okhttp和linechart的应用：从http获取数据生成折线图 34 / 100
MainActivity类
package com.example.linecharthttp;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import android.annotation.SuppressLint;
import android.graphics.Color;
import android.graphics.Typeface;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
import com.github.mikephil.charting.charts.LineChart;
import com.github.mikephil.charting.components.Description;
import com.github.mikephil.charting.components.XAxis;
import com.github.mikephil.charting.components.YAxis;
import com.github.mikephil.charting.data.Entry;
import com.github.mikephil.charting.data.LineData;
import com.github.mikephil.charting.data.LineDataSet;
public class MainActivity extends AppCompatActivity {
private static final String TAG = "MainActivity";
private final OkHttpClient okHttpClient = new OkHttpClient();
private Button mGetNumberButton;
private Button mGetDataButton;
private LineChart mLineChart;
private List<Entry> mListOne = new ArrayList<>();
@SuppressLint("MissingInflatedId")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mLineChart = findViewById(R.id.lineChart);
mGetNumberButton = findViewById(R.id.getNumberButton);
mGetNumberButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
GetNumber();
}
});
mGetDataButton = findViewById(R.id.getDataButton);
mGetDataButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
doGetAsync();
}
});
}
public int GetNumber() {
Request request = new Request.Builder()
.url("http://192.xxx.x.x:xxxx/PlotData/Size")
.build();
Call call = okHttpClient.newCall(request);
call.enqueue(new Callback() {
@Override
public void onFailure(@NonNull Call call, @NonNull IOException e) {
Log.e(TAG, "失败");
}
@Override
public void onResponse(@NonNull Call call, @NonNull Response response) throws IOException {
String string = response.body().string();
String[] dataBuf_FirstLine = string.split(",");
String[] Datasize = dataBuf_FirstLine[0].split(":");
String size = Datasize[1];
Log.e(TAG, "数据长度为：" + size);
}
});
return 0;
}
public void doGetAsync() {
Request request = new Request.Builder()
.url("http://192.xxx.x.x:xxxx/PlotData/P1")
.build();
Call call = okHttpClient.newCall(request);
call.enqueue(new Callback() {
@Override
public void onFailure(@NonNull Call call, @NonNull IOException e) {
Log.e(TAG, "失败");
}
@Override
public void onResponse(@NonNull Call call, @NonNull Response response) throws IOException {
String string = response.body().string();
String[] dataBuf_FirstLine = string.split("\":");
String[] volt = dataBuf_FirstLine[4].split(",");
volt[10] = "3.892264";
volt[0] = "3.892206";
ArrayList listone = new ArrayList<>(volt.length);
Collections.addAll(listone, volt);
listone.remove(1);
listone.remove(10);//上面删除一个，最后一个就是第10个
String[] date = dataBuf_FirstLine[2].split(",");
date[0] = "00:00:00:020";
date[9] = "00:00:00:920";
ArrayList listtow = new ArrayList<>(date.length);
Collections.addAll(listtow, date);
listtow.remove(10);
TextData textData = new TextData();
for (int i = 0; i < listtow.size(); i++) {
String strDateTime = (String) listtow.get(i);
String strValue1 = (String) listone.get(i);
textData.setTestDateTime(strDateTime);
textData.setVolt(Double.parseDouble(strValue1));
mListOne.add(new Entry(i, (float) textData.getVolt()));
}
initChart();
initChartBackground();
Log.e(TAG, listone.toString());
}
});
}
private void initChartBackground() {
Description description = null;
//设置描述
description = new Description();
description.setEnabled(true);//设置是否启用标题
description.setText("测试时间-电压-电流曲线");//设置标题文本
description.setTextSize(20);//设置文本大小
description.setTypeface(Typeface.MONOSPACE);//设置文本字体样式
description.setTextColor(Color.BLACK);//设置文本颜色
description.setXOffset(10f);//设置X轴的偏移量，float值
description.setYOffset(10f);//设置Y轴的偏移量，float值
//mLineChart.setBackgroundColor(Color.BLACK);
