讓Android中

Question

從數據庫MySQL的一個圖表我想要根據我使用JSON代碼我的數據庫的MySQL獲得了數據在Android中的圖表，這是我的代碼：

package android.bloodglucose.doctor; 

import java.io.BufferedReader; 
import java.io.ByteArrayOutputStream; 
import java.io.File; 
import java.io.FileOutputStream; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.util.ArrayList; 

import org.achartengine.ChartFactory; 
import org.achartengine.GraphicalView; 
import org.achartengine.chart.PointStyle; 
import org.achartengine.model.SeriesSelection; 
import org.achartengine.model.XYMultipleSeriesDataset; 
import org.achartengine.model.XYSeries; 
import org.achartengine.renderer.XYMultipleSeriesRenderer; 
import org.achartengine.renderer.XYSeriesRenderer; 
import org.achartengine.tools.PanListener; 
import org.achartengine.tools.ZoomEvent; 
import org.achartengine.tools.ZoomListener; 
import org.apache.http.HttpEntity; 
import org.apache.http.HttpResponse; 
import org.apache.http.NameValuePair; 
import org.apache.http.client.ClientProtocolException; 
import org.apache.http.client.HttpClient; 
import org.apache.http.client.entity.UrlEncodedFormEntity; 
import org.apache.http.client.methods.HttpPost; 
import org.apache.http.impl.client.DefaultHttpClient; 
import org.apache.http.message.BasicNameValuePair; 
import org.json.JSONArray; 
import org.json.JSONException; 
import org.json.JSONObject; 

import android.bloodglucose.doctor.R; 

import android.app.Activity; 
import android.database.Cursor; 
import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.graphics.Bitmap.CompressFormat; 
import android.graphics.Color; 
import android.os.Bundle; 
import android.os.Environment; 
import android.util.Log; 
import android.view.View; 
import android.view.ViewGroup.LayoutParams; 
import android.widget.ArrayAdapter; 
import android.widget.Button; 
import android.widget.LinearLayout; 
import android.widget.TextView; 
import android.widget.Toast; 

public class ChartBuilder extends Activity { 
    public static final String TYPE = "type"; 

    private XYMultipleSeriesDataset mDataset = new XYMultipleSeriesDataset(); 

    private XYMultipleSeriesRenderer mRenderer = new XYMultipleSeriesRenderer(); 

    private XYSeries mCurrentSeries; 

    private XYSeriesRenderer mCurrentRenderer; 

    private String mDateFormat; 

    private GraphicalView mChartView; 

    private String textResult; 

    private ArrayList<String> ids = new ArrayList<String>(); 
    private ArrayList<String> result = new ArrayList<String>(); 


    //private Button sendImage; 

    InputStream is; 

    String imageFilePath; 

    private int index=1; 

    @Override 
    protected void onRestoreInstanceState(Bundle savedState) { 
    super.onRestoreInstanceState(savedState);  
    mDataset = (XYMultipleSeriesDataset) savedState.getSerializable("dataset"); 
    mRenderer = (XYMultipleSeriesRenderer) savedState.getSerializable("renderer"); 
    mCurrentSeries = (XYSeries) savedState.getSerializable("current_series"); 
    mCurrentRenderer = (XYSeriesRenderer) savedState.getSerializable("current_renderer"); 
    mDateFormat = savedState.getString("date_format"); 
    } 

    @Override 
    protected void onSaveInstanceState(Bundle outState) { 
    super.onSaveInstanceState(outState); 
    outState.putSerializable("dataset", mDataset); 
    outState.putSerializable("renderer", mRenderer); 
    outState.putSerializable("current_series", mCurrentSeries); 
    outState.putSerializable("current_renderer", mCurrentRenderer); 
    outState.putString("date_format", mDateFormat); 
    } 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.xy_chart); 
    Button save = (Button)findViewById(R.id.saveChart); 

    mRenderer.setApplyBackgroundColor(true); 
    //mRenderer.setBackgroundColor(Color.WHITE); 
    mRenderer.setShowGrid(true); 
    mRenderer.setAxisTitleTextSize(16); 
    mRenderer.setChartTitleTextSize(20); 
    mRenderer.setLabelsTextSize(15); 
    mRenderer.setLegendTextSize(15); 
    //mRenderer.setMargins(new int[] { 20, 30, 15, 0 }); 
    mRenderer.setZoomButtonsVisible(true); 
    mRenderer.setPointSize(10); 

     XYSeries series = new XYSeries("Blood Sugar Increment (mg/dl)"); 
     mDataset.addSeries(series); 
     mCurrentSeries = series; 
     XYSeriesRenderer renderer = new XYSeriesRenderer(); 
     mRenderer.addSeriesRenderer(renderer); 
     renderer.setPointStyle(PointStyle.CIRCLE); 
     renderer.setFillPoints(true); 
     mCurrentRenderer = renderer; 



