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BidirSlidingLayout_Android双向滑动菜单完全解析，教你如何一分钟实现双向滑动特效package com.example.bidirslidinglayout;import android.content.Context;import android.os.AsyncTask;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.VelocityTracker;import android.view.View;import android.view.ViewConfiguration;import android.view.View.OnTouchListener;import android.view.WindowManager;import android.widget.RelativeLayout;/** * 双向滑动菜单框架 * * @author guolin */public class BidirSlidingLayout extends RelativeLayout implements OnTouchListener { /** * 滚动显示和隐藏左侧布局时，手指滑动需要达到的速度。 */ public static final int SNAP_VELOCITY = 200; /** * 滑动状态的一种，表示未进行任何滑动。 */ public static final int DO_NOTHING = 0; /** * 滑动状态的一种，表示正在滑出左侧菜单。 */ public static final int SHOW_LEFT_MENU = 1; /** * 滑动状态的一种，表示正在滑出右侧菜单。 */ public static final int SHOW_RIGHT_MENU = 2; /** * 滑动状态的一种，表示正在隐藏左侧菜单。 */ public static final int HIDE_LEFT_MENU = 3; /** * 滑动状态的一种，表示正在隐藏右侧菜单。 */ public static final int HIDE_RIGHT_MENU = 4; /** * 记录当前的滑动状态 */ private int slideState; /** * 屏幕宽度值。 */ private int screenWidth; /** * 在被判定为滚动之前用户手指可以移动的最大值。 */ private int touchSlop; /** * 记录手指按下时的横坐标。 */ private float xDown; /** * 记录手指按下时的纵坐标。 */ private float yDown; /** * 记录手指移动时的横坐标。 */ private float xMove; /** * 记录手指移动时的纵坐标。 */ private float yMove; /** * 记录手机抬起时的横坐标。 */ private float xUp; /** * 左侧菜单当前是显示还是隐藏。只有完全显示或隐藏时才会更改此值，滑动过程中此值无效。 */ private boolean isLeftMenuVisible; /** * 右侧菜单当前是显示还是隐藏。只有完全显示或隐藏时才会更改此值，滑动过程中此值无效。 */ private boolean isRightMenuVisible; /** * 是否正在滑动。 */ private boolean isSliding; /** * 左侧菜单布局对象。 */ private View leftMenuLayout; /** * 右侧菜单布局对象。 */ private View rightMenuLayout; /** * 内容布局对象。 */ private View contentLayout; /** * 用于监听滑动事件的View。 */ private View mBindView; /** * 左侧菜单布局的参数。 */ private MarginLayoutParams leftMenuLayoutParams; /** * 右侧菜单布局的参数。 */ private MarginLayoutParams rightMenuLayoutParams; /** * 内容布局的参数。 */ private RelativeLayout.LayoutParams contentLayoutParams; /** * 用于计算手指滑动的速度。 */ private VelocityTracker mVelocityTracker; /** * 重写BidirSlidingLayout的构造函数，其中获取了屏幕的宽度和touchSlop的值。 * * @param context * @param attrs */ public BidirSlidingLayout(Context context, AttributeSet attrs) { super(context, attrs); WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE); screenWidth = wm.getDefaultDisplay().getWidth(); touchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); } /** * 绑定监听滑动事件的View。 * * @param bindView * 需要绑定的View对象。 */ public void setScrollEvent(View bindView) { mBindView = bindView; mBindView.setOnTouchListener(this); } /** * 将界面滚动到左侧菜单界面，滚动速度设定为-30. */ public void scrollToLeftMenu() { new LeftMenuScrollTask().execute(-30); } /** * 将界面滚动到右侧菜单界面，滚动速度设定为-30. */ public void scrollToRightMenu() { new RightMenuScrollTask().execute(-30); } /** * 将界面从左侧菜单滚动到内容界面，滚动速度设定为30. */ public void scrollToContentFromLeftMenu() { new LeftMenuScrollTask().execute(30); } /** * 将界面从右侧菜单滚动到内容界面，滚动速度设定为30. */ public void scrollToContentFromRightMenu() { new RightMenuScrollTask().execute(30); } /** * 左侧菜单是否完全显示出来，滑动过程中此值无效。 * * @return 左侧菜单完全显示返回true，否则返回false。 */ public boolean isLeftLayoutVisible() { return isLeftMenuVisible; } /** * 右侧菜单是否完全显示出来，滑动过程中此值无效。 * * @return 右侧菜单完全显示返回true，否则返回false。 */ public boolean isRightLayoutVisible() { return isRightMenuVisible; } /** * 在onLayout中重新设定左侧菜单、右侧菜单、以及内容布局的参数。 */ @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { super.onLayout(changed, l, t, r, b); if (changed) { // 获取左侧菜单布局对象 leftMenuLayout = getChildAt(0); leftMenuLayoutParams = (MarginLayoutParams) leftMenuLayout.getLayoutParams(); // 获取右侧菜单布局对象 rightMenuLayout = getChildAt(1); rightMenuLayoutParams = (MarginLayoutParams) rightMenuLayout.getLayoutParams(); // 获取内容布局对象 contentLayout = getChildAt(2); contentLayoutParams = (RelativeLayout.LayoutParams) contentLayout.getLayoutParams(); contentLayoutParams.width = screenWidth; contentLayout.setLayoutParams(contentLayoutParams); } } @Override public boolean onTouch(View v, MotionEvent event) { createVelocityTracker(event); switch (event.getAction()) { case MotionEvent.ACTION_DOWN: // 手指按下时，记录按下时的坐标 xDown = event.getRawX(); yDown = event.getRawY(); // 将滑动状态初始化为DO_NOTHING slideState = DO_NOTHING; break; case MotionEvent.ACTION_MOVE: xMove = event.getRawX(); yMove = event.getRawY(); // 手指移动时，对比按下时的坐标，计算出移动的距离。 