如何转换文本文件以便放置在我的 acharengine 数组中？
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【中文标题】如何转换文本文件以便放置在我的 acharengine 数组中？【英文标题】：How to convert text file in order to be placed in my acharengine array? 【发布时间】：2016-05-22 09:58:27 【问题描述】：所以我有两个名为ReadFromFile（由@Pankaj Nimgade 提供）和MainActivity 的类来导入和读取我的test.txt。我希望使用库 achartengine 在我的应用程序中读取文本文件上的整数。它们必须被格式化以放入 int[] force_l 和 int[] force_r: 你能帮我按照我需要的方式格式化整数以及如何将它们放在 int[] force_l 和 int[] force_r 中吗？
private void openChart()
int[] x = 0,1,2,3,4,5,6,7,8,9,10;
int[] force_l = 0,25,24,25,15,16,17,25,24,21,24; //replace this values with the ones from the text file
int[] force_r = 0,48,36,26,43,45,30,33,33,28,42; //replace this values with the ones from the text file
test.txt 有两行：
0 25 24 25 15 16 17 25 24 21 24
0 48 36 26 43 45 30 33 33 28 42
现在，如何从 ReadFromFile 传递整数字符串以在 MainActivity 中读取？
@Pankaj Nimgade 提供的 ReadFromFile 类：
import org.apache.commons.io.FileUtils;
import java.io.File;
import java.util.Arrays;
import java.util.List;
public class ReadFromFile
public static void main(String[] args)
int[] force_l = null;
int[] force_r = null;
try
File file = new File("test.txt");
List<String> strings = FileUtils.readLines(file);
int count = 0;
for (String s : strings)
String[] integer_Strings = s.split(" ");
if (count == 0)
force_l = new int[integer_Strings.length];
for (int i = 0; i < integer_Strings.length; i++)
force_l[i] = Integer.parseInt(integer_Strings[i]);
count++;
else if (count == 1)
force_r = new int[integer_Strings.length];
for (int i = 0; i < integer_Strings.length; i++)
force_r[i] = Integer.parseInt(integer_Strings[i]);
System.out.println(Arrays.toString(force_l));
System.out.println(Arrays.toString(force_r));
catch (Exception e)
e.printStackTrace();
MainActivity 类：
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Typeface;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;
import org.achartengine.ChartFactory;
import org.achartengine.model.XYMultipleSeriesDataset;
import org.achartengine.model.XYSeries;
import org.achartengine.renderer.BasicStroke;
import org.achartengine.renderer.XYMultipleSeriesRenderer;
import org.achartengine.renderer.XYSeriesRenderer;
public class MainActivity extends AppCompatActivity
private View mChart;
private String[] mTime = new String[]
"0",
"1","2","3","4","5","6","7","8","9","10",
;
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Getting reference to the button btn_chart
Button btnChart = (Button) findViewById(R.id.btn_chart);
// Defining click event listener for the button btn_chart
View.OnClickListener clickListener = new View.OnClickListener()
@Override
public void onClick(View v)
// Draw the Chart
openChart();
;
// Setting event click listener for the button btn_chart of the SensorGraph layout
btnChart.setOnClickListener(clickListener);
private void openChart()
int[] x = 0,1,2,3,4,5,6,7,8,9,10;
int[] force_l;
int[] force_r;
// Creating an XYSeries for Right Force
XYSeries force_rSeries = new XYSeries("Force R (N)");
// Creating an XYSeries for Left Force
XYSeries force_lSeries = new XYSeries("Force L (N)");
// Adding data to Force Series
for (int i = 0; i < x.length; i++)
force_lSeries.add(i, force_l[i]);
force_rSeries.add(i, force_r[i]);
// Creating a dataset to hold each series