     cek(); 
      } 

    @Override 
    protected void onResume() { 
    super.onResume(); 
    if (mChartView == null) { 
     LinearLayout layout = (LinearLayout) findViewById(R.id.chart); 
     mChartView = ChartFactory.getLineChartView(this, mDataset, mRenderer); 
     mRenderer.setClickEnabled(true); 
     mRenderer.setSelectableBuffer(100); 
     mChartView.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      SeriesSelection seriesSelection = mChartView.getCurrentSeriesAndPoint(); 
      double[] xy = mChartView.toRealPoint(0); 
      if (seriesSelection == null) { 
      Toast.makeText(ChartBuilder.this, "No chart element was clicked", Toast.LENGTH_SHORT) 
       .show(); 
      } else { 
      Toast.makeText(
       ChartBuilder.this, 
       "Your blood glucose level at this point is = " + (float) xy[1] + "mg/dl, where the normal level of blood glucose is < 140 mg/dl, " + textResult, Toast.LENGTH_SHORT).show(); 
      } 
     } 
     }); 
     mChartView.setOnLongClickListener(new View.OnLongClickListener() { 
     @Override 
     public boolean onLongClick(View v) { 
      SeriesSelection seriesSelection = mChartView.getCurrentSeriesAndPoint(); 
      if (seriesSelection == null) { 
      Toast.makeText(ChartBuilder.this, "No chart element was long pressed", 
       Toast.LENGTH_SHORT); 
      return false; // no chart element was long pressed, so let something 
      // else handle the event 
      } else { 
      Toast.makeText(ChartBuilder.this, "Chart element in series index " 
       + seriesSelection.getSeriesIndex() + " data point index " 
       + seriesSelection.getPointIndex() + " was long pressed", Toast.LENGTH_SHORT); 
      return true; // the element was long pressed - the event has been 
      // handled 
      } 
     } 
     }); 
     mChartView.addZoomListener(new ZoomListener() { 
     public void zoomApplied(ZoomEvent e) { 
      String type = "out"; 
      if (e.isZoomIn()) { 
      type = "in"; 
      } 
      System.out.println("Zoom " + type + " rate " + e.getZoomRate()); 
     } 

     public void zoomReset() { 
      System.out.println("Reset"); 
     } 
     }, true, true); 
     mChartView.addPanListener(new PanListener() { 
     public void panApplied() { 
      System.out.println("New X range=[" + mRenderer.getXAxisMin() + ", " + mRenderer.getXAxisMax() 
       + "], Y range=[" + mRenderer.getYAxisMax() + ", " + mRenderer.getYAxisMax() + "]"); 
     } 
     }); 
     layout.addView(mChartView, new LayoutParams(LayoutParams.FILL_PARENT, 
      LayoutParams.FILL_PARENT)); 
    } else { 
     mChartView.repaint(); 
    } 
    } 



    public void cek(){ 

     String url_select = "http://10.0.2.2/BloodGlucose/selectUserChart.php"; 

     HttpClient httpClient = new DefaultHttpClient(); 
     HttpPost httpPost = new HttpPost(url_select); 

     //parameter 
     String username = getIntent().getStringExtra("uname"); 
     ArrayList<NameValuePair> param = new ArrayList<NameValuePair>(); 
     param.add(new BasicNameValuePair("username", username)); 
     try { 
     //add parameter 
      httpPost.setEntity(new UrlEncodedFormEntity(param)); 

     HttpResponse httpRespose = httpClient.execute(httpPost); 
     HttpEntity httpEntity = httpRespose.getEntity(); 

     //read content 
     InputStream in = httpEntity.getContent(); 
     BufferedReader read = new BufferedReader(new InputStreamReader(in)); 

     String content = ""; 
     String line = ""; 

     while((line = read.readLine())!=null){ 
      content += line; 
     } 

     Log.d("ADBUG", "content: "+content); 


     //json 
     if(!content.equals("null")){ 

      try { 
       JSONArray jArr = new JSONArray(content); 
       for(int i=0;i<jArr.length();i++){ 
       JSONObject jObj = jArr.getJSONObject(i); 

       String a = jObj.getString("_id"); 
       String b = jObj.getString("result"); 


       ids.add(a.toString()); 
       result.add(b.toString()); 


       Double x,y; 

         x = Double.parseDouble(a.toString()); 
         y = Double.parseDouble(b.toString()); 
         mCurrentSeries.add(x, y); 


       } 

      } catch (JSONException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } 

     }else{ 
      Toast.makeText(this, "Error", Toast.LENGTH_LONG).show(); 
     } 

    } catch (ClientProtocolException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
    } catch (IOException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
    } 
    } 

} 

的問題是，圖表是空的，任何人都可以幫助我？

my databases 
_id | result| 
1 | 180 | 
2 | 200 | 
3 | 145 | 

這是我的PHP代碼：selectUserChart.php

<?php 
    include_once("koneksi.php"); 

    $username = $_REQUEST['username']; 

    $sqlString = "SELECT * FROM login WHERE username_user = '$username'"; 

    $rs = mysql_query($sqlString); 

    if($rs){ 
     while($objRs = mysql_fetch_assoc($rs)){ 
     $output[] = $objRs; 
     } 

     echo json_encode($output); 
    } 
    mysql_close(); 
?> 

Answer 1

我在這段代碼中看到了相關的返回數據Web Service的唯一問題。我評論說，因爲我無法訪問它並添加硬編碼數據，並且圖表顯示正常。

要親自看看，請添加下面的方法並調用它，而不是調用cek()。

private void addData() { 
    mCurrentSeries.add(0, 1); 
    mCurrentSeries.add(1, 2); 
    mCurrentSeries.add(2, 1); 
    mCurrentSeries.add(3, 2); 
}