Java tutorial
/* * Copyright (C) 2011 The Android Open Source Project * Copyright (C) 2011 Jake Wharton * * 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.cmtv.tv.widget.pagerindicator; import com.cmtv.tv.R; import com.cmtv.tv.activity.HomePageActivity; import com.cmtv.tv.widget.BaseViewPager; import com.cmtv.tv.widget.BaseViewPager.OnPageChangeListener; import android.content.Context; import android.graphics.Color; import android.graphics.LinearGradient; import android.graphics.Paint; import android.graphics.Shader; import android.support.v4.view.PagerAdapter; import android.util.AttributeSet; import android.view.Gravity; import android.view.View; import android.view.ViewGroup; import android.widget.FrameLayout; import android.widget.HorizontalScrollView; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.TextView; import static android.view.ViewGroup.LayoutParams.MATCH_PARENT; import static android.view.ViewGroup.LayoutParams.WRAP_CONTENT; /** * This widget implements the dynamic action bar tab behavior that can change * across different configurations or circumstances. */ public class TabPageIndicator extends HorizontalScrollView implements PageIndicator { /** Title text used when no title is provided by the adapter. */ private static final CharSequence EMPTY_TITLE = ""; private Context mContext; private Shader mNormalShader; private Shader mFocusedShader; private int mTextFocusColor; /** * Interface for a callback when the selected tab has been reselected. */ public interface OnTabReselectedListener { /** * Callback when the selected tab has been reselected. * * @param position Position of the current center item. */ void onTabReselected(int position); } private Runnable mTabSelector; private final OnClickListener mTabClickListener = new OnClickListener() { public void onClick(View view) { TabView tabView = (TabView) view; final int oldSelected = mBaseViewPager.getCurrentItem(); final int newSelected = tabView.getIndex(); mBaseViewPager.setCurrentItem(newSelected); if (oldSelected == newSelected && mTabReselectedListener != null) { mTabReselectedListener.onTabReselected(newSelected); } } }; private final IcsLinearLayout mTabLayout; private BaseViewPager mBaseViewPager; private BaseViewPager.OnPageChangeListener mListener; private int mMaxTabWidth; private int mSelectedTabIndex; private OnTabReselectedListener mTabReselectedListener; public TabPageIndicator(Context context) { this(context, null); } public TabPageIndicator(Context context, AttributeSet attrs) { super(context, attrs); setHorizontalScrollBarEnabled(false); //custom mContext = context; this.mTextFocusColor = context.getResources().getColor(R.color.tab_view_indicator_focus_color); this.mFocusedShader = new LinearGradient(0.0f, 0.0f, 0.0f, 50.0f, mTextFocusColor, mTextFocusColor, Shader.TileMode.CLAMP); this.mNormalShader = new LinearGradient(0.0f, 0.0f, 0.0f, 40.0f, Color.WHITE, Color.GRAY, Shader.TileMode.CLAMP); mTabLayout = new IcsLinearLayout(context, R.attr.vpiTabPageIndicatorStyle); addView(mTabLayout, new ViewGroup.LayoutParams(WRAP_CONTENT, MATCH_PARENT)); } public void setOnTabReselectedListener(OnTabReselectedListener listener) { mTabReselectedListener = listener; } @Override public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { final int widthMode = MeasureSpec.getMode(widthMeasureSpec); final boolean lockedExpanded = widthMode == MeasureSpec.EXACTLY; setFillViewport(lockedExpanded); final int childCount = mTabLayout.getChildCount(); if (childCount > 1 && (widthMode == MeasureSpec.EXACTLY || widthMode == MeasureSpec.AT_MOST)) { if (childCount > 2) { mMaxTabWidth = (int) (MeasureSpec.getSize(widthMeasureSpec) * 0.4f); } else { mMaxTabWidth = MeasureSpec.getSize(widthMeasureSpec) / 2; } } else { mMaxTabWidth = -1; } final int oldWidth = getMeasuredWidth(); super.onMeasure(widthMeasureSpec, heightMeasureSpec); final int newWidth = getMeasuredWidth(); if (lockedExpanded && oldWidth != newWidth) { // Recenter the tab display if we're at a new (scrollable) size. setCurrentItem(mSelectedTabIndex); } } private void animateToTab(final int position) { final View tabView = mTabLayout.getChildAt(position); if (mTabSelector != null) { removeCallbacks(mTabSelector); } mTabSelector = new Runnable() { public void run() { final int scrollPos = tabView.getLeft() - (getWidth() - tabView.getWidth()) / 2; smoothScrollTo(scrollPos, 0); mTabSelector = null; } }; post(mTabSelector); } @Override public void onAttachedToWindow() { super.onAttachedToWindow(); if (mTabSelector != null) { // Re-post the selector we saved post(mTabSelector); } } @Override public void onDetachedFromWindow() { super.onDetachedFromWindow(); if (mTabSelector != null) { removeCallbacks(mTabSelector); } } private void addTab(int index, CharSequence text, int iconResId) { final TabView tabView = new TabView(getContext()); tabView.mIndex = index; tabView.setFocusable(true); tabView.setOnClickListener(mTabClickListener); tabView.getTabText().setTextSize(0, this.mContext.getResources().getDimension(R.dimen.universal_large_text_size)); tabView.getTabText().setText(text); //custom tabView.getPaint().setShader(mNormalShader); if (iconResId != 0) { tabView.getTabText().setCompoundDrawablesWithIntrinsicBounds(iconResId, 0, 0, 0); } mTabLayout.addView(tabView, new LinearLayout.LayoutParams(0, MATCH_PARENT, 1)); } @Override public void onPageScrollStateChanged(int arg0) { if (mListener != null) { mListener.onPageScrollStateChanged(arg0); } } @Override public void onPageScrolled(int arg0, float arg1, int arg2) { if (mListener != null) { mListener.onPageScrolled(arg0, arg1, arg2); } } @Override public void onPageSelected(int position) { //custom System.out.println("mSelectedTabIndex : " + mSelectedTabIndex + ", position : " + position); int width = this.mTabLayout.getChildAt(0).getWidth(); int start = width * mSelectedTabIndex; int end = position * width; ((HomePageActivity) mContext).startCursorAnimation(start, end); setCurrentItem(position); if (mListener != null) { mListener.onPageSelected(position); } //custom final int tabCount = mTabLayout.getChildCount(); for (int i = 0; i < tabCount; i++) { final TabView child = (TabView) mTabLayout.getChildAt(i); if (i == position) { child.getPaint().setShader(mFocusedShader); } else { child.getPaint().setShader(mNormalShader); } } } @Override public void setBaseViewPager(BaseViewPager view) { if (mBaseViewPager == view) { return; } if (mBaseViewPager != null) { mBaseViewPager.setOnPageChangeListener(null); } final PagerAdapter adapter = view.getAdapter(); if (adapter == null) { throw new IllegalStateException("BaseViewPager does not have adapter instance."); } mBaseViewPager = view; view.setOnPageChangeListener(this); notifyDataSetChanged(); } public void notifyDataSetChanged() { mTabLayout.removeAllViews(); PagerAdapter adapter = mBaseViewPager.getAdapter(); IconPagerAdapter iconAdapter = null; if (adapter instanceof IconPagerAdapter) { iconAdapter = (IconPagerAdapter) adapter; } final int count = adapter.getCount(); for (int i = 0; i < count; i++) { CharSequence title = adapter.getPageTitle(i); if (title == null) { title = EMPTY_TITLE; } int iconResId = 0; if (iconAdapter != null) { iconResId = iconAdapter.getIconResId(i); } addTab(i, title, iconResId); } if (mSelectedTabIndex > count) { mSelectedTabIndex = count - 1; } setCurrentItem(mSelectedTabIndex); requestLayout(); } @Override public void setBaseViewPager(BaseViewPager view, int initialPosition) { setBaseViewPager(view); setCurrentItem(initialPosition); } @Override public void setCurrentItem(int item) { if (mBaseViewPager == null) { throw new IllegalStateException("BaseViewPager has not been bound."); } mSelectedTabIndex = item; mBaseViewPager.setCurrentItem(item); final int tabCount = mTabLayout.getChildCount(); for (int i = 0; i < tabCount; i++) { final View child = mTabLayout.getChildAt(i); final boolean isSelected = (i == item); child.setSelected(isSelected); if (isSelected) { animateToTab(item); } } } @Override public void setOnPageChangeListener(OnPageChangeListener listener) { mListener = listener; } private class TabView extends FrameLayout { private int mIndex; private TextView tabText; private ImageView nofityImg; public TabView(Context context) { super(context, null, R.attr.vpiTabPageIndicatorStyle); init(); } private void init() { this.tabText = new TextView(getContext()); FrameLayout.LayoutParams layoutParams = new FrameLayout.LayoutParams(WRAP_CONTENT, WRAP_CONTENT); layoutParams.leftMargin = 22; layoutParams.rightMargin = 22; layoutParams.gravity = Gravity.CENTER; this.tabText.setLayoutParams(layoutParams); addView(tabText); this.nofityImg = new ImageView(getContext()); FrameLayout.LayoutParams layoutParams2 = new FrameLayout.LayoutParams(WRAP_CONTENT, WRAP_CONTENT); layoutParams2.gravity = Gravity.RIGHT; this.nofityImg.setLayoutParams(layoutParams2); this.nofityImg.setImageResource(R.drawable.notify_dot); addView(nofityImg); } @Override public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); // Re-measure if we went beyond our maximum size. if (mMaxTabWidth > 0 && getMeasuredWidth() > mMaxTabWidth) { super.onMeasure(MeasureSpec.makeMeasureSpec(mMaxTabWidth, MeasureSpec.EXACTLY), heightMeasureSpec); } } public int getIndex() { return mIndex; } public Paint getPaint() { if (tabText != null) { return tabText.getPaint(); } return new Paint(); } public TextView getTabText() { return tabText; } public void setNotify(boolean isShow) { if (isShow) { nofityImg.setVisibility(View.VISIBLE); } else { nofityImg.setVisibility(View.INVISIBLE); } } } /** * custom */ public void requestFirstTabSelected() { View localView = this.mTabLayout.getChildAt(0); if ((localView != null) && ((localView instanceof TabView))) { ((TabView) localView).getPaint().setShader(this.mFocusedShader); localView.requestFocus(); } } }