Android雷达扫描动态界面制作

package com.zihao.radar;  import android.app.Activity; import android.os.Bundle; import android.view.Window; import android.view.WindowManager;  import com.zihao.radar.view.RadarView;  public class MainActivity extends Activity {    private RadarView mRadarView;    @Override   protected void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     requestWindowFeature(Window.FEATURE_NO_TITLE);     // 取消状态栏     getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,         WindowManager.LayoutParams.FLAG_FULLSCREEN);     setContentView(R.layout.activity_main);     mRadarView = (RadarView) findViewById(R.id.radar_view);     mRadarView.setSearching(true);     mRadarView.addPoint();     mRadarView.addPoint();   }  } 

package com.zihao.radar.view;  import java.util.ArrayList; import java.util.List; import java.util.Random;  import android.annotation.SuppressLint; import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Paint; import android.graphics.Paint.Style; import android.util.AttributeSet; import android.view.View;  import com.zihao.radar.R;  /**  * @ClassName：RadarView  * @Description：TODO<雷达扫描视图>  * @author：zihao  * @date：2015年11月11日 上午12:26:11  * @version：v1.1  */ @SuppressLint("DrawAllocation") public class RadarView extends View {    private Context mContext;   private boolean isSearching = false;// 标识是否处于扫描状态,默认为不在扫描状态   private Paint mPaint;// 画笔   private Bitmap mScanBmp;// 执行扫描运动的图片   private int mOffsetArgs = 0;// 扫描运动偏移量参数   private Bitmap mDefaultPointBmp;// 标识设备的圆点-默认   private Bitmap mLightPointBmp;// 标识设备的圆点-高亮   private int mPointCount = 0;// 圆点总数   private List<String> mPointArray = new ArrayList<String>();// 存放偏移量的map   private Random mRandom = new Random();   private int mWidth, mHeight;// 宽高   int mOutWidth;// 外圆宽度(w/4/5*2=w/10)   int mCx, mCy;// x、y轴中心点   int mOutsideRadius, mInsideRadius;// 外、内圆半径    public RadarView(Context context, AttributeSet attrs, int defStyleAttr) {     super(context, attrs, defStyleAttr);     // TODO Auto-generated constructor stub     init(context);   }    public RadarView(Context context, AttributeSet attrs) {     super(context, attrs);     // TODO Auto-generated constructor stub     init(context);   }    public RadarView(Context context) {     super(context);     // TODO Auto-generated constructor stub     init(context);   }    /**    * TODO<提前初始化好需要使用的对象,避免在绘制过程中多次初始化>    *    * @return void    */   private void init(Context context) {     mPaint = new Paint();     this.mContext = context;     this.mDefaultPointBmp = Bitmap.createBitmap(BitmapFactory         .decodeResource(mContext.getResources(),             R.drawable.radar_default_point_ico));     this.mLightPointBmp = Bitmap.createBitmap(BitmapFactory.decodeResource(         mContext.getResources(), R.drawable.radar_light_point_ico));   }    /**    * 测量视图及其内容,以确定所测量的宽度和高度(测量获取控件尺寸).    */   @Override   protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {     // TODO Auto-generated method stub     super.onMeasure(widthMeasureSpec, heightMeasureSpec);      // 获取控件区域宽高     if (mWidth == 0 || mHeight == 0) {       final int minimumWidth = getSuggestedMinimumWidth();       final int minimumHeight = getSuggestedMinimumHeight();       mWidth = resolveMeasured(widthMeasureSpec, minimumWidth);       mHeight = resolveMeasured(heightMeasureSpec, minimumHeight);       mScanBmp = Bitmap.createScaledBitmap(BitmapFactory.decodeResource(           mContext.getResources(), R.drawable.radar_scan_img), mWidth           - mOutWidth, mWidth - mOutWidth, false);        // 获取x/y轴中心点       mCx = mWidth / 2;       mCy = mHeight / 2;        // 获取外圆宽度       mOutWidth = mWidth / 10;        // 计算内、外半径       mOutsideRadius = mWidth / 2;// 外圆的半径       mInsideRadius = (mWidth - mOutWidth) / 4 / 2;// 内圆的半径,除最外层,其它圆的半径=层数*insideRadius     }   }    /**    * 绘制视图--从外部向内部绘制    */   @Override   protected void onDraw(Canvas canvas) {     // TODO Auto-generated method stub     super.onDraw(canvas);     // 开始绘制最外层的圆     mPaint.setAntiAlias(true);// 设置抗锯齿     mPaint.setStyle(Style.FILL);// 设置填充样式     mPaint.setColor(0xffB8DCFC);// 设置画笔颜色     // 1.