Java tutorial
/** * * Apache License * Version 2.0, January 2004 * http://www.apache.org/licenses/ * * TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION * * 1. Definitions. * * "License" shall mean the terms and conditions for use, reproduction, * and distribution as defined by Sections 1 through 9 of this document. * * "Licensor" shall mean the copyright owner or entity authorized by * the copyright owner that is granting the License. * * "Legal Entity" shall mean the union of the acting entity and all * other entities that control, are controlled by, or are under common * control with that entity. For the purposes of this definition, * "control" means (i) the power, direct or indirect, to cause the * direction or management of such entity, whether by contract or * otherwise, or (ii) ownership of fifty percent (50%) or more of the * outstanding shares, or (iii) beneficial ownership of such entity. * * "You" (or "Your") shall mean an individual or Legal Entity * exercising permissions granted by this License. * * "Source" form shall mean the preferred form for making modifications, * including but not limited to software source code, documentation * source, and configuration files. * * "Object" form shall mean any form resulting from mechanical * transformation or translation of a Source form, including but * not limited to compiled object code, generated documentation, * and conversions to other media types. * * "Work" shall mean the work of authorship, whether in Source or * Object form, made available under the License, as indicated by a * copyright notice that is included in or attached to the work * (an example is provided in the Appendix below). * * "Derivative Works" shall mean any work, whether in Source or Object * form, that is based on (or derived from) the Work and for which the * editorial revisions, annotations, elaborations, or other modifications * represent, as a whole, an original work of authorship. For the purposes * of this License, Derivative Works shall not include works that remain * separable from, or merely link (or bind by name) to the interfaces of, * the Work and Derivative Works thereof. * * "Contribution" shall mean any work of authorship, including * the original version of the Work and any modifications or additions * to that Work or Derivative Works thereof, that is intentionally * submitted to Licensor for inclusion in the Work by the copyright owner * or by an individual or Legal Entity authorized to submit on behalf of * the copyright owner. For the purposes of this definition, "submitted" * means any form of electronic, verbal, or written communication sent * to the Licensor or its representatives, including but not limited to * communication on electronic mailing lists, source code control systems, * and issue tracking systems that are managed by, or on behalf of, the * Licensor for the purpose of discussing and improving the Work, but * excluding communication that is conspicuously marked or otherwise * designated in writing by the copyright owner as "Not a Contribution." * * "Contributor" shall mean Licensor and any individual or Legal Entity * on behalf of whom a Contribution has been received by Licensor and * subsequently incorporated within the Work. * * 2. Grant of Copyright License. Subject to the terms and conditions of * this License, each Contributor hereby grants to You a perpetual, * worldwide, non-exclusive, no-charge, royalty-free, irrevocable * copyright license to reproduce, prepare Derivative Works of, * publicly display, publicly perform, sublicense, and distribute the * Work and such Derivative Works in Source or Object form. * * 3. Grant of Patent License. Subject to the terms and conditions of * this License, each Contributor hereby grants to You a perpetual, * worldwide, non-exclusive, no-charge, royalty-free, irrevocable * (except as stated in this section) patent license to make, have made, * use, offer to sell, sell, import, and otherwise transfer the Work, * where such license applies only to those patent claims licensable * by such Contributor that are necessarily infringed by their * Contribution(s) alone or by combination of their Contribution(s) * with the Work to which such Contribution(s) was submitted. If You * institute patent litigation against any entity (including a * cross-claim or counterclaim in a lawsuit) alleging that the Work * or a Contribution incorporated within the Work constitutes direct * or contributory patent infringement, then any patent licenses * granted to You under this License for that Work shall terminate * as of the date such litigation is filed. * * 4. Redistribution. You may reproduce and distribute copies of the * Work or Derivative Works thereof in any medium, with or without * modifications, and in Source or Object form, provided that You * meet the following conditions: * * (a) You must give any other recipients of the Work or * Derivative Works a copy of this License; and * * (b) You must cause any modified files to carry prominent notices * stating that You changed the files; and * * (c) You must retain, in the Source form of any Derivative Works * that You distribute, all copyright, patent, trademark, and * attribution notices from the Source form of the Work, * excluding those notices that do not pertain to any part of * the Derivative Works; and * * (d) If the Work includes a "NOTICE" text file as part of its * distribution, then any Derivative Works that You distribute must * include a readable