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我想在许多地理点之间绘制直线路径作为给定的代码.....但是如果我尝试放大地图 ConcurrentModificationException 发生，请帮助我......我对 android 很陌生......

//this is the methode to draw path
 public void draw_path(View view) {
     if(timer!=null)
         timer.cancel();

      timerpath = new Timer();
      timerpath.scheduleAtFixedRate(new TimerTask(){
          int i=0;
        @Override
        public void run() {
            // TODO Auto-generated method stub
             List<Overlay> mapOverlays = mapView.getOverlays();

             if(i<replaydata.length-2){
                 GeoPoint point=new GeoPoint((int) (Float.parseFloat(replaydata[i].split("~")[0]) * 1E6),(int) (Float.parseFloat(replaydata[i].split("~")[1])* 1E6));
                 GeoPoint point2=new GeoPoint((int) (Float.parseFloat(replaydata[i+1].split("~")[0]) * 1E6),(int) (Float.parseFloat(replaydata[i+1].split("~")[1])* 1E6));

                 mapOverlays.add(new PathOverlay(point2, point));
                 mapView.postInvalidate();
                 i=i+1;
             }
             }


        }, 50, 500);

    }
//this is the PathOverlay Class
package com.suneeltectonics.tracking;

import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Point;
import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapView;
import com.google.android.maps.Overlay;
import com.google.android.maps.Projection;
public class PathOverlay extends Overlay {
private GeoPoint gp1;
private GeoPoint gp2;

public PathOverlay(GeoPoint gp1, GeoPoint gp2) {
    this.gp1 = gp1;
    this.gp2 = gp2;
}

@Override
public boolean draw(Canvas canvas, MapView mapView, boolean shadow,
        long when) {
    // TODO Auto-generated method stub
    Projection projection = mapView.getProjection();
    if (shadow == false) {

        Paint paint = new Paint();
        paint.setAntiAlias(true);
        Point point = new Point();
        projection.toPixels(gp1, point);
        paint.setColor(Color.RED);
        Point point2 = new Point();
        projection.toPixels(gp2, point2);
        paint.setStrokeWidth(6);
        canvas.drawLine((float) point.x, (float) point.y, (float) point2.x,
                (float) point2.y, paint);
    }
    return super.draw(canvas, mapView, shadow, when);
}

@Override
public void draw(Canvas canvas, MapView mapView, boolean shadow) {
    // TODO Auto-generated method stub

    super.draw(canvas, mapView, shadow);
}

}
 //this is the crash log
 07-26 17:42:30.850: WARN/dalvikvm(2173): threadid=1: thread exiting with uncaught exception (group=0x400207d8)
 07-26 17:42:30.870: ERROR/AndroidRuntime(2173): FATAL EXCEPTION: main
 07-26 17:42:30.870: ERROR/AndroidRuntime(2173): java.util.ConcurrentModificationException
07-26 17:42:30.870: ERROR/AndroidRuntime(2173):     at java.util.ArrayList$ArrayListIterator.next(ArrayList.java:573)
 07-26 17:42:30.870: ERROR/AndroidRuntime(2173):     at com.google.android.maps.OverlayBundle.draw(OverlayBundle.java:44)
07-26 17:42:30.870: ERROR/AndroidRuntime(2173):     at com.google.android.maps.MapView.onDraw(MapView.java:494)
07-26 17:42:30.870: ERROR/AndroidRuntime(2173):     at android.view.View.draw(View.java:6740)
07-26 17:42:30.870: ERROR/AndroidRuntime(2173):     at android.view.ViewGroup.drawChild(ViewGroup.java:1640)
07-26 17:42:30.870: ERROR/AndroidRuntime(2173):     at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367)
07-26 17:42:30.870: ERROR/AndroidRuntime(2173):     at android.view.View.draw(View.java:6743)
07-26 17:42:30.870: ERROR/AndroidRuntime(2173):     at android.view.ViewGroup.drawChild(ViewGroup.java:1640)
07-26 17:42:30.870: ERROR/AndroidRuntime(2173):     at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367)
07-26 17:42:30.870: ERROR/AndroidRuntime(2173):     at android.view.ViewGroup.drawChild(ViewGroup.java:1638)
07-26 17:42:30.870: ERROR/AndroidRuntime(2173):     at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367)

07-26 17:42:30.870: 错误/AndroidRuntime(2173): 在 android.view.ViewGroup.drawChild(ViewGroup.java:1638) 07-26 17:42:30.870: 错误/AndroidRuntime(2173): 在 android. view.ViewGroup.dispatchDraw(ViewGroup.java:1367) 07-26 17:42:30.870: 错误/AndroidRuntime(2173): 在 android.view.View.draw(View.java:6743) 07-26 17:42: 30.870: 错误/AndroidRuntime(2173): 在 android.widget.FrameLayout.draw(FrameLayout.java:352) 07-26 17:42:30.870: 错误/AndroidRuntime(2173): 在 com.android.internal.policy.impl .PhoneWindow$DecorView.draw(PhoneWindow.java:1842) 07-26 17:42:30.870: ERROR/AndroidRuntime(2173): at android.view.ViewRoot.draw(ViewRoot.java:1407) 07-26 17:42 :30.870: 错误/AndroidRuntime(2173): 在 android.view.ViewRoot.performTraversals(ViewRoot.java:1163) 07-26 17:42:30.870: 错误/AndroidRuntime(2173):在 android.view.ViewRoot.handleMessage(ViewRoot.java:1727) 07-26 17:42:30.870: 错误/AndroidRuntime(2173): 在 android.os.Handler.dispatchMessage(Handler.java:99) 07-26 17 :42:30.870: ERROR/AndroidRuntime(2173): at android.os.Looper.loop(Looper.java:123) 07-26 17:42:30.870: ERROR/AndroidRuntime(2173): at android.app.ActivityThread。 main(ActivityThread.java:4633) 07-26 17:42:30.870: ERROR/AndroidRuntime(2173): at java.lang.reflect.Method.invokeNative(Native Method) 07-26 17:42:30.870: ERROR/AndroidRuntime (2173): 在 java.lang.reflect.Method.invoke(Method.java:521) 07-26 17:42:30.870: 错误/AndroidRuntime(2173): 在 com.android.internal.os.ZygoteInit$MethodAndArgsCaller。运行（ZygoteInit.java:891）07-26 17:42:30.870：错误/AndroidRuntime（2173）：在 com.android.internal.os.ZygoteInit.main（ZygoteInit.java:649) 07-26 17:42:30.870: ERROR/AndroidRuntime(2173): at dalvik.system.NativeStart.main(Native Method) 07-26 17:42:30.920: WARN/ActivityManager(150): 强制完成活动 com.suneeltectonics.tracking/.ViewReplay

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1 回答 1

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由于对列表项的操作引发了异常......

这不是因为 ondraw 方法，而是因为你在每个时钟周期都在操作整个列表。这就是为什么当时钟周期很小时你有异常但是当它很大时你没有得到任何异常。

不要一直尝试重新填充和修改...方法无效，以便它可以重绘所有内容，但是由于您保留了非常小的修剪器持续时间，因此值会发生冲突...

于 2012-07-26T13:53:43.880 回答