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PORetrieving Array from onActivityResult
 

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  1. PORetrieving Array from onActivityResult
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    <p>I am using FFT on an Android project and need for the audioRecord to write to the buffer for only 3 seconds. Since, I do not need any updating during the capture I am not using AsyncTask.</p> <p>When I go to start the processing I get errors for the toTransform length and expression type. What am I missing to make these parts work or did I go about this the wrong way?</p> <p>P.S. This all works as an Asynctask.</p> <pre><code>package com.example.learnfft; import java.io.BufferedWriter; import java.io.File; import java.io.FileWriter; import java.io.IOException; import java.util.Calendar; import java.util.Timer; import java.util.TimerTask; import android.app.Activity; import android.content.Intent; import android.media.AudioFormat; import android.media.AudioRecord; import android.media.MediaRecorder; import android.os.Bundle; import android.os.Handler; import android.util.Log; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; //import android.widget.Toast; import ca.uol.aig.fftpack.RealDoubleFFT; public class Main extends Activity implements OnClickListener { public int channelConfiguration = AudioFormat.CHANNEL_IN_MONO; public int audioEncoding = AudioFormat.ENCODING_PCM_16BIT; //FFT private RealDoubleFFT transformer; int blockSize = 1024; Button startStopButton; int frequency = 44100; int requestcode; boolean started = false; double freq; double[] magnitude; short[] buffer = new short[blockSize]; double[] toTransform = new double[blockSize]; //Create thread Handler Handler handler = new Handler(); int bufferSize = AudioRecord.getMinBufferSize(frequency, channelConfiguration, audioEncoding); Timer timer = new Timer(); AudioRecord audioRecord = new AudioRecord( MediaRecorder.AudioSource.MIC, frequency, channelConfiguration, audioEncoding, bufferSize); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Button button = (Button) findViewById(R.id.takeTemp); button.setOnClickListener(this); } @Override public void onClick(View v) { Intent i = new Intent(this,recordAudio.class); startActivityForResult(i,requestcode); //recordAudio(toTransform); FindFrequency(); } public void FindFrequency() { try { audioRecord.startRecording(); int bufferReadResult = audioRecord.read(buffer, 0, blockSize); for (int i = 0; i &lt; blockSize &amp;&amp; i &lt; bufferReadResult; i++) { toTransform[i] = (double) buffer[i] / 32768.0; // signed // 16 // bit } timer.schedule(new TimerTask() { public void run() { handler.post(new Runnable() { public void run() { audioRecord.stop(); } }); } }, 3000); //Stop after 3 seconds } catch (Throwable t) { Log.e("AudioRecord", "Recording Failed"); } File freqFile = new File("/mnt/sdcard/Test APKs/frequency.file"); File magFile = new File("/mnt/sdcard/Test APKs/magnitude.file"); int blockSize = 256; double[] audioDataDoubles = new double[(blockSize*2)]; String mydate = java.text.DateFormat.getDateTimeInstance().format(Calendar.getInstance().getTime()); transformer.ft(toTransform); for ( int x = 0; x &lt; toTransform[0].length; x++) { &lt;-- Length error audioDataDoubles[2*x] = toTransform[0][x]; &lt;-- is array but it must resolve to double. audioDataDoubles[(2*x)+1] = 0.0; } double[] re = new double[blockSize]; double[] im = new double[blockSize]; double[] magnitude = new double[blockSize]; // Calculate the Real and imaginary and Magnitude. for(int i = 0; i &lt; blockSize; i++){ // real is stored in first part of array re[i] = audioDataDoubles[i*2]; // imaginary is stored in the sequential part im[i] = audioDataDoubles[(2*i)+1]; // magnitude is calculated by the square root of (imaginary^2 + real^2) magnitude[i] = Math.sqrt((re[i] * re[i]) + (im[i]*im[i])); } double peak = -1.0; // Get the largest magnitude peak for(int i = 0; i &lt; blockSize; i++){ if(peak &lt; magnitude[i]) peak = magnitude[i]; String magValue = String.valueOf(peak); try { BufferedWriter buf = new BufferedWriter(new FileWriter(magFile, true)); buf.append(mydate + " - " + magValue); buf.newLine(); buf.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } // calculated the frequency freq = (frequency * peak)/blockSize; String freqValue = String.valueOf(freq); //Toast.makeText(Main.this, freqValue, Toast.LENGTH_SHORT).show(); try { BufferedWriter buf = new BufferedWriter(new FileWriter(freqFile, true)); buf.append(mydate + " - " + freqValue); buf.newLine(); buf.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } </code></pre>
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    1. US123troy
    1. US123troy
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    1. COchange `toTransform[0].length` to `toTransform.length` and what is `toTransform`? a 2d array?
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      1. PORetrieving Array from onActivityResult
      1. USRaghunandan
    2. COI don't know exactly but can you try to write super.onActivityResult(requestCode, resultCode, data); after FindFrequency(toTransform);
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      1. PORetrieving Array from onActivityResult
      1. USBharat Sharma
    3. COCan you check once whether toTransform is double[] at both places.
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      1. PORetrieving Array from onActivityResult
      1. USBharat Sharma
 

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