Java tutorial
/* * Copyright (C) 2013 The Android Open Source Project * * 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.snypir.callback.view; import android.animation.ArgbEvaluator; import android.animation.ObjectAnimator; import android.content.Context; import android.graphics.Color; import android.graphics.drawable.ColorDrawable; import android.graphics.drawable.Drawable; import android.support.v4.view.PagerAdapter; import android.support.v4.view.ViewPager; import android.util.AttributeSet; import android.view.Gravity; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.view.inputmethod.InputMethodManager; import android.widget.FrameLayout; import android.widget.HorizontalScrollView; import android.widget.ImageView; import android.widget.LinearLayout; import com.snypir.callback.R; import org.jetbrains.annotations.Nullable; /** * 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(android.support.v4.view.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...)} and {@link #setDividerColors(int...)}. The * alternative is via the {@link com.snypir.callback.view.SlidingTabLayout.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 { private static final int TAB_VIEW_PADDING_VERTICAL_DIPS = 10; private static final int[] IMAGES = new int[] { R.drawable.ic_man, R.drawable.ic_star, R.drawable.ic_empty_star, R.drawable.ic_sotry, R.drawable.ic_ninja }; private static final int[] COLORS = new int[] { R.color.dark, R.color.blue, R.color.yellow, R.color.purple, R.color.orange }; private static final int TITLE_OFFSET_DIPS = 64; private final SlidingTabStrip mTabStrip; private final int mTitleOffset; private int mTabViewLayoutId; private int mTabViewTextViewId; @Nullable private ViewPager mViewPager; private ViewPager.OnPageChangeListener mViewPagerPageChangeListener; 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); FrameLayout.LayoutParams layoutParams = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT); layoutParams.gravity = Gravity.CENTER; mTabStrip.setBackgroundDrawable(new ColorDrawable(getResources().getColor(COLORS[0]))); addView(mTabStrip, layoutParams); } /** * Set the custom {@link com.snypir.callback.view.SlidingTabLayout.TabColorizer} to be used. * <p/> * If you only require simple custmisation then you can use * {@link #setSelectedIndicatorColors(int...)} and {@link #setDividerColors(int...)} to achieve * similar effects. */ public void setCustomTabColorizer(TabColorizer tabColorizer) { mTabStrip.setCustomTabColorizer(tabColorizer); } /** * 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); } /** * Sets the colors to be used for tab dividers. These colors are treated as a circular array. * Providing one color will mean that all tabs are indicated with the same color. */ public void setDividerColors(int... colors) { mTabStrip.setDividerColors(colors); } /** * Set the {@link android.support.v4.view.ViewPager.OnPageChangeListener}. When using {@link com.snypir.callback.view.SlidingTabLayout} you are * required to set any {@link android.support.v4.view.ViewPager.OnPageChangeListener} through this method. This is so * that the layout can update it's scroll position correctly. * * @see android.support.v4.view.ViewPager#setOnPageChangeListener(android.support.v4.view.ViewPager.OnPageChangeListener) */ public void setOnPageChangeListener(ViewPager.OnPageChangeListener listener) { mViewPagerPageChangeListener = 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 android.widget.TextView} in the inflated view */ public void setCustomTabView(int layoutResId, int textViewId) { mTabViewLayoutId = layoutResId; mTabViewTextViewId = textViewId; } /** * 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(@Nullable 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 ImageView createDefaultTabView(Context context) { ImageView imageView = new ImageView(context); imageView.setAdjustViewBounds(true); int padding = (int) (TAB_VIEW_PADDING_VERTICAL_DIPS * getResources().getDisplayMetrics().density); imageView.setPadding(padding, padding, padding, padding); return imageView; } private void populateTabStrip() { final PagerAdapter adapter = mViewPager.getAdapter(); final OnClickListener tabClickListener = new TabClickListener(); for (int i = 0; i < adapter.getCount(); i++) { View tabView = null; ImageView tabTitleView = null; if (mTabViewLayoutId != 0) { // If there is a custom tab view layout id set, try and inflate it tabView = LayoutInflater.from(getContext()).inflate(mTabViewLayoutId, mTabStrip, false); tabTitleView = (ImageView) tabView.findViewById(mTabViewTextViewId); } if (tabView == null) { tabView = createDefaultTabView(getContext()); } if (tabTitleView == null && ImageView.class.isInstance(tabView)) { tabTitleView = (ImageView) tabView; } // tabTitleView.setText(adapter.getPageTitle(i)); tabTitleView.setImageResource(IMAGES[i]); tabView.setOnClickListener(tabClickListener); mTabStrip.addView(tabView, new LinearLayout.LayoutParams( getResources().getDisplayMetrics().widthPixels / adapter.getCount(), ViewGroup.LayoutParams.WRAP_CONTENT)); } } @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); } } /** * Allows complete control over the colors drawn in the tab layout. Set with * {@link #setCustomTabColorizer(com.snypir.callback.view.SlidingTabLayout.TabColorizer)}. */ public interface TabColorizer { /** * @return return the color of the indicator used when {@code position} is selected. */ int getIndicatorColor(int position); /** * @return return the color of the divider drawn to the right of {@code position}. */ int getDividerColor(int position); } 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); } if (mViewPagerPageChangeListener != null) { mViewPagerPageChangeListener.onPageSelected(position); } int color = Color.TRANSPARENT; Drawable background = mTabStrip.getBackground(); if (background instanceof ColorDrawable) { color = ((ColorDrawable) background).getColor(); } final ObjectAnimator backgroundColorAnimator = ObjectAnimator.ofObject(mTabStrip, "backgroundColor", new ArgbEvaluator(), color, getResources().getColor(COLORS[position])); backgroundColorAnimator.setDuration(300); backgroundColorAnimator.start(); InputMethodManager inputMethodManager = (InputMethodManager) getContext() .getSystemService(Context.INPUT_METHOD_SERVICE); inputMethodManager.hideSoftInputFromWindow(getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS); } } private class TabClickListener implements OnClickListener { @Override public void onClick(View v) { for (int i = 0; i < mTabStrip.getChildCount(); i++) { if (v == mTabStrip.getChildAt(i)) { mViewPager.setCurrentItem(i); return; } } } } }