第二阶段团队冲刺（三）
| 认领任务 | 实现数据关联，将体重的变化生成折线图显示 |
| 预计耗时 | 3h |
| 实际耗时 | 3.5h |
| 遇到的困难 | 统计图数据传值出现问题 |
| 问题解决情况 | 利用json格式传值，然后将json转换成list格式。成功解决 |
折线图效果：
xml代码：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:orientation="horizontal" android:layout_width="match_parent" android:layout_height="wrap_content"> <lecho.lib.hellocharts.view.LineChartView android:id="@+id/line_chart" android:layout_width="wrap_content" android:layout_height="match_parent" android:background="#ffffff" android:padding="25dp" /> <ListView android:visibility="gone" android:divider="@null" android:scrollbars="none" android:layout_marginTop="15dp" android:id="@+id/listview" android:layout_width="match_parent" android:layout_height="match_parent" /> </LinearLayout>
ChartActivity代码：
package com.example.myapplication5; import android.app.Activity; import android.content.Intent; import android.graphics.Color; import android.os.AsyncTask; import android.os.Bundle; import android.text.TextUtils; import android.view.View; import android.widget.ListView; import android.widget.Toast; import com.alibaba.fastjson.JSON; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStream; import java.net.HttpURLConnection; import java.net.MalformedURLException; import java.net.URL; import java.util.ArrayList; import java.util.Arrays; import java.util.List; import lecho.lib.hellocharts.gesture.ZoomType; import lecho.lib.hellocharts.model.Axis; import lecho.lib.hellocharts.model.AxisValue; import lecho.lib.hellocharts.model.Line; import lecho.lib.hellocharts.model.LineChartData; import lecho.lib.hellocharts.model.PointValue; import lecho.lib.hellocharts.model.ValueShape; import lecho.lib.hellocharts.model.Viewport; import lecho.lib.hellocharts.view.LineChartView; public class ListActivity extends Activity { private ListView listview; private LineChartView lineChart; private List<Chart> list; private String[] Message= new String[100]; String[] date ; float [] score; private List<PointValue> mPointValues = new ArrayList<PointValue>(); private List<AxisValue> mAxisXValues = new ArrayList<AxisValue>(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.chart); //initView(); CMessagePost(); /* list=JSON.parseArray(Arrays.toString(Message), Chart.class); date=new String[list.size()]; score=new float[list.size()]; for (int i=0;i<list.size();i++){ date[i]="i"; score[i]=Float.parseFloat(list.get(i).getWeight()); } getAxisXLables(); getAxisPoints(); initLineChart();*/ } private void initLineChart(){ Line line = new Line(mPointValues).setColor(Color.parseColor("#FFCD41")); List<Line> lines = new ArrayList<Line>(); line.setShape(ValueShape.CIRCLE); //折线图上每个数据点的形状，这里是圆形 line.setCubic(false); line.setFilled(false); line.setHasLabels(true); line.setHasLines(true); line.setHasPoints(true); lines.add(line); LineChartData data = new LineChartData(); data.setLines(lines); //坐标轴 Axis axisX = new Axis(); axisX.setHasTiltedLabels(true); axisX.setTextColor(Color.parseColor("#D6D6D9"));//设置字体颜色 axisX.setTextSize(8);//设置字体大小 axisX.setMaxLabelChars(8);//最多几个X轴坐标 axisX.setValues(mAxisXValues); data.setAxisXBottom(axisX); axisX.setHasLines(true); Axis axisY = new Axis(); axisY.setName(""); axisY.setTextSize(8); data.setAxisYLeft(axisY); //设置行为属性，缩放、滑动、平移 lineChart.setInteractive(true); lineChart.setZoomType(ZoomType.HORIZONTAL); lineChart.setMaxZoom((float) 3); lineChart.setLineChartData(data); lineChart.setVisibility(View.VISIBLE); //设置X轴数据的显示个数（x轴0-7个数据） Viewport v = new Viewport(lineChart.getMaximumViewport()); v.left = 0; v.right= 7; lineChart.setCurrentViewport(v); } private void initView() { listview=(ListView) findViewById(R.id.listview); lineChart = (LineChartView)findViewById(R.id.line_chart); } private void getAxisXLables(){ for (int i = 0; i < date.length; i++) { mAxisXValues.add(new AxisValue(i).setLabel(date[i])); } } private void getAxisPoints(){ for (int i = 0; i < score.length; i++) { mPointValues.add(new PointValue(i, score[i])); } } public void CMessagePost(){ //获取用户名的值 String name = getIntent().getStringExtra("name"); //获取密码的值 //判断用户名或密码是否为空 if(TextUtils.isEmpty(name)){ Toast.makeText(getApplicationContext(),"用户名为空",Toast.LENGTH_LONG).show();//Toast }else{ //获取网络上的servlet路径 String path="http://10.0.2.2:8080/testhttp/MChart.Servlet"; //调用postTask,把获取到的用户名，密码与路径放入方法中 new ListActivity.postTask().execute(name,path);}//Params：开始异步任务执行时传入的参数类型，对应excute（）中传递的参数 } class postTask extends AsyncTask { @Override protected Object doInBackground(Object[] params) { //依次获取用户名，密码与路径 String name = params[0].toString(); String path = params[1].toString(); try { //获取网络上get方式提交的整个路径 URL url = new URL(path); //打开网络连接 HttpURLConnection conn = (HttpURLConnection) url.openConnection(); //设置提交方式 conn.setRequestMethod("POST"); //设置网络超时时间 conn.setConnectTimeout(5000); //界面上所有的参数名加上他的值 String s = "name=" + name; //获取请求头 conn.setRequestProperty("Content-Length", s.length() + "");//键是固定的 conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");//键和值是固定的 //设置允许对外输出数据 conn.setDoOutput(true); //把界面上的所有数据写出去 OutputStream os = conn.getOutputStream(); os.write(s.getBytes()); if (conn.getResponseCode() == 200) { //用io流与web后台进行数据交互 InputStream is = conn.getInputStream(); //字节流转字符流 BufferedReader br = new BufferedReader(new InputStreamReader(is)); //读出每一行的数据 String str = br.readLine(); //返回读出的每一行的数据 return str; } } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return null; } @Override protected void onPostExecute(Object o) { super.onPostExecute(o); //获取Android studio与web后台数据交互获得的值 String s = (String) o; System.out.println(s); initView(); list=JSON.parseArray(s,Chart.class); date=new String[list.size()]; score=new float[list.size()]; for (int i=0;i<list.size();i++){ date[i]="i"; score[i]=Float.parseFloat(list.get(i).getWeight()); } getAxisXLables(); getAxisPoints(); initLineChart(); } } }
