Null Object Reference with Intent
<p>So thx for any awnsers given :)<br>
the solution to my problem was, that my line </p>

<pre><code>Intent i = getIntent();
</code></pre>

<p>was not in my onCreate() function.<br>
Thank you and have a nice day.</p>

<p><br><br><hr><br><br>
i know, this kind of question was asked quite a lot on the internet, but i couldn't find any answer that helped me, so i will bring you here my special case.</p>

<p>This is my function in my MainActivity, where i create the Intent and Start my second activity:</p>

<pre><code>private void showArticle(String entryUrl, String entryTitle) {
    Intent intent = new Intent(this, ArticleActivity.class);
    intent.putExtra(EXTRA_URL, entryUrl.toString());
    intent.putExtra(EXTRA_TITLE, entryTitle.toString());
    Log.d("DEBUG", intent.getStringExtra(EXTRA_URL));
    Log.d("DEBUG", intent.getStringExtra(EXTRA_TITLE));
    Log.d("DEBUG", "EXTRAS PUTTED");
    startActivity(intent);
    Log.d("DEBUG", "ACTIVITY STARTED");
}
</code></pre>

<p>This is the console output:</p>

<pre><code>01-02 15:29:21.808 7108-7108/com.example.myfirstapp D/DEBUG: http://example.com/correct-url
01-02 15:29:21.809 7108-7108/com.example.myfirstapp D/DEBUG: Yeah, we have the correct title hhere
01-02 15:29:21.809 7108-7108/com.example.myfirstapp D/DEBUG: EXTRAS PUTTED
01-02 15:29:21.809 7108-7108/com.example.myfirstapp I/Timeline: Timeline: Activity_launch_request id:com.example.myfirstapp time:1404863384
01-02 15:29:21.815 7108-7108/com.example.myfirstapp D/DEBUG: ACTIVITY STARTED
</code></pre>

<p><br><br>
Sooo... 'til here everything works fine. Then, who guessed it, my second activity opens up:</p>

<pre><code>Intent i = getIntent();

...

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_article);
    getActionBar().setDisplayHomeAsUpEnabled(true);
    if (i.getStringExtra(MainActivity.EXTRA_TITLE) == null) {
        setTitle("MEEP");
    } else {
        setTitle(i.getStringExtra(MainActivity.EXTRA_TITLE));
    }

    ...
</code></pre>

<p>But now my App crashes with this error message:</p>

<pre><code>01-02 15:29:21.855 7108-7108/com.example.myfirstapp D/AndroidRuntime: Shutting down VM
01-02 15:29:21.870 7108-7108/com.example.myfirstapp E/AndroidRuntime:
        FATAL EXCEPTION: main
        Process: com.example.myfirstapp, PID: 7108
        java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.myfirstapp/com.example.myfirstapp.article.ArticleActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.content.Intent.getStringExtra(java.lang.String)' on a null object reference
          at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2379)
          at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2442)
          at android.app.ActivityThread.access$800(ActivityThread.java:156)
          at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1351)
          at android.os.Handler.dispatchMessage(Handler.java:102)
          at android.os.Looper.loop(Looper.java:211)
          at android.app.ActivityThread.main(ActivityThread.java:5373)
          at java.lang.reflect.Method.invoke(Native Method)
          at java.lang.reflect.Method.invoke(Method.java:372)
          at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1020)
          at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:815)
        Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.content.Intent.getStringExtra(java.lang.String)' on a null object reference
          at com.example.myfirstapp.article.ArticleActivity.onCreate(ArticleActivity.java:44)
          at android.app.Activity.performCreate(Activity.java:5990)
          at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
          at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2332)
          at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2442) 
          at android.app.ActivityThread.access$800(ActivityThread.java:156) 
          at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1351) 
          at android.os.Handler.dispatchMessage(Handler.java:102) 
          at android.os.Looper.loop(Looper.java:211) 
          at android.app.ActivityThread.main(ActivityThread.java:5373) 
          at java.lang.reflect.Method.invoke(Native Method) 
          at java.lang.reflect.Method.invoke(Method.java:372) 
          at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1020) 
          at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:815)
</code></pre>

<p><br><br><br>
Now my question is: why do i get a null pointer? i mean, the log clearly shows that the extra is put in the intent, why doesn't my second activity receive the key values? Can anyone help?<br>
And thx for every tip. <br><br>for any more information, just write a comment :)</p>