preface

AndroidDevelopment,Load the wait requirementA very common
This article will teach you how to do itA lovely & petty bourgeoisie styleWait for loadingAndroidThe customViewControl, hope you like it.

Open source on Github: Kawaii_LoadingView, welcome Star!

1. Introduction

A cute, fresh & xiaozi style Android custom View control

Open source on Github: Kawaii_LoadingView, welcome Star!

2. Application scenarios

When the App is waiting for loading for a long time, it is used to remind users of the progress & relieve users’ emotions

Characteristics of 3.

Kawaii_LoadingView is a Kawaii_LoadingView control.

3.1 Fresh style

Compare the market in a variety of cool, dazzling load waiting custom controls, theKawaii_LoadingView 的 Fresh & xiaozi styleIt’s a clean stream
Also available according to yourAppPosition & main color color adjustment to make the control more consistentAppIn the image. Details are as follows:

3.2 Easy To Use

Only 3 steps & simple configuration.

See article: Android Open Source Controls: a load waiting custom View that you can’t miss with cute & petty style

3.3 Low cost of secondary development

This project is already inGithubThe open source:Kawaii_LoadingView
Detailed source code analysis documentation: See section 6 of this article for details

Therefore, it is very cheap to do secondary development & customization on it.

4. Specific use

See article: Android Open Source Controls: a load waiting custom View that you can’t miss with cute & petty style

5. Full Demo address

Carson_Ho Github address: Kawaii_LoadingView_TestDemo

6. Source code analysis

Below, I will teach you how to implement this cute & xiaozi style load wait Android custom View control

6.1 Preparations

Grid specification

Block Type Description

6.2 Principles of Animation

Hides fixed 2 squares & moves the position of 1 of them

Note: Only external blocks move

Animate properties (Pan + Rotate = combination animation) to change the position of the moving block & rotation Angle
By calling theinvalidate()Redraw to achieve dynamic animation effects
The specific schematic diagram is as follows:

6.3 Implementation Procedure

I’ll go through each step in detail below:

Step 1: Initialize the animation properties

Attribute Description:

Specific property Settings

Add properties file

attrs.xml

<? xml version="1.0" encoding="utf-8"? > <resources> <declare-styleable name="Kawaii_LoadingView">
        <attr name="half_BlockWidth" format="dimension" />
        <attr name="blockInterval" format="dimension" />
        <attr name="initPosition" format="integer" />
        <attr name="isClock_Wise" format="boolean" />
        <attr name="lineNumber" format="integer"  />
        <attr name="moveSpeed" format="integer"  />
        <attr name="blockColor" format="color"  />
        <attr name="moveBlock_Angle" format="float"  />
        <attr name="fixBlock_Angle" format="float"  />
        <attr name="move_Interpolator" format="reference"  />
    </declare-styleable>
</resources>
Copy the code

