Android read text raw resource file

You can use this:

    try {
        Resources res = getResources();
        InputStream in_s = res.openRawResource(R.raw.help);

        byte[] b = new byte[in_s.available()];
        in_s.read(b);
        txtHelp.setText(new String(b));
    } catch (Exception e) {
        // e.printStackTrace();
        txtHelp.setText("Error: can't show help.");
    }

What if you use a character-based BufferedReader instead of byte-based InputStream?

BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
String line = reader.readLine();
while (line != null) { 
    ...
    line = reader.readLine();
}

Don't forget that readLine() skips the new-lines!

If you use IOUtils from apache "commons-io" it's even easier:

InputStream is = getResources().openRawResource(R.raw.yourNewTextFile);
String s = IOUtils.toString(is);
IOUtils.closeQuietly(is); // don't forget to close your streams

Dependencies: http://mvnrepository.com/artifact/commons-io/commons-io

Maven:

<dependency>
    <groupId>commons-io</groupId>
    <artifactId>commons-io</artifactId>
    <version>2.4</version>
</dependency>

Gradle:

'commons-io:commons-io:2.4'

Well with Kotlin u can do it just in one line of code:

resources.openRawResource(R.raw.rawtextsample).bufferedReader().use { it.readText() }

Or even declare extension function:

fun Resources.getRawTextFile(@RawRes id: Int) =
        openRawResource(id).bufferedReader().use { it.readText() }

And then just use it straightaway:

val txtFile = resources.getRawTextFile(R.raw.rawtextsample)

Rather do it this way:

// reads resources regardless of their size
public byte[] getResource(int id, Context context) throws IOException {
    Resources resources = context.getResources();
    InputStream is = resources.openRawResource(id);

    ByteArrayOutputStream bout = new ByteArrayOutputStream();

    byte[] readBuffer = new byte[4 * 1024];

    try {
        int read;
        do {
            read = is.read(readBuffer, 0, readBuffer.length);
            if(read == -1) {
                break;
            }
            bout.write(readBuffer, 0, read);
        } while(true);

        return bout.toByteArray();
    } finally {
        is.close();
    }
}

    // reads a string resource
public String getStringResource(int id, Charset encoding) throws IOException {
    return new String(getResource(id, getContext()), encoding);
}

    // reads an UTF-8 string resource
public String getStringResource(int id) throws IOException {
    return new String(getResource(id, getContext()), Charset.forName("UTF-8"));
}

From an Activity, add

public byte[] getResource(int id) throws IOException {
        return getResource(id, this);
}

or from a test case, add

public byte[] getResource(int id) throws IOException {
        return getResource(id, getContext());
}

And watch your error handling - don't catch and ignore exceptions when your resources must exist or something is (very?) wrong.

Android read text raw resource file

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