寫在前面

最近由于項(xiàng)目需求，需要有一個(gè)類似蘋果的滑動(dòng)解鎖控件，抱著萬事不求人的學(xué)習(xí)態(tài)度，這種時(shí)候肯定是要自己肝出一個(gè)這樣的控件了，以下帶來實(shí)現(xiàn)的思路與具體過程

一、實(shí)現(xiàn)的思路

個(gè)人覺得自定義View肯定要整理自己的實(shí)現(xiàn)思路，只有思路清晰明確了，才能夠順利的實(shí)現(xiàn)自己所需的功能，以下淺淡一下，實(shí)現(xiàn)滑動(dòng)解鎖的具體思路：

1、滑動(dòng)解鎖方面，肻定要有一個(gè)按鈕與文本，按鈕只需要實(shí)現(xiàn)點(diǎn)擊滑過的功能，所以這邊我繼承了TextView免去文本的操作，其實(shí)繼承Button也是可以的，看個(gè)人的選擇
2、實(shí)現(xiàn)文本之后，還要有按鈕，想了下利用drawCircle實(shí)現(xiàn)不難，外邊的弧可以用drawRoundRect實(shí)現(xiàn)，剩下的就是控制文本、按鈕還有弧之間的距離了
3、實(shí)現(xiàn)之后上述功能后，就是要做點(diǎn)擊操作了，這邊可以重寫onTouchEvent，來實(shí)現(xiàn)這個(gè)滑動(dòng)的過程

思路整理完之后好像沒什么難度，開始擼代碼

二、先上成品圖

按鈕以圖片形式
[圖片上傳失敗...(image-532ee6-1597629394228)]
按鈕默認(rèn)模式
[圖片上傳失敗...(image-8b2262-1597629394228)]

三、自定義屬性

    <declare-styleable name="ButtonSliding">
        <!--        弧的顏色-->
        <attr name="boundColor" format="color"></attr>
        <!--        文本的顏色-->
        <attr name="mtextColor" format="color"></attr>
        <!--        按鈕是選擇圖片還是默認(rèn)的顏色按鈕形式，默認(rèn)是顏色，設(shè)置true之后需設(shè)置btnSrc-->
        <attr name="typeColor" format="boolean"/>
        <!--        按鈕的圖片或者顏色，只有在typeColor設(shè)置為true時(shí)有效-->
        <attr name="btnSrc" format="reference|color"></attr>

    </declare-styleable>

四、使用

    <com.example.test.Widget.ButtonSliding
        android:id="@+id/tv_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="滑動(dòng)進(jìn)入會(huì)議"
        android:textSize="24sp"
        android:visibility="visible"

        app:boundColor="@color/colorSkyBlue"
        app:mtextColor="#FFC107"
        app:typeColor="true"
        app:btnSrc="@mipmap/icon"

        app:layout_constraintBottom_toTopOf="@+id/btnTest"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        />

五、具體實(shí)現(xiàn)

package com.example.test.Widget;

import android.animation.ValueAnimator;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.MotionEvent;
import android.view.animation.BounceInterpolator;


import com.example.test.R;

/**
 * 滑動(dòng)進(jìn)入
 *
 * @author chen
 */
public class ButtonSliding extends androidx.appcompat.widget.AppCompatTextView {
    /**
     * 文本顏色畫筆
     */
    private Paint paintText;
    /**
     * 背景弧畫筆
     */
    private Paint paintRect;
    /**
     * 按鈕畫筆
     */
    private Paint paintCircle;
    private Context context;
    /**
     * 背景弧顏色
     */
    private int boundColor = Color.RED;
    /**
     * 文本弧顏色
     */
    private int mTextColor = Color.BLACK;

    private Bitmap bitmap;
    /**
     * 按鈕背景
     */
    private int drawableId;

    private boolean isColorSrc = true;

    public ButtonSliding(Context context, AttributeSet attrs) {
        super(context, attrs);
        this.context = context;
        TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.ButtonSliding);
        boundColor = typedArray.getColor(R.styleable.ButtonSliding_boundColor,boundColor);
        mTextColor = typedArray.getColor(R.styleable.ButtonSliding_boundColor,mTextColor);
        drawableId = typedArray.getResourceId(R.styleable.ButtonSliding_btnSrc, 0);
        isColorSrc = typedArray.getBoolean(R.styleable.ButtonSliding_typeColor, isColorSrc);
        if (isColorSrc) {

        } else {
            if(drawableId == 0)
                throw new IllegalArgumentException("資源設(shè)置null");
            bitmap = BitmapFactory.decodeResource(getResources(), drawableId);
        }


        typedArray.recycle();
        init();
    }

    /**
     * 初始化畫筆
     */
    private void init() {
        paintText = new Paint();
        paintText.setDither(true);
        paintText.setAntiAlias(true);
        paintText.setStyle(Paint.Style.FILL);
        paintText.setTextSize(getTextSize());
        paintText.setColor(mTextColor);

        paintRect = new Paint();
        paintRect.setDither(true);
        paintRect.setAntiAlias(true);
        paintRect.setColor(boundColor);
        paintRect.setStyle(Paint.Style.STROKE);
        paintRect.setStrokeWidth(pxToDp(2));

        paintCircle = new Paint();
        paintCircle.setDither(true);
        paintCircle.setAntiAlias(true);
        paintCircle.setStyle(Paint.Style.FILL);
        paintCircle.setStrokeWidth(pxToDp(2));
    }