Specific source code analysis

private void initAttrs(Context context, AttributeSet attrs) {/ / controls resource name TypedArray TypedArray = context. ObtainStyledAttributes (attrs. R.styleable.Kawaii_LoadingView); // Number of lines (minimum 3 lines) lineNumber = typeDarray. getInteger(r.tyleable. Kawaii_LoadingView_lineNumber, 3);if(lineNumber < 3) { lineNumber = 3; } // The width of half a block (dp) half_BlockWidth = typeDarray.getDimension (r.style.kawaii_loadingView_half_BlockWidth, 30); Kawaii_LoadingView_blockInterval = typeDarray.getDimension (r.tyleable.kawaii_loadingView_blockInterval, 10); MoveBlock_Angle = typeDarray.getFloat (r.style.kawaii_loadingView_moveBlock_angle, 10); Kawaii_LoadingView_fixBlock_Angle = typeDarray.getFloat (r.style.kawaii_loadingView_fixBlock_angle, 30); // Better animation can be achieved by setting the radius of the two squares so that they are different // Square color (using hexadecimal code, e.g# 333, # 8 e8e8e)int defaultColor = context.getResources().getColor(R.color.colorAccent); // defaultColor blockColor = typedarray.getcolor (r.tyleable. Kawaii_LoadingView_blockColor, defaultColor); InitPosition = typeDarray.getInteger (r.tyleable.kawaii_loadingView_initPosition, 0); // Since the moving blocks can only be external blocks, we need to determine whether the blocks are external blocks --> attention 1if(isInsideTheRect(initPosition, lineNumber)) { initPosition = 0; IsClock_Wise = typeDarray.getBoolean (r.style.kawaii_loadingView_ISClock_wise,true); // Move the block speed // note: It is not recommended that users set the speed too fast // as this will cause ValueAnimator objects to be repeatedly created. MoveSpeed = typeDarray. getInteger(r.tyleable. Kawaii_LoadingView_moveSpeed, 250); Int move_InterpolatorResId = typeDarray.getResourceId (r.stringable. kawaii_loadingView_interpolator, android.R.anim.linear_interpolator); move_Interpolator = AnimationUtils.loadInterpolator(context, move_InterpolatorResId); MCurrEmptyPosition = initPosition; // Release the resource typedarray.recycle (); } private Boolean isInsideTheRect(int pos, int lineCount) {// Check whether the block is in line 1if (pos < lineCount) {
            return false; // is the last line}else if (pos > (lineCount * lineCount - 1 - lineCount)) {
            return false; // is the last line}else if ((pos + 1) % lineCount == 0) {
            return false; // if in line 1}else if (pos % lineCount == 0) {
            return false; } // If not on the 4 side, insidereturn true; } // return to the original positionCopy the code

Step 2: Initialize the relationship between the square object &

    private void init() {// Initialize the paintbrush mPaint = new Paint(paint.anti_alias_flag); mPaint.setColor(blockColor); // Initialize block objects & relationships ->> Focus on 1 initBlocks(initPosition); } private void initBlocks(int initPosition) {// 1. LineNumber = lineNumber * lineNumber // lineNumber = lineNumber of blocks // fixedBlock = fixedBlock class ->> attention 2 mfixedBlocks = new fixedBlock[lineNumber * lineNumber]; // 2. Create a blockfor(int i = 0; i < mfixedBlocks.length; MfixedBlocks [I] = new fixedBlock(); MfixedBlocks [I].index = I; mfixedBlocks[I].index = I; // If the position of the block = move the initial position of the block, then hide; MfixedBlocks [I]. IsShow = initPosition == I?false : true; mfixedBlocks[i].rectF = new RectF(); } // 3. Create MoveBlock(1) ->> attention 3 mMoveBlock = new MoveBlock(); mMoveBlock.rectF = new RectF(); mMoveBlock.isShow =false; // Because the external block serial number ≠ 0, 1, 2... Relate_OuterBlock (mfixedBlocks, isClock_Wise); relate_OuterBlock(mfixedBlocks, isClock_Wise); } private class fixedBlock {private class fixedBlock {// RectF RectF; // int index; // flag bit: determine whether to draw Boolean isShow; // Point to the next position to move fixedBlock next; // External block serial number ≠ 0, 1, 2... // Return to the original position /** * focus on 3 * : MoveBlock (inner class) */ private class MoveBlock {// Store the coordinate position parameter of the block RectF RectF; // int index; // flag bit: determine whether to draw Boolean isShow; // Rotation center coordinates // rotation center when moving (X, Y)float cx;
        floatcy; ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** * IsClockwise (clockwise Or counterclockwise) */ private void relate_OuterBlock(fixedBlock[] fixedBlocks, boolean isClockwise) { int lineCount = (int) Math.sqrt(fixedBlocks.length); // Case 1: associate line 1for(int i = 0; i < lineCount; I++) {// is at the far leftif(i % lineCount == 0) { fixedBlocks[i].next = isClockwise ? fixedBlocks[i + lineCount] : fixedBlocks[i + 1]; // at the far right}else if((i + 1) % lineCount == 0) { fixedBlocks[i].next = isClockwise ? fixedBlocks[i - 1] : fixedBlocks[i + lineCount]; / / intermediate}else{ fixedBlocks[i].next = isClockwise ? fixedBlocks[i - 1] : fixedBlocks[i + 1]; }} // Case 2: associate the last 1 linefor(int i = (lineCount - 1) * lineCount; i < lineCount * lineCount; I++) {// is at the far leftif(i % lineCount == 0) { fixedBlocks[i].next = isClockwise ? fixedBlocks[i + 1] : fixedBlocks[i - lineCount]; // at the far right}else if((i + 1) % lineCount == 0) { fixedBlocks[i].next = isClockwise ? fixedBlocks[i - lineCount] : fixedBlocks[i - 1]; / / intermediate}else{ fixedBlocks[i].next = isClockwise ? fixedBlocks[i + 1] : fixedBlocks[i - 1]; }} // Case 3: associate column 1for(int i = 1 * lineCount; i <= (lineCount - 1) * lineCount; I += lineCount) {// if the first column is last 1if (i == (lineCount - 1) * lineCount) {
                fixedBlocks[i].next = isClockwise ? fixedBlocks[i + 1] : fixedBlocks[i - lineCount];
                continue; } fixedBlocks[i].next = isClockwise ? fixedBlocks[i + lineCount] : fixedBlocks[i - lineCount]; } // Case 4: associate the last columnfor(int i = 2 * lineCount - 1; i <= lineCount * lineCount - 1; I += lineCount) {// If the last column is the last oneif (i == lineCount * lineCount - 1) {
                fixedBlocks[i].next = isClockwise ? fixedBlocks[i - lineCount] : fixedBlocks[i - 1];
                continue; } fixedBlocks[i].next = isClockwise ? fixedBlocks[i - lineCount] : fixedBlocks[i + lineCount]; }} // Please go back to the original placeCopy the code

