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POAuto switching torch dependends on illuminance
 

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    <p>I'm developing an application which turns on and off flash and I want to add auto switching depending on the illuminance detected by the light sensor but I can't run my app. There are a lot of exceptions and I don't know why.</p> <p>There is my java code:</p> <pre><code>public class MainActivity extends Activity implements SensorEventListener, OnItemSelectedListener { private boolean isLighOn = false; private Camera camera; private SensorManager mSensorManager; private Sensor mLight; private boolean isSwitchingSet =false; private Parameters p; private float bound = 30; private Spinner spinner; private String[] illuminance = {"On when can't see nothing", "On when dark", "On when middle dark", "Always On"}; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mSensorManager = (SensorManager)this.getSystemService(Context.SENSOR_SERVICE); mLight = mSensorManager.getDefaultSensor(Sensor.TYPE_LIGHT); spinner = (Spinner) findViewById(R.id.spinner); final ImageButton ib = (ImageButton)findViewById(R.id.imageButton); final Button button= (Button)findViewById(R.id.button); this.getWindow().getDecorView().setBackgroundColor(Color.BLACK); button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if(mLight == null) { AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this); builder.setMessage("We're sorry, but on Your device accelerometer isn't available") .setCancelable(false) .setPositiveButton("OK", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.cancel(); } }); AlertDialog dialog = builder.create(); dialog.show(); } if(isSwitchingSet) { isSwitchingSet = false; Toast.makeText(MainActivity.this, "Switching off", Toast.LENGTH_SHORT).show(); mSensorManager.unregisterListener(MainActivity.this); } else { isSwitchingSet = true; mSensorManager.registerListener(MainActivity.this, mLight, SensorManager.SENSOR_DELAY_FASTEST); Toast.makeText(MainActivity.this, "Switching on", Toast.LENGTH_SHORT).show(); } } }); ArrayAdapter&lt;CharSequence&gt; adapter = new ArrayAdapter&lt;CharSequence&gt;(this, android.R.layout.simple_spinner_item, illuminance); adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); spinner.setAdapter(adapter); spinner.setOnItemSelectedListener(this); camera = Camera.open(); p = camera.getParameters(); ib.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (isLighOn) { p.setFlashMode(Parameters.FLASH_MODE_OFF); camera.setParameters(p); camera.stopPreview(); isLighOn = false; ib.setImageResource(R.drawable.button_power_off); } else { p.setFlashMode(Parameters.FLASH_MODE_TORCH); camera.setParameters(p); camera.startPreview(); isLighOn = true; ib.setImageResource(R.drawable.button_power_on_small); } } }); } @Override protected void onStop() { super.onStop(); if (camera != null) { camera.release(); } mSensorManager.unregisterListener(this); } @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; } @Override public void onAccuracyChanged(Sensor arg0, int arg1) { // TODO Auto-generated method stub } @Override public void onSensorChanged(SensorEvent event) { if(event.sensor.getType() == Sensor.TYPE_LIGHT) { p.setFlashMode(Parameters.FLASH_MODE_TORCH); camera.setParameters(p); camera.startPreview(); isLighOn = true; } } @Override public void onItemSelected(AdapterView&lt;?&gt; arg0, View arg1, int position, long arg3) { switch(position) { case 0: bound =30; break; case 1: bound =80; break; case 2: bound =170; break; case 3: bound =10000; break; } } @Override public void onNothingSelected(AdapterView&lt;?