    /**
     * 測量處理,默認(rèn)情況
     */
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        //獲取寬高的模式
        int widthMode = MeasureSpec.getMode(widthMeasureSpec);
        int heightMode = MeasureSpec.getMode(heightMeasureSpec);
        //指定寬高的大小
        int width = MeasureSpec.getSize(widthMeasureSpec);
        int height = MeasureSpec.getSize(heightMeasureSpec);
        //如果寬高設(shè)置為wrap_content時(shí)，剛默認(rèn)為300
        if (widthMode == MeasureSpec.AT_MOST || heightMode == MeasureSpec.AT_MOST) {
            height = 200;
            width = height * 4;
        }

        //如果寬高不一致時(shí)，則以高為標(biāo)準(zhǔn)
        if (width != height) {
            width = height * 4;
        }
        setMeasuredDimension(width, height);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        drawCircle(canvas);
        drawText(canvas);
//        drawButton(canvas);
        if (isColorSrc) {
            drawButton(canvas);
        } else {
            drawBitmap(canvas);
        }
    }

    /**
     * 按鈕X(left)與Y(top)的值
     */
    private int btnBitmapX;
    private int btnBitmapY;
    /**
     * 按鈕X(right)與Y(bottom)的值
     */
    private int btnBitmapX2;
    private int btnBitmapY2;

    /**
     * 繪制圖片的按鈕
     * @param canvas
     */
    private void drawBitmap(Canvas canvas) {

        RectF rectF = new RectF(btnBitmapX, btnBitmapY, btnBitmapX2, btnBitmapY2);
        Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());

        canvas.drawBitmap(bitmap, rect, rectF, paintCircle);
    }

    /**
     * 縮放圖片
     * @param bitmap
     * @param newWidth
     * @param newHeight
     * @return
     */
    public Bitmap getNewBitmap(Bitmap bitmap, int newWidth, int newHeight) {
        // 獲得圖片的寬高.
        int width = bitmap.getWidth();
        int height = bitmap.getHeight();
        // 計(jì)算縮放比例.
        float scaleWidth = ((float) newWidth) / width;
        float scaleHeight = ((float) newHeight) / height;
        // 取得想要縮放的matrix參數(shù).
        Matrix matrix = new Matrix();
        matrix.postScale(scaleWidth, scaleHeight);
        // 得到新的圖片.
        Bitmap newBitmap = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true);
        return newBitmap;
    }


    /**
     * 創(chuàng)建新的圓角圖片
     * @param bitmap
     * @param px
     * @return
     */
    public  Bitmap makeRoundCorner(Bitmap bitmap, int px)
    {
        int width = bitmap.getWidth();
        int height = bitmap.getHeight();
        Bitmap output = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(output);
        int color = 0xff424242;
        Paint paint = new Paint();
        Rect rect = new Rect(0, 0, width, height);
        RectF rectF = new RectF(rect);
        paint.setAntiAlias(true);
        canvas.drawARGB(0, 0, 0, 0);
        paint.setColor(color);
        canvas.drawRoundRect(rectF, px, px, paint);
        paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
        canvas.drawBitmap(bitmap, rect, rect, paint);
        return output;
    }

    /**
     * 繪制按鈕
     *
     * @param canvas
     */
    private void drawButton(Canvas canvas) {
        canvas.drawCircle(btnX, btnY, btnRadus, paintCircle);
    }

    /**
     * 繪制背景弧
     *
     * @param canvas
     */
    private void drawCircle(Canvas canvas) {


        RectF rectF = new RectF(x - x, y - y, x + x, y + y);

        canvas.drawRoundRect(rectF, 100, 100, paintRect);
    }

    private float pxToDp(int value) {
        return TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, value, context.getResources().getDisplayMetrics());
    }

    /**
     * 按鈕半徑
     */
    private int btnRadus;

    /**
     * 繪制文本
     *
     * @param canvas
     */
    private void drawText(Canvas canvas) {
        String text = (String) getText();
        //獲取文本的寬高
        Rect rect = new Rect();
        paintText.getTextBounds(text.trim(), 0, text.trim().length(), rect);
        int dx = getWidth() / 2 - rect.width() / 2 + btnRadus;
        Paint.FontMetrics fontMetrics = paintText.getFontMetrics();
        //基線
        float baseline = getHeight() / 2 + (fontMetrics.top - fontMetrics.bottom) / 2 - fontMetrics.top;
        //繪制文本
        canvas.drawText(text, dx, baseline, paintText);
    }

    /**
     * 中心點(diǎn)
     */
    private int y;
    private int x;
    /**
     * 按鈕中心點(diǎn)
     */
    private int btnX;
    private int btnY;
    /**
     * 按鈕與背景弧的間隙
     */
    private int btnBound = 10;

