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POAndroid - Null Pointer Exception
 

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    <p>i'm stuck on a problem trying to call a method from another class (when ever I call a method from this class I get a crash with NullPointerException except from when it's a static function. I currently call render.Update() and get a logcat output of -> <a href="http://pastebin.com/njjxDiQZ" rel="nofollow">http://pastebin.com/njjxDiQZ</a></p> <pre><code>11-26 17:14:40.532: E/MediaPlayer(29755): Should have subtitle controller already set 11-26 17:14:40.752: E/AndroidRuntime(29755): FATAL EXCEPTION: main 11-26 17:14:40.752: E/AndroidRuntime(29755): Process: com.coursework.courseworkapp, PID: 29755 11-26 17:14:40.752: E/AndroidRuntime(29755): java.lang.NullPointerException 11-26 17:14:40.752: E/AndroidRuntime(29755): at com.coursework.courseworkapp.Visual.updateVisualizer(Visual.java:73) 11-26 17:14:40.752: E/AndroidRuntime(29755): at com.coursework.courseworkapp.Visual$1.onWaveFormDataCapture(Visual.java:48) 11-26 17:14:40.752: E/AndroidRuntime(29755): at android.media.audiofx.Visualizer$NativeEventHandler.handleCaptureMessage(Visualizer.java:669) 11-26 17:14:40.752: E/AndroidRuntime(29755): at android.media.audiofx.Visualizer$NativeEventHandler.handleMessage(Visualizer.java:700) 11-26 17:14:40.752: E/AndroidRuntime(29755): at android.os.Handler.dispatchMessage(Handler.java:102) 11-26 17:14:40.752: E/AndroidRuntime(29755): at android.os.Looper.loop(Looper.java:137) 11-26 17:14:40.752: E/AndroidRuntime(29755): at android.app.ActivityThread.main(ActivityThread.java:4998) 11-26 17:14:40.752: E/AndroidRuntime(29755): at java.lang.reflect.Method.invokeNative(Native Method) 11-26 17:14:40.752: E/AndroidRuntime(29755): at java.lang.reflect.Method.invoke(Method.java:515) 11-26 17:14:40.752: E/AndroidRuntime(29755): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777) 11-26 17:14:40.752: E/AndroidRuntime(29755): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:593) 11-26 17:14:40.752: E/AndroidRuntime(29755): at dalvik.system.NativeStart.main(Native Method) </code></pre> <p>Any help would be appreciated i'm really stumped here.</p> <h1>First Class</h1> <pre><code>package com.coursework.courseworkapp; import java.util.Set; import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.Matrix; import android.graphics.Paint; import android.graphics.Rect; import android.graphics.Bitmap.Config; import android.media.MediaPlayer; import android.media.audiofx.Visualizer; import android.util.Log; import android.view.View; import android.widget.LinearLayout; public class Visual{ byte[] fft; byte[] mFFTBytes; byte[] mBytes; private Visualizer mVisualizer; Render render; private Rect mRect = new Rect(); private Paint mFlashPaint = new Paint(); private Paint mFadePaint = new Paint(); Bitmap mCanvasBitmap; Canvas mCanvas; public int Test(MediaPlayer player){ mVisualizer = new Visualizer(player.getAudioSessionId()); mVisualizer.setCaptureSize(Visualizer.getCaptureSizeRange()[1]); Visualizer.OnDataCaptureListener captureListener = new Visualizer.OnDataCaptureListener() { @Override public void onWaveFormDataCapture(Visualizer visualizer, byte[] bytes, int samplingRate) { updateVisualizer(bytes); } @Override public void onFftDataCapture(Visualizer visualizer, byte[] bytes, int samplingRate) { updateVisualizerFFT(bytes); } }; mVisualizer.setDataCaptureListener(captureListener, Visualizer.getMaxCaptureRate() / 2, true, true); mVisualizer.setEnabled(true); return player.getAudioSessionId(); } public void updateVisualizer(byte[] bytes) { mBytes = bytes; } public void updateVisualizerFFT(byte[] bytes) { mFFTBytes = bytes; render.Update(); //render.invalidate() } public byte[] getFFT(){ return mFFTBytes; } } </code></pre> <h1>The Render Class</h1> <pre><code>package com.coursework.courseworkapp; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.media.audiofx.Visualizer; import android.util.Log; import android.view.View; import android.widget.Toast; public class Render extends View { public Render(Context context) { super(context); setMinimumWidth(800); setMinimumHeight(1000); setFocusable(true); } public void Update(){ //Will have code here after fix crash. } protected void onDraw(Canvas canvas){ canvas.drawColor(Color.RED); //Will add more code here. } } </code></pre> <h1>MainActivity.Java - How I start Visualise.java</h1> <pre><code>public class MainActivity extends Activity { private MediaPlayer mPlayer; Visual visualize = new Visual(); Render render; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); render = new Render(this); ((LinearLayout) findViewById(R.id.root)).addView(render, 0); //Log.d("Freq", "test"); mPlayer = MediaPlayer.create(this, R.raw.test2); mPlayer.setLooping(true); mPlayer.start(); //Log.d("Freq", "test"); Handler handler = new Handler(); Runnable runnable = new Runnable(){ @Override public void run() { // TODO Auto-generated method stub int i = visualize.Test(mPlayer); //render.invalidate(); } }; handler.postDelayed(runnable, 100); /*byte[] fft = visualize.getFFT(); if(fft != null){ Toast.makeText(this,"yey",Toast.LENGTH_LONG).show(); } else{ Toast.makeText(this,"nope",Toast.LENGTH_LONG).show(); }*/ /* THis part didn't work, Why? Check the other example */ //Log.w("Freq", String.valueOf(fft.length)); /*for(int i = 0; i &lt; fft.length; i++){ String s = new String(); Log.w("Freq", String.valueOf(fft[i])); }*/ } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } public void tryDraw(){ //render.Update(); } </code></pre> <p>}</p>
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    1. COpost the logcat here.
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