내 Android PieChart 드로잉이 비정상적으로 작동하는 이유와 화면 회전시 복제 된 슬라이스가 표시되는 이유는 무엇입니까?

Question

이 문제를 해결하려면 도움이 필요합니다. 나는 MySQLdb에서 일부 데이터를 사용하여 내 안드로이드 응용 프로그램에 그려진 PieChart 있습니다. 클래스 구현을 사용하여 서버에서 데이터를로드하여 HTTPPostRequest으로 만들고 응답을 구문 분석하여 JSON을 반환합니다. 차트가 잘 나오고 화면에 그려집니다. 차트가 비정상적으로 동작하고 슬라이스가 다시 그려지는 이유는 무엇인지 모르겠지만 화면을 회전하면 Activity의 모든 메서드가 호출됩니다. 다시 (onCreate(), onStart() 및 onResume() 방법). 어쩌면 그게 그거야 ??? 데이터가 중복되는

: 나는 장치를 회전 할 때 다음

:하지만 여기처럼 보이게하는 방법입니다 ... 확실하지 않다! 왜? 나는 무엇을 착각하고 있는가? 여기

모든 코드 :

public class ComeHaInvestito extends Activity { 

/**** PieChartBuilder ****/ 
/** Colors to be used for the pie slices. */ 
private static int[] COLORS = new int[] { Color.GREEN, Color.BLUE, Color.MAGENTA, Color.CYAN }; 
/** The main series that will include all the data. */ 
private CategorySeries mSeries = new CategorySeries(""); 
/** The main renderer for the main dataset. */ 
private DefaultRenderer mRenderer = new DefaultRenderer(); 
/** Edit text field for entering the slice value. */ 
//private EditText mValue; 
/** The chart view that displays the data. */ 
private GraphicalView mChartView; 

private int HowmanyTimes; 
@Override 
protected void onRestoreInstanceState(Bundle savedState) { 
    super.onRestoreInstanceState(savedState); 
    mSeries = (CategorySeries) savedState.getSerializable("current_series"); 
    mRenderer = (DefaultRenderer) savedState.getSerializable("current_renderer"); 
} 

    @Override 
    protected void onSaveInstanceState(Bundle outState) { 
    super.onSaveInstanceState(outState); 
    outState.putSerializable("current_series", mSeries); 
    outState.putSerializable("current_renderer", mRenderer); 
    } 

/**** ComeHaInvestito ****/ 
// String which will store the values of the user 
String municipalityName; 
String year; 
String versedMoney; 

// List<Item> ArrayList that will be used to store data from DB 
List<Item> MasterAndDetailstatisticsInfoList; 

private static final String TAG_COMUNE = "mun_name"; 
private static final String TAG_ANNO = "year"; 
private static final String TAG_VERSED_MONEY = "versed_money"; 
private static final String TAG_SUCCESS = "success"; 

// POST request information 
private static final String URL_ANDROID_APP_LISTENER = "http://xxx.xxx.xxx.xxx/androidApp/AndroidListener.php"; 

private ProgressDialog pDialog; 
// JSONParser instance 
JSONParser jParser = new JSONParser(); 

// JSON data retrieving information 
private static final String JSON_STATISTICS_INFOS_LABEL = "statistics_infos"; 
private static final String JSON_MASTER_LABEL = "master"; 
private static final String JSON_DETAIL_LABEL = "detail"; 
private static final String JSON_MASTER_DETAIL_NAME_LABEL = "name"; 
private static final String JSON_MASTER_DETAIL_VALUE_LABEL ="value"; 

// statistics info JSON Array which will contain the Master and Detail data that will come from the POST request 
JSONArray statisticsInfo = null; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_come_ha_investito); 
    Log.d("OnCREATE", "CREO L'ACTIVITY"); 
    // recovering data from previous actitity 
    Intent iMieiDati = getIntent(); 
    this.municipalityName = iMieiDati.getStringExtra(TAG_COMUNE); 
    this.year = iMieiDati.getStringExtra(TAG_ANNO); 
    this.versedMoney = iMieiDati.getStringExtra(TAG_VERSED_MONEY); 

    // instantiating the needed data structure 
    MasterAndDetailstatisticsInfoList = new ArrayList<Item>(); 

    mRenderer.setStartAngle(270); 
    mRenderer.setDisplayValues(true); 

    new LoadAllMunicipalitiesInvestmentStatisticsThread().execute(); 

    //mRenderer.setZoomButtonsVisible(true); 

} 

@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    // Inflate the menu; this adds items to the action bar if it is present. 
    getMenuInflater().inflate(R.menu.pie_chart_builder2, menu); 
    return true; 
} 

@Override 
protected void onResume() { 
    super.onResume(); 

    if (mChartView == null) { 
     LinearLayout layout = (LinearLayout) findViewById(R.id.chart); 
     mChartView = ChartFactory.getPieChartView(this, mSeries, mRenderer); 
     mRenderer.setClickEnabled(true); 
     mChartView.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      SeriesSelection seriesSelection = mChartView.getCurrentSeriesAndPoint(); 
      if (seriesSelection == null) { 
      Toast.makeText(ComeHaInvestito.this, "No chart element selected", Toast.LENGTH_SHORT).show(); 
      } 
      else { 
      for (int i = 0; i < mSeries.getItemCount(); i++) { 
       mRenderer.getSeriesRendererAt(i).setHighlighted(i == seriesSelection.getPointIndex()); 
      } 
      // mChartView.repaint(); 

      Toast.makeText(
       ComeHaInvestito.this, 
       "Chart data point index " + seriesSelection.getPointIndex() + " selected" 
        + " point value=" + seriesSelection.getValue(), Toast.LENGTH_SHORT).show(); 