int moveDistanceX = (int) (xMove - xDown); int moveDistanceY = (int) (yMove - yDown); // 检查当前的滑动状态 checkSlideState(moveDistanceX, moveDistanceY); // 根据当前滑动状态决定如何偏移内容布局 switch (slideState) { case SHOW_LEFT_MENU: contentLayoutParams.rightMargin = -moveDistanceX; checkLeftMenuBorder(); contentLayout.setLayoutParams(contentLayoutParams); break; case HIDE_LEFT_MENU: contentLayoutParams.rightMargin = -leftMenuLayoutParams.width - moveDistanceX; checkLeftMenuBorder(); contentLayout.setLayoutParams(contentLayoutParams); case SHOW_RIGHT_MENU: contentLayoutParams.leftMargin = moveDistanceX; checkRightMenuBorder(); contentLayout.setLayoutParams(contentLayoutParams); break; case HIDE_RIGHT_MENU: contentLayoutParams.leftMargin = -rightMenuLayoutParams.width moveDistanceX; checkRightMenuBorder(); contentLayout.setLayoutParams(contentLayoutParams); default: break; } break; case MotionEvent.ACTION_UP: xUp = event.getRawX(); int upDistanceX = (int) (xUp - xDown); if (isSliding) { // 手指抬起时，进行判断当前手势的意图 switch (slideState) { case SHOW_LEFT_MENU: if (shouldScrollToLeftMenu()) { scrollToLeftMenu(); } else { scrollToContentFromLeftMenu(); } break; case HIDE_LEFT_MENU: if (shouldScrollToContentFromLeftMenu()) { scrollToContentFromLeftMenu(); } else { scrollToLeftMenu(); } break; case SHOW_RIGHT_MENU: if (shouldScrollToRightMenu()) { scrollToRightMenu(); } else { scrollToContentFromRightMenu(); } break; case HIDE_RIGHT_MENU: if (shouldScrollToContentFromRightMenu()) { scrollToContentFromRightMenu(); } else { scrollToRightMenu(); } break; default: break; } } else if (upDistanceX < touchSlop && isLeftMenuVisible) { // 当左侧菜单显示时，如果用户点击一下内容部分，则直接滚动到内容界面 scrollToContentFromLeftMenu(); } else if (upDistanceX < touchSlop && isRightMenuVisible) { // 当右侧菜单显示时，如果用户点击一下内容部分，则直接滚动到内容界面 scrollToContentFromRightMenu(); } recycleVelocityTracker(); break; } if (v.isEnabled()) { if (isSliding) { // 正在滑动时让控件得不到焦点 unFocusBindView(); return true; } if (isLeftMenuVisible || isRightMenuVisible) { // 当左侧或右侧布局显示时，将绑定控件的事件屏蔽掉 return true; } return false; } return true; } /** * 根据手指移动的距离，判断当前用户的滑动意图，然后给slideState赋值成相应的滑动状态值。 * * @param moveDistanceX * 横向移动的距离 * @param moveDistanceY * 纵向移动的距离 */ private void checkSlideState(int moveDistanceX, int moveDistanceY) { if (isLeftMenuVisible) { if (!isSliding && Math.abs(moveDistanceX) >= touchSlop && moveDistanceX < 0) { isSliding = true; slideState = HIDE_LEFT_MENU; } } else if (isRightMenuVisible) { if (!isSliding && Math.abs(moveDistanceX) >= touchSlop && moveDistanceX > 0) { isSliding = true; slideState = HIDE_RIGHT_MENU; } } else { if (!isSliding && Math.abs(moveDistanceX) >= touchSlop && moveDistanceX > 0 && Math.abs(moveDistanceY) < touchSlop) { isSliding = true; slideState = SHOW_LEFT_MENU; contentLayoutParams.addRule(RelativeLayout.ALIGN_PARENT_LEFT, 0); contentLayoutParams.addRule(RelativeLayout.ALIGN_PARENT_RIGHT); contentLayout.setLayoutParams(contentLayoutParams); // 如果用户想要滑动左侧菜单，将左侧菜单显示，右侧菜单隐藏 leftMenuLayout.setVisibility(View.VISIBLE); rightMenuLayout.setVisibility(View.GONE); } else if (!isSliding && Math.abs(moveDistanceX) >= touchSlop && moveDistanceX < 0 && Math.abs(moveDistanceY) < touchSlop) { isSliding = true; slideState = SHOW_RIGHT_MENU; contentLayoutParams.addRule(RelativeLayout.ALIGN_PARENT_RIGHT, 0); contentLayoutParams.addRule(RelativeLayout.ALIGN_PARENT_LEFT); contentLayout.setLayoutParams(contentLayoutParams); // 如果用户想要滑动右侧菜单，将右侧菜单显示，左侧菜单隐藏 rightMenuLayout.setVisibility(View.VISIBLE); leftMenuLayout.setVisibility(View.GONE); } } } /** * 在滑动过程中检查左侧菜单的边界值，防止绑定布局滑出屏幕。 */ private void checkLeftMenuBorder() { if (contentLayoutParams.rightMargin > 0) { contentLayoutParams.rightMargin = 0; } else if (contentLayoutParams.rightMargin < -leftMenuLayoutParams.width) { contentLayoutParams.rightMargin = -leftMenuLayoutParams.width; } } /** * 在滑动过程中检查右侧菜单的边界值，防止绑定布局滑出屏幕。 */ private void checkRightMenuBorder() { if (contentLayoutParams.leftMargin > 0) { contentLayoutParams.leftMargin = 0; } else if (contentLayoutParams.leftMargin < -rightMenuLayoutParams.width) { contentLayoutParams.leftMargin = -rightMenuLayoutParams.width; } } /** * 判断是否应该滚动将左侧菜单展示出来。如果手指移动距离大于左侧菜单宽度的1/2，或者手指移动速度大于SNAP_VELOCITY， * 就认为应该滚动将左侧菜单展示出来。 * * @return 如果应该将左侧菜单展示出来返回true，否则返回false。 */ private boolean shouldScrollToLeftMenu() { return xUp - xDown > leftMenuLayoutParams.width / 2 || getScrollVelocity() > SNAP_VELOCITY; } /** * 判断是否应该滚动将右侧菜单展示出来。如果手指移动距离大于右侧菜单宽度的1/2，或者手指移动速度大于SNAP_VELOCITY， * 就认为应该滚动将右侧菜单展示出来。 * * @return 如果应该将右侧菜单展示出来返回true，否则返回false。 */ private boolean shouldScrollToRightMenu() { return xDown - xUp > rightMenuLayoutParams.width / 2 || getScrollVelocity() > SNAP_VELOCITY; } /** * 判断是否应该从左侧菜单滚动到内容布局，如果手指移动距离大于左侧菜单宽度的1/2，或者手指移动速度大于SNAP_VELOCITY， * 就认为应该从左侧菜单滚动到内容布局。 * * @return 如果应该从左侧菜单滚动到内容布局返回true，否则返回false。 */ private boolean shouldScrollToContentFromLeftMenu() { return xDown - xUp > leftMenuLayoutParams.width / 2 || getScrollVelocity() > SNAP_VELOCITY; } /** * 判断是否应该从右侧菜单滚动到内容布局，如果手指移动距离大于右侧菜单宽度的1/2，或者手指移动速度大于SNAP_VELOCITY， * 就认为应该从右侧菜单滚动到内容布局。 * * @return 如果应该从右侧菜单滚动到内容布局返回true，否则返回false。 */ private boolean shouldScrollToContentFromRightMenu() { return xUp - xDown > rightMenuLayoutParams.width / 2 || getScrollVelocity() > SNAP_VELOCITY; } /** * 创建VelocityTracker对象，并将触摸事件加入到VelocityTracker当中。 * * @param event * 右侧布局监听控件的滑动事件 */ private void createVelocityTracker(MotionEvent event) { if (mVelocityTracker == null) { mVelocityTracker = VelocityTracker.obtain(); } mVelocityTracker.addMovement(event); } /** * 获取手指在绑定布局上的滑动速度。 * * @return 滑动速度，以每秒钟移动了多少像素值为单位。 */ private int getScrollVelocity() { mVelocityTracker.computeCurrentVelocity(1000); int velocity = (int) mVelocityTracker.getXVelocity(); return Math.abs(velocity); } /** * 回收VelocityTracker对象。 */ private void recycleVelocityTracker() { mVelocityTracker.recycle(); mVelocityTracker = null; } /** * 使用可以获得焦点的控件在滑动的时候失去焦点。 */ private void unFocusBindView() { if (mBindView != null) { mBindView.setPressed(false); mBindView.setFocusable(false); mBindView.setFocusableInTouchMode(false); } } class LeftMenuScrollTask extends AsyncTask { @Override protected Integer doInBackground(Integer... speed) { int rightMargin = contentLayoutParams.rightMargin; // 根据传入的速度来滚动界面，当滚动到达边界值时，跳出循环。 while (true) { rightMargin = rightMargin speed[0]; if (rightMargin < -leftMenuLayoutParams.width) { rightMargin = -leftMenuLayoutParams.width; break; } if (rightMargin > 0) { rightMargin = 0; break; } publishProgress(rightMargin); // 为了要有滚动效果产生，每次循环使线程睡眠一段时间，这样肉眼才能够看到滚动动画。 sleep(15); } if (speed[0] > 0) { isLeftMenuVisible = false; } else { isLeftMenuVisible = true; } isSliding = false; return rightMargin; } @Override protected void onProgressUpdate(Integer... rightMargin) { contentLayoutParams.rightMargin = rightMargin[0]; contentLayout.setLayoutParams(contentLayoutParams); unFocusBindView(); } @Override protected void onPostExecute(Integer rightMargin) { contentLayoutParams.rightMargin = rightMargin; contentLayout.setLayoutParams(contentLayoutParams); } } class RightMenuScrollTask extends AsyncTask { @Override protected Integer doInBackground(Integer... speed) { int leftMargin = contentLayoutParams.leftMargin; // 根据传入的速度来滚动界面，当滚动到达边界值时，跳出循环。 while (true) { leftMargin = leftMargin speed[0]; if (leftMargin < -rightMenuLayoutParams.width) { leftMargin = -rightMenuLayoutParams.width; break; } if (leftMargin > 0) { leftMargin = 0; break; } publishProgress(leftMargin); // 为了要有滚动效果产生，每次循环使线程睡眠一段时间，这样肉眼才能够看到滚动动画。 sleep(15); } if (speed[0] > 0) { isRightMenuVisible = false; } else { isRightMenuVisible = true; } isSliding = false; return leftMargin; } @Override protected void onProgressUpdate(Integer... leftMargin) { contentLayoutParams.leftMargin = leftMargin[0]; contentLayout.setLayoutParams(contentLayoutParams); unFocusBindView(); } @Override protected void onPostExecute(Integer leftMargin) { contentLayoutParams.leftMargin = leftMargin; contentLayout.setLayoutParams(contentLayoutParams); } } /** * 使当前线程睡眠指定的毫秒数。 * * @param millis * 指定当前线程睡眠多久，以毫秒为单位 */ private void sleep(long millis) { try { Thread.sleep(millis); } catch (InterruptedException e) { e.printStackTrace(); } }}  

