android怎么模拟实现航拍遥控

本文小编为大家详细介绍“android怎么模拟实现航拍遥控”，内容详细，步骤清晰，细节处理妥当，希望这篇“android怎么模拟实现航拍遥控”文章能帮助大家解决疑惑，下面跟着小编的思路慢慢深入，一起来学习新知识吧。

先贴图

左右两个点，在圈内活动，一个是控制油门，一个是控制方向，放手后会返回中心点，这些在游戏场景中经常看到，比如射击类的游戏，这里自定义view，继承ImageView，难点就在手指控制这部分，以下是源码。

package&nbsp.remotecontrol;importandroid.annotation.TargetApi;importandroid.content.Context;importandroid.graphics.Bitmap;importandroid.graphics.BitmapFactory;importandroid.graphics.Canvas;importandroid.graphics.Matrix;importandroid.graphics.Point;importandroid.graphics.Rect;importandroid.os.Build;importandroid.util.AttributeSet;importandroid.util.DisplayMetrics;importandroid.view.MotionEvent;importandroid.view.WindowManager;importandroid.widget.ImageView;/***Createdbyqingyuanon2023/5/20.*自定义view模拟遥控器*/publicclassRemoteControlextendsImageView{publicfinalStringTAG="RemoteControl";publicRemoteControl(Contextcontext){super(context);InitData(context);}publicRemoteControl(Contextcontext,AttributeSetattrs){super(context,attrs);InitData(context);}publicRemoteControl(Contextcontext,AttributeSetattrs,intdefStyleAttr){super(context,attrs,defStyleAttr);InitData(context);}@TargetApi(Build.VERSION_CODES.LOLLIPOP)publicRemoteControl(Contextcontext,AttributeSetattrs,intdefStyleAttr,intdefStyleRes){super(context,attrs,defStyleAttr,defStyleRes);InitData(context);}DisplayMetricsdm=newDisplayMetrics();WindowManagermanager;//屏幕的宽跟高intmDisplayWidth;intmDisplayWidth_2;//屏幕宽的1/2intmDisplayWidth_4;//屏幕宽的1/4intmDisplayWidth_43;//屏幕宽的3/4intmDisplayHeight;intmDisplayHeight_2;//屏幕高的1/2intmDisplayHeight_4;//屏幕高的1/4intmDisplayHeight_43;//屏幕高的3/4PointleftCenter;//左边中点的坐标PointrightCenter;//右边中点的坐标/********************右边的底图**************************/Bitmapbtm_bg;RectrectSrc_bg;RectrectDst_bg;/********************左边的底图**************************/Bitmapbtm_bar;RectrectSrc_bar;RectrectDst_bar;/********************左边的圆点**************************/Bitmapbtm_circle_left;MyPointleftPoint;doubleleftDistance;//距离中心点的距离doubleleftAngle;//atan2的角度值intleftCircle_2;//圆的一半/********************右边的圆点**************************/Bitmapbtm_circle_right;MyPointrightPoint;doublerightDistance;//距离中心点的距离doublerightAngle;//atan2的角度值intrightCircle_2;//圆的一半intstopRadius;//圆的半径,左右的半径是一样的Matrixmatrix;//矩阵，同过改变矩阵来改变bitmap的位置finaldoubledegToRad=Math.PI/180.0;finaldoubleradToDeg=180.0/Math.PI;publicvoidInitData(Contextcontext){manager=(WindowManager)context.getSystemService(Context.WINDOW_SERVICE);manager.getDefaultDisplay().getMetrics(dm);mDisplayWidth=dm.widthPixels;mDisplayHeight=dm.heightPixels;mDisplayWidth_2=mDisplayWidth/2;//屏幕宽的1/2mDisplayWidth_4=mDisplayWidth/4;//屏幕宽的1/4mDisplayWidth_43=mDisplayWidth*3/4;//屏幕宽的3/4mDisplayHeight_2=mDisplayHeight/2;//屏幕高的1/2mDisplayHeight_4=mDisplayHeight/4;//屏幕高的1/4mDisplayHeight_43=mDisplayHeight*3/4;//屏幕高的3/4btm_bg=BitmapFactory.decodeResource(context.getResources(),R.drawable.control_bg);btm_circle_left=BitmapFactory.decodeResource(context.getResources(),R.drawable.records);btm_circle_right=BitmapFactory.decodeResource(context.getResources(),R.drawable.help);btm_bar=BitmapFactory.decodeResource(context.getResources(),R.drawable.shift_bar_bg);matrix=newMatrix();floatscaleSize=(float)(mDisplayHeight*1.0/btm_bg.getWidth()*0.65f);//缩放为屏幕的0.65matrix.postScale(scaleSize,scaleSize);btm_bg=Bitmap.createBitmap(btm_bg,0,0,btm_bg.getWidth(),btm_bg.getHeight(),matrix,true);btm_bar=Bitmap.createBitmap(btm_bar,0,0,btm_bar.getWidth(),btm_bar.getHeight(),matrix,true);btm_circle_left=Bitmap.createBitmap(btm_circle_left,0,0,btm_circle_left.getWidth(),btm_circle_left.getHeight(),matrix,true);btm_circle_right=Bitmap.createBitmap(btm_circle_right,0,0,btm_circle_right.getWidth(),btm_circle_right.getHeight(),matrix,true);leftCircle_2=btm_circle_left.getWidth()/2;rightCircle_2=btm_circle_right.getWidth()/2;//左边中心点的位置设为leftCenter=newPoint();leftCenter.set(mDisplayWidth_4,mDisplayHeight_2);//右边中心点的位置设为rightCenter=newPoint();rightCenter.set(mDisplayWidth_43,mDisplayHeight_2);/***********************左边的地图位置***************************/rectSrc_bar=newRect(0,0,btm_bar.getWidth(),btm_bar.getHeight());rectDst_bar=newRect(leftCenter.x-btm_bg.getWidth()/2,leftCenter.y-btm_bg.getHeight()/2,leftCenter.x+btm_bg.getWidth()/2,leftCenter.y+btm_bg.getHeight()/2);/***********************左边的圆点位置***************************/leftPoint=newMyPoint(leftCenter.x,leftCenter.y);/***********************右边的圆底图位置***************************/rectSrc_bg=newRect(0,0,btm_bg.getWidth(),btm_bg.getHeight());rectDst_bg=newRect(rightCenter.x-btm_bar.getWidth()/2,rightCenter.y-btm_bar.getHeight()/2,rightCenter.x+btm_bar.getWidth()/2,rightCenter.y+btm_bar.getHeight()/2);/***********************右边边的圆点位置***************************/rightPoint=newMyPoint(rightCenter.x,rightCenter.y);//半径为底图的一半，这里决定了可移动圆的大小stopRadius=btm_bg.getWidth()/2;}@OverrideprotectedvoidonDraw(Canvascanvas){super.onDraw(canvas);canvas.drawBitmap(btm_bg,rectSrc_bg,rectDst_bg,null);canvas.drawBitmap(btm_bar,rectSrc_bar,rectDst_bar,null);//更新的左中心点的位置matrix.reset();matrix.postTranslate(leftPoint.x-leftCircle_2,leftPoint.y-leftCircle_2);canvas.drawBitmap(btm_circle_left,matrix,null);//更新的右中心点的位置matrix.reset();matrix.postTranslate(rightPoint.x-rightCircle_2,rightPoint.y-rightCircle_2);canvas.drawBitmap(btm_circle_right,matrix,null);}@TargetApi(Build.VERSION_CODES.ECLAIR)@OverridepublicbooleanonTouchEvent(MotionEventevent){floatx;floaty;doubledistance;//圆点离中心点的距离doubleangle;//圆点tan2的角度floatx2;floaty2;doubleangle2;doubledistance2;switch(MotionEvent.ACTION_MASK&event.getAction()){caseMotionEvent.ACTION_DOWN://判断第一个手指按下的位置所在的区域if(Math.abs(event.getX()-rightPoint.x)<btm_circle_right.getWidth()&&Math.abs(event.getY()-rightPoint.y)<btm_circle_right.getHeight()){rightPoint.setPointerIndex(0);rightPoint.setCanMove(true);}elseif(Math.abs(event.getX()-leftPoint.x)<btm_circle_left.getWidth()&&Math.abs(event.getY()-leftPoint.y)<btm_circle_left.getHeight()){leftPoint.setPointerIndex(0);leftPoint.setCanMove(true);}break;caseMotionEvent.ACTION_POINTER_UP://获取离开手指的idintpointerId=(event.getAction()&MotionEvent.ACTION_POINTER_ID_MASK)>>>MotionEvent.ACTION_POINTER_ID_SHIFT;//根据手指离开的id判断是开了的是哪个移动的点if(rightPoint.isCanMove()&&rightPoint.getPointerIndex()==pointerId){rightPoint.setCanMove(false);//手指离开让圆点返回中心点rightPoint.x=rightCenter.x;rightPoint.y=rightCenter.y;rightPoint.setPointerIndex(-1);}if(leftPoint.isCanMove()&&leftPoint.getPointerIndex()==pointerId){leftPoint.setCanMove(false);leftPoint.x=leftCenter.x;leftPoint.y=rightCenter.y;leftPoint.setPointerIndex(-1);}break;caseMotionEvent.ACTION_UP://全部手指离开之后rightPoint.setCanMove(false);rightPoint.x=rightCenter.x;rightPoint.y=rightCenter.y;rightPoint.setPointerIndex(0);leftPoint.setCanMove(false);leftPoint.x=leftCenter.x;leftPoint.y=leftCenter.y;leftPoint.setPointerIndex(0);break;caseMotionEvent.ACTION_POINTER_DOWN://获取第二根手指的idpointerId=(event.getAction()&MotionEvent.ACTION_POINTER_ID_MASK)>>>MotionEvent.ACTION_POINTER_ID_SHIFT;//第二根手指按下if(!rightPoint.isCanMove()&&Math.abs(event.getX(pointerId)-rightPoint.x)<btm_circle_right.getWidth()&&Math.abs(event.getY(pointerId)-rightPoint.y)<btm_circle_right.getHeight()){rightPoint.setPointerIndex(pointerId);rightPoint.setCanMove(true);}elseif(!leftPoint.isCanMove()&&Math.abs(event.getX(pointerId)-leftPoint.x)<btm_circle_left.getWidth()&&Math.abs(event.getY(pointerId)-leftPoint.y)<btm_circle_left.getHeight()){leftPoint.setPointerIndex(pointerId);leftPoint.setCanMove(true);}break;caseMotionEvent.ACTION_MOVE://如果是单指移动if(event.getPointerCount()==1){if(rightPoint.isCanMove()){x=event.getX(0)-rightCenter.x;y=event.getY(0)-rightCenter.y;//计算角度，atan2的用法自己百度咯angle=(Math.atan2(x,y)*radToDeg)-90;distance=Math.sqrt((x*x)+(y*y));//判断是不是超出了规定的半径长度if(distance>=stopRadius){distance=stopRadius;doubleradAngle=angle*degToRad;rightPoint.x=(int)(distance*Math.cos(radAngle))+rightCenter.x;rightPoint.y=(int)(-distance*Math.sin(radAngle))+rightCenter.y;}else{rightPoint.x=(int)event.getX(0);rightPoint.y=(int)event.getY(0);}rightDistance=distance;rightAngle=angle;}elseif(leftPoint.isCanMove()){x=event.getX(0)-leftCenter.x;y=event.getY(0)-leftCenter.y;angle=(Math.atan2(x,y)*radToDeg)-90;distance=Math.sqrt((x*x)+(y*y));if(distance>=stopRadius){distance=stopRadius;doubleradAngle=angle*degToRad;leftPoint.x=(int)(distance*Math.cos(radAngle))+leftCenter.x;leftPoint.y=(int)(-distance*Math.sin(radAngle))+leftCenter.y;}else{leftPoint.x=(int)event.getX(0);leftPoint.y=(int)event.getY(0);}}}else{//双指移动if(rightPoint.isCanMove()&&rightPoint.getPointerIndex()!=-1&&rightPoint.getPointerIndex()<event.getPointerCount()){x=event.getX(rightPoint.getPointerIndex())-rightCenter.x;y=event.getY(rightPoint.getPointerIndex())-rightCenter.y;angle=(Math.atan2(x,y)*radToDeg)-90;distance=Math.sqrt((x*x)+(y*y));if(distance>=stopRadius){distance=stopRadius;doubleradAngle=angle*degToRad;rightPoint.x=(int)(distance*Math.cos(radAngle))+rightCenter.x;rightPoint.y=(int)(-distance*Math.sin(radAngle))+rightCenter.y;}else{rightPoint.x=(int)event.getX(rightPoint.getPointerIndex());rightPoint.y=(int)event.getY(rightPoint.getPointerIndex());}rightDistance=distance;rightAngle=angle;}if(leftPoint.isCanMove()&&leftPoint.getPointerIndex()!=-1&&leftPoint.getPointerIndex()<event.getPointerCount()){x2=event.getX(leftPoint.getPointerIndex())-leftCenter.x;y2=event.getY(leftPoint.getPointerIndex())-leftCenter.y;angle2=(Math.atan2(x2,y2)*radToDeg)-90;distance2=Math.sqrt((x2*x2)+(y2*y2));if(distance2>=stopRadius){distance2=stopRadius;doubleradAngle=angle2*degToRad;leftPoint.x=(int)(distance2*Math.cos(radAngle))+leftCenter.x;leftPoint.y=(int)(-distance2*Math.sin(radAngle))+leftCenter.y;}else{leftPoint.x=(int)event.getX(leftPoint.getPointerIndex());leftPoint.y=(int)event.getY(leftPoint.getPointerIndex());}leftDistance=distance2;leftAngle=angle2;}}break;}invalidate();returntrue;}publicdoublegetRightDistance(){returnrightDistance;}publicdoublegetRightAngle(){returnrightAngle;}publicdoublegetLeftAngle(){returnleftAngle;}publicdoublegetLeftDistance(){returnleftDistance;}/***自定义坐标点，添加了两个属性*/publicclassMyPointextendsPoint{//手指的indexprivateintpointerIndex=-1;//是否能移动privatebooleanisCanMove;publicbooleanisCanMove(){returnisCanMove;}publicvoidsetCanMove(booleancanMove){isCanMove=canMove;}publicMyPoint(intx,inty){super(x,y);}publicintgetPointerIndex(){returnpointerIndex;}publicvoidsetPointerIndex(intpointerIndex){this.pointerIndex=pointerIndex;}}}

在我的真正项目中对内存性能要求比较高，所有我并没有直接用继承ImageView，而是使用了SurfaceView,双缓冲，单独线程刷新画面，还有局部刷新，基本上跟上面的差不多，只是将onDraw（）里面的刷新代码放到SurfaceView中，网上也有很多SurfaceView使用的例子，稍微借鉴一下就能转过来。

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