    /**
     * 背景的圖片
     */
    private int bitmapRadus;

    @Override
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
        //數(shù)值太多選擇在測量時(shí)初始化，在構(gòu)造函數(shù)時(shí)有些數(shù)值拿不到，draw刷新時(shí)又會(huì)被重新賦值，所以選擇在此初始化
        //初始化中心點(diǎn)
        x = (right - left) / 2;
        y = (bottom - top) / 2;
        //初始化中心點(diǎn)
        btnRadus = (y + y) / 2 - btnBound;
        //按鈕的X,Y
        btnX = btnRadus + btnBound;
        btnY = y;

        //按鈕圖片的X,Y
        btnBitmapX = btnBound;
        btnBitmapY = btnBound;

        btnBitmapX2 = btnRadus + btnRadus + btnBound;
        btnBitmapY2 = btnRadus + btnRadus + btnBound;
        //按鈕圖片與弧的間隙
        bitmapRadus = btnBitmapX2 - btnBitmapX;
        if(!isColorSrc){
            bitmap = getNewBitmap(bitmap, btnRadus + btnRadus, btnRadus + btnRadus);
            bitmap = makeRoundCorner(bitmap,100);
        }

        super.onLayout(changed, left, top, right, bottom);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        int X = (int)event.getX();
        switch (event.getAction()) {
            //手指移動(dòng)時(shí)
            case MotionEvent.ACTION_MOVE:

                if(isColorSrc){
                    btnX = (X) ;

                    //到達(dá)右端一定距離時(shí)調(diào)用接口
                    if (btnX >= x + x - btnBound - btnRadus - 5) {
                        buttonSildingEvent.onOver();
                    }
                    //如果超出控件范圍則不調(diào)用刷新
                    if (btnX >= x + x - btnBound - btnRadus || btnX <= btnRadus + btnBound)
                        break;
                    //如果在控件范圍則不調(diào)用刷新
                    if (btnX <= x + x - btnRadus - btnBound && btnX >= btnRadus + btnBound)
                        postInvalidate();
                }else {
                    btnBitmapX2 = (X);
                    //同上
                    if (btnBitmapX2 >= x + x  || btnBitmapX2 <= btnRadus + btnBound) {
                        break;
                    }
                    //同上

                    if (btnBitmapX2 >= x + x - btnBound - btnRadus - 5) {
                        buttonSildingEvent.onOver();
                    }
                    //同上

                    if (btnBitmapX2 <= x + x - btnRadus - btnBound && btnBitmapX2 >= btnRadus + btnBound)
                        postInvalidate();
                }

                break;

                //手指抬起時(shí)
            case MotionEvent.ACTION_UP:
                if(isColorSrc){
                    btnX = (X);
                    //如果超出控件邊界，則給定默認(rèn)值
                    if (btnX > x + x - btnRadus)
                        btnX = x + x - btnRadus;
                    //如果超出控件邊界，則給定默認(rèn)值
                    if (btnX < btnRadus + btnBound)
                        btnX = btnRadus + btnBound;
                    reset(btnX);

                }else {
                    btnBitmapX2 = (X);
                    btnBitmapX = (X) - bitmapRadus;
                    //同上
                    if (btnBitmapX2 > x + x - btnRadus)
                        btnBitmapX2 = x + x - btnRadus;
                    //同上
                    if (btnBitmapX2 < btnRadus + btnBound)
                        btnBitmapX2 = btnRadus + btnBound;

                    reset(btnBitmapX2);

                }

                break;
        }
        return true;
    }

    /**
     * 松手回彈
     */
    private void reset(int start) {
        ValueAnimator valueAnimator = ValueAnimator.ofInt(start, btnRadus + btnBound);
        valueAnimator.setDuration(1000);
        valueAnimator.setInterpolator(new BounceInterpolator());
        valueAnimator.start();
        valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                if(isColorSrc){
                    //X的值，Y不用管
                    btnX = (int) animation.getAnimatedValue();

                }else {
                    //圖片是由Rect決定繪制圖片的位置，所以要賦值X與X2
                    btnBitmapX2 = (int) animation.getAnimatedValue();
                    btnBitmapX = (int) animation.getAnimatedValue() - bitmapRadus;

                    if(btnBitmapX <= 0){
                        btnBitmapX = btnBound;
                        btnBitmapX2 = btnRadus + btnRadus + btnBound;
                    }
                }
                //刷新
                invalidate();
            }
        });
    }

    private ButtonSildingEvent buttonSildingEvent;

    /**
     * 設(shè)置完成的監(jiān)聽
     * @param buttonSilding
     */
    public void setOnListener(ButtonSildingEvent buttonSilding) {
        this.buttonSildingEvent = buttonSilding;
    }

    /**
     * 按鈕滑動(dòng)到右端的接口
     */
    public interface ButtonSildingEvent {
        void onOver();
    }
}

CSDN地址：Android自定義View-滑動(dòng)解鎖按鈕