How to Create a string from a BufferedInputStream using bytes?

Question

I am trying to read a text file and create a string. I am using following code:

 String FILENAME = "file.txt";
 File file = getApplicationContext().getFileStreamPath(FILENAME);

 int size = (int) file.length();
 System.out.println("size: "+size);
 byte[] bytes = new byte[size];

 BufferedInputStream buf = new BufferedInputStream(new FileInputStream(file));
 buf.read(bytes, 0, bytes.length);
 buf.close();

 System.out.println("buf string: "+new String(bytes));

size in this case is 5295164. in the last line of code, i get following exception:

 FATAL EXCEPTION: main
 java.lang.OutOfMemoryError
     at java.lang.AbstractStringBuilder.enlargeBuffer(AbstractStringBuilder.java:94)
     at java.lang.AbstractStringBuilder.append0(AbstractStringBuilder.java:145)
     at java.lang.StringBuilder.append(StringBuilder.java:216)
     at se.egretails.ssapp.MyActivity$4.onClick(MyActivity.java:461)
     at android.view.View.performClick(View.java:4084)
     at android.view.View$PerformClick.run(View.java:16966)
     at android.os.Handler.handleCallback(Handler.java:615)
     at android.os.Handler.dispatchMessage(Handler.java:92)
     at android.os.Looper.loop(Looper.java:137)
     at android.app.ActivityThread.main(ActivityThread.java:4812)
     at java.lang.reflect.Method.invokeNative(Native Method)
     at java.lang.reflect.Method.invoke(Method.java:511)
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
     at dalvik.system.NativeStart.main(Native Method)

How should i solve this? Thanks in advance.

Answer 1

The buffer is too large. Try this:

    InputStream content = new FileInputStream(file);

    int numRead;
    final int bufferSize = 1024;
    byte[] buffer = new byte[bufferSize];
    ByteArrayOutputStream outString = new ByteArrayOutputStream();
    try{
        while ((numRead = content.read(buffer)) != -1) {
            outString.write(buffer, 0, numRead);
        }
    } finally {
        content.close();
    }
    return new String(outString.toByteArray());