copy of the attribution notices contained * within such NOTICE file, excluding those notices that do not * pertain to any part of the Derivative Works, in at least one * of the following places: within a NOTICE text file distributed * as part of the Derivative Works; within the Source form or * documentation, if provided along with the Derivative Works; or, * within a display generated by the Derivative Works, if and * wherever such third-party notices normally appear. The contents * of the NOTICE file are for informational purposes only and * do not modify the License. You may add Your own attribution * notices within Derivative Works that You distribute, alongside * or as an addendum to the NOTICE text from the Work, provided * that such additional attribution notices cannot be construed * as modifying the License. * * You may add Your own copyright statement to Your modifications and * may provide additional or different license terms and conditions * for use, reproduction, or distribution of Your modifications, or * for any such Derivative Works as a whole, provided Your use, * reproduction, and distribution of the Work otherwise complies with * the conditions stated in this License. * * 5. Submission of Contributions. Unless You explicitly state otherwise, * any Contribution intentionally submitted for inclusion in the Work * by You to the Licensor shall be under the terms and conditions of * this License, without any additional terms or conditions. * Notwithstanding the above, nothing herein shall supersede or modify * the terms of any separate license agreement you may have executed * with Licensor regarding such Contributions. * * 6. Trademarks. This License does not grant permission to use the trade * names, trademarks, service marks, or product names of the Licensor, * except as required for reasonable and customary use in describing the * origin of the Work and reproducing the content of the NOTICE file. * * 7. Disclaimer of Warranty. Unless required by applicable law or * agreed to in writing, Licensor provides the Work (and each * Contributor provides its Contributions) on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or * implied, including, without limitation, any warranties or conditions * of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A * PARTICULAR PURPOSE. You are solely responsible for determining the * appropriateness of using or redistributing the Work and assume any * risks associated with Your exercise of permissions under this License. * * 8. Limitation of Liability. In no event and under no legal theory, * whether in tort (including negligence), contract, or otherwise, * unless required by applicable law (such as deliberate and grossly * negligent acts) or agreed to in writing, shall any Contributor be * liable to You for damages, including any direct, indirect, special, * incidental, or consequential damages of any character arising as a * result of this License or out of the use or inability to use the * Work (including but not limited to damages for loss of goodwill, * work stoppage, computer failure or malfunction, or any and all * other commercial damages or losses), even if such Contributor * has been advised of the possibility of such damages. * * 9. Accepting Warranty or Additional Liability. While redistributing * the Work or Derivative Works thereof, You may choose to offer, * and charge a fee for, acceptance of support, warranty, indemnity, * or other liability obligations and/or rights consistent with this * License. However, in accepting such obligations, You may act only * on Your own behalf and on Your sole responsibility, not on behalf * of any other Contributor, and only if You agree to indemnify, * defend, and hold each Contributor harmless for any liability * incurred by, or claims asserted against, such Contributor by reason * of your accepting any such warranty or additional liability. * * END OF TERMS AND CONDITIONS * * APPENDIX: How to apply the Apache License to your work. * * To apply the Apache License to your work, attach the following * boilerplate notice, with the fields enclosed by brackets "[]" * replaced with your own identifying information. (Don't include * the brackets!) The text should be enclosed in the appropriate * comment syntax for the file format. We also recommend that a * file or class name and description of purpose be included on the * same "printed page" as the copyright notice for easier * identification within third-party archives. * * Copyright 2016 Alibaba Group * * 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.taobao.weex.ui.view; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Paint.Style; import android.support.v4.view.ViewPager.OnPageChangeListener; import android.util.AttributeSet; import android.view.MotionEvent; import android.widget.FrameLayout; import com.taobao.weex.ui.view.gesture.WXGesture; import com.taobao.weex.ui.view.gesture.WXGestureObservable; import com.taobao.weex.utils.WXViewUtils; public class WXBaseCircleIndicator extends FrameLayout implements OnPageChangeListener, WXGestureObservable { private final Paint mPaintPage = new Paint(); private final Paint mPaintStroke = new Paint(); private final Paint mPaintFill = new Paint(); private WXGesture wxGesture; private WXCircleViewPager mCircleViewPager; /** * Radius of the circle */ private float radius; /** * Padding of the circle */ private float circlePadding; /** * Fill color of unselected circle */ private int pageColor; /** * Fill color