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我正在做一個android的時間管理應用程序，我有活動和標籤類包含在它。每個活動都有一個標籤，而在Statistics片段中，我希望通過使用以下信息製作餅圖：用戶使用特定標籤做了多少活動。所以爲此，我已經將achartengine lib包含到了我的項目中，並且我確信它可以正常工作（使用默認輸入嘗試它），但是需要用戶輸入的信息。所以我把這些信息，並試圖賦予那些在我創建的陣列，但在這個過程中我的for循環我採取了錯誤=>分配數組期間IndexOutOfBoundsException
12-21 22：56：47.330 6861-6861/com.beter。 timehole E/AndroidRuntime： 致命例外：main 進程：com.beter.timehole，PID：6861 java.lang.ArrayIndexOutOfBoundsException：length = 2;索引= 2 在 com.beter.timehole.fragments.StatisticsFragment.initData（StatisticsFragment.java:112）
所以我展示其中for循環異常點的任何幫助表示讚賞。
package com.beter.timehole.fragments;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.app.Activity;
import android.graphics.Color;
import android.graphics.Paint.Align;
import android.graphics.Typeface;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AbsListView;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.Toast;
import org.achartengine.ChartFactory;
import org.achartengine.chart.BarChart.Type;
import org.achartengine.model.XYMultipleSeriesDataset;
import org.achartengine.model.XYSeries;
import org.achartengine.renderer.XYMultipleSeriesRenderer;
import org.achartengine.renderer.XYSeriesRenderer;
import org.achartengine.ChartFactory;
import org.achartengine.GraphicalView;
import org.achartengine.model.CategorySeries;
import org.achartengine.model.SeriesSelection;
import org.achartengine.renderer.DefaultRenderer;
import org.achartengine.renderer.SimpleSeriesRenderer;
import org.achartengine.ChartFactory;
import org.achartengine.GraphicalView;
import org.achartengine.chart.BarChart.Type;
import org.achartengine.model.CategorySeries;
import org.achartengine.model.XYMultipleSeriesDataset;
import org.achartengine.model.XYSeries;
import org.achartengine.renderer.DefaultRenderer;
import org.achartengine.renderer.SimpleSeriesRenderer;
import org.achartengine.renderer.XYMultipleSeriesRenderer;
import org.achartengine.renderer.XYSeriesRenderer;
import com.beter.timehole.R;
import java.io.FileInputStream;
import java.io.ObjectInputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Random;
public class StatisticsFragment extends Fragment {
private View mView;
private GraphicalView mGraphView;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.statistics_fragment, container, false);
mView = rootView;
initData();
return rootView;
}
private void initData() {
ArrayList<com.beter.timehole.core.Activity> activitiesArrayList = new ArrayList<com.beter.timehole.core.Activity>();
activitiesArrayList = readActivitiesFromFile();
ArrayList<String> temp = new ArrayList<String>();
int tagNumber=0;
for(int i=0;i<activitiesArrayList.size();i++)
{
if(i==0) {
temp.add(activitiesArrayList.get(i).getTag().getTagName());
tagNumber ++;
}
else if(temp.contains(activitiesArrayList.get(i).getTag().getTagName()))
{}
else
{
temp.add(activitiesArrayList.get(i).getTag().getTagName());
tagNumber ++;
}
}
String[] codename = new String[tagNumber];
Double[] values = new Double[tagNumber];
String[] colors = new String[tagNumber];
int j=1;
for(int i=0;i<activitiesArrayList.size();i++)
{
if(codename.length == 0) {
codename[0] = activitiesArrayList.get(i).getTag().getTagName();
values[0]=1.0;
}
else if(Arrays.asList(codename).contains(activitiesArrayList.get(i).getTag().getTagName()))
{
int index = java.util.Arrays.asList(codename).indexOf(activitiesArrayList.get(i).getTag().getTagName());
values[index]=values[index]+1;
}
else {
codename[j] = activitiesArrayList.get(i).getTag().getTagName();// It is where the error points(line no:112)
int index = java.util.Arrays.asList(codename).indexOf(activitiesArrayList.get(i).getTag().getTagName());
values[index]=1.0;
j++;
}
}
for(int i=0; i<codename.length;i++)
{
int integer =(int) (Math.random()*1000000);
String color = "#" + integer;
colors[i]= color;
}
CategorySeries series = new CategorySeries("Android Platform Version");
int length = codename.length;
for (int i = 0; i < length; i++)
series.add(codename[i], values[i]);
DefaultRenderer renderer = new DefaultRenderer();
for (int i = 0; i < length; i++) {
SimpleSeriesRenderer seriesRenderer = new SimpleSeriesRenderer();
seriesRenderer.setColor(Color.parseColor(colors[i]));
renderer.addSeriesRenderer(seriesRenderer);
}
renderer.setChartTitleTextSize(60);
renderer.setChartTitle("Android Platform Version");
renderer.setLabelsTextSize(30);
renderer.setLabelsColor(Color.GRAY);
renderer.setLegendTextSize(30);
drawChart(series, renderer);
}
private ArrayList<com.beter.timehole.core.Activity> readActivitiesFromFile(){
ArrayList<com.beter.timehole.core.Activity> activitiesFromFile = new ArrayList<>();
try{
FileInputStream activityFileInputStream = getContext().openFileInput("activityobjects.dat");
ObjectInputStream activityObjectInputStream = new ObjectInputStream(activityFileInputStream);
activitiesFromFile = (ArrayList<com.beter.timehole.core.Activity>)activityObjectInputStream.readObject();
activityObjectInputStream.close();
activityFileInputStream.close();
}
catch (Exception e){
e.printStackTrace();
}
return activitiesFromFile;
}
private void drawChart(CategorySeries series, DefaultRenderer renderer) {
if (null == mGraphView) {
mGraphView = ChartFactory.getPieChartView(getActivity(), series, renderer);
RelativeLayout container = (RelativeLayout) mView.findViewById(R.id.graph_container);
container.addView(mGraphView);
}
else
mGraphView.repaint();
}
}
根據你的錯誤信息，你會嘗試訪問'codename'數組中的第三個位置（索引'2'），但是'codename'的大小隻有'2'。真正由你來完成你的程序並找出爲什麼發生這種情況。 – sstan
是的，我知道，但我無法弄清楚，這個項目是爲了明天，所以我想也許這是另一個我看不到的問題，並決定在這裏上傳。但是，如果有人能夠幫助我，我仍然在思考這個問題，那會很好。謝謝。 – Cuthalion
爲什麼設置j = 1，codename.length = activitiesArrayList.size（）+ 1？ –