安卓雷达扫描动画效果实现

主程序：

package com.seehow.elabpupil.exp;import com.seehow.elabpupil.R;import com.seehow.elabpupil.view.RadarView;import android.annotation.SuppressLint;import android.app.Activity;import android.app.Dialog;import android.os.Bundle;import android.view.LayoutInflater;import android.view.View;import android.widget.LinearLayout;@SuppressLint("InflateParams")public class ExpW02  extends Activity{Dialog progressDialog;//ProgressDialog progressDialog;private RadarView mRadarView;@Overridepublic void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.expw02_main);findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {            progressDialog = new Dialog(ExpW02.this,R.style.bluetoothscan_dialog);//要在setContentView()前 否则会报空对象错误                        //progressDialog.setContentView(R.layout.bluetoothscan_dialog);                View content = LayoutInflater.from(ExpW02.this).inflate(R.layout.bluetoothscan_dialog, null);    LinearLayout layout = (LinearLayout) content.findViewById(R.id.dialog_view);    progressDialog.setContentView(layout, new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT));        mRadarView = (RadarView)  progressDialog.findViewById(R.id.radar_view);     mRadarView.setSearching(true);    mRadarView.addPoint();    mRadarView.addPoint();                progressDialog.setCancelable(true);                progressDialog.getWindow().setBackgroundDrawableResource(android.R.color.transparent);                //TextView msg = (TextView) progressDialog.findViewById(R.id.tipTextView);                //msg.setText("卖力加载中");                progressDialog.show();            }        });}}

把bluetoothscan_dialog样式加入values/styles.xml里

 <style name="bluetoothscan_dialog" parent="android:style/Theme.Dialog">          <item name="android:windowFrame">@null</item>          <item name="android:windowNoTitle">true</item>         <item name="android:background">@null</item>          <item name="android:windowBackground">@android:color/transparent</item>          <item name="android:windowIsFloating">true</item>          <item name="android:windowContentOverlay">@null</item>         <item name="android:windowIsTranslucent">true</item>         <item name="android:backgroundDimEnabled">false</item>    </style> 

expw02_main.xml放在layout布局文件夹里

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"              android:orientation="vertical"              android:layout_width="fill_parent"              android:layout_height="fill_parent"        >    <Button            android:id="@+id/button"            android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:text="点击显示progressdialog"            /></LinearLayout>

bluetoothscan_dialog.xml放入layout布局文件夹里

<?xml version="1.0" encoding="utf-8"?>  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"      android:id="@+id/dialog_view"       android:orientation="vertical"      android:layout_width="fill_parent"       android:layout_height="fill_parent"      android:minHeight="60dp"      android:minWidth="180dp"      android:gravity="center"      android:padding="10dp" >         <include layout="@layout/radarview" />        <TextView           android:id="@+id/tipTextView"          android:layout_width="wrap_content"           android:layout_height="wrap_content"        android:layout_marginTop="20dp"          android:layout_marginLeft="10dp"          android:text="蓝牙正在扫描,按返回键可停止扫描"        android:textColor="@color/white"        android:textSize="18.0sp"        android:textStyle="bold" />  </LinearLayout>  

radarview.xml放在layout布局文件夹里,注意<com.seehow.elabpupil.view.RadarView   />在src下对应的程序包里要有自定义的雷达控件类RadarView.java。

<?xml version="1.0" encoding="utf-8"?>    <com.seehow.elabpupil.view.RadarView        xmlns:android="http://schemas.android.com/apk/res/android"          android:id="@+id/radar_view"        android:layout_width="300dp"        android:layout_height="300dp"        android:layout_centerInParent="true" /> 

RadarView.java 雷达类放在src下的view子包com.seehow.elabpupil.view内

package com.seehow.elabpupil.view;import java.util.ArrayList;import java.util.List;import java.util.Random;import com.seehow.elabpupil.R;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;/** * @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mapprivate 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 stubinit(context);}public RadarView(Context context, AttributeSet attrs) {super(context, attrs);// TODO Auto-generated constructor stubinit(context);}public RadarView(Context context) {super(context);// TODO Auto-generated constructor stubinit(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). */@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {// TODO Auto-generated method stubsuper.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 */@Overrideprotected void onDraw(Canvas canvas) {// TODO Auto-generated method stubsuper.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(0xff259b24);// 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(0xff5677fc);canvas.drawCircle(mCx, mCy, mInsideRadius * 4, mPaint);// 开始绘制内3圆mPaint.setStyle(Style.STROKE);mPaint.setColor(0xffe7e9fd);//网格线颜色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);elsecanvas.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;}}

注意用到了

LayoutInflater来加载布局。

预览效果图：

图片素材：