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 mPointArray = new ArrayList();// 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  
   * 
   * @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; 
  } 
}