我试图放置片段来替换布局中已经存在的片段
这是我的mainactivity.xml布局：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:baselineAligned="false">
<LinearLayout
android:id="@+id/listviewFragment"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="match_parent"
></LinearLayout>
<LinearLayout
android:id="@+id/detailFragment"
android:layout_width="0dp"
android:layout_weight="2"
android:layout_height="match_parent"
></LinearLayout>
</LinearLayout>
这是我的主要活动课程：
public class MainActivity extends FragmentActivity implements
FragmentListViewActivity.OnItemSelectedListener {
/* (non-Javadoc)
* @see android.support.v4.app.FragmentActivity#onCreate(android.os.Bundle)
*/
@Override
protected void onCreate(Bundle arg0) {
// TODO Auto-generated method stub
super.onCreate(arg0);
setContentView(R.layout.activity_main);
FragmentTransaction transaction =
getSupportFragmentManager().beginTransaction();
FragmentListViewActivity toadd = new FragmentListViewActivity();
transaction.add(R.id.listviewFragment, toadd);
transaction.addToBackStack(null);
transaction.commit();
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
DetailFragmentActivity detail = new DetailFragmentActivity();
ft.add(R.id.detailFragment, detail);
ft.addToBackStack(null);
ft.commit();
}
@Override
public void onItemSelected(String link) {
// TODO Auto-generated method stub
if(link != null && link.equalsIgnoreCase("Monday")){
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
MondayActivity detail = new MondayActivity();
ft.replace(R.id.detailFragment, detail);
ft.addToBackStack(null);
ft.commit();
}
if(link != null && link.equalsIgnoreCase("Tuesday")){
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
TuesdayActivity detail = new TuesdayActivity();
ft.replace(R.id.detailFragment, detail);
ft.addToBackStack(null);
ft.commit();
}
if(link != null && link.equalsIgnoreCase("Wednesday")){
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
WednesdayActivity detail = new WednesdayActivity();
ft.replace(R.id.detailFragment, detail);
ft.addToBackStack(null);
ft.commit();
}
}
}
这是我的FragmentlistViewActivity
public class FragmentListViewActivity extends Fragment {
private OnItemSelectedListener listener;
ListView listview;
String[] list = new String[] {"Monday","Tuesday","Wednesday"};
/* (non-Javadoc)
* @see android.app.ListFragment#onCreateView(android.view.LayoutInflater,
android.view.ViewGroup, android.os.Bundle)
*/
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
View view =
inflater.inflate(R.layout.layout_fragment_listviewitems_screen,
container, false);
listview = (ListView)
view.findViewById(R.id.layout_frgment_listitems_listview);
ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>
(getActivity(), android.R.layout.simple_list_item_1,list);
listview.setAdapter(arrayAdapter);
listview.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> av, View v, int position,long itemId) {
// TODO Auto-generated method stub
String link = (String) listview.getItemAtPosition(position);
listener.onItemSelected(link);
}
});
return view;
}
public interface OnItemSelectedListener {
public void onItemSelected(String link);
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
if (activity instanceof OnItemSelectedListener) {
listener = (OnItemSelectedListener) activity;
} else {
throw new ClassCastException(activity.toString()
+ " must implemenet FragmentListViewActivity.OnItemSelectedListener");
}
}
}
这是我的DetailFragmentActivity：
public class DetailFragmentActivity extends Fragment {
/* (non-Javadoc)
* @see android.app.Fragment#onCreateView(android.view.LayoutInflater,
android.view.ViewGroup, android.os.Bundle)
*/
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
View view = inflater.inflate(R.layout.layout_fragment_items_screen,
container, false);
return view;
}
}
logcat的：
06-27 00:35:26.024: W/dalvikvm(25210): threadid=1: thread exiting with uncaught
