如何在Android類中初始化變量？

Question

初始化LOC或LAT變量時出現問題，應用崩潰，問題出在哪里？

public final class MyLocationListener  implements LocationListener {

Context c;
Camera mycam =Camera.open(1);
Float[] LOC;
Float[] LAT;


public MyLocationListener(Context context) {
     c= context;

     // read all file & spiting them

     String DataPoints = read_db("gpspoints");
     DataPoints.trim();
     String []ar=DataPoints.split("&");

     String[] twovar=ar[2].split("/");
     this.LOC[1]=(float) 1;
     this.LAT[1]=(float) 1;

     //end of read and Split
}

Answer 1

放

this.LAT = new Float[2];
this.LOC = new Float[2];

之前

this.LOC[1]= (float) 1;
this.LAT[1]= (float) 1;

問題是您想在數組中設置一個值，但尚未初始化數組。

Answer 2

嘗試這個：

this.LOC[0]=(float) 1;
this.LAT[0]=(float) 1;