Step 3: Set the initial position of the square

// This step is written in onSizeChanged() @override protected void onSizeChanged(int w, int h, int oldw, int oldh) { OnCreate after onDraw before onDraw; Change the size of the view will call the method / / usage scenarios: used to screen the size of the change, need according to the high screen width to determine other variables can be initialized here. Super onSizeChanged (w, h, oldw, oldh); int measuredWidth = getMeasuredWidth(); int measuredHeight = getMeasuredHeight(); MeasuredWidth = measuredWidth / 2; // measuredWidth = measuredWidth / 2; int cy = measuredHeight / 2; 1 fixedBlockPosition(mfixedBlocks, Cx, cy, blockInterval, half_BlockWidth); 2 MoveBlockPosition(mfixedBlocks, mMoveBlock, initPosition, isClock_Wise); } private void fixedBlockPosition(fixedBlock[] fixedBlocks, int cx, int cy,float dividerWidth, floatHalfSquareWidth) {// if the number of rows is even/odd // if the number of rows is even/odd //float squareWidth = halfSquareWidth * 2;
        int lineCount = (int) Math.sqrt(fixedBlocks.length);
        float firstRectLeft = 0;
        floatfirstRectTop = 0; // Case 1: when the number of rows = evenif (lineCount % 2 == 0) {
            int squareCountInAline = lineCount / 2;
            int diviCountInAline = squareCountInAline - 1;
            floatfirstRectLeftTopFromCenter = squareCountInAline * squareWidth + diviCountInAline * dividerWidth + dividerWidth / 2; firstRectLeft = cx - firstRectLeftTopFromCenter; firstRectTop = cy - firstRectLeftTopFromCenter; // Case 2: when the number of rows is odd}else {
            int squareCountInAline = lineCount / 2;
            int diviCountInAline = squareCountInAline;
            floatfirstRectLeftTopFromCenter = squareCountInAline * squareWidth + diviCountInAline * dividerWidth + halfSquareWidth; firstRectLeft = cx - firstRectLeftTopFromCenter; firstRectTop = cy - firstRectLeftTopFromCenter; firstRectLeft = cx - firstRectLeftTopFromCenter; firstRectTop = cy - firstRectLeftTopFromCenter; } // 2. Determine the position of the remaining square // thought: move the position of the first row of square down // passforLoop determination: firstforLoop = row, second = columnfor(int i = 0; i < lineCount; I++) {/ / linefor(int j = 0; j < lineCount; J++) {/ / columnif (i == 0) {
                    if (j == 0) {
                        fixedBlocks[0].rectF.set(firstRectLeft, firstRectTop,
                                firstRectLeft + squareWidth, firstRectTop + squareWidth);
                    } else{ int currIndex = i * lineCount + j; fixedBlocks[currIndex].rectF.set(fixedBlocks[currIndex - 1].rectF); fixedBlocks[currIndex].rectF.offset(dividerWidth + squareWidth, 0); }}else{ int currIndex = i * lineCount + j; fixedBlocks[currIndex].rectF.set(fixedBlocks[currIndex - lineCount].rectF); fixedBlocks[currIndex].rectF.offset(0, dividerWidth + squareWidth); }}}} // Back to square one /** * Attention 2: */ private void MoveBlockPosition(fixedBlock[] fixedBlocks, MoveBlock, int initPosition, Boolean isClockwise) {// Move block position = set the next position of the initial vacant position (next) // Next position is determined by the position of the attached external block fixedBlock = fixedBlocks[initPosition]; moveBlock.rectF.set(fixedBlock.next.rectF); } // return to the original positionCopy the code

