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POAccessing layout components on fragments in activity?
 

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  1. POAccessing layout components on fragments in activity?
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    <p>I changed my activity_main.xml layout in three tabs using fragments. I want access to all my tab components in MainActivity, like I did before, but I get NullPointersException. What I am doing wrong here. Thanks!</p> <p>My fragment code:</p> <pre><code>import android.app.Fragment; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.EditText; public class FragMent3 extends Fragment { EditText textBox; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.logbook_view, null); return view; } } </code></pre> <p>Code for third layout tab:</p> <pre><code>&lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" &gt; &lt;Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Send request" android:onClick="onSendButtonClicked" /&gt; &lt;EditText android:id="@+id/editText1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:hint="Write request.." android:ems="10" /&gt; &lt;/LinearLayout&gt; </code></pre> <p>Parts of MainActivity code:</p> <pre><code>@SuppressLint("NewApi") public class MainActivity extends Activity implements TabListener { RelativeLayout rl; EditText textBox; static int x; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); textBox = (EditText)findViewById(R.id.editText1); try { rl = (RelativeLayout) findViewById(R.id.mainLayout); fragMentTra = getFragmentManager().beginTransaction(); ActionBar bar = getActionBar(); bar.addTab(bar.newTab().setText("Info").setTabListener(this)); bar.addTab(bar.newTab().setText("Pilot").setTabListener(this)); bar.addTab(bar.newTab().setText("Logbook").setTabListener(this)); bar.setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM | ActionBar.DISPLAY_USE_LOGO); bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); bar.setDisplayShowHomeEnabled(true); bar.setDisplayShowTitleEnabled(false); bar.show(); } catch (Exception e) { e.getMessage(); } /** * Hiding Action Bar */ } FragMent1 fram1; FragmentTransaction fragMentTra = null; FragMent2 fram2; FragMent3 fram3; /* @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.activity_main, menu); return true; }*/ @Override public void onTabReselected(Tab tab, FragmentTransaction ft) { } @Override public void onTabSelected(Tab tab, FragmentTransaction ft) { if (tab.getText().equals("Info")) { try { rl.removeAllViews(); } catch (Exception e) { } fram1 = new FragMent1(); fragMentTra.addToBackStack(null); fragMentTra = getFragmentManager().beginTransaction(); fragMentTra.add(rl.getId(), fram1); fragMentTra.commit(); } else if (tab.getText().equals("Pilot")) { try { rl.removeAllViews(); } catch (Exception e) { } fram2 = new FragMent2(); fragMentTra.addToBackStack(null); fragMentTra = getFragmentManager().beginTransaction(); fragMentTra.add(rl.getId(), fram2); fragMentTra.commit(); } else if (tab.getText().equals("Logbook")) { try { rl.removeAllViews(); } catch (Exception e) { } fram3 = new FragMent3(); fragMentTra.addToBackStack(null); fragMentTra = getFragmentManager().beginTransaction(); fragMentTra.add(rl.getId(), fram3); fragMentTra.commit(); } } @Override public void onTabUnselected(Tab tab, FragmentTransaction ft) { } public void onSendButtonClicked(View view) { textBox.setText("some text on third tab EditText"); } </code></pre> <p>LogCat:</p> <pre><code>05-06 12:42:19.993: E/AndroidRuntime(29991): FATAL EXCEPTION: main 05-06 12:42:19.993: E/AndroidRuntime(29991): java.lang.IllegalStateException: Could not execute method of the activity 05-06 12:42:19.993: E/AndroidRuntime(29991): at android.view.View$1.onClick(View.java:3103) 05-06 12:42:19.993: E/AndroidRuntime(29991): at android.view.View.performClick(View.java:3574) 05-06 12:42:19.993: E/AndroidRuntime(29991): at android.view.View$PerformClick.run(View.java:14293) 05-06 12:42:19.993: E/AndroidRuntime(29991): at android.os.Handler.handleCallback(Handler.java:605) 05-06 12:42:19.993: E/AndroidRuntime(29991): at android.os.Handler.dispatchMessage(Handler.java:92) 05-06 12:42:19.993: E/AndroidRuntime(29991): at android.os.Looper.loop(Looper.java:137) 05-06 12:42:19.993: E/AndroidRuntime(29991): at android.app.ActivityThread.main(ActivityThread.java:4441) 05-06 12:42:19.993: E/AndroidRuntime(29991): at java.lang.reflect.Method.invokeNative(Native Method) 05-06 12:42:19.993: E/AndroidRuntime(29991): at java.lang.reflect.Method.invoke(Method.java:511) 05-06 12:42:19.993: E/AndroidRuntime(29991): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:823) 05-06 12:42:19.993: E/AndroidRuntime(29991): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:590) 05-06 12:42:19.993: E/AndroidRuntime(29991): at dalvik.system.NativeStart.main(Native Method) 05-06 12:42:19.993: E/AndroidRuntime(29991): Caused by: java.lang.reflect.InvocationTargetException 05-06 12:42:19.993: E/AndroidRuntime(29991): at java.lang.reflect.Method.invokeNative(Native Method) 05-06 12:42:19.993: E/AndroidRuntime(29991): at java.lang.reflect.Method.invoke(Method.java:511) 05-06 12:42:19.993: E/AndroidRuntime(29991): at android.view.View$1.onClick(View.java:3098) 05-06 12:42:19.993: E/AndroidRuntime(29991): ... 11 more 05-06 12:42:19.993: E/AndroidRuntime(29991): Caused by: java.lang.NullPointerException 05-06 12:42:19.993: E/AndroidRuntime(29991): at com.example.colibri2bbui.MainActivity.onSendButtonClicked(MainActivity.java:201) 05-06 12:42:19.993: E/AndroidRuntime(29991): ... 14 more </code></pre>
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      1. VTUpMod
    1. COadd your fragments to `FrameLayout`, not `RelativeLayout`.
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    2. CO@Android-Developer that doesn't explain a NPE, does it?
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      1. USAballano
 

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