XYMultipleSeriesDataset dataset = new XYMultipleSeriesDataset();
// Adding Left Force Series to dataset
dataset.addSeries(force_lSeries);
// Adding Right Force Series to the dataset
dataset.addSeries(force_rSeries);
// Creating XYSeriesRenderer to customize Force R Series
XYSeriesRenderer force_rRenderer = new XYSeriesRenderer();
force_rRenderer.setColor(Color.RED); //color of the graph set to green
force_rRenderer.setFillPoints(true);
force_rRenderer.setLineWidth(2f);
force_rRenderer.setDisplayChartValues(false);
//setting chart value distance
// force_rRenderer.setDisplayChartValuesDistance(10);
//setting line graph point style to circle
// force_rRenderer.setPointStyle(PointStyle.CIRCLE);
//setting stroke of the line chart to solid
force_rRenderer.setStroke(BasicStroke.SOLID);
// Creating XYSeriesRenderer to customize Force L Series
XYSeriesRenderer force_lRenderer = new XYSeriesRenderer();
force_lRenderer.setColor(Color.BLUE);
force_lRenderer.setFillPoints(true);
force_lRenderer.setLineWidth(2f);
force_lRenderer.setDisplayChartValues(false);
//setting line graph point style to circle
// force_lRenderer.setPointStyle(PointStyle.SQUARE);
//setting stroke of the line chart to solid
force_lRenderer.setStroke(BasicStroke.SOLID);
// Creating a XYMultipleSeriesRenderer to customize the whole chart
XYMultipleSeriesRenderer multiRenderer = new XYMultipleSeriesRenderer();
multiRenderer.setXLabels(0);
//multiRenderer.setChartTitle("High Speed");
multiRenderer.setXTitle("time (s)");
multiRenderer.setYTitle("Force (N)");
/***
* Customizing graphs
*/
//setting text size of the title
multiRenderer.setChartTitleTextSize(28);
//setting text size of the axis title
multiRenderer.setAxisTitleTextSize(24);
//setting text size of the graph lable
multiRenderer.setLabelsTextSize(24);
//setting zoom buttons visiblity
multiRenderer.setZoomButtonsVisible(false);
//setting pan enablity which uses graph to move on both axis
multiRenderer.setPanEnabled(false, false);
//setting click false on graph
multiRenderer.setClickEnabled(false);
//setting zoom to false on both axis
multiRenderer.setZoomEnabled(false, false);
//setting lines to display on y axis
multiRenderer.setShowGridY(true);
//setting lines to display on x axis
multiRenderer.setShowGridX(true);
//setting legend to fit the screen size
multiRenderer.setFitLegend(true);
//setting displaying line on grid
multiRenderer.setShowGrid(true);
//setting zoom to false
multiRenderer.setZoomEnabled(false);
//setting external zoom functions to false
multiRenderer.setExternalZoomEnabled(false);
//setting displaying lines on graph to be formatted(like using graphics)
multiRenderer.setAntialiasing(true);
//setting to in scroll to false
multiRenderer.setInScroll(false);
//setting to set legend height of the graph
multiRenderer.setLegendHeight(30);
//setting x axis label align
multiRenderer.setXLabelsAlign(Paint.Align.CENTER);
//setting y axis label to align
multiRenderer.setYLabelsAlign(Paint.Align.LEFT);
//setting text style
multiRenderer.setTextTypeface("sans_serif", Typeface.NORMAL);
//setting no of values to display in y axis
multiRenderer.setYLabels(10);
// setting y axis max value, Since i'm using static values inside the graph so i'm setting y max value to 60.
