"cannot find symbol" error w/ AudioTrack

Question

Considering I've never written a line of Java before today, I'm sure I've missed something obvious. In any case, I'm working on an Android app that uses the AudioTrack class to play generated audio.

I'm importing everything I think I'm supposed to:

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.CheckBox;
import android.media.AudioFormat;
import android.media.AudioManager;
import android.media.AudioTrack;

Within my Activity class I have this function:

public AudioTrack toneToAudioTrack(byte samples[], int numSamples) {
    final AudioTrack audioTrack = new AudioTrack(
        AudioManager.STREAM_MUSIC,
        sampleRate,
        AudioFormat.CHANNEL_CONFIGURATION_MONO,
        AudioFormat.ENCODING_PCM_8BIT,
        numSamples,
        AudioTrack.MODE_STATIC
    );

    audioTrack.write(samples, 0, numSamples);

    return audioTrack;
}

When I try to compile with ant, I get this:

compile:
[javac] /opt/android-sdk-update-manager/tools/ant/main_rules.xml:384: warning: 'includeantruntime' was not
set, defaulting to
build.sysclasspath=last; set to false
for repeatable builds
[javac] Compiling 2 source files to /home/electrode/ditdah/bin/classes
[javac] /home/electrode/ditdah/src/org/n8fq/DitDah/DitDahActivity.java:38:
cannot find symbol
[javac] symbol : constructor AudioTrack(int,double,int,int,int,int)
[javac] location: class android.media.AudioTrack
[javac] audioTrack = new AudioTrack(
[javac] ^
[javac] 1 error

BUILD FAILED
/opt/android-sdk-update-manager/tools/ant/main_rules.xml:384: Compile failed; see the compiler error
output for details.

So, what am I missing?

objects objects · Accepted Answer · 2011-03-19T06:49:41

The 2nd argument to the constructor should be an int

final AudioTrack audioTrack = new AudioTrack(
    AudioManager.STREAM_MUSIC,
    (int) sampleRate,
    AudioFormat.CHANNEL_CONFIGURATION_MONO,
    AudioFormat.ENCODING_PCM_8BIT,
    numSamples,
    AudioTrack.MODE_STATIC
);

"cannot find symbol" error w/ AudioTrack

1 Answers