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POMultiple Activities in Android
 

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    <p>I am creating multiple activities in Android. When I run the app, it can't connect to other activities so just wondering. These are my code, I have 3 xml files and 3 java files. </p> <p>This is logcat log file.</p> <p>log.txt</p> <pre><code>05-03 01:57:10.335: E/PhonePolicy(23020): Could not preload class for phone policy: com.android.internal.policy.impl.PhoneWindow$ContextMenuCallback 05-03 01:57:12.665: W/dalvikvm(23020): threadid=1: thread exiting with uncaught exception (group=0x409db1f8) 05-03 01:57:12.705: E/AndroidRuntime(23020): FATAL EXCEPTION: main 05-03 01:57:12.705: E/AndroidRuntime(23020): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.jumoun.itemp/com.jumoun.itemp.Temperature}: java.lang.NullPointerException 05-03 01:57:12.705: E/AndroidRuntime(23020): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1880) 05-03 01:57:12.705: E/AndroidRuntime(23020): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981) 05-03 01:57:12.705: E/AndroidRuntime(23020): at android.app.ActivityThread.access$600(ActivityThread.java:123) 05-03 01:57:12.705: E/AndroidRuntime(23020): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147) 05-03 01:57:12.705: E/AndroidRuntime(23020): at android.os.Handler.dispatchMessage(Handler.java:99) 05-03 01:57:12.705: E/AndroidRuntime(23020): at android.os.Looper.loop(Looper.java:137) 05-03 01:57:12.705: E/AndroidRuntime(23020): at android.app.ActivityThread.main(ActivityThread.java:4427) 05-03 01:57:12.705: E/AndroidRuntime(23020): at java.lang.reflect.Method.invokeNative(Native Method) 05-03 01:57:12.705: E/AndroidRuntime(23020): at java.lang.reflect.Method.invoke(Method.java:511) 05-03 01:57:12.705: E/AndroidRuntime(23020): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795) 05-03 01:57:12.705: E/AndroidRuntime(23020): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:562) 05-03 01:57:12.705: E/AndroidRuntime(23020): at dalvik.system.NativeStart.main(Native Method) 05-03 01:57:12.705: E/AndroidRuntime(23020): Caused by: java.lang.NullPointerException 05-03 01:57:12.705: E/AndroidRuntime(23020): at android.app.Activity.findViewById(Activity.java:1794) 05-03 01:57:12.705: E/AndroidRuntime(23020): at com.jumoun.itemp.Temperature.&lt;init&gt;(Temperature.java:14) 05-03 01:57:12.705: E/AndroidRuntime(23020): at java.lang.Class.newInstanceImpl(Native Method) 05-03 01:57:12.705: E/AndroidRuntime(23020): at java.lang.Class.newInstance(Class.java:1319) 05-03 01:57:12.705: E/AndroidRuntime(23020): at android.app.Instrumentation.newActivity(Instrumentation.java:1023) 05-03 01:57:12.705: E/AndroidRuntime(23020): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1871) 05-03 01:57:12.705: E/AndroidRuntime(23020): ... 11 more 05-03 01:57:14.115: I/Process(23020): Sending signal. PID: 23020 SIG: 9 </code></pre>
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    1. CODid you add your Activities to your Manifest?
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    2. COWhat is at line 14 if `Temperature`? Something is `null` most likely you are trying to access a `View` that isn't in the inflated `layout`
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    3. CO@Tom if that were the case then the OP would have a different exception
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