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我想为我的应用做一个4屏幕教程，但是当我尝试启动包含ViewPager的活动时收到此异常：Android View Pager IllegalStateException：已在此LayoutInflater上设置了一个工厂
java.lang.IllegalStateException: A factory has already been set on this LayoutInflater
at android.view.LayoutInflater.setFactory2(LayoutInflater.java:297)
at uk.co.chrisjenx.calligraphy.CalligraphyLayoutInflater.setFactory2(CalligraphyLayoutInflater.java:96)
at android.support.v4.view.LayoutInflaterCompatHC.setFactory(LayoutInflaterCompatHC.java:51)
at android.support.v4.view.LayoutInflaterCompat$LayoutInflaterCompatImplV11.setFactory(LayoutInflaterCompat.java:42)
at android.support.v4.view.LayoutInflaterCompat.setFactory(LayoutInflaterCompat.java:79)
at android.support.v4.app.Fragment.getLayoutInflater(Fragment.java:936)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:955)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1138)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:740)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1501)
at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:490)
at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141)
at android.support.v4.view.ViewPager.populate(ViewPager.java:1072)
at android.support.v4.view.ViewPager.populate(ViewPager.java:918)
at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1440)
at android.view.View.measure(View.java:16645)
at android.support.v4.widget.DrawerLayout.onMeasure(DrawerLayout.java:868)
at android.view.View.measure(View.java:16645)
at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:719)
at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:455)
at android.view.View.measure(View.java:16645)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at android.support.v7.internal.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:124)
at android.view.View.measure(View.java:16645)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
at android.view.View.measure(View.java:16645)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at android.view.View.measure(View.java:16645)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
at android.view.View.measure(View.java:16645)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2298)
at android.view.View.measure(View.java:16645)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1920)
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1117)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1299)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1004)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5692)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)
at android.view.Choreographer.doCallbacks(Choreographer.java:574)
at android.view.Choreographer.doFrame(Choreographer.java:544)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:212)
at android.app.ActivityThread.main(ActivityThread.java:515
起初我跟着this tutorial，但示例应用程序不使用支持库。比我试图按照this one仍然有例外。在我的手机上运行确定两个样本，想不通，为什么在我的项目是不工作
活动布局：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context="com.app.Tutorial.TutorialActivity">
<android.support.v4.view.ViewPager
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>
TutorialActivity：
import android.support.v4.app.FragmentActivity;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.os.Bundle;
public class TutorialActivity extends FragmentActivity {
private ViewPager mPager;
private PagerAdapter mPagerAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tutorial);
mPager = (ViewPager) findViewById(R.id.pager);
mPagerAdapter = new TutorialPagerAdapter(getSupportFragmentManager());
mPager.setAdapter(mPagerAdapter);
}
@Override
public void onBackPressed() {
if (mPager.getCurrentItem() == 0) {
// do nothing
} else {
// Otherwise, select the previous step.
mPager.setCurrentItem(mPager.getCurrentItem() - 1);
}
}
}
适配器：
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
public class TutorialPagerAdapter extends FragmentPagerAdapter {
public TutorialPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
TutorialFragment myFragment = new TutorialFragment();
Bundle data = new Bundle();
data.putInt("page", position);
myFragment.setArguments(data);
return myFragment;
}
@Override
public int getCount() {
return 3;
}
}
片段：
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class TutorialFragment extends Fragment {
private int mPageNumber;
public static TutorialFragment create(int pageNumber) {
TutorialFragment fragment = new TutorialFragment();
Bundle args = new Bundle();
args.putInt("page", pageNumber);
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mPageNumber = getArguments().getInt("page");
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_tutorial, container, false);
}
}
SDK是最新的，我的目标是sdk 22，最小版本是9 ... Other SO threads是关于使用getLayoutInflater().setFactory()，但我没有在任何地方使用它。对此有何暗示？谢谢！
[编辑]我使用com.android.support:support-v4:22.1.1，而工作示例使用com.android.support:support-v4:18.0.0