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这篇文章给大家分享的是有关Android如何自定义view实现车载可调整轨迹线的内容。小编觉得挺实用的，因此分享给大家做个参考，一起跟随小编过来看看吧。
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具体内容如下
同事做的view，拿过来做个记录。
/** * */package com.text.myviewdemo.view; import org.apache.http.conn.routing.RouteInfo.LayerType; import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.DashPathEffect;import android.graphics.Paint;import android.graphics.PorterDuff;import android.graphics.PorterDuffXfermode;import android.graphics.Xfermode;import android.graphics.PorterDuff.Mode;import android.util.AttributeSet;import android.util.Log;import android.view.MotionEvent;import android.view.View; /** * @author chenhanrong * */public class CCView extends View implements android.view.View.OnClickListener{ private Paint paint; private float[] line_r,line_l,line_1,line_2,line_3,line_t;// private float line1YL,line1YR,line2YL,line2YR,line3YL,line3YR; public Context context; private float radiu; private boolean showPoint = false; private boolean cmP1=false; private boolean cmP2=false; private boolean cmP3=false; private boolean cmP4=false; private boolean cmP5=false; private boolean cmP6=false; private boolean cmP7=false; private boolean cmP8=false; private boolean cmP9=false; private boolean cmP10=false; private boolean isfirst = true; private boolean isMove = false; public final static int D_LEFT =0; public final static int D_RIGHT =1; public final static int TYPE_MIN =0; public final static int TYPE_MAX =1; public CCView(Context context) { this(context,null); } public CCView(Context context, AttributeSet attrs) { this(context,attrs,0); } public CCView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); this.context = context; init(); } /** * 初始化控件 */ private void init() { paint = new Paint(); /** * 去锯齿 */ paint.setAntiAlias(true); /** * 设置paint的颜色 */ paint.setColor(Color.RED); /** * 设置paint的 style */ paint.setStyle(Paint.Style.FILL); /** * 设置paint的外框宽度 */ paint.setStrokeWidth(10); setOnClickListener(this); setOnTouchListener(new OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { return false; } }); setLayerType(LAYER_TYPE_HARDWARE, paint); radiu = 20f; } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); canvas.drawColor(0x00000000, PorterDuff.Mode.CLEAR);// paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OVER)); if(isfirst){ line_l = new float[]{getWidth()/4,getHeight()/4,getWidth()/8,getHeight()}; line_r = new float[]{3*getWidth()/4, getHeight()/4,7*getWidth()/8, getHeight()}; line_1 = new float[]{getPointX(line_l, line_l[1]*2f),line_l[1]*2f,getPointX(line_r, line_r[1]*2f), line_r[1]*2f}; line_2 = new float[]{getPointX(line_l, line_l[1]*2.5f), line_l[1]*2.5f, getPointX(line_r, line_r[1]*2.5f), line_r[1]*2.5f}; line_3 = new float[]{getPointX(line_l, line_l[1]*3f), line_l[1]*3f, getPointX(line_r, line_r[1]*3f), line_r[1]*3f}; isfirst = false; } int canvasWidth = canvas.getWidth(); int canvasHeight = canvas.getHeight(); int layerId = canvas.saveLayer(0, 0, canvasWidth, canvasHeight, null, Canvas.ALL_SAVE_FLAG);// paint.setXfermode(new PorterDuffXfermode(Mode.DST_OVER)); line_t = new float[]{getPointX(line_l, line_l[1]), line_l[1], getPointX(line_r, line_r[1]), line_r[1]}; if(showPoint){ //四条横线 canvas.drawLines(line_t, paint); paint.setPathEffect(new DashPathEffect(new