幫助數組在android中

我得到NullPointerException在開始我在哪裏出錯了？幫助數組在android中

public void checkzone(Location loc) 
    { 

     X = new List<float[]>() { 


    }; 
    Y = new List<float[]>() { 
    }; 
     X.clear(); 
     Y.clear(); 

     float x = (float) loc.getLatitude(); 
     float y = (float) loc.getLongitude(); 
    float A1X[] = {(float) 41.992853, (float) 41.994815, (float) 41.995158, (float) 41.993065};//DOMA 
    float A3X[] = {(float) 41.994594, (float) 41.994595, (float) 41.993744, (float) 41.993747};//OVIE SE TOCNI 
    float A4X[] = {(float) 41.121212, (float) 41.121212, (float) 41.121212, (float) 41.121212}; 
    float A5X[] = {(float) 41.121212, (float) 41.121212, (float) 41.121212, (float) 41.121212}; 
    float A6X[] = {(float) 41.121212, (float) 41.121212, (float) 41.121212, (float) 41.121212}; 
    float B2X[] = {(float) 41.121212, (float) 41.121212, (float) 41.121212, (float) 41.121212}; 
    float C11X[] ={(float) 41.121212, (float) 41.121212, (float) 41.121212, (float) 41.121212}; 
    float C15X[] = {(float) 41.121212, (float) 41.121212, (float) 41.121212, (float) 41.121212}; 
    float C17X[] = {(float) 41.121212, (float) 41.121212, (float) 41.121212, (float) 41.121212}; 


    float A1Y[] = {(float) 21.411527, (float) 21.411505, (float) 21.4142847, (float) 21.415116};//Doma 
    float A3Y[] = {(float) 21.427817, (float) 21.428015, (float) 21.427972, (float) 21.427763};//OVIE SE TOCNI 
    float A4Y[] = {(float) 21.122112, (float) 21.122112, (float) 21.122112, (float) 21.122112}; 
    float A5Y[] = {(float) 21.122112, (float) 21.122112, (float) 21.122112, (float) 21.122112}; 
    float A6Y[] = {(float) 21.122112, (float) 21.122112, (float) 21.122112, (float) 21.122112};  
    float B2Y[] = {(float) 21.122112, (float) 21.122112, (float) 21.122112, (float) 21.122112}; 
    float C11Y[] = {(float) 21.122112, (float) 21.122112, (float) 21.122112, (float) 21.122112}; 
    float C15Y[] = {(float) 21.122112, (float) 21.122112, (float) 21.122112, (float) 21.122112}; 
    float C17Y[] = {(float) 21.122112, (float) 21.122112, (float) 21.122112, (float) 21.122112}; 


    X.add(A1X); 
    X.add(A3X); 
    X.add(A4X); 
    X.add(A5X); 
    X.add(A6X);  
    X.add(B2X); 
    X.add(C11X); 
    X.add(C15X); 
    X.add(C17X); 
    X.add(A1X); 

    Y.add(A1Y); 
    Y.add(A3Y); 
    Y.add(A4Y); 
    Y.add(A5Y); 
    Y.add(A6Y); 
    Y.add(B2Y); 
    Y.add(C11Y); 
    Y.add(C15Y); 
    Y.add(C17Y); 
    Y.add(A1Y); 

     for(int i=0; i<=X.size();i++) 
     { 


      if (pointInPolygon(X.get(i).length,X.get(i),Y.get(i),x,y)) 
      { 

       switch (i) { 
       case 1: 
        zonefoundsettexts("A1"); 
       case 2: 
        zonefoundsettexts("A3");  
       case 3: 
        zonefoundsettexts("A4");  
       case 4: 
        zonefoundsettexts("A5");  
       case 5: 
        zonefoundsettexts("A6");  
       case 6: 
        zonefoundsettexts("B2"); 
       case 7: 
        zonefoundsettexts("C11"); 
       case 8: 
        zonefoundsettexts("C15"); 
       case 9: 
        zonefoundsettexts("C17"); 


          } 
      } 
//   else 
     //     zonefoundsettexts("nozone"); 

     } 




    };

來源

2010-07-28 Simon

BAD：

for(int i=0; i<=X.size();i++)

GOOD：

for(int i = 0, n = X.size(); i < n; i++)

BAD：

  case 1: 
       zonefoundsettexts("A1"); 
      case 2: 
       zonefoundsettexts("A3");

GOOD：

  case 1: 
       zonefoundsettexts("A1"); 
       break; 
      case 2: 
       zonefoundsettexts("A3");  
       break;

你也不必clear()列出了創建它們

來源

2010-07-28 15:44:16

清算和<=被投入來試圖解決這個問題，但你有斷點。謝謝 – Simon 2010-07-28 17:33:36

Java沒有，既沒有原始類型，也不陣列支持泛型之後。你需要一個使用List的List一個S的Float S（未float）：List<List<Float>>

來源

2010-07-28 15:47:14 RoToRa

幫助數組在android中

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