Android雷达扫描动态界面制作

先看看效果图：

源码：

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>

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