Question

below is logcat result which shows out of memory problem.

it may be involved with too big byte[] array.

---

04-17 22:21:38.773: W/dalvikvm(4963): threadid=1: thread exiting with uncaught exception (group=0x40a4d1f8)
04-17 22:21:38.781: E/AndroidRuntime(4963): FATAL EXCEPTION: main
04-17 22:21:38.781: E/AndroidRuntime(4963): java.lang.OutOfMemoryError
04-17 22:21:38.781: E/AndroidRuntime(4963): at java.nio.CharBuffer.put(CharBuffer.java:509)
04-17 22:21:38.781: E/AndroidRuntime(4963): at java.nio.charset.CharsetDecoder.allocateMore(CharsetDecoder.java:238)
04-17 22:21:38.781: E/AndroidRuntime(4963): at java.nio.charset.CharsetDecoder.decode(CharsetDecoder.java:195)
04-17 22:21:38.781: E/AndroidRuntime(4963): at java.nio.charset.Charset.decode(Charset.java:487)
04-17 22:21:38.781: E/AndroidRuntime(4963): at java.lang.String.(String.java:174)
04-17 22:21:38.781: E/AndroidRuntime(4963): at java.lang.String.(String.java:141)

04-17 22:21:38.781: E/AndroidRuntime(4963): at exam.militarymgrs.Draw_LOS.readFile(Draw_LOS.java:182)

Draw_LOS.java:182 is as follows.
(String s = new String(dat);)

——-Source code————–

public static ArrayList<String> readFile(String fileName) {
//map data access
String sdPath;
sdPath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/";

File file = new File(sdPath+fileName);
//String[] k = new String[1440000];
//String line = "";

ArrayList<String> data = new ArrayList<String>();//consider using ArrayList<int>
try {
FileInputStream fis = new FileInputStream(file);
byte[] dat = new byte[fis.available()];
String s = new String(dat);
String[] k = s.split("[\\r\\n]+");
while(fis.read(dat) != -1) {;}
fis.close();

}
catch(FileNotFoundException fN) {
fN.printStackTrace();
}
catch(IOException e) {
System.out.println(e);
}
return data; 
}

---

A file which should be loaded is as follows

12
32
43
…

How can I read the data file without Out of Memory with fileStream??

Answer 1

try to use this:

public static String toBinaryString(byte n) {
StringBuilder sb = new StringBuilder("00000000");
for (int bit = 0; bit < 8; bit++) {
if (((n >> bit) & 1) > 0) {
sb.setCharAt(7 - bit, '1');
}
}
return sb.toString();
}