// if you use dynamic values then get the max y value and set here
multiRenderer.setYAxisMin(0);
multiRenderer.setYAxisMax(80);
multiRenderer.setXLabels(4);
//setting used to move the graph on xaxis to 0 to the right
multiRenderer.setXAxisMin(0);
//setting used to move the graph on xaxis to 0 to the right
multiRenderer.setXAxisMax(61);
//setting bar size or space between two bars
//multiRenderer.setBarSpacing(0.5);
//Setting background color of the graph to transparent
multiRenderer.setBackgroundColor(Color.TRANSPARENT);
//Setting margin color of the graph to transparent
multiRenderer.setMarginsColor(Color.argb(0x00, 0x01, 0x01, 0x01));
multiRenderer.setApplyBackgroundColor(true);
multiRenderer.setScale(2f);
//setting x axis point size
multiRenderer.setPointSize(4f);
//setting the margin size for the graph in the order top, left, bottom, right
multiRenderer.setMargins(new int[]30, 30, 30, 30);
/*for(int i=0; i< x.length;i++)
multiRenderer.addXTextLabel(i, mTime[i]);
*/
// Adding Force L Renderer and Force R Renderer to multipleRenderer
// Note: The order of adding dataseries to dataset and renderers to multipleRenderer
// should be same
multiRenderer.addSeriesRenderer(force_lRenderer);
multiRenderer.addSeriesRenderer(force_rRenderer);
//this part is used to display graph on the xml
LinearLayout chartContainer = (LinearLayout) findViewById(R.id.chart);
//remove any views before u paint the chart
chartContainer.removeAllViews();
//drawing bar chart
mChart = ChartFactory.getLineChartView(MainActivity.this, dataset, multiRenderer);
//adding the view to the linearlayout
chartContainer.addView(mChart);
【问题讨论】：
上面的代码遇到了什么问题？ 问题是我不知道如何以我需要的方式格式化文本文件中的值，也不知道如何将它们导入 int[] force_l 和 int [] force_r 【参考方案1】：你应该注意的事情是你得到单独的行，整数行用空格分隔，你可以从这里生成一个String 数组，像这样String[] integer_Strings = s.split(" "); 现在你有每个整数的字符串值，你可以像 Integer.parseInt("2") 一样将此字符串值转换为 int。此方法在int 2中返回2，代码也可在github中找到
int[] force_l = null;
int[] force_r = null;
try
File file = new File("file_json_test_three.txt");
Path path = file.toPath();
List<String> strings = Files.readAllLines(path);
//List<String> strings = FileUtils.readLines(file); can be used with common-io-2.4 library
int count = 0;
for (String s : strings)
//System.out.println(s);
String[] integer_Strings = s.split(" ");
//System.out.println(Arrays.deepToString(integer_Strings));
if (count == 0)
force_l = new int[integer_Strings.length];
for (int i = 0; i < integer_Strings.length; i++)
force_l[i] = Integer.parseInt(integer_Strings[i]);
count++;
else if (count == 1)
force_r = new int[integer_Strings.length];
for (int i = 0; i < integer_Strings.length; i++)
force_r[i] = Integer.parseInt(integer_Strings[i]);
System.out.println(Arrays.toString(force_l));
System.out.println(Arrays.toString(force_r));
catch (Exception e)
e.printStackTrace();
输出
[0, 25, 24, 25, 15, 16, 17, 25, 24, 21, 24]
[0, 48, 36, 26, 43, 45, 30, 33, 33, 28, 42]
【讨论】：
谢谢。它说“无法解析方法'toPath（）'，我在谷歌中找不到答案 @JoãoAmaro，它应该可以在 java 中工作，或者你可以试试 common-io-2.4 库，注释代码可以工作，代码在这里可用，github.com/pankajnimgade/JavaCoding_tutorials/blob/master/src/… 如果你愿意下载项目并运行它 @JoãoAmaro, java.io.File 你需要为 File 导入，你的 JDK 应该是 1.8 才能使用这个方法。或者您可以添加项目中可用的库（common-io-2.4） 升级到1.8后仍然无法在Android Studio中使用。那么如果我添加“common-io-2.4”，我应该评论什么，我应该取消评论什么？ 注释这一行，Path path = file.toPath(); List使用 BufferedReader 逐行读取输入文件（请参阅此答案How to get file read line by line），并为每一行在“”（空格）上进行拆分
String line = "0 25 24 25 15 16 17 25 24 21 24"; /* this should be the line from file*/
String[] force_l = line.split(" ");
force_l[0]; // this will contain "0"
force_l[1]; // this will contain " 25"
然后你可以将值转换为 int 像
Integer.parseInt(force_l[0])
同样将文件添加到资产中，你可以很容易地不使用像“C:/test.txt”这样的绝对路径
【讨论】：
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