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Android自定義View實(shí)現(xiàn)游戲搖桿鍵盤(pán)的方法示例

 更新時(shí)間：2017年07月17日 09:36:01   作者：木子餅干  
Android進(jìn)階過(guò)程中有一個(gè)繞不開(kāi)的話(huà)題——自定義View。最近在做項(xiàng)目中又遇到了，所以下面這篇文章主要給大家介紹了利用Android自定義View實(shí)現(xiàn)游戲搖桿鍵盤(pán)的相關(guān)資料，操作方式類(lèi)似王者榮耀的搖桿操作，文中通過(guò)示例代碼介紹的非常詳細(xì)，需要的朋友們下面來(lái)一起看看吧。

前言

本文主要給大家介紹的是關(guān)于Android自定義View實(shí)現(xiàn)游戲搖桿鍵盤(pán)的相關(guān)內(nèi)容，為什么會(huì)有這篇文章呢？因?yàn)樵谥暗囊粋€(gè)項(xiàng)目，操作方向的方式為上下左右，左上需要同時(shí)按住左鍵和右鍵的方式進(jìn)行操作。

如下圖：

近來(lái)需要升級(jí)項(xiàng)目，操作方式改為類(lèi)似王者榮耀的搖桿操作。

如下圖：


好了，下面話(huà)不多說(shuō)了，跟著小編來(lái)一起看看是如何實(shí)現(xiàn)的吧。

繪制背景

實(shí)現(xiàn)遙感按鈕，需要繪制背景，繪制中心的遙感按鈕。繪制遙感背景，需要?jiǎng)?chuàng)建一個(gè)RemoteViewBg類(lèi)，存儲(chǔ)背景圖，減少重復(fù)創(chuàng)建bitmap。

RemoteViewBg類(lèi)代碼如下：

public class RemoteViewBg {
private Bitmap bitmapBg;
public RemoteViewBg(Bitmap bitmap) {
 bitmapBg = bitmap;
}

//背景的繪圖函數(shù)
public void draw(Canvas canvas, Paint paint, Rect src0 ,Rect dst0 ) {
 canvas.drawBitmap(bitmapBg, src0, dst0, paint);
}
}

點(diǎn)擊觸摸事件

重寫(xiě)系統(tǒng)的觸摸時(shí)間，判斷觸摸點(diǎn)在背景范圍內(nèi)還是背景范圍外

 @Override
public boolean onTouchEvent(MotionEvent event) {
 if (event.getAction() == MotionEvent.ACTION_DOWN || event.getAction() ==  MotionEvent.ACTION_MOVE) {
 //   // 在范圍外觸摸
  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, bigCircleY, bigCircleR, tempRad);
  } else {//范圍內(nèi)觸摸
   smallCircleX = (int) event.getX();
   smallCircleY = (int) event.getY();
  }
 } else if (event.getAction() == MotionEvent.ACTION_UP) {
  smallCircleX = bigCircleX;
  smallCircleY = bigCircleY;

 }
 return true;
}

弧度計(jì)算

通過(guò) event.getX() , event.getY()獲得當(dāng)前的觸摸點(diǎn)，與圓點(diǎn)進(jìn)行計(jì)算，獲取弧度

/***
 * 得到兩點(diǎn)之間的弧度
 */
public float getRad(float px1, float py1, float px2, float py2) {
 float x = px2 - px1;

 float y = py1 - py2;
 //斜邊的長(zhǎng)
 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;
}

圖形繪制

通過(guò) canvas.drawCircle()和 canvas.drawBitmap()分別進(jìn)行遙感按鈕和遙感背景的繪制，注意對(duì)遙感背景的保存，如果在繪制的時(shí)候每次BitmapFactory.decodeResource()會(huì)增加耗時(shí)，因此只需在surfaceCreated（）中進(jìn)行bitmap的生成即可。

public void draw() {
 try {
  canvas = sfh.lockCanvas();
  canvas.drawColor(getResources().getColor(R.color.ghostwhite));


 // 指定圖片繪制區(qū)域(左上角的四分之一)
  Rect src = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());

  // 指定圖片在屏幕上顯示的區(qū)域
  Rect dst = new Rect(bigCircleX - bigCircleR, bigCircleY - bigCircleR, bigCircleX + bigCircleR, bigCircleY + bigCircleR);
  // 繪制圖片
  remoteViewBg.draw(canvas, paint, src, dst);
  paint.setColor(0x70ff0000);
  //繪制搖桿
  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中動(dòng)態(tài)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);

全部代碼

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;
//搖桿的X,Y坐標(biāo)以及搖桿的半徑
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();


}

/***
 * 得到兩點(diǎn)之間的弧度
 */
public float getRad(float px1, float py1, float px2, float py2) {
 float x = px2 - px1;

 float y = py1 - py2;
 //斜邊的長(zhǎng)
 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;
}

@Override
public boolean onTouchEvent(MotionEvent event) {
 if (event.getAction() == MotionEvent.ACTION_DOWN || event.getAction() == MotionEvent.ACTION_MOVE) {
  // 在范圍外觸摸
  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, bigCircleY, bigCircleR, tempRad);
  } else {//范圍內(nèi)觸摸
   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) {
 //獲取圓周運(yùn)動(dòng)的X坐標(biāo)
 smallCircleX = (float) (R * Math.cos(rad)) + x;
 //獲取圓周運(yùn)動(dòng)的Y坐標(biāo)
 smallCircleY = (float) (R * Math.sin(rad)) + y;
}

public void draw() {
 try {
  canvas = sfh.lockCanvas();
  canvas.drawColor(getResources().getColor(R.color.ghostwhite));


  // 指定圖片繪制區(qū)域(左上角的四分之一)
  Rect src = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());

  // 指定圖片在屏幕上顯示的區(qū)域
  Rect dst = new Rect(bigCircleX - bigCircleR, bigCircleY - bigCircleR, bigCircleX + bigCircleR, bigCircleY + bigCircleR);
  // 繪制圖片
  remoteViewBg.draw(canvas, paint, src, dst);
  paint.setColor(0x70ff0000);
  //繪制搖桿
  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();
  }
 }
}

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;

}
 }

總結(jié)

以上就是這篇文章的全部?jī)?nèi)容，希望本文的內(nèi)容對(duì)大家的學(xué)習(xí)或者工作能帶來(lái)一定的幫助，如果有疑問(wèn)大家可以留言交流，謝謝大家對(duì)腳本之家的支持。

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