float[] {20, 5}, 0)); canvas.drawLines(line_1, paint); paint.setColor(Color.GREEN); canvas.drawLines(line_2, paint); paint.setColor(Color.YELLOW); canvas.drawLines(line_3, paint); paint.setColor(Color.RED); paint.setPathEffect(null); //左右两边线 canvas.drawLines(line_l, paint); canvas.drawLines(line_r, paint); //中间三条横线交点 canvas.drawCircle(line_1[0], line_1[1],radiu, paint); canvas.drawCircle(line_1[2], line_1[3],radiu, paint); paint.setColor(Color.GREEN); canvas.drawCircle(line_2[0], line_2[1],radiu, paint); canvas.drawCircle(line_2[2], line_2[3],radiu, paint); paint.setColor(Color.YELLOW); canvas.drawCircle(line_3[0], line_3[1],radiu, paint); canvas.drawCircle(line_3[2], line_3[3],radiu, paint); paint.setColor(Color.RED); //左右四点 canvas.drawCircle(line_l[0], line_l[1],radiu, paint); canvas.drawCircle(line_l[2], line_l[3],radiu, paint); canvas.drawCircle(line_r[0], line_r[1],radiu, paint); canvas.drawCircle(line_r[2], line_r[3],radiu, paint); }else{ float lf=getDashLineLength(D_LEFT); float rf=getDashLineLength(D_RIGHT); canvas.drawLines(line_t, paint); paint.setPathEffect(new DashPathEffect(new float[] {20, 5}, 0)); canvas.drawLine(line_1[0],line_1[1],lf,getPointY(line_1, lf), paint); canvas.drawLine(rf,getPointY(line_1, rf),line_1[2],line_1[3], paint); paint.setColor(Color.GREEN); canvas.drawLine(line_2[0],line_2[1],lf,getPointY(line_2, lf), paint); canvas.drawLine(rf,getPointY(line_2, rf),line_2[2],line_2[3], paint); paint.setColor(Color.YELLOW); canvas.drawLine(line_3[0],line_3[1],lf,getPointY(line_3, lf), paint); canvas.drawLine(rf,getPointY(line_3, rf),line_3[2],line_3[3], paint); paint.setPathEffect(null); paint.setColor(Color.RED); //左右两边线 canvas.drawLines(line_l, paint); canvas.drawLines(line_r, paint); canvas.drawCircle(line_l[0], line_l[1],paint.getStrokeWidth()/2, paint); canvas.drawCircle(line_r[0], line_r[1],paint.getStrokeWidth()/2, paint); }// paint.setStyle(Paint.Style.STROKE); paint.setColor(Color.RED); paint.setPathEffect(null); paint.setXfermode(null); canvas.restoreToCount(layerId); } /** * 获取坐标x * @param line 直线坐标系 * @param y y点 * @return */ private float getPointX(float[] line,float y){ float x = 0;// Log.d("chr", "line====>"+line.length+":::y====>"+y); float x1 = line[0]; float y1 = line[1]; float x2 = line[2]; float y2 = line[3]; x = ((y-y1)/(y2-y1))*(x2-x1)+x1; return x; } /** * 获取坐标y * @param line:直线坐标系 * @param x:x点 * @return */ private float getPointY(float[] line,float x){ float y = 0;// Log.d("chr", "line====>"+line.length+":::y====>"+y); float x1 = line[0]; float y1 = line[1]; float x2 = line[2]; float y2 = line[3]; y = ((x-x1)/(x2-x1))*(y2-y1)+y1; return y; } /** * 获取点应该移动到的Y坐标 * @param line:线段坐标 * @param y:滑动时的y坐标 * @return */ private float getMoveY(float[] line,float y){ if(y<=line[1]+ radiu){ y=line[1]+radiu*2.0f; } if(y>=line[3]-radiu*2.0f){ y=line[3]-radiu*2.0f; } return y; } /** * * @param direction 获取虚线长度 * @return */ private float getDashLineLength(int direction){ float length = 0; int a = 20; switch (direction) { case D_LEFT: length = line_t[0]+(line_t[2]-line_t[0])/a; break; case D_RIGHT: length = line_t[0]+(a-1)*(line_t[2]-line_t[0])/a; break; } return length; } /** * 获取最小值 * @return */ private float getMinPoint(float point[]){ float min = point[0]; for(int i=0;i
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