      } 
     } 
     }); 
     layout.addView(mChartView, new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT)); 
    } 
    else { 
     //mChartView.repaint(); 
    } 
    } 


    private void initChart() { 
     int i=0; 
     double value=0; 
     for (Item item : MasterAndDetailstatisticsInfoList) { 
      if (i == 4) { 
       break; 
      } 
      Log.d("Ciclo ", "NUMERO " + i); 
      if (item.getViewType() == EntryType.MASTER.ordinal()) { 
       MasterWithValue master = (MasterWithValue) item; 
       Log.d("MASTER NAME", master.getMasterName()); 
       Log.d("MASTER VALUE", master.getMasterValue()); 
       try { 
        value = Double.parseDouble(master.getMasterValue()); 
       } 
       catch (NumberFormatException e) { 
        // value is not a decimal 
       } 
       mSeries.add(master.getMasterName(), value); 
       SimpleSeriesRenderer renderer = new SimpleSeriesRenderer(); 
       renderer.setColor(COLORS[i%4]); 
       i++; 
       mRenderer.addSeriesRenderer(renderer); 
       Log.d("mSeries", mSeries.toString()); 
      } 
     } 
    } 

/**** Background Thread ****/ 
public class LoadAllMunicipalitiesInvestmentStatisticsThread extends AsyncTask<String, String, String> { 

    @Override 
    protected void onPreExecute() { 
     super.onPreExecute(); 
     pDialog = new ProgressDialog(ComeHaInvestito.this); 
     pDialog.setMessage("Caricamento..."); 
     pDialog.setIndeterminate(false); 
     pDialog.setCancelable(false); 
     pDialog.show();   
    } 

    @Override 
    protected String doInBackground(String... args) { 
     Log.d("ilMioComune", "Caricamento Statistiche Investimenti"); 
     // building the HTTP POST request 
     List<NameValuePair> params = new ArrayList<NameValuePair>(); 
     params.add(new BasicNameValuePair(TAG_COMUNE, municipalityName)); 
     params.add(new BasicNameValuePair(TAG_ANNO, year)); 
     params.add(new BasicNameValuePair(TAG_VERSED_MONEY, versedMoney)); 
     Log.d("params", params.toString()); 
     JSONObject json = jParser.makeHttpRequest(URL_ANDROID_APP_LISTENER, "POST", params); 

     Log.d("JSON POST statistics investments", json.toString()); 
     try { 
      int success = json.getInt(TAG_SUCCESS); 

      if (success == 1) { 

       statisticsInfo = json.getJSONArray(JSON_STATISTICS_INFOS_LABEL); 

       // foreach Statistics Master Entry 
       for (int i = 0; i<statisticsInfo.length(); i++) { 
        JSONObject JSONstatisticsInfo = statisticsInfo.getJSONObject(i); 
        JSONObject JSONmasterEntry = JSONstatisticsInfo.getJSONObject(JSON_MASTER_LABEL); 

        String masterEntryName = JSONmasterEntry.getString(JSON_MASTER_DETAIL_NAME_LABEL); 
        String masterEntryValue = JSONmasterEntry.getString(JSON_MASTER_DETAIL_VALUE_LABEL); 
        MasterAndDetailstatisticsInfoList.add(new MasterWithValue(masterEntryName, masterEntryValue));      

        JSONArray JSONdetails = JSONmasterEntry.getJSONArray(JSON_DETAIL_LABEL); 
        for (int j = 0; j<JSONdetails.length(); j++) { 
         JSONObject JSONdetailEntry = JSONdetails.getJSONObject(j); 

         String detailEntryName = JSONdetailEntry.getString(JSON_MASTER_DETAIL_NAME_LABEL); 
         String detailEntryValue = JSONdetailEntry.getString(JSON_MASTER_DETAIL_VALUE_LABEL); 

         MasterAndDetailstatisticsInfoList.add(new Detail(detailEntryName, detailEntryValue)); 
        } 
       } 
      } 
      else { 
       // no statistics infos associated to the selected municipality were found 
      } 
     } 
     catch (JSONException e) { 
      e.printStackTrace(); 
     } 

     return null; 
    } 

    @Override 
    protected void onPostExecute(String file_url) { 
     pDialog.dismiss(); 

     runOnUiThread(new Runnable() { 

      @Override 
      public void run() { 
       String MasterAndDetails = MasterAndDetailstatisticsInfoList.toString(); 
       Log.d("List", MasterAndDetails); 

       // Creating the pie chart using the data recovered from the DB 
       initChart(); 
      } 
     }); 
    } 
} 
} 

사람이이 문제를 해결하는 방법에 대한 어떤 생각을 가지고 있습니까?

관심을 가져 주셔서 감사합니다. 도움이되기를 바랍니다!

Answer 1

회전 할 때마다 onCreate(), onResume() 등이 올바르게 호출됩니다. 이 때문에 new LoadAllMunicipalitiesInvestmentStatisticsThread().execute();을 두 번 호출해야합니다.

데이터 초기화 논리를 한 곳으로 이동하고 savedInstanceState에서 해당 데이터를로드하거나 savedInstanceState가 null을 반환하면 초기화 논리를 호출해야합니다.

예를 들어

:

변화 선언 내에서 onCreate() 메소드에서 그 라인을 추가 한 onCreate()

if(savedInstanceState != null) 
    mSeries = (CategorySeries) savedInstanceState.getSerializable("current_series"); 

if(mSeries == null) 
{ 
    mSeries = new CategorySeries(""); 
    new LoadAllMunicipalitiesInvestmentStatisticsThread().execute(); //this line can be substituted for a new init method, which would contain the thread.execute 
}