of the selected circle */ private int fillColor; private int realCurrentItem; private OnPageChangeListener mListener; public WXBaseCircleIndicator(Context context) { super(context); getAttrs(context); init(); } /** * Get attribute of xml */ private void getAttrs(Context context) { radius = WXViewUtils.dip2px(5); circlePadding = WXViewUtils.dip2px(5); pageColor = Color.parseColor("#ffffff"); // strokeWidth= WAViewUtils.dip2px((float)1.5); // strokeColor = Color.parseColor("#FFDDDDDD"); fillColor = Color.parseColor("#ffd545"); } private void init() { mPaintStroke.setAntiAlias(true); mPaintStroke.setStyle(Style.STROKE); // mPaintStroke.setColor(strokeColor); // mPaintStroke.setStrokeWidth(strokeWidth); mPaintFill.setStyle(Style.FILL); mPaintFill.setAntiAlias(true); mPaintPage.setAntiAlias(true); mPaintPage.setColor(pageColor); mPaintFill.setStyle(Style.FILL); mPaintFill.setColor(fillColor); this.setWillNotDraw(false); } /** * @param context * @param attrs */ public WXBaseCircleIndicator(Context context, AttributeSet attrs) { super(context, attrs); getAttrs(context); init(); } public void setOnPageChangeListener(OnPageChangeListener listener) { mListener = listener; } /** * @return the mCircleViewPager */ public WXCircleViewPager getCircleViewPager() { return mCircleViewPager; } /** * @param mCircleViewPager the mCircleViewPager to set */ public void setCircleViewPager(WXCircleViewPager mCircleViewPager) { this.mCircleViewPager = mCircleViewPager; if (this.mCircleViewPager != null) { this.mCircleViewPager.setOnPageChangeListener(this); } requestLayout(); } @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { if (mListener != null) { mListener.onPageScrolled(position, positionOffset, positionOffsetPixels); } } @Override public void onPageSelected(int position) { realCurrentItem = mCircleViewPager.getRealCurrentItem(); invalidate(); if (mListener != null) { mListener.onPageSelected(position); } } @Override public void onPageScrollStateChanged(int state) { if (mListener != null) { mListener.onPageScrollStateChanged(state); } } /** * @return the radius */ public float getRadius() { return radius; } /** * @param radius the radius to set */ public void setRadius(float radius) { this.radius = radius; } /** * @return the circlePadding */ public float getCirclePadding() { return circlePadding; } /** * @param circlePadding the circlePadding to set */ public void setCirclePadding(float circlePadding) { this.circlePadding = circlePadding; } /** * @return the fillColor */ public int getFillColor() { return fillColor; } /** * @param fillColor the fillColor to set */ public void setFillColor(int fillColor) { this.fillColor = fillColor; mPaintFill.setColor(fillColor); } public void setPageColor(int pageColor) { this.pageColor = pageColor; mPaintPage.setColor(pageColor); } /** * @return the realCurrentItem */ public int getRealCurrentItem() { return realCurrentItem; } /** * @param realCurrentItem the realCurrentItem to set */ public void setRealCurrentItem(int realCurrentItem) { this.realCurrentItem = realCurrentItem; } // /** // * @return the strokeColor // */ // public int getStrokeColor() { // return strokeColor; // } // // /** // * @param strokeColor the strokeColor to set // */ // public void setStrokeColor(int strokeColor) { // this.strokeColor = strokeColor; // } // // /** // * @return the strokeWidth // */ // public float getStrokeWidth() { // return strokeWidth; // } // // /** // * @param strokeWidth the strokeWidth to set // */ // public void setStrokeWidth(float strokeWidth) { // this.strokeWidth = strokeWidth; // } @Override public void registerGestureListener(WXGesture wxGesture) { this.wxGesture = wxGesture; } @Override public boolean onTouchEvent(MotionEvent event) { boolean result = super.onTouchEvent(event); if (wxGesture != null) { result |= wxGesture.onTouch(this, event); } return result; } @Override protected void onDraw(Canvas canvas) { // TODO Auto-generated method stub super.onDraw(canvas); float firstX = getWidth() / 2 + getPaddingLeft() - getCount() / 2.0f * (radius + circlePadding);// + radius; float firstY = getHeight() / 2 + getPaddingTop();// + radius; //draw stroked circles for (int i = 0; i < getCount(); i++) { float dx = firstX + circlePadding * i + radius * 2 * i; float dy = firstY; if (mPaintStroke.getStrokeWidth() > 0) { canvas.drawCircle(dx, dy, radius, mPaintStroke); } if (mPaintPage.getAlpha() > 0) { canvas.drawCircle(dx, dy, radius, mPaintPage); } } //Draw the filled circle float dx = firstX + realCurrentItem * circlePadding + radius * 2 * realCurrentItem; float dy = firstY; canvas.drawCircle(dx, dy, radius, mPaintFill); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { int viewWidth; int viewHeight; int widthMode = MeasureSpec.getMode(widthMeasureSpec); int widthSize = MeasureSpec.getSize(widthMeasureSpec); int heightMode = MeasureSpec.getMode(heightMeasureSpec); int heightSize = MeasureSpec.getSize(heightMeasureSpec); if (widthMode == MeasureSpec.EXACTLY) { viewWidth = widthSize; } else { viewWidth = (int) (getPaddingLeft() + radius * 2 * getCount() + circlePadding * (getCount() - 1) + getPaddingRight()) + 1; } if (heightMode == MeasureSpec.EXACTLY) { viewHeight = heightSize; } else { viewHeight = (int) (getPaddingTop() + radius * 2 + getPaddingBottom()) + 1; } setMeasuredDimension(viewWidth, viewHeight); } /** * @return the count */ public int getCount() { if (mCircleViewPager == null || mCircleViewPager.getAdapter() == null) { return 0; } return mCircleViewPager.getRealCount(); } }