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POAndroid -- Changing Tab Visibility from Inside Tab Activities
 

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    <p>I'm currently attempting to change tabs from inside of other activities -- that much is straight forward. However, I'm having trouble when attempting to set the visibility of other tabs.</p> <p>Essentially, I have an application load to a tab (login page) and the other tabs are invisible until the user logs in.</p> <p>When the user logs in, I want to make the other tabs visible and the login tab invisible.</p> <p>If there is a simple way of doing this, please make me aware of it--I'm currently running around in circles:</p> <p>Code Snippets:</p> <p>In the TabHost's OnCreate:</p> <pre><code>..... tabHost.setCurrentTab(3); tabHost.getTabWidget().getChildAt(0).setVisibility(View.GONE); tabHost.getTabWidget().getChildAt(1).setVisibility(View.GONE); tabHost.getTabWidget().getChildAt(2).setVisibility(View.GONE); .... </code></pre> <p>The TabHost's Extra Methods:</p> <pre><code>public void switchTab(int tab){ tabHost.setCurrentTab(tab); } public void visibleTabs(){ tabHost.getTabWidget().getChildAt(0).setVisibility(View.VISIBLE); tabHost.getTabWidget().getChildAt(1).setVisibility(View.VISIBLE); tabHost.getTabWidget().getChildAt(2).setVisibility(View.VISIBLE); tabHost.getTabWidget().getChildAt(3).setVisibility(View.GONE); } public void invisibleTabs(){ tabHost.getTabWidget().getChildAt(0).setVisibility(View.GONE); tabHost.getTabWidget().getChildAt(1).setVisibility(View.GONE); tabHost.getTabWidget().getChildAt(2).setVisibility(View.GONE); } </code></pre> <p>The Tab Activity:</p> <pre><code>public class LoginActivity extends Activity { EditText txt_username; EditText txt_password; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.login); Button btn = (Button)this.findViewById(R.id.login_button); final EditText txt_username = (EditText) findViewById(R.id.txt_username); final EditText txt_password = (EditText) findViewById(R.id.txt_username); btn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { String username = txt_username.getText().toString(); String password = txt_password.getText().toString(); switchTabInActivity(0); } }); } public void switchTabInActivity(long indexTabToSwitchTo){ waiter ParentActivity = (waiter) this.getParent(); ParentActivity.visibleTabs(); ParentActivity.switchTab(0); } } </code></pre> <p>LogCat is As Follows:</p> <pre><code>04-12 19:37:49.825: ERROR/AndroidRuntime(2744): FATAL EXCEPTION: main 04-12 19:37:49.825: ERROR/AndroidRuntime(2744): java.lang.NullPointerException 04-12 19:37:49.825: ERROR/AndroidRuntime(2744): at android.waiter.waiter.visibleTabs(waiter.java:130) 04-12 19:37:49.825: ERROR/AndroidRuntime(2744): at android.waiter.LoginActivity.switchTabInActivity(LoginActivity.java:56) 04-12 19:37:49.825: ERROR/AndroidRuntime(2744): at android.waiter.LoginActivity$1.onClick(LoginActivity.java:44) </code></pre> <p>Its obvious that the exception is coming from the invisible/visible settings.</p>
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