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POAndroid getAssets() method throws NullPointerException
 

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    <p>I'm trying to get assets of my app from Service and i get nullpointexception. I found few articles about it.but i don't get where my mistake.</p> <p>Where is the code:</p> <pre><code>public class OCRService extends IntentService{ private static final String TAG = "OCRService"; public static final String DATA_PATH = Environment.getExternalStorageDirectory().toString() + "/SimpleAndroidOCR/"; public OCRService() { super("OCRService"); String path = new String(DATA_PATH + "tessdata/"); File dir = new File(path); if (!new File(path).exists() &amp;&amp; !dir.mkdirs()) { Log.e(TAG, "ERROR: Creation of directory " + path + " on sdcard failed"); return; } else { Log.v(TAG, "Created directory " + path + " on sdcard"); if (!(new File(DATA_PATH + "tessdata/" + "eng.traineddata")).exists()) { try { AssetManager assetManager = getAssets(); for (String file : assetManager.list("tessdata")) { InputStream in = assetManager.open("tessdata/" + file); OutputStream out = new FileOutputStream(DATA_PATH + "tessdata/" + file); byte[] buf = new byte[1024]; int len; while ((len = in.read(buf)) &gt; 0) { out.write(buf, 0, len); } in.close(); out.close(); } Log.v(TAG, "Copying ocr traineddata sacceded"); } catch (IOException e) { Log.e(TAG, "Was unable to copy osr traineddata "+ e.toString()); } } } } </code></pre> <p>Where is the exception:</p> <pre><code>FATAL EXCEPTION: main java.lang.RuntimeException: Unable to instantiate service com.pc.droidhelper.services.OCRService: java.lang.NullPointerException at android.app.ActivityThread.handleCreateService(ActivityThread.java:2241) at android.app.ActivityThread.access$1600(ActivityThread.java:127) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1205) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:137) at android.app.ActivityThread.main(ActivityThread.java:4476) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:511) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:816) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:583) at dalvik.system.NativeStart.main(Native Method) Caused by: java.lang.NullPointerException at android.content.ContextWrapper.getApplicationContext(ContextWrapper.java:101) at com.pc.droidhelper.services.OCRService.&lt;init&gt;(OCRService.java:41) at java.lang.Class.newInstanceImpl(Native Method) at java.lang.Class.newInstance(Class.java:1319) at android.app.ActivityThread.handleCreateService(ActivityThread.java:2238) ... 10 more </code></pre> <p>as you can see getAssets is called from Service. and i have context there. I have read that I chould use getAssets from main activity. please tel my why, what is the difference.</p>
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    1. COIt's probably due to the fact that you use a Constructor for your init. Services and Activities don't use the normal "use a constructor" approach, but rather get called by Intents coupled with `startActivity()/startService()`. Then they do their initializations in `onCreate()`
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