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POUp indicator does not show up
 

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    <p>I'm currently trying to enable <a href="http://developer.android.com/guide/topics/ui/actionbar.html#Up" rel="nofollow noreferrer">up navigation</a> in my Android app. To do so, I followed the tutorial and implemented the necessary code into my activity:</p> <h2>SettingsActivity.java</h2> <pre><code>package de.ntraum.arcon; import android.content.Intent; import android.os.Bundle; import android.preference.PreferenceActivity; import android.view.MenuItem; public class SettingsActivity extends PreferenceActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); getActionBar().setHomeButtonEnabled(true); addPreferencesFromResource(R.xml.settings); } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case android.R.id.home: startActivity(new Intent(SettingsActivity.this, MainActivity.class) .addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)); return true; default: return super.onOptionsItemSelected(item); } } } </code></pre> <p>If relevant, here's the <code>AndroidManifest.xml</code> and <code>styles.xml</code>:</p> <h2>AndroidManifest.xml</h2> <pre><code>&lt;manifest xmlns:android="http://schemas.android.com/apk/res/android" package="de.ntraum.arcon" android:versionCode="1" android:versionName="1.0" &gt; &lt;uses-sdk android:minSdkVersion="14" android:targetSdkVersion="15" /&gt; &lt;application android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/Light" &gt; &lt;activity android:name=".MainActivity" android:label="@string/title_activity_main" &gt; &lt;intent-filter&gt; &lt;action android:name="android.intent.action.MAIN" /&gt; &lt;category android:name="android.intent.category.LAUNCHER" /&gt; &lt;/intent-filter&gt; &lt;/activity&gt; &lt;activity android:name=".SettingsActivity" android:exported="false" android:label="@string/title_activity_settings" &gt; &lt;intent-filter&gt; &lt;category android:name="android.intent.category.PREFERENCE" /&gt; &lt;/intent-filter&gt; &lt;/activity&gt; &lt;/application&gt; &lt;/manifest&gt; </code></pre> <h2>styles.xml</h2> <pre><code>&lt;resources&gt; &lt;style name="Light" parent="android:Theme.Holo.Light.DarkActionBar" /&gt; &lt;style name="Dark" parent="android:Theme.Holo" /&gt; &lt;/resources&gt; </code></pre> <h2>Issue</h2> <p>The thing is, when accessing the activity, the up indicator in the action bar is missing. Nevertheless, the navigation is actually working (it takes me back to the <code>MainActivity.class</code>), it's just the small indicator that does not show up correctly.</p> <p><img src="https://i.stack.imgur.com/tMsY6.png" alt="Screenshot of Activity with missing up indic"></p> <p>I've tested it on my own device and in the emulator so far.</p>
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