我正在尝试使用2个图表视图来显示加速度计和陀螺仪数据。图表工作但我得到以下错误，随机发生。
java.util.ConcurrentModificationException
at java.util.ArrayList$ArrayListIterator.next(ArrayList.java:573)
at com.jjoe64.graphview.series.BaseSeries$1.next(BaseSeries.java:236)
at com.jjoe64.graphview.series.BaseSeries$1.next(BaseSeries.java:186)
at com.jjoe64.graphview.series.LineGraphSeries.draw(LineGraphSeries.java:255)
at com.jjoe64.graphview.GraphView.drawGraphElements(GraphView.java:301)
at com.jjoe64.graphview.GraphView.onDraw(GraphView.java:323)
at android.view.View.draw(View.java:16187)
at android.view.View.updateDisplayListIfDirty(View.java:15184)
at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3593)
at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3573)
at android.view.View.updateDisplayListIfDirty(View.java:15144)
at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3593)
at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3573)
at android.view.View.updateDisplayListIfDirty(View.java:15144)
at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3593)
at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3573)
at android.view.View.updateDisplayListIfDirty(View.java:15144)
at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3593)
at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3573)
at android.view.View.updateDisplayListIfDirty(View.java:15144)
at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3593)
at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3573)
at android.view.View.updateDisplayListIfDirty(View.java:15144)
at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3593)
at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3573)
at android.view.View.updateDisplayListIfDirty(View.java:15144)
at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3593)
at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3573)
at android.view.View.updateDisplayListIfDirty(View.java:15144)
at android.view.ThreadedRenderer.updateViewTreeDisplayList(ThreadedRenderer.java:282)
at android.view.ThreadedRenderer.updateRootDisplayList(ThreadedRenderer.java:288)
at android.view.ThreadedRenderer.draw(ThreadedRenderer.java:323)
at android.view.ViewRootImpl.draw(ViewRootImpl.java:2623)
at android.view.ViewRootImpl.performDraw(ViewRootImpl.java:2442)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2075)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1115)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6023)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:858)
at android.view.Choreographer.doCallbacks(Choreographer.java:670)
at android.view.Choreographer.doFrame(Choreographer.java:606)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:844)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5461)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
我使用onSensorChanged来收集数据，使用Timer Task绘制图形。
public void onSensorChanged(SensorEvent event) {
if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
synchronized (locka) {
System.arraycopy(event.values, 0, accSample, 0, 3);
}
}
else if (event.sensor.getType() == Sensor.TYPE_GYROSCOPE) {
synchronized (lockgy) {
System.arraycopy(event.values, 0, gyroSample, 0, 3);
}
}
}
计时器任务。预定每秒4次。
private class SampleTask extends TimerTask{
DataPoint ax;
DataPoint ay;
DataPoint az;
DataPoint gx;
DataPoint gy;
DataPoint gz;
final int MAX_DP = 40;
SampleTask(){
super();
timer.start();
}
@Override
public void run() {
long lTime = timer.getTime();
double time = ((double)lTime)/1000.0;
synchronized (locka) {
ax = new DataPoint(time,accSample[0]);
ay = new DataPoint(time,accSample[1]);
az = new DataPoint(time,accSample[2]);
}
synchronized (lockgy) {
gx = new DataPoint(time,gyroSample[0]);
gy = new DataPoint(time,gyroSample[1]);
gz = new DataPoint(time,gyroSample[2]);
}
accX.appendData(ax,true,MAX_DP);
accY.appendData(ay,true,MAX_DP);
accZ.appendData(az,true,MAX_DP);
gyroX.appendData(gx,true,MAX_DP);
gyroY.appendData(gy,true,MAX_DP);
gyroZ.appendData(gz,true,MAX_DP);
}
}
图表初始化（在onCreate()内）
accGraph = (GraphView)findViewById(R.id.acc_graph);
accGraph.getViewport().setXAxisBoundsManual(true);
accGraph.getViewport().setMinX(0);
accGraph.getViewport().setMaxX(10);
accX= new LineGraphSeries<>();
accY= new LineGraphSeries<>();
accZ= new LineGraphSeries<>();
accX.setColor(Color.RED);
accY.setColor(Color.GREEN);
accZ.setColor(Color.BLUE);
accX.setTitle("X");
accY.setTitle("Y");
accZ.setTitle("Z");
accX.setThickness(LINE_T);
accY.setThickness(LINE_T);
accZ.setThickness(LINE_T);
accGraph.addSeries(accX);
accGraph.addSeries(accY);
accGraph.addSeries(accZ);
accGraph.setTitle("Accel");
gyroGraph = (GraphView)findViewById(R.id.gyro_graph);
gyroGraph.getViewport().setXAxisBoundsManual(true);
gyroGraph.getViewport().setMinX(0);
gyroGraph.getViewport().setMaxX(10);
gyroX= new LineGraphSeries<>();
gyroY= new LineGraphSeries<>();
gyroZ= new LineGraphSeries<>();
gyroX.setColor(Color.RED);
gyroY.setColor(Color.GREEN);
gyroZ.setColor(Color.BLUE);
gyroX.setTitle("X");
gyroY.setTitle("Y");
gyroZ.setTitle("Z");
gyroX.setThickness(LINE_T);
gyroY.setThickness(LINE_T);
gyroZ.setThickness(LINE_T);
gyroGraph.addSeries(gyroX);
gyroGraph.addSeries(gyroY);
gyroGraph.addSeries(gyroZ);
gyroGraph.setTitle("Gyro");
答案 0 :(得分：2)
我找到了解决方案。
使用带有theme_fivethirtyeight()的{{1}}代替TimerTask来处理异常。
Runnable