App stops when launch

Question

I'm trying to launch my APP and it never oppens, the only error that shows is :

        DEVICE SHELL COMMAND: am start -D -n "navigationdrawer.tutecentral.com.jddsoft_app/navigationdrawer.tutecentral.com.jddsoft_app.MainActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER
    WARNING: linker: app_process has text relocations. This is wasting memory and is a security risk. Please fix.
    WARNING: linker: app_process has text relocations. This is wasting memory and is a security risk. Please fix.
    Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=navigationdrawer.tutecentral.com.jddsoft_app/.MainActivity }
Warning: debug info can be unavailable. Please close other application using ADB: Monitor, DDMS, Eclipse

I don't have more apps running, I've closed the Android Studio and I've opened again and still without work.

EDITED *

 12-31 20:58:21.919  25772-25772/navigationdrawer.tutecentral.com.jddsoft_app E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: navigationdrawer.tutecentral.com.jddsoft_app, PID: 25772
    java.lang.RuntimeException: Unable to start activity ComponentInfo{navigationdrawer.tutecentral.com.jddsoft_app/navigationdrawer.tutecentral.com.jddsoft_app.MainActivity}: java.lang.NullPointerException
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2209)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2269)
            at android.app.ActivityThread.access$800(ActivityThread.java:139)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1210)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5102)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
            at dalvik.system.NativeStart.main(Native Method)
     Caused by: java.lang.NullPointerException
            at navigationdrawer.tutecentral.com.jddsoft_app.MainActivity.onCreate(MainActivity.java:76)
            at android.app.Activity.performCreate(Activity.java:5248)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1110)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2173)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2269)
            at android.app.ActivityThread.access$800(ActivityThread.java:139)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1210)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5102)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
            at dalvik.system.NativeStart.main(Native Method)

When I click (MainActivity.java:76)

 getActionBar().setDisplayHomeAsUpEnabled(true);

Is this the problem, that returns a nullPointerException?

Answer 1

Your action bar is returning null. Check if you have a theme where you have the actionBar, and that it has a title.

But if you are using min SDK < 11 then you have to use the appcompat library and use the supportActionBar which you can get using getSupportActionBar() and your activity will have to extend the ActionBarActivity.

Answer 2

try this, open cmd type

adb kill-server

then

adb start-server

and yes close eclipse and any other IDE's, then try to run the app