Step 4: Draw squares

@override protected void onDraw(Canvas Canvas) {// 1. Draw inner block (fixed)for(int i = 0; i < mfixedBlocks.length; I++) {// determine whether to draw according to the flag bitif(mfixedBlocks[I].isshow) {canvas. DrawRoundRect (mfixedBlocks[I].rectf, fixBlock_Angle, fixBlock_Angle, mPaint); }} // 2. Draw the moving blockif(mMoveBlock.isShow) { canvas.rotate(isClock_Wise ? mRotateDegree : -mRotateDegree, mMoveBlock.cx, mMoveBlock.cy); canvas.drawRoundRect(mMoveBlock.rectF, moveBlock_Angle, moveBlock_Angle, mPaint); }}Copy the code

Step 5: Set up the animation

The steps to achieve this animation include: set up pan animation, rotate animation & composite animation.

1. Set the pan animation

    private ValueAnimator createTranslateValueAnimator(fixedBlock currEmptyfixedBlock,
                                                       fixedBlock moveBlock) {
        float startAnimValue = 0;
        floatendAnimValue = 0; PropertyValuesHolder left = null; PropertyValuesHolder top = null; ValueAnimator ValueAnimator = new ValueAnimator().setDuration(moveSpeed); // 2. Set the direction of movement // the situation can be divided into 4 kinds, respectively, move the block left, right and up and down // Note: we need to consider the direction of rotation (isClock_Wise), namely clockwise ->> attention 1if(isNextRollLeftOrRight(currEmptyfixedBlock, moveBlock)) {// Case 1: clockwise and on the first line/counterclockwise and on the last line, move the block to the rightif(isClock_Wise && currEmptyfixedBlock.index > moveBlock.index || ! isClock_Wise && currEmptyfixedBlock.index > moveBlock.index) { startAnimValue = moveBlock.rectF.left; endAnimValue = moveBlock.rectF.left + blockInterval; // Case 2: clockwise and in the last row/counterclockwise and in the first row, move the block to the left}else if(isClock_Wise && currEmptyfixedBlock.index < moveBlock.index || ! isClock_Wise && currEmptyfixedBlock.index < moveBlock.index) { startAnimValue = moveBlock.rectF.left; endAnimValue = moveBlock.rectF.left - blockInterval; } / / set the attribute value left = PropertyValuesHolder. OfFloat ("left", startAnimValue, endAnimValue);
            valueAnimator.setValues(left);

