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POError in getting Android device ID
 

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    <p>I am trying to retrieve the device ID of my adroid device in my android app. However, error exists and the program cannot launch after I added the following line in my program:</p> <pre><code>String ts = Context.TELEPHONY_SERVICE; TelephonyManager mTelephonyMgr = (TelephonyManager) getSystemService(ts); </code></pre> <p>From the logcat, it says problems come fromt the second line:</p> <pre><code>07-18 11:28:47.453: E/AndroidRuntime(5528): FATAL EXCEPTION: main 07-18 11:28:47.453: E/AndroidRuntime(5528): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{android.reader/android.reader.Reader}: java.lang.NullPointerException 07-18 11:28:47.453: E/AndroidRuntime(5528): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1880) 07-18 11:28:47.453: E/AndroidRuntime(5528): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981) 07-18 11:28:47.453: E/AndroidRuntime(5528): at android.app.ActivityThread.access$600(ActivityThread.java:123) 07-18 11:28:47.453: E/AndroidRuntime(5528): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147) 07-18 11:28:47.453: E/AndroidRuntime(5528): at android.os.Handler.dispatchMessage(Handler.java:99) 07-18 11:28:47.453: E/AndroidRuntime(5528): at android.os.Looper.loop(Looper.java:137) 07-18 11:28:47.453: E/AndroidRuntime(5528): at android.app.ActivityThread.main(ActivityThread.java:4424) 07-18 11:28:47.453: E/AndroidRuntime(5528): at java.lang.reflect.Method.invokeNative(Native Method) 07-18 11:28:47.453: E/AndroidRuntime(5528): at java.lang.reflect.Method.invoke(Method.java:511) 07-18 11:28:47.453: E/AndroidRuntime(5528): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 07-18 11:28:47.453: E/AndroidRuntime(5528): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 07-18 11:28:47.453: E/AndroidRuntime(5528): at dalvik.system.NativeStart.main(Native Method) 07-18 11:28:47.453: E/AndroidRuntime(5528): Caused by: java.lang.NullPointerException 07-18 11:28:47.453: E/AndroidRuntime(5528): at android.reader.Reader.&lt;init&gt;(Reader.java:51) 07-18 11:28:47.453: E/AndroidRuntime(5528): at java.lang.Class.newInstanceImpl(Native Method) 07-18 11:28:47.453: E/AndroidRuntime(5528): at java.lang.Class.newInstance(Class.java:1319) 07-18 11:28:47.453: E/AndroidRuntime(5528): at android.app.Instrumentation.newActivity(Instrumentation.java:1023) 07-18 11:28:47.453: E/AndroidRuntime(5528): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1871) 07-18 11:28:47.453: E/AndroidRuntime(5528): ... 11 more </code></pre> <p>I think it is caused by the permission problem, but I have already added the following line in Manifest file:</p> <pre><code>&lt;uses-permission android:name="android.permission.READ_PHONE_STATE" /&gt; </code></pre> <p>So, may I ask how can I tackle this problem?</p>
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