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Android中使用图形处理引擎，2D部分是android SDK内部自己提供，3D部分是用Open GL ES 1.0。今天我们主要要了解的是2D相关的，如果你想看3D的话那么可以跳过这篇文章。 大部分2D使用的api都在android.graphics和android.graphics.drawable包中。他们提供了图形处理相关的： Canvas、ColorFilter、Point(点)和RetcF(矩形)等，还有一些动画相关的：AnimationDrawable、 BitmapDrawable和TransitionDrawable等。以图形处理来说，我们最常用到的就是在一个View上画一些图片、形状或者自定义的文本内容，这里我们都是使用Canvas来实现的。你可以获取View中的Canvas对象，绘制一些自定义形状，然后调用View. invalidate方法让View重新刷新，然后绘制一个新的形状，这样达到2D动画效果。下面我们就主要来了解下Canvas的使用方法。 Canvas对象的获取方式有两种：一种我们通过重写View.onDraw方法，View中的Canvas对象会被当做参数传递过来，我们操作这个Canvas，效果会直接反应在View中。另一种就是当你想创建一个Canvas对象时使用的方法： 1 2 Bitmap b = Bitmap.createBitmap(100, 100, Bitmap.Config.ARGB_8888);   Canvas c =newCanvas(b); 上面代码创建了一个尺寸是100*100的Bitmap，使用它作为Canvas操作的对象，这时候的Canvas就是使用创建的方式。当你使用创建的Canvas在bitmap上执行绘制方法后，你还可以将绘制的结果提交给另外一个Canvas，这样就可以达到两个Canvas协作完成的效果，简化逻辑。但是android SDK建议使用View.onDraw参数里提供的Canvas就好，没必要自己创建一个新的Canvas对象。接下来我们看看Canvas提供我们哪些绘制图形的方法。我们创建一个自定义View对象，使用onDraw方法提供的Canvas进行绘制图形。 CanvasDemoActivity.java： 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 package com.android777.demo.uicontroller.graphics;                                                                                                                                      import android.app.Activity;   import android.content.Context;   import android.graphics.Canvas;   import android.graphics.Color;   import android.graphics.Paint;   import android.os.Bundle;   import android.view.View;                                                                                                                                      public class CanvasDemoActivity extends Activity {                                                                                                                                          @Override       protected void onCreate(Bundle savedInstanceState) {           super.onCreate(savedInstanceState);                                                                                                                                              setContentView(newCustomView1(this));                                                                                                                                          }                                                                                                                                          /**        * 使用内部类 自定义一个简单的View        * @author Administrator        *        */     class CustomView1 extends View{                                                                                                                                              Paint paint;                                                                                                                                              public CustomView1(Context context) {               super(context);               paint =newPaint();//设置一个笔刷大小是3的黄色的画笔               paint.setColor(Color.YELLOW);               paint.setStrokeJoin(Paint.Join.ROUND);               paint.setStrokeCap(Paint.Cap.ROUND);               paint.setStrokeWidth(3);           }                                                                                                                                              //在这里我们将测试canvas提供的绘制图形方法           @Override           protected void onDraw(Canvas canvas) {                                                                                                                                              }                                                                                                                                          }                                                                                                                                      } 执行结果是一片黑色的区域，因为在自定义的CustomView1中，我们没有做任何的绘制操作。