// description.setTextAlign(Paint.Align.CENTER);//提示框的文本对齐,中心对齐
description.setPosition(350, 30);//设置描述所处的位置
mLineChart.setDescription(description);//添加给LineChart
// mLineChart.setNoDataText("暂无数据"); // 没有数据时样式
XAxis xAxis = mLineChart.getXAxis();//得到x轴
xAxis.setDrawAxisLine(true);//是否绘制轴线
xAxis.setDrawGridLines(true);//设置x轴上每个点对应的线
xAxis.setDrawLabels(true);//绘制标签 指x轴上的对应数值
xAxis.setPosition(XAxis.XAxisPosition.BOTTOM);//设置x轴的位置，在整个图形的底部
xAxis.setLabelCount(mListOne.size(), true); //设置X轴刻度 第一个参数是想要x轴有多少条刻度,第二个参数true是将刻度数设置为你的第一个参数的数量 ，false是将刻度数设置为你的第一个参数的数量+1（0.0点也要算哦）
xAxis.setGranularity(1f);//设置x轴坐标间的最小间距
xAxis.setAxisMaximum(mListOne.size() + 1);//设置x轴的最大范围
// xAxis.setAxisMinimum(0f);//设置x轴的最小范围
//xAxis.setGridColor(Color.TRANSPARENT);//设置x轴刻度透明
//Y轴不是有左右两边嘛，这就是获取左右两边的y轴
YAxis axisLeft = mLineChart.getAxisLeft();
// axisRight.setEnabled(false);//将右边的y轴隐藏
//y轴最大值最小值范围
// axisLeft.setAxisMaximum(550f);
//axisLeft.setAxisMinimum(0f);
axisLeft.setTextColor(Color.parseColor("#000000"));//设置左y轴字的颜色
axisLeft.setAxisLineColor(Color.BLACK);//y轴颜色
axisLeft.setGridColor(Color.parseColor("#C0C0C0"));//y轴线颜色
axisLeft.enableGridDashedLine(10f, 10f, 0f);
}
private void initChart() {
LineDataSet one = new LineDataSet(mListOne, "电压");//将数据赋值到你的线条上
one.setColor(Color.parseColor("#67BCFF"));//设置线的颜色
one.setDrawCircles(false);//设置是否绘制点，默认是true
one.setDrawValues(false);//是否绘制点上的文字，默认为true
LineData lineData = new LineData();// //线的总管理
lineData.addDataSet(one);//每加一条就add一次
mLineChart.setData(lineData);//把线条设置给你的lineChart上
mLineChart.invalidate();//刷新
}
}
TextData类
package com.example.linecharthttp;
public class TextData {
String mTestDateTime; // 测试记录点日期时间
double mVolt; // 电压(double)
public TextData() {
}
public String getTestDateTime() {
return mTestDateTime;
}
public void setTestDateTime(String testDateTime) {
mTestDateTime = testDateTime;
}
public double getVolt() {
return mVolt;
}
public void setVolt(double volt) {
mVolt = volt;
}
public TextData(String testDateTime, double volt) {
mTestDateTime = testDateTime;
mVolt = volt;
}
@Override
public String toString() {
return "测试时间-电压曲线数据：" +
"测试时间为：" + mTestDateTime + '\'' +
", 测试电压为：" + mVolt +
'}';
}
}
activity
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">
<com.github.mikephil.charting.charts.LineChart
android:id="@+id/lineChart"
android:layout_width="match_parent"
android:layout_height="500dp"
tools:ignore="MissingClass">
</com.github.mikephil.charting.charts.LineChart>
<Button
android:id="@+id/getNumberButton"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="获取数量"
android:layout_marginTop="50dp"/>
<Button
android:id="@+id/getDataButton"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="获取数据并生成曲线"
android:layout_marginTop="30dp"/>
</LinearLayout>
效果
需要加的依赖
这个没有依据，都是我自己会用到的，具体加那些看自己代码需要
implementation 'com.github.PhilJay:MPAndroidChart:v3.0.3'
def dialogx_version = "0.0.46"
implementation 'com.readystatesoftware.sqliteasset:sqliteassethelper:+'
implementation 'androidx.sqlite:sqlite:2.2.0'
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.google.code.gson:gson:2.7'
implementation 'com.alibaba:fastjson:1.2.67'
implementation("com.squareup.okhttp3:okhttp:4.10.0")
AndroidManifest.xml
也是按我自己需要的添加
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools">
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<application
android:allowBackup="true"
android:dataExtractionRules="@xml/data_extraction_rules"
android:fullBackupContent="@xml/backup_rules"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/Theme.LineChartHttp"
android:usesCleartextTraffic="true"
tools:targetApi="31">
<activity
android:name=".MainActivity"
android:exported="true">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
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