&gt; arg0) { // TODO Auto-generated method stub } </code></pre> <p>}</p> <p>And i declare these permisions in <code>Manifest.XML</code>:</p> <p> </p> <p>This is List of my Exceptions:</p> <pre><code>06-29 12:02:31.106: E/AndroidRuntime(2483): FATAL EXCEPTION: main 06-29 12:02:31.106: E/AndroidRuntime(2483): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.adrspo95.torch/com.adrspo95.torch.MainActivity}: java.lang.NullPointerException 06-29 12:02:31.106: E/AndroidRuntime(2483): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180) 06-29 12:02:31.106: E/AndroidRuntime(2483): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 06-29 12:02:31.106: E/AndroidRuntime(2483): at android.app.ActivityThread.access$600(ActivityThread.java:141) 06-29 12:02:31.106: E/AndroidRuntime(2483): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 06-29 12:02:31.106: E/AndroidRuntime(2483): at android.os.Handler.dispatchMessage(Handler.java:99) 06-29 12:02:31.106: E/AndroidRuntime(2483): at android.os.Looper.loop(Looper.java:137) 06-29 12:02:31.106: E/AndroidRuntime(2483): at android.app.ActivityThread.main(ActivityThread.java:5041) 06-29 12:02:31.106: E/AndroidRuntime(2483): at java.lang.reflect.Method.invokeNative(Native Method) 06-29 12:02:31.106: E/AndroidRuntime(2483): at java.lang.reflect.Method.invoke(Method.java:511) 06-29 12:02:31.106: E/AndroidRuntime(2483): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 06-29 12:02:31.106: E/AndroidRuntime(2483): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 06-29 12:02:31.106: E/AndroidRuntime(2483): at dalvik.system.NativeStart.main(Native Method) 06-29 12:02:31.106: E/AndroidRuntime(2483): Caused by: java.lang.NullPointerException 06-29 12:02:31.106: E/AndroidRuntime(2483): at com.adrspo95.torch.MainActivity.onCreate(MainActivity.java:94) 06-29 12:02:31.106: E/AndroidRuntime(2483): at android.app.Activity.performCreate(Activity.java:5104) 06-29 12:02:31.106: E/AndroidRuntime(2483): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) 06-29 12:02:31.106: E/AndroidRuntime(2483): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144) 06-29 12:02:31.106: E/AndroidRuntime(2483): ... 11 more 06-29 12:02:31.096: D/AndroidRuntime(2483): Shutting down VM 06-29 12:02:31.096: W/dalvikvm(2483): threadid=1: thread exiting with uncaught exception (group=0x40a71930) 06-29 12:02:31.106: E/AndroidRuntime(2483): FATAL EXCEPTION: main 06-29 12:02:31.106: E/AndroidRuntime(2483): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.adrspo95.torch/com.adrspo95.torch.MainActivity}: java.lang.NullPointerException 06-29 12:02:31.106: E/AndroidRuntime(2483): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180) 06-29 12:02:31.106: E/AndroidRuntime(2483): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 06-29 12:02:31.106: E/AndroidRuntime(2483): at android.app.ActivityThread.access$600(ActivityThread.java:141) 06-29 12:02:31.106: E/AndroidRuntime(2483): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 06-29 12:02:31.106: E/AndroidRuntime(2483): at android.os.Handler.dispatchMessage(Handler.java:99) 06-29 12:02:31.106: E/AndroidRuntime(2483): at android.os.Looper.loop(Looper.java:137) 06-29 12:02:31.106: E/AndroidRuntime(2483): at android.app.ActivityThread.main(ActivityThread.java:5041) 06-29 12:02:31.106: E/AndroidRuntime(2483): at java.lang.reflect.Method.invokeNative(Native Method) 06-29 12:02:31.106: E/AndroidRuntime(2483): at java.lang.reflect.Method.invoke(Method.java:511) 06-29 12:02:31.106: E/AndroidRuntime(2483): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 06-29 12:02:31.106: E/AndroidRuntime(2483): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 06-29 12:02:31.106: E/AndroidRuntime(2483): at dalvik.system.NativeStart.main(Native Method) 06-29 12:02:31.106: E/AndroidRuntime(2483): Caused by: java.lang.NullPointerException 06-29 12:02:31.106: E/AndroidRuntime(2483): at com.adrspo95.torch.MainActivity.onCreate(MainActivity.java:94) 06-29 12:02:31.106: E/AndroidRuntime(2483): at android.app.Activity.performCreate(Activity.java:5104) 06-29 12:02:31.106: E/AndroidRuntime(2483): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) 06-29 12:02:31.106: E/AndroidRuntime(2483): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144) 06-29 12:02:31.106: E/AndroidRuntime(2483): ... 11 more </code></pre>
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