canvas提供的绘制图形的方法都是以draw开头的，我们可以查看api： 从上面方法的名字看来我们可以知道Canvas可以绘制的对象有：弧线(arcs)、填充颜色(argb和color)、 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                                                                                                                                       RectF rect =newRectF(0, 0, 100, 100);                                                                                                                                          canvas.drawArc(rect,//弧线所使用的矩形区域大小               0, //开始角度               90,//扫过的角度               false,//是否使用中心               paint);                                                                                                                                      } 使用下面的代码： 1 2 3 4 5 6 7 8 9 10 11 12 13 protected void onDraw(Canvas canvas) {                                                                                                                                          //绘制弧线区域                                                                                                                                          RectF rect =newRectF(0, 0, 100, 100);                                                                                                                                          canvas.drawArc(rect,//弧线所使用的矩形区域大小               0, //开始角度               90,//扫过的角度               true,//是否使用中心               paint);                                                                                                                                      } 两图对比我们可以发现，当 drawArcs(rect,startAngel,sweepAngel,useCenter,paint)中的useCenter为false时，弧线区域是用弧线开始角度和结束角度直接连接起来的，当useCenter为true时，是弧线开始角度和结束角度都与中心点连接，形成一个扇形。 1 2 3 4 5 protected void onDraw(Canvas canvas) {                                                                                                                                          canvas.drawColor(Color.BLUE);                                                                                                                                      } canvas.drawColor是直接将View显示区域用某个颜色填充满。 1 2 3 4 5 6 7 @Override   protected void onDraw(Canvas canvas) {                                                                                                                                          //画一条线       canvas.drawLine(10, 10, 100, 100, paint);                                                                                                                                      } Canvas.drawOval： 1 2 3 4 5 6 7 8 9 @Override   protected void onDraw(Canvas canvas) {                                                                                                                                          //定义一个矩形区域       RectF oval =newRectF(0,0,200,300);       //矩形区域内切椭圆       canvas.drawOval(oval, paint);                                                                                                                                      } canvas.drawPosText： 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 @Override   protected void onDraw(Canvas canvas) {                                                                                                                                          //按照既定点 绘制文本内容       canvas.drawPosText("Android777",newfloat[]{               10,10,//第一个字母在坐标10,10               20,20,//第二个字母在坐标20,20               30,30,//....               40,40,               50,50,               60,60,               70,70,               80,80,               90,90,               100,100       }, paint);                                                                                                                                      } canvas.drawRect： 1 2 3 4 5 6 7 8 9 10 @Override       protected void onDraw(Canvas canvas) {                                                                                                                                              RectF rect =newRectF(50, 50, 200, 200);                                                                                                                                              