在我的项目中，我有两个类 1).FragmentTestActivty--------扩展 FragmentActivty 2).TestFragment ------------- -----扩展片段
FragmentTestActivty.java
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTransaction;
public class FragmentTestActivity extends FragmentActivity implements
OnItemClickListener {
@Override
public void onCreate(Bundle savedInstanceState) {// first
System.out.println("1");
super.onCreate(savedInstanceState);
setContentView(com.example.fragmenttest.R.layout.main);
l = (ListView) findViewById(com.example.fragmenttest.R.id.number_list);
l.setAdapter(new MyCustomAdapter());
l.setOnItemClickListener(FragmentTestActivity.this);
/** Called when a number gets clicked */
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
number = position;
System.out.println("clicking or not");
name = option[number];
Fragment f = new TestFragment(position + 1);
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.replace(R.id.the_frag, f);
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
ft.addToBackStack(null);
ft.commit();
}
}
测试片段.java
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
public class TestFragment extends Fragment {
public TestFragment() {
}
/* Constructor for being created explicitly */
public TestFragment(int nAndroids) {
this.nAndroids = nAndroids;
}
/* If we are being created with saved state, restore our state */
public void onCreate(Bundle saved) {
super.onCreate(saved);
if (null != saved) {
nAndroids = saved.getInt("nAndroids");
}
}
public void onSaveInstanceState(Bundle toSave) {
toSave.putInt("nAndroids", nAndroids);
}
View v;
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle saved) {
c = getActivity().getApplicationContext();
LayoutInflater in = getActivity().getLayoutInflater();
v = in.inflate(R.layout.list, null);
LinearLayout lf = (LinearLayout) v.findViewById(R.id.frgmentpart);
System.out.println(nAndroids + "n android");
ListView lv2 = (ListView) v.findViewById(R.id.listView2);
if (nAndroids == 1) {
lv2 = (ListView) v.findViewById(R.id.listView2);
lv2.setAdapter(new listview2());
;
System.out.println("inside");
} else if (nAndroids > 1) {
System.out.println("outside " + lf);
lf.setVisibility(View.GONE);
// v=in.inflate(R.layout.list2, null);
}
return v;
}
}
错误
06-05 16:25:41.535: E/AndroidRuntime(335): FATAL EXCEPTION: main
06-05 16:25:41.535: E/AndroidRuntime(335): java.lang.RuntimeException: Unable to instantiate activity
ComponentInfo{com.example.fragmenttest/com.example.fragmenttest.FragmentTestActivity}: java.lang.ClassNotFoundException: com.example.fragmenttest.FragmentTestActivity in loader dalvik.system.PathClassLoader[/data/app/com.example.fragmenttest-2.apk]
06-05 16:25:41.535: E/AndroidRuntime(335): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1569)
06-05 16:25:41.535: E/AndroidRuntime(335): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
06-05 16:25:41.535: E/AndroidRuntime(335): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
06-05 16:25:41.535: E/AndroidRuntime(335): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
06-05 16:25:41.535: E/AndroidRuntime(335): at android.os.Handler.dispatchMessage(Handler.java:99)
06-05 16:25:41.535: E/AndroidRuntime(335): at android.os.Looper.loop(Looper.java:123)
06-05 16:25:41.535: E/AndroidRuntime(335): at android.app.ActivityThread.main(ActivityThread.java:3683)
06-05 16:25:41.535: E/AndroidRuntime(335): at java.lang.reflect.Method.invokeNative(Native Method)
06-05 16:25:41.535: E/AndroidRuntime(335): at java.lang.reflect.Method.invoke(Method.java:507)
06-05 16:25:41.535: E/AndroidRuntime(335): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
06-05 16:25:41.535: E/AndroidRuntime(335): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
06-05 16:25:41.535: E/AndroidRuntime(335): at dalvik.system.NativeStart.main(Native Method)
06-05 16:25:41.535: E/AndroidRuntime(335): Caused by: java.lang.ClassNotFoundException: com.example.fragmenttest.FragmentTestActivity in loader dalvik.system.PathClassLoader[/data/app/com.example.fragmenttest-2.apk]
06-05 16:25:41.535: E/AndroidRuntime(335): at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:240)
06-05 16:25:41.535: E/AndroidRuntime(335): at java.lang.ClassLoader.loadClass(ClassLoader.java:551)
06-05 16:25:41.535: E/AndroidRuntime(335): at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
06-05 16:25:41.535: E/AndroidRuntime(335): at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
06-05 16:25:41.535: E/AndroidRuntime(335): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1561)
06-05 16:25:41.535: E/AndroidRuntime(335): ... 11 more
清单文件
?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.fragmenttest"
>
<uses-sdk android:minSdkVersion="7"
android:targetSdkVersion="10" />
<application
android:icon="@drawable/icon"
android:label="@string/app_name"
android:theme="@android:style/Theme.Black"
>
<activity android:name=".FragmentTestActivity"
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>
图片 |--------------------------| | | | | | | | | 片段 | |活动| | | |testfragment.java| | | | | | | |----- ---------| |