mTabStrip, false); ImageView imgIcon = (ImageView) tabView.findViewById(mTabViewIconViewId); imgIcon.setImageDrawable(getContext().getResources().getDrawable(mIcons[i])); TextView tabTitleView = (TextView) tabView.findViewById(mTabViewTextViewId); tabTitleView.setText(getContext().getResources().getString(mTitles[i])); // tag the badge for this tab so it can be found by setBadge() //if (mTabBadgeViewId != 0) { // View badgeView = tabView.findViewById(mTabBadgeViewId); // if (badgeView != null) { // badgeView.setTag(makeBadgeTag(i)); // } // } //} /*else { TextView tabTitleView = null; if (mTabViewLayoutId != 0) { tabView = LayoutInflater.from(getContext()).inflate(mTabViewLayoutId, mTabStrip, false); tabTitleView = (TextView) tabView.findViewById(mTabViewTextViewId); } else { tabView = createDefaultTabView(getContext()); tabTitleView = (TextView) tabView; } if (tabTitleView != null) { if(mTitles!=null) { tabTitleView.setText(getContext().getResources().getString(mTitles[i])); } } }*/ if (mDistributeEvenly) { LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) tabView.getLayoutParams(); lp.width = 0; lp.weight = 1; } tabView.setOnClickListener(tabClickListener); final String desc = mContentDescriptions.get(i, null); if (desc != null) { tabView.setContentDescription(desc); // show toast with content description on long click tabView.setOnLongClickListener(new OnLongClickListener() { @Override public boolean onLongClick(View v) { int offsetX = v.getLeft(); int offsetY = v.getTop() + v.getHeight() + (v.getHeight() / 2); Toast toast = Toast.makeText(v.getContext(), desc, Toast.LENGTH_SHORT); toast.setGravity(Gravity.LEFT | Gravity.TOP, offsetX, offsetY); toast.show(); return true; } }); } mTabStrip.addView(tabView); if (i == mViewPager.getCurrentItem()) { tabView.setSelected(true); } } } public void setContentDescription(int i, String desc) { mContentDescriptions.put(i, desc); } @Override protected void onAttachedToWindow() { super.onAttachedToWindow(); if (mViewPager != null) { scrollToTab(mViewPager.getCurrentItem(), 0); } } private void scrollToTab(int tabIndex, int positionOffset) { final int tabStripChildCount = mTabStrip.getChildCount(); if (tabStripChildCount == 0 || tabIndex < 0 || tabIndex >= tabStripChildCount) { return; } View selectedChild = mTabStrip.getChildAt(tabIndex); if (selectedChild != null) { int targetScrollX = selectedChild.getLeft() + positionOffset; if (tabIndex > 0 || positionOffset > 0) { // If we're not at the first child and are mid-scroll, make sure we obey the offset targetScrollX -= mTitleOffset; } scrollTo(targetScrollX, 0); } } private class InternalViewPagerListener implements ViewPager.OnPageChangeListener { private int mScrollState; @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { int tabStripChildCount = mTabStrip.getChildCount(); if ((tabStripChildCount == 0) || (position < 0) || (position >= tabStripChildCount)) { return; } mTabStrip.onViewPagerPageChanged(position, positionOffset); View selectedTitle = mTabStrip.getChildAt(position); int extraOffset = (selectedTitle != null) ? (int) (positionOffset * selectedTitle.getWidth()) : 0; scrollToTab(position, extraOffset); if (mViewPagerPageChangeListener != null) { mViewPagerPageChangeListener.onPageScrolled(position, positionOffset, positionOffsetPixels); } } @Override public void onPageScrollStateChanged(int state) { mScrollState = state; if (mViewPagerPageChangeListener != null) { mViewPagerPageChangeListener.onPageScrollStateChanged(state); } } @Override public void onPageSelected(int position) { if (mScrollState == ViewPager.SCROLL_STATE_IDLE) { mTabStrip.onViewPagerPageChanged(position, 0f); scrollToTab(position, 0); } for (int i = 0; i < mTabStrip.getChildCount(); i++) { mTabStrip.getChildAt(i).setSelected(position == i); } if (mViewPagerPageChangeListener != null) { mViewPagerPageChangeListener.onPageSelected(position); } } } private class TabClickListener implements View.OnClickListener { @Override public void onClick(View v) { for (int i = 0; i < mTabStrip.getChildCount(); i++) { if (v == mTabStrip.getChildAt(i)) { // fire the single tab click listener before changing the current item if (mSingleTabClickListener != null) { mSingleTabClickListener.onTabClick(v, i); } mViewPager.setCurrentItem(i); return; } } } } }