        } else{// Case 3: Clockwise and in the left-most column/counterclockwise and in the right-most column, move the block upif(isClock_Wise && currEmptyfixedBlock.index < moveBlock.index || ! isClock_Wise && currEmptyfixedBlock.index < moveBlock.index) { startAnimValue = moveBlock.rectF.top; endAnimValue = moveBlock.rectF.top - blockInterval; // Case 4: clockwise and in the rightmost column/counterclockwise and in the leftmost column, move the block down}else if(isClock_Wise && currEmptyfixedBlock.index > moveBlock.index || ! isClock_Wise && currEmptyfixedBlock.index > moveBlock.index) { startAnimValue = moveBlock.rectF.top; endAnimValue = moveBlock.rectF.top + blockInterval; } / top/set attribute value = PropertyValuesHolder ofFloat ("top", startAnimValue, endAnimValue); valueAnimator.setValues(top); } / / 3. ValueAnimator through update listener attribute value. AddUpdateListener (new valueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                Object left = animation.getAnimatedValue("left");
                Object top = animation.getAnimatedValue("top");
                if(left ! = null) { mMoveBlock.rectF.offsetTo((Float) left, mMoveBlock.rectF.top); }if(top ! = null) { mMoveBlock.rectF.offsetTo(mMoveBlock.rectF.left, (Float) top); } // Update rotation center in real time ->> Focus 2setMoveBlockRotateCenter(mMoveBlock, isClock_Wise); // Update drawing invalidate(); }});returnvalueAnimator; } // This step is completed /** * / private Boolean isNextRollLeftOrRight(fixedBlock currEmptyfixedBlock, fixedBlock rollSquare) {if (currEmptyfixedBlock.rectF.left - rollSquare.rectF.left == 0) {
            return false;
        } else {
            return true; }} // return to the original position /** ** focus 2: Update the center of rotation of MoveBlock */ private void */ cx,cysetMoveBlockRotateCenter(MoveBlock MoveBlock, Boolean isClockwise) {// Case 1: Move the upper left corner of the block as the rotation centerif(moveBlock.index == 0) { moveBlock.cx = moveBlock.rectF.right; moveBlock.cy = moveBlock.rectF.bottom; // Case 2: Move the lower right corner of the box as the rotation center}else if(moveBlock.index == lineNumber * lineNumber - 1) { moveBlock.cx = moveBlock.rectF.left; moveBlock.cy = moveBlock.rectF.top; // Case 3: Move the lower left corner of the box as the rotation center}else if(moveBlock.index == lineNumber * (lineNumber - 1)) { moveBlock.cx = moveBlock.rectF.right; moveBlock.cy = moveBlock.rectF.top; // Case 4: Move the upper right corner of the box as the rotation center}else if(moveBlock.index == lineNumber - 1) { moveBlock.cx = moveBlock.rectF.left; moveBlock.cy = moveBlock.rectF.bottom; } // The following judgments depend on the direction of rotation: clockwise or clockwise // Case 1: leftelse if(moveBlock.index % lineNumber == 0) { moveBlock.cx = moveBlock.rectF.right; moveBlock.cy = isClockwise ? moveBlock.rectF.top : moveBlock.rectF.bottom; // Case 2: top}else if(moveBlock.index < lineNumber) { moveBlock.cx = isClockwise ? moveBlock.rectF.right : moveBlock.rectF.left; moveBlock.cy = moveBlock.rectF.bottom; }}else if((moveBlock.index + 1) % lineNumber == 0) { moveBlock.cx = moveBlock.rectF.left; moveBlock.cy = isClockwise ? moveBlock.rectF.bottom : moveBlock.rectF.top; // Case 4: below}else if(moveBlock.index > (lineNumber - 1) * lineNumber) { moveBlock.cx = isClockwise ? moveBlock.rectF.left : moveBlock.rectF.right; moveBlock.cy = moveBlock.rectF.top; }} // Go backCopy the code

2. Set the rotation animation

private ValueAnimator createMoveValueAnimatorValueAnimator moveAnim = ValueAnimator.offloat (0, 90).setDuration(moveSpeed); moveAnim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) { Object animatedValue = animation.getAnimatedValue(); // assign mRotateDegree = (float) animatedValue; // Update view invalidate(); }});returnmoveAnim; } // This step is completeCopy the code

3. Set up the composite animation

private void setAnimation () {// 1. Get the empty position of the fixedBlock, that is, move the current position of the block. FixedBlock movedBlock = curremptyFixedBlock. next; / / 3. Set the animation of the interpolation mAnimatorSet change setInterpolator (move_Interpolator); mAnimatorSet.playTogether(translateConrtroller, moveConrtroller); mAnimatorSet.addListener(newAnimatorListenerAdapter@override public void onAnimationStart(Animator animation) {// The position of the moving block needs to be updated before each animation starts ->> Attention 1 updateMoveBlock(); MfixedBlocks [mCurrEmptyPosition].next. IsShow = mfixedBlocks[mCurrEmptyPositionfalse; // Display the moving block with the flag bit mmoveBlock. isShow =true; @override public void onAnimationEnd(Animator animation) {isMoving =false;
                mfixedBlocks[mCurrEmptyPosition].isShow = true; mCurrEmptyPosition = mfixedBlocks[mCurrEmptyPosition].next.index; // Hide the moving block mmoveBlock. isShow =false; // Use the flag bit to determine whether the animation should be loopedif(mAllowRoll) { startMoving(); }}}); /** * note 1: Update the position of the moving block */ private voidupdateMoveBlock() {

