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POButton visibility/invisibility issue.
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copied!<p>I am working android application that required login, Now I want After successfully login into my application, login button should be invisible and logout button should be visible, but getting errors.</p> <p>I am using this function:</p> <pre><code>login.setVisibility(View.GONE); & logout.setVisibility(View.VISIBLE); </code></pre> <p>Eclipse give me error in logcat like: </p> <pre><code>java.lang.RuntimeException: Unable to start activity ComponentInfo{com.rahul.cheerfoolz/com.rahul.cheerfoolz.CheerfoolznativeActivity}: java.lang.NullPointerException. </code></pre> <p>Main.class</p> <pre><code>protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); session = new SessionID(); Button login = (Button) findViewById(R.id.home_btn_feature_login); Button logout = (Button) findViewById(R.id.home_btn_feature_logout); int userID = SessionID.getUserID(); System.out.println("value of the userID into the main page:====>"+userID); // when user login then here I got the userID value if ((userID) > 0) { login.setVisibility(View.GONE); //when Execute this give me error logout.setVisibility(View.VISIBLE); //when Execute this give me error } else { login.setVisibility(View.VISIBLE); //when Execute this give me error logout.setVisibility(View.GONE); //when Execute this give me error } setContentView(R.layout.main); setHeader_home(""); } </code></pre> <p>Main.xml</p> <pre><code> <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_weight="2" android:orientation="horizontal" >  <Button android:id="@+id/home_btn_feature_login" style="@style/HomeButton" android:drawableTop="@drawable/login_button" android:onClick="onClickFeature" android:text="@string/title_feature_login" />  <Button android:id="@+id/home_btn_feature_logout" style="@style/HomeButton" android:drawableTop="@drawable/logout_button" android:onClick="onClickFeature" android:text="@string/title_feature_logout" /> <Button android:id="@+id/home_btn_feature2" style="@style/HomeButton" android:drawableTop="@drawable/register_button" android:onClick="onClickFeature" android:text="@string/title_feature_register" /> </LinearLayout> </code></pre>

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