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POAndroid fragment is not showing up
 

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  1. POAndroid fragment is not showing up
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    <p>I have the following codes in my android application:</p> <p>main.xml :</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" &gt; &lt;TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="activity" /&gt; &lt;fragment android:id="@+id/list" android:name="com.hugo.test.FragmentA" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="1" /&gt; &lt;/LinearLayout&gt; </code></pre> <p>fragmenta.xml :</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" &gt; &lt;TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="helloA" /&gt; &lt;/LinearLayout&gt; </code></pre> <p>FragmentA.java :</p> <pre><code>package com.hugo.test; //some imports here public class FragmentA extends Fragment { /** Called when the activity is first created. */ @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { //super.onCreate(savedInstanceState); //setContentView(R.layout.main); return inflater.inflate(R.layout.fragmenta, container, false); } } </code></pre> <p>FragmentActivity.java :</p> <pre><code> package com.hugo.test; //some imports here public class FragmentActivity extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); } } </code></pre> <p>The layout of the activity should display "activity" and the fragment should display "helloA". When I run my project I only see "activity", so it seems to me that the fragment is ignored at all.</p> <p>The error I see is :</p> <pre><code>12-19 09:01:05.370: E/AndroidRuntime(1352): FATAL EXCEPTION: main 12-19 09:01:05.370: E/AndroidRuntime(1352): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.hugo.test/com.hugo.test.FragmentActivity}: android.view.InflateException: Binary XML file line #12: Error inflating class fragment 12-19 09:01:05.370: E/AndroidRuntime(1352): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1751) 12-19 09:01:05.370: E/AndroidRuntime(1352): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1767) 12-19 09:01:05.370: E/AndroidRuntime(1352): at android.app.ActivityThread.access$1500(ActivityThread.java:122) 12-19 09:01:05.370: E/AndroidRuntime(1352): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1005) 12-19 09:01:05.370: E/AndroidRuntime(1352): at android.os.Handler.dispatchMessage(Handler.java:99) 12-19 09:01:05.370: E/AndroidRuntime(1352): at android.os.Looper.loop(Looper.java:132) 12-19 09:01:05.370: E/AndroidRuntime(1352): at android.app.ActivityThread.main(ActivityThread.java:4028) 12-19 09:01:05.370: E/AndroidRuntime(1352): at java.lang.reflect.Method.invokeNative(Native Method) 12-19 09:01:05.370: E/AndroidRuntime(1352): at java.lang.reflect.Method.invoke(Method.java:491) 12-19 09:01:05.370: E/AndroidRuntime(1352): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:844) 12-19 09:01:05.370: E/AndroidRuntime(1352): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:602) 12-19 09:01:05.370: E/AndroidRuntime(1352): at dalvik.system.NativeStart.main(Native Method) 12-19 09:01:05.370: E/AndroidRuntime(1352): Caused by: android.view.InflateException: Binary XML file line #12: Error inflating class fragment 12-19 09:01:05.370: E/AndroidRuntime(1352): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:688) 12-19 09:01:05.370: E/AndroidRuntime(1352): at android.view.LayoutInflater.rInflate(LayoutInflater.java:724) 12-19 09:01:05.370: E/AndroidRuntime(1352): at android.view.LayoutInflater.inflate(LayoutInflater.java:479) 12-19 09:01:05.370: E/AndroidRuntime(1352): at android.view.LayoutInflater.inflate(LayoutInflater.java:391) 12-19 09:01:05.370: E/AndroidRuntime(1352): at android.view.LayoutInflater.inflate(LayoutInflater.java:347) 12-19 09:01:05.370: E/AndroidRuntime(1352): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:245) 12-19 09:01:05.370: E/AndroidRuntime(1352): at android.app.Activity.setContentView(Activity.java:1780) 12-19 09:01:05.370: E/AndroidRuntime(1352): at com.hugo.test.FragmentActivity.onCreate(FragmentActivity.java:11) 12-19 09:01:05.370: E/AndroidRuntime(1352): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1048) 12-19 09:01:05.370: E/AndroidRuntime(1352): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1715) 12-19 09:01:05.370: E/AndroidRuntime(1352): ... 11 more 12-19 09:01:05.370: E/AndroidRuntime(1352): Caused by: android.app.Fragment$InstantiationException: Unable to instantiate fragment com.hugo.test.fragmenta: make sure class name exists, is public, and has an empty constructor that is public 12-19 09:01:05.370: E/AndroidRuntime(1352): at android.app.Fragment.instantiate(Fragment.java:500) 12-19 09:01:05.370: E/AndroidRuntime(1352): at android.app.Fragment.instantiate(Fragment.java:468) 12-19 09:01:05.370: E/AndroidRuntime(1352): at android.app.Activity.onCreateView(Activity.java:4132) 12-19 09:01:05.370: E/AndroidRuntime(1352): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:664) 12-19 09:01:05.370: E/AndroidRuntime(1352): ... 20 more 12-19 09:01:05.370: E/AndroidRuntime(1352): Caused by: java.lang.ClassNotFoundException: com.hugo.test.fragmenta in loader dalvik.system.PathClassLoader[/data/app/com.jochen.test-1.apk] 12-19 09:01:05.370: E/AndroidRuntime(1352): at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:251) 12-19 09:01:05.370: E/AndroidRuntime(1352): at java.lang.ClassLoader.loadClass(ClassLoader.java:540) 12-19 09:01:05.370: E/AndroidRuntime(1352): at java.lang.ClassLoader.loadClass(ClassLoader.java:500) 12-19 09:01:05.370: E/AndroidRuntime(1352): at android.app.Fragment.instantiate(Fragment.java:490) 12-19 09:01:05.370: E/AndroidRuntime(1352): ... 23 more </code></pre> <p>Because of that error I added a constructor to FragmentA.java </p> <pre><code>public FragmentA() { } </code></pre> <p>This error is not gone, the fragment still doesn't show up, same behavior as before. Anyone an idea?</p>
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