前言
本文主要给大家介绍的是关于AndroID自定义view实现游戏摇杆键盘的相关内容,为什么会有这篇文章呢?因为在之前的一个项目, *** 作方向的方式为上下左右,左上需要同时按住左键和右键的方式进行 *** 作。
如下图:
近来需要升级项目, *** 作方式改为类似王者荣耀的摇杆 *** 作。
如下图:
好了,下面话不多说了,跟着小编来一起看看是如何实现的吧。
绘制背景
实现遥感按钮,需要绘制背景,绘制中心的遥感按钮。绘制遥感背景,需要创建一个RemoteVIEwBg类,存储背景图,减少重复创建bitmap。
RemoteVIEwBg类代码如下:
public class RemoteVIEwBg {private Bitmap bitmapBg;public RemoteVIEwBg(Bitmap bitmap) { bitmapBg = bitmap;}//背景的绘图函数public voID draw(Canvas canvas,Paint paint,Rect src0,Rect dst0 ) { canvas.drawBitmap(bitmapBg,src0,dst0,paint);}}
点击触摸事件
重写系统的触摸时间,判断触摸点在背景范围内还是背景范围外
@OverrIDepublic boolean ontouchEvent(MotionEvent event) { if (event.getAction() == MotionEvent.ACTION_DOWN || event.getAction() == MotionEvent.ACTION_MOVE) { // // 在范围外触摸 if (Math.sqrt(Math.pow((bigCircleX - (int) event.getX()),2) + Math.pow((bigCircleY - (int) event.getY()),2)) >= bigCircleR) { double tempRad = geTrad(bigCircleX,bigCircleY,event.getX(),event.getY()); getXY(bigCircleX,bigCircleR,tempRad); } else {//范围内触摸 smallCircleX = (int) event.getX(); smallCircleY = (int) event.getY(); } } else if (event.getAction() == MotionEvent.ACTION_UP) { smallCircleX = bigCircleX; smallCircleY = bigCircleY; } return true;}
弧度计算
通过 event.getX()
,event.getY()
获得当前的触摸点,与圆点进行计算,获取弧度
/*** * 得到两点之间的弧度 */public float geTrad(float px1,float py1,float px2,float py2) { float x = px2 - px1; float y = py1 - py2; //斜边的长 float z = (float) Math.sqrt(Math.pow(x,2) + Math.pow(y,2)); float cosAngle = x / z; float rad = (float) Math.acos(cosAngle); if (py2 < py1) { rad = -rad; } return rad;}
图形绘制
通过 canvas.drawCircle()
和 canvas.drawBitmap()
分别进行遥感按钮和遥感背景的绘制,注意对遥感背景的保存,如果在绘制的时候每次BitmapFactory.decodeResource()
会增加耗时,因此只需在surfaceCreated()
中进行bitmap的生成即可。
public voID draw() { try { canvas = sfh.lockCanvas(); canvas.drawcolor(getResources().getcolor(R.color.ghostwhite)); // 指定图片绘制区域(左上角的四分之一) Rect src = new Rect(0,bitmap.getWIDth(),bitmap.getHeight()); // 指定图片在屏幕上显示的区域 Rect dst = new Rect(bigCircleX - bigCircleR,bigCircleY - bigCircleR,bigCircleX + bigCircleR,bigCircleY + bigCircleR); // 绘制图片 remoteVIEwBg.draw(canvas,paint,src,dst); paint.setcolor(0x70ff0000); //绘制摇杆 canvas.drawCircle(smallCircleX,smallCircleY,smallCircleR,paint); } catch (Exception e) { // Todo: handle exception } finally { try { if (canvas != null) sfh.unlockCanvasAndPost(canvas); } catch (Exception e2) { e2.printstacktrace(); } }}
使用
在activity中动态添加
relativeLayout relativeLayout = (relativeLayout) findVIEwByID(R.ID.dance_relative_layout); remoteSurfaceVIEw = new RemoteSurfaceVIEw(this); params = new relativeLayout.LayoutParams(relativeLayout.LayoutParams.MATCH_PARENT,relativeLayout.LayoutParams.MATCH_PARENT); remoteSurfaceVIEw.setLayoutParams(params); relativeLayout.addVIEw(remoteSurfaceVIEw);
全部代码
public class RemoteSurfaceVIEw extends SurfaceVIEw implements Callback,Runnable {private float scale = this.getResources().getdisplayMetrics().density;private Thread th;private SurfaceHolder sfh;private Canvas canvas;private Paint paint;private boolean flag;private int bigCircleX = 0;private int bigCircleY =0;private int bigCircleR = 0;//摇杆的X,Y坐标以及摇杆的半径private float smallCircleX = 0;private float smallCircleY = 0;private float smallCircleR = 0;private Bitmap bitmap;private RemoteVIEwBg remoteVIEwBg;public RemoteSurfaceVIEw(Context context) { super(context); sfh = this.getHolder(); sfh.addCallback(this); paint = new Paint(); paint.setAntiAlias(true); setFocusable(true); setFocusableIntouchMode(true); setZOrderOntop(true); getHolder().setFormat(PixelFormat.transparent);}public voID surfaceCreated(SurfaceHolder holder) { int wIDth = getWIDth(); int height = getHeight(); bigCircleX = wIDth / 2; bigCircleY = height / 2; bigCircleR = wIDth / 4; smallCircleX = wIDth / 2; smallCircleY = height / 2; smallCircleR = wIDth / 8; bitmap = BitmapFactory.decodeResource(getResources(),R.mipmap.fangxiang); remoteVIEwBg = new RemoteVIEwBg(bitmap); th = new Thread(this); flag = true; th.start();}/*** * 得到两点之间的弧度 */public float geTrad(float px1,2)); float cosAngle = x / z; float rad = (float) Math.acos(cosAngle); if (py2 < py1) { rad = -rad; } return rad;}@OverrIDepublic boolean ontouchEvent(MotionEvent event) { if (event.getAction() == MotionEvent.ACTION_DOWN || event.getAction() == MotionEvent.ACTION_MOVE) { // 在范围外触摸 if (Math.sqrt(Math.pow((bigCircleX - (int) event.getX()),tempRad); } else {//范围内触摸 smallCircleX = (int) event.getX(); smallCircleY = (int) event.getY(); } } else if (event.getAction() == MotionEvent.ACTION_UP) { smallCircleX = bigCircleX; smallCircleY = bigCircleY; } return true;}public voID getXY(float x,float y,float R,double rad) { //获取圆周运动的X坐标 smallCircleX = (float) (R * Math.cos(rad)) + x; //获取圆周运动的Y坐标 smallCircleY = (float) (R * Math.sin(rad)) + y;}public voID draw() { try { canvas = sfh.lockCanvas(); canvas.drawcolor(getResources().getcolor(R.color.ghostwhite)); // 指定图片绘制区域(左上角的四分之一) Rect src = new Rect(0,paint); } catch (Exception e) { // Todo: handle exception } finally { try { if (canvas != null) sfh.unlockCanvasAndPost(canvas); } catch (Exception e2) { e2.printstacktrace(); } }}public voID run() { while (flag) { draw(); try { Thread.sleep(50); } catch (Exception ex) { ex.printstacktrace(); } }}public voID surfaceChanged(SurfaceHolder holder,int format,int wIDth,int height) {}public voID surfaceDestroyed(SurfaceHolder holder) { flag = false;} }
总结
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