        mMoveBlock.rectF.set(mfixedBlocks[mCurrEmptyPosition].next.rectF);
        mMoveBlock.index = mfixedBlocks[mCurrEmptyPosition].next.index;
        setMoveBlockRotateCenter(mMoveBlock, isClock_Wise); } // return to the original positionCopy the code

Step 6: Start the animation

public void startMoving() {// 1. Determine whether animation needs to be started according to whether flag bit & view is visible // Set here to facilitate manual & automatic animation stopif(isMoving || getVisibility() ! = View.VISIBLE ) {return; } // 2. Set the flag bit to whether to stop the animation isMoving =true;
        mAllowRoll = true; // 3. Start animation manimatorset.start (); // Stop animation public voidstopMoving() {// Use the flag bit to set mAllowRoll =false;
    }
Copy the code

At this point, the small fresh load waiting for the custom control source code analysis is finished
Complete source address: https://github.com/Carson-Ho/Kawaii_LoadingView

7. Contribute code

I hope you can work with me to improve this fresh & xiaozi style of custom controls, see: contribute code notes
Comments & suggestions about the open source project can be made on Issue. welcomeStar ！

Github Kawaii_LoadingView

8. To summarize

I’m sure you’ll love this refreshing little load wait custom control

Open source on Github: Kawaii_LoadingView, welcome Star!

In addition, I have some interesting customizationsViewExamples explained, interested can continue to pay attention toCarson_Ho android Development Notes

A. Hand in hand to teach you to achieve a simple and easy to use search box (including historical search records)

B. You need a simple and useful SuperEditText(Delete & Custom Styles)

C. Android custom View Combat Series: Timeline

Thumb up, please! Because your encouragement is the biggest power that I write!

Refer to the article

http://www.jianshu.com/p/9a6cbb7aa54f http://www.jianshu.com/p/2412d00a0ce4 http://www.jianshu.com/p/733532041f46 http://halohoop.com/2017/06/04/roll_loading/ http://www.jianshu.com/p/e9d8420b1b9c http://www.jianshu.com/p/762b490403c3 http://www.jianshu.com/p/1dab927b2f36 http://www.jianshu.com/p/158736a2549d http://www.jianshu.com/p/146e5cec4863

mo4tech.com (Moment For Technology) is a global community with thousands techies from across the global hang out!Passionate technologists, be it gadget freaks, tech enthusiasts, coders, technopreneurs, or CIOs, you would find them all here.

Android open source: want to send you a small and fresh load wait control

preface

directory

1. Introduction

2. Application scenarios

Characteristics of 3.

3.1 Fresh style

3.2 Easy To Use

3.3 Low cost of secondary development

4. Specific use

5. Full Demo address

6. Source code analysis

6.1 Preparations

6.2 Principles of Animation

6.3 Implementation Procedure

Step 1: Initialize the animation properties

Step 2: Initialize the relationship between the square object &

Step 3: Set the initial position of the square

Step 4: Draw squares

Step 5: Set up the animation

Step 6: Start the animation

7. Contribute code

8. To summarize

Thumb up, please! Because your encouragement is the biggest power that I write!

Android open source: want to send you a small and fresh load wait control

preface

directory

1. Introduction

2. Application scenarios

Characteristics of 3.

3.1 Fresh style

3.2 Easy To Use

3.3 Low cost of secondary development

4. Specific use

5. Full Demo address

6. Source code analysis

6.1 Preparations

6.2 Principles of Animation

6.3 Implementation Procedure

Step 1: Initialize the animation properties

Step 2: Initialize the relationship between the square object &

Step 3: Set the initial position of the square

Step 4: Draw squares

Step 5: Set up the animation

Step 6: Start the animation

7. Contribute code

8. To summarize

Thumb up, please! Because your encouragement is the biggest power that I write!

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