开始绘制圆形     canvas.drawCircle(mCx, mCy, mOutsideRadius, mPaint);      // 开始绘制内4圆     mPaint.setColor(0xff3278B4);     canvas.drawCircle(mCx, mCy, mInsideRadius * 4, mPaint);      // 开始绘制内3圆     mPaint.setStyle(Style.STROKE);     mPaint.setColor(0xff31C9F2);     canvas.drawCircle(mCx, mCy, mInsideRadius * 3, mPaint);      // 开始绘制内2圆     canvas.drawCircle(mCx, mCy, mInsideRadius * 2, mPaint);      // 开始绘制内1圆     canvas.drawCircle(mCx, mCy, mInsideRadius * 1, mPaint);      // 2.开始绘制对角线     canvas.drawLine(mOutWidth / 2, mCy, mWidth - mOutWidth / 2, mCy, mPaint);// 绘制0°~180°对角线     canvas.drawLine(mCx, mHeight - mOutWidth / 2, mCx, mOutWidth / 2,         mPaint);// 绘制90°~270°对角线      // 根据角度绘制对角线     int startX, startY, endX, endY;     double radian;      // 绘制45°~225°对角线     // 计算开始位置x/y坐标点     radian = Math.toRadians((double) 45);// 将角度转换为弧度     startX = (int) (mCx + mInsideRadius * 4 * Math.cos(radian));// 通过圆心坐标、半径和当前角度计算当前圆周的某点横坐标     startY = (int) (mCy + mInsideRadius * 4 * Math.sin(radian));// 通过圆心坐标、半径和当前角度计算当前圆周的某点纵坐标     // 计算结束位置x/y坐标点     radian = Math.toRadians((double) 45 + 180);     endX = (int) (mCx + mInsideRadius * 4 * Math.cos(radian));     endY = (int) (mCy + mInsideRadius * 4 * Math.sin(radian));     canvas.drawLine(startX, startY, endX, endY, mPaint);      // 绘制135°~315°对角线     // 计算开始位置x/y坐标点     radian = Math.toRadians((double) 135);     startX = (int) (mCx + mInsideRadius * 4 * Math.cos(radian));     startY = (int) (mCy + mInsideRadius * 4 * Math.sin(radian));     // 计算结束位置x/y坐标点     radian = Math.toRadians((double) 135 + 180);     endX = (int) (mCx + mInsideRadius * 4 * Math.cos(radian));     endY = (int) (mCy + mInsideRadius * 4 * Math.sin(radian));     canvas.drawLine(startX, startY, endX, endY, mPaint);      // 3.绘制扫描扇形图     canvas.save();// 用来保存Canvas的状态.save之后，可以调用Canvas的平移、放缩、旋转、错切、裁剪等操作.      if (isSearching) {// 判断是否处于扫描       canvas.rotate(mOffsetArgs, mCx, mCy);// 绘制旋转角度,参数一：角度;参数二：x中心;参数三：y中心.       canvas.drawBitmap(mScanBmp, mCx - mScanBmp.getWidth() / 2, mCy           - mScanBmp.getHeight() / 2, null);// 绘制Bitmap扫描图片效果       mOffsetArgs += 3;     } else {       canvas.drawBitmap(mScanBmp, mCx - mScanBmp.getWidth() / 2, mCy           - mScanBmp.getHeight() / 2, null);     }      // 4.开始绘制动态点     canvas.restore();// 用来恢复Canvas之前保存的状态.防止save后对Canvas执行的操作对后续的绘制有影响.      if (mPointCount > 0) {// 当圆点总数>0时,进入下一层判断        if (mPointCount > mPointArray.size()) {// 当圆点总数大于存储坐标点数目时,说明有增加,需要重新生成随机坐标点         int mx = mInsideRadius + mRandom.nextInt(mInsideRadius * 6);         int my = mInsideRadius + mRandom.nextInt(mInsideRadius * 6);         mPointArray.add(mx + "/" + my);       }        // 开始绘制坐标点       for (int i = 0; i < mPointArray.size(); i++) {         String[] result = mPointArray.get(i).split("/");          // 开始绘制动态点         if (i < mPointArray.size() - 1)           canvas.drawBitmap(mDefaultPointBmp,               Integer.parseInt(result[0]),               Integer.parseInt(result[1]), null);         else           canvas.drawBitmap(mLightPointBmp,               Integer.parseInt(result[0]),               Integer.parseInt(result[1]), null);       }     }      if (isSearching)       this.invalidate();   }    /**    * TODO<设置扫描状态>    *    * @return void    */   public void setSearching(boolean status) {     this.isSearching = status;     this.invalidate();   }    /**    * TODO<新增动态点>    *    * @return void    */   public void addPoint() {     mPointCount++;     this.invalidate();   }    /**    * TODO<解析获取控件宽高>    *    * @return int    */   private int resolveMeasured(int measureSpec, int desired) {     int result = 0;     int specSize = MeasureSpec.getSize(measureSpec);     switch (MeasureSpec.getMode(measureSpec)) {     case MeasureSpec.UNSPECIFIED:       result = desired;       break;     case MeasureSpec.AT_MOST:       result = Math.min(specSize, desired);       break;     case MeasureSpec.EXACTLY:     default:       result = specSize;     }     return result;   } } 

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"   xmlns:tools="http://schemas.android.com/tools"   android:layout_width="match_parent"   android:layout_height="match_parent"   android:background="@drawable/bgp"   tools:context="com.zihao.radar.MainActivity" >    <com.zihao.radar.view.RadarView     android:id="@+id/radar_view"     android:layout_width="600px"     android:layout_height="600px"     android:layout_centerInParent="true" />  </RelativeLayout>