This is my first post, so I apologize in advance...
I'm trying to compile a simple Drawer sample/practice app. When I click on the items in the listview, however, it crashes. Logcat says that it's not able to instantiate from android.app.Fragment. I've tried also using the android.support.v4 library -- assuming I implemented it correctly, which is dubious -- with the same results. Frankly I'm not sure what the difference is. I'm totally stumped. Please help!
MainActivity:
package pac.gazette;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.support.v4.widget.DrawerLayout;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
public class MainActivity extends Activity {
private String[] fragmentNames;
private String[] fragmentAddresses;
private DrawerLayout drawer;
private ListView drawerList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
fragmentNames = getResources().getStringArray(R.array.fragment_names);
fragmentAddresses = getResources().getStringArray(
R.array.fragment_options);
drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawerList = (ListView) findViewById(R.id.left_drawer);
drawerList.setAdapter(new ArrayAdapter<String>(this,
R.layout.drawer_list, fragmentNames));
drawerList.setOnItemClickListener (new CustomClickListener());
}
public class CustomClickListener implements OnItemClickListener {
@SuppressLint("NewApi") @Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
// drawer close handling
drawer.closeDrawer(drawerList);
// title handling (does not wait for drawer close)
if (position == 0) {
setTitle(new String("East Asia Gazette"));
} else {
setTitle(fragmentNames[position]);
}
// new fragment handling
FragmentTransaction transaction = getFragmentManager()
.beginTransaction();
transaction.replace(R.id.content_frame, Fragment.instantiate(
MainActivity.this, fragmentAddresses[position]));
transaction.commit();
}
}
}
Xml:
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<!-- The main content view -->
<FrameLayout
android:id="@+id/content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<!-- The navigation drawer -->
<ListView
android:id="@+id/left_drawer"
android:layout_width="200dp"
android:layout_height="match_parent"
android:layout_gravity="start"
android:choiceMode="singleChoice"
android:divider="@android:color/transparent"
android:dividerHeight="0dp"
android:background="#940032"/>
</android.support.v4.widget.DrawerLayout>
Logcat:
08-25 12:25:02.579: E/AndroidRuntime(17137): FATAL EXCEPTION: main
08-25 12:25:02.579: E/AndroidRuntime(17137): android.app.Fragment$InstantiationException: Unable to instantiate fragment pac.gazette.fragment_feed.xml: make sure class name exists, is public, and has an empty constructor that is public
08-25 12:25:02.579: E/AndroidRuntime(17137): at android.app.Fragment.instantiate(Fragment.java)
08-25 12:25:02.579: E/AndroidRuntime(17137): at android.app.Fragment.instantiate(Fragment.java)
08-25 12:25:02.579: E/AndroidRuntime(17137): at pac.gazette.MainActivity$CustomClickListener.onItemClick(MainActivity.java:56)
08-25 12:25:02.579: E/AndroidRuntime(17137): at android.widget.AdapterView.performItemClick(AdapterView.java)
08-25 12:25:02.579: E/AndroidRuntime(17137): at android.widget.AbsListView.performItemClick(AbsListView.java)
08-25 12:25:02.579: E/AndroidRuntime(17137): at android.widget.ListView.performItemClick(ListView.java)
08-25 12:25:02.579: E/AndroidRuntime(17137): at android.widget.AbsListView$PerformClick.run(AbsListView.java)
08-25 12:25:02.579: E/AndroidRuntime(17137): at android.widget.AbsListView$1.run(AbsListView.java)
08-25 12:25:02.579: E/AndroidRuntime(17137): at android.os.Handler.handleCallback(Handler.java)
08-25 12:25:02.579: E/AndroidRuntime(17137): at android.os.Handler.dispatchMessage(Handler.java)
08-25 12:25:02.579: E/AndroidRuntime(17137): at android.os.Looper.loop(Looper.java)
08-25 12:25:02.579: E/AndroidRuntime(17137): at android.app.ActivityThread.main(ActivityThread.java)
08-25 12:25:02.579: E/AndroidRuntime(17137): at java.lang.reflect.Method.invokeNative(Native Method)
08-25 12:25:02.579: E/AndroidRuntime(17137): at java.lang.reflect.Method.invoke(Method.java)
08-25 12:25:02.579: E/AndroidRuntime(17137): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java)
08-25 12:25:02.579: E/AndroidRuntime(17137): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java)
08-25 12:25:02.579: E/AndroidRuntime(17137): at dalvik.system.NativeStart.main(Native Method)
08-25 12:25:02.579: E/AndroidRuntime(17137): Caused by: java.lang.ClassNotFoundException: Didn't find class "pac.gazette.fragment_feed.xml" on path: /data/app/pac.gazette-2.apk
08-25 12:25:02.579: E/AndroidRuntime(17137): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java)
08-25 12:25:02.579: E/AndroidRuntime(17137): at java.lang.ClassLoader.loadClass(ClassLoader.java)
08-25 12:25:02.579: E/AndroidRuntime(17137): at java.lang.ClassLoader.loadClass(ClassLoader.java)
08-25 12:25:02.579: E/AndroidRuntime(17137): ... 17 more
Manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="pac.gazette"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="pac.gazette.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
I would recommend that you create your own Fragment and then make your own instantiation method:
Something like that:
public class MyFragment extends Fragment {
public MyFragment() {
// empty constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// here you can load whatever layout you want for your fragment
View v = inflater.inflate(R.layout.your_fragment_layout, container, false);
// for example set the address as a textview text, or do whatever you want with it
TextView tv = (TextView) v.findViewById(R.id.tvAddress);
tv.setText(getArguments().getString("address"));
return v;
}
public static MyFragment newInstance(String address) {
MyFragment myFragment = new MyFragment();
Bundle args = new Bundle();
args.putString("address", address);
myFragment.setArguments(args);
return myFragment;
}
}
And then inside the onItemClick() method:
// new fragment handling
FragmentTransaction transaction = getFragmentManager().beginTransaction();
transaction.replace(R.id.content_frame, MyFragmet.newInstance(fragmentAddresses[position]);
transaction.commit();