Android Studio中实现摇杆

概述今天和大家分享一下AndroidStudio实现摇杆，原理很简单，代码中有对应的注释。实现效果图实现代码packagecom.example.fragmentcar1.view;importandroid.content.Context;importandroid.graphics.Canvas;importandroid.graphics.Color;importandroid.graphics.P

今天和大家分享一下AndroID Studio实现摇杆，原理很简单，代码中有对应的注释。@H_419_6@实现效果图

@H_419_6@

@H_419_6@@H_419_6@实现代码

package com.example.fragmentcar1.vIEw;import androID.content.Context;import androID.graphics.Canvas;import androID.graphics.color;import androID.graphics.Paint;import androID.graphics.RectF;import androID.util.AttributeSet;import androID.vIEw.MotionEvent;import androID.vIEw.VIEw;import androIDx.annotation.Nullable;/** * 摇杆视图 */public class RemoteVIEw extends VIEw {    Paint backPaint = new Paint();//背景画笔    Paint bubblePaint = new Paint();//气泡画笔    Paint rectfPaint = new Paint();    /**     * 气泡的位置     */    float bubbleX = 300, bubbleY = 300;    /**     * 背景圆的位置     */    float backX = 300, backY = 300;    /**     * 气泡和背景的半径     */    int radiusBack = 200, radiusBubble = 100;    RectF mRectF = new RectF(backX-radiusBack,backY-radiusBack,backX+radiusBack,backY+radiusBack);    Context mContext;    /**     * Stop  停止     * RETURN 后退     * left 左转     * RIGHT 右转     * GO 前进     * 默认为停止     */    String orIEntation="Stop";    public RemoteVIEw(Context context, @Nullable AttributeSet attrs) {        super(context, attrs);        this.mContext = context;    }    @OverrIDe    protected voID onDraw(Canvas canvas) {        super.onDraw(canvas);        initPaint();        canvas.drawCircle(backX, backY, radiusBack, backPaint);        if (orIEntation=="GO") {            canvas.drawArc(mRectF, -45, -90, true, rectfPaint);        }else if (orIEntation=="RETURN"){            canvas.drawArc(mRectF, 45, 90, true, rectfPaint);        }else if (orIEntation=="left"){            canvas.drawArc(mRectF, 135, 90, true, rectfPaint);        }else if (orIEntation=="RIGHT"){            canvas.drawArc(mRectF, -45, 90, true, rectfPaint);        }else if (orIEntation=="Stop"){            rectfPaint.setAlpha(0);            canvas.drawArc(mRectF, -90, 360, true, rectfPaint);        }        canvas.drawCircle(bubbleX, bubbleY, radiusBubble, bubblePaint);    }    private voID initPaint() {        backPaint.setAntiAlias(true);        backPaint.setcolor(color.parsecolor("#60ffffff"));        bubblePaint.setAntiAlias(true);        bubblePaint.setcolor(color.parsecolor("#90ffffff"));        rectfPaint.setAntiAlias(true);        rectfPaint.setcolor(color.parsecolor("#ffffff"));        rectfPaint.setAlpha(144);    }    @OverrIDe    public boolean ontouchEvent(MotionEvent event) {        switch (event.getAction()) {            case MotionEvent.ACTION_MOVE:                float x = (int) event.getX();                float y = (int) event.getY();                if (getdistance(x, y, backX, backY) < radiusBack) {                    bubbleX = x;                    bubbleY = y;                } else if (getdistance(x, y, backX, backY) >= radiusBack) {                    float xAndy[];                    xAndy = getXY(x, y, backX, backY, getdistance(x, y, backX, backY));                    bubbleX = xAndy[0];                    bubbleY = xAndy[1];                    getorIEntation(x,y);                }                break;            case MotionEvent.ACTION_UP:                bubbleX = backX;                bubbleY = backY;                orIEntation="Stop";                break;        }        invalIDate();        return true;    }    /**     * 得到手指触控点与圆点中心的距离     *     * @param x1     * @param y1     * @param x2     * @param y2     * @return     */    private float getdistance(float x1, float y1, float x2, float y2) {        float dis;        dis = (float) Math.sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2));        return dis;    }    /**     * 当手指触控点在大圆外面时     * 需要重新得到气泡的位置     *     * @param x1     * @param y1     * @param x2     * @param y2     * @param dis     * @return     */    private float[] getXY(float x1, float y1, float x2, float y2, float dis) {        float[] xAndy = new float[2];        float scaledis;        float xdis;        float ydis;        /**         * 表示在第一象限之内         */        if (x1 > x2 && y1 < y2) {            scaledis = radiusBack / dis;            xdis = Math.abs(x1 - x2);            ydis = Math.abs(y1 - y2);            xAndy[0] = x2 + xdis * scaledis;            xAndy[1] = y2 - ydis * scaledis;        }        /**         * 表示在第二象限之内         */        else if (x1 < x2 && y1 < y2) {            scaledis = radiusBack / dis;            xdis = Math.abs(x1 - x2);            ydis = Math.abs(y1 - y2);            xAndy[0] = x2 - xdis * scaledis;            xAndy[1] = y2 - ydis * scaledis;        }        /**         *表示在第三象限之内         */        else if (x1 < x2 && y1 > y2) {            scaledis = radiusBack / dis;            xdis = Math.abs(x1 - x2);            ydis = Math.abs(y1 - y2);            xAndy[0] = x2 - xdis * scaledis;            xAndy[1] = y2 + ydis * scaledis;        }        /**         * 表示在第四象限之内         */        else if (x1 > x2 && y1 > y2) {            scaledis = radiusBack / dis;            xdis = Math.abs(x1 - x2);            ydis = Math.abs(y1 - y2);            xAndy[0] = x2 + xdis * scaledis;            xAndy[1] = y2 + ydis * scaledis;        }        /**         * 角度为零度         */        else if (x1 > x2 && y1 == y2) {            xAndy[0] = x2 + radiusBack;            xAndy[1] = y2;        }        /**         * 角度为90度         */        else if (x1 == x2 && y1 < y2) {            xAndy[0] = x2;            xAndy[1] = y2 - radiusBack;        }        /**         * 角度为180度         */        else if (x1 < x2 && y1 == y2) {            xAndy[0] = x2 - radiusBack;            xAndy[1] = y2;        }        /**         * 表示为270度         */        else if (x1 == x2 && y1 > y2) {            xAndy[0] = x2;            xAndy[1] = y2 + radiusBack;        }        return xAndy;    }    /**     * 更具摇杆 *** 作的方向来控制小车的运动方向     */    private voID getorIEntation(float x,float y){        if (y<backY&&(x<backX+backX*0.707&&x>backY-backY*0.707)){             orIEntation = "GO";        }else if (x>backX&&(y<backY+backY*0.707&&y>backY-backY*0.707)){            orIEntation="RIGHT";        }else if (y>backY&&(x<backX+backX*0.707&&x>backY-backY*0.707)){            orIEntation="RETURN";        }else if (x<backX&&(y<backY+backY*0.707&&y>backY-backY*0.707)){            orIEntation="left";        }else {            orIEntation="Stop";        }    }}

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