exception (group=0x40a551f8)
06-27 00:35:26.064: E/AndroidRuntime(25210): FATAL EXCEPTION: main
06-27 00:35:26.064: E/AndroidRuntime(25210): android.view.InflateException: Binary XML
file line #2: Error inflating class fragment
06-27 00:35:26.064: E/AndroidRuntime(25210): at
android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:697)
06-27 00:35:26.064: E/AndroidRuntime(25210): at
android.view.LayoutInflater.inflate(LayoutInflater.java:466)
06-27 00:35:26.064: E/AndroidRuntime(25210): at
android.view.LayoutInflater.inflate(LayoutInflater.java:396)
06-27 00:35:26.064: E/AndroidRuntime(25210): at
com.farmer.financial.estimation.MondayActivity.onCreateView(MondayActivity.java:26)
06-27 00:35:26.064: E/AndroidRuntime(25210): at
android.support.v4.app.Fragment.performCreateView(Fragment.java:1460)
06-27 00:35:26.064: E/AndroidRuntime(25210): at
android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:911)
06-27 00:35:26.064: E/AndroidRuntime(25210): at
android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1088)
06-27 00:35:26.064: E/AndroidRuntime(25210): at
android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
06-27 00:35:26.064: E/AndroidRuntime(25210): at
android.support.v4.app.FragmentManagerImpl.execPendingActions
(FragmentManager.java:1444)
06-27 00:35:26.064: E/AndroidRuntime(25210): at
android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:429)
06-27 00:35:26.064: E/AndroidRuntime(25210): at
android.os.Handler.handleCallback(Handler.java:605)
06-27 00:35:26.064: E/AndroidRuntime(25210): at
android.os.Handler.dispatchMessage(Handler.java:92)
06-27 00:35:26.064: E/AndroidRuntime(25210): at
android.os.Looper.loop(Looper.java:137)
06-27 00:35:26.064: E/AndroidRuntime(25210): at
android.app.ActivityThread.main(ActivityThread.java:4424)
06-27 00:35:26.064: E/AndroidRuntime(25210): at
java.lang.reflect.Method.invokeNative(Native Method)
06-27 00:35:26.064: E/AndroidRuntime(25210): at
java.lang.reflect.Method.invoke(Method.java:511)
06-27 00:35:26.064: E/AndroidRuntime(25210): at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
06-27 00:35:26.064: E/AndroidRuntime(25210): at
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
06-27 00:35:26.064: E/AndroidRuntime(25210): at
dalvik.system.NativeStart.main(Native Method)
06-27 00:35:26.064: E/AndroidRuntime(25210): Caused by:
java.lang.NullPointerException: name == null
06-27 00:35:26.064: E/AndroidRuntime(25210): at
java.lang.VMClassLoader.findLoadedClass(Native Method)
06-27 00:35:26.064: E/AndroidRuntime(25210): at
java.lang.ClassLoader.findLoadedClass(ClassLoader.java:354)
06-27 00:35:26.064: E/AndroidRuntime(25210): at
java.lang.ClassLoader.loadClass(ClassLoader.java:491)
06-27 00:35:26.064: E/AndroidRuntime(25210): at 1
java.lang.ClassLoader.loadClass(ClassLoader.java:461)
06-27 00:35:26.064: E/AndroidRuntime(25210): at
android.support.v4.app.Fragment.instantiate(Fragment.java:391)
06-27 00:35:26.064: E/AndroidRuntime(25210): at
android.support.v4.app.Fragment.instantiate(Fragment.java:369)
06-27 00:35:26.064: E/AndroidRuntime(25210): at
android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:272)
06-27 00:35:26.064: E/AndroidRuntime(25210): at
android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:669)
06-27 00:35:26.064: E/AndroidRuntime(25210): ... 18 more
我尝试了所有可能性，但我错了一些在哪里请给我一些解决方案。提前谢谢。
答案 0 :(得分：0)
这里不完全确定，但是，如果您使用的是v4支持片段，我建议您在活动中以这种方式实例化片段：
Fragment.instantiate(this, MyFragment.class.getName());
无论如何，检查您是否从支持v4片段扩展，因为您正在使用supportFragmentManager
编辑：
首先检查您的片段是否从支持片段扩展。您可以检查观看片段导入。这是导入：
import android.support.v4.app.Fragment;
如果你有这个导入import android.app.Fragment;，你正在将正常片段和支持片段混合在一起。
然后当您更换片段或添加使用supportFragmentmanager而不是使用
时FragmentListViewActivity toadd = new FragmentListViewActivity();
使用此：
FragmentListViewActivity toadd = Fragment.instantiante(this,FragmentListViewActivity.class.getName());