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POProblems with sensors causing FCs
 

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  1. POProblems with sensors causing FCs
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    <p>I'm having a bit of a problem with my first app on Android. I've been searching and all about how to use sensors events but I'm having FC's every time I'm opening my app.</p> <p>logcat says :</p> <pre><code>02-26 05:45:55.291 I/ActivityManager(4935): Displayed me.das4ilor.fortunetellerfull/.MainActivity: +1s311ms 02-26 05:45:55.385 W/NetworkManagementSocketTagger(4935): setKernelCountSet(10056, 0) failed with errno -2 02-26 05:45:55.494 D/AndroidRuntime(19501): Shutting down VM 02-26 05:45:55.494 W/dalvikvm(19501): threadid=1: thread exiting with uncaught exception (group=0x40a031f8) 02-26 05:45:55.533 E/AndroidRuntime(19501): FATAL EXCEPTION: main 02-26 05:45:55.533 E/AndroidRuntime(19501): java.lang.NullPointerException 02-26 05:45:55.533 E/AndroidRuntime(19501): at me.das4ilor.fortunetellerfull.MainActivity$1.onAccuracyChanged(MainActivity.java:58) 02-26 05:45:55.533 E/AndroidRuntime(19501): at android.hardware.SensorManager$ListenerDelegate$1.handleMessage(SensorManager.java:574) 02-26 05:45:55.533 E/AndroidRuntime(19501): at android.os.Handler.dispatchMessage(Handler.java:99) 02-26 05:45:55.533 E/AndroidRuntime(19501): at android.os.Looper.loop(Looper.java:137) 02-26 05:45:55.533 E/AndroidRuntime(19501): at android.app.ActivityThread.main(ActivityThread.java:4575) 02-26 05:45:55.533 E/AndroidRuntime(19501): at java.lang.reflect.Method.invokeNative(Native Method) 02-26 05:45:55.533 E/AndroidRuntime(19501): at java.lang.reflect.Method.invoke(Method.java:511) 02-26 05:45:55.533 E/AndroidRuntime(19501): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789) 02-26 05:45:55.533 E/AndroidRuntime(19501): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:556) 02-26 05:45:55.533 E/AndroidRuntime(19501): at dalvik.system.NativeStart.main(Native Method) 02-26 05:45:55.533 W/ActivityManager(4935): Force finishing activity me.das4ilor.fortunetellerfull/.MainActivity </code></pre> <p>Here's the .java :</p> <pre><code>package me.das4ilor.fortunetellerfull; import me.das4ilor.fortunetellerfull.R; import android.hardware.Sensor; import android.hardware.SensorEvent; import android.hardware.SensorEventListener; import android.hardware.SensorManager; import android.os.Bundle; import android.app.Activity; import android.content.Context; import android.widget.TextView; import android.widget.Toast; import java.util.Random; public class MainActivity extends Activity { public static final Random rgenerator = new Random(); private SensorManager mSensorManager; private float mAccel; private float mAccelCurrent; private float mAccelLast; private TextView textView2; private String[] myString; Context context = this; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Toast.makeText(context, "Thank you for buying full version!", Toast.LENGTH_SHORT).show(); mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE); mSensorManager.registerListener(mSensorListener, mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_NORMAL); mAccel = 0.00f; mAccelCurrent = SensorManager.GRAVITY_EARTH; mAccelLast = SensorManager.GRAVITY_EARTH; } private final SensorEventListener mSensorListener = new SensorEventListener() { public void onSensorChanged(SensorEvent se) { float x = se.values[0]; float y = se.values[1]; float z = se.values[2]; mAccelLast = mAccelCurrent; mAccelCurrent = (float) Math.sqrt((double) (x*x + y*y + z*z)); float delta = mAccelCurrent - mAccelLast; mAccel = mAccel * 0.9f + delta; } public void onAccuracyChanged(Sensor sensor, int accuracy) { myString = getResources().getStringArray(R.array.String); String q = myString[rgenerator.nextInt(myString.length)]; textView2.setText(q); } }; @Override protected void onResume() { super.onResume(); mSensorManager.registerListener(mSensorListener, mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_NORMAL); } @Override protected void onPause() { mSensorManager.unregisterListener(mSensorListener); super.onPause(); } } </code></pre>
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