canvas.drawRect(rect, paint);                                                                                                                                          }                                                                                                                                      } canvas.drawRoundRect： 1 2 3 4 5 6 7 8 9 10 11 @Override   protected void onDraw(Canvas canvas) {                                                                                                                                          RectF rect =newRectF(50, 50, 200, 200);                                                                                                                                          canvas.drawRoundRect(rect,                           30,//x轴的半径                           30,//y轴的半径                           paint);                                                                                                                                      } canvas.drawPath： 1 2 3 4 5 6 7 8 9 10 11 12 @Override   protected void onDraw(Canvas canvas) {                                                                                                                                          Path path =newPath();//定义一条路径       path.moveTo(10, 10);//移动到 坐标10,10       path.lineTo(50, 60);       path.lineTo(200,80);       path.lineTo(10, 10);                                                                                                                                          canvas.drawPath(path, paint);                                                                                                                                      } canvas.drawTextOnPath： 1 2 3 4 5 6 7 8 9 10 11 12 13 @Override           protected void onDraw(Canvas canvas) {                                                                                                                                                  Path path =newPath();//定义一条路径               path.moveTo(10, 10);//移动到 坐标10,10               path.lineTo(50, 60);               path.lineTo(200,80);               path.lineTo(10, 10);                                                                                                                                      //          canvas.drawPath(path, paint);               canvas.drawTextOnPath("Android777开发者博客", path, 10, 10, paint);                                                                                                                                              } 位置转换方法，canvas.rorate和canvas.translate： 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 @Override   protected void onDraw(Canvas canvas) {                                                                                                                                          paint.setAntiAlias(true);       paint.setStyle(Style.STROKE);       canvas.translate(canvas.getWidth()/2, 200);//将位置移动画纸的坐标点:150,150       canvas.drawCircle(0, 0, 100, paint);//画圆圈                                                                                                                                          //使用path绘制路径文字       canvas.save();       canvas.translate(-75, -75);       Path path =newPath();       path.addArc(newRectF(0,0,150,150), -180, 180);       Paint citePaint =newPaint(paint);       citePaint.setTextSize(14);       citePaint.setStrokeWidth(1);       canvas.drawTextOnPath("http://www.android777.com", path, 28, 0, citePaint);       canvas.restore();                                                                                                                                          Paint tmpPaint =newPaint(paint);//小刻度画笔对象       tmpPaint.setStrokeWidth(1);                                                                                                                                          float  y=100;       int count = 60;//总刻度数                                                                                                                                          for(int i=0 ; i

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