报错Caused by: java.lang.ClassNotFoundException: Didn't find class "android.view.PagerTabStrip"

报错信息：

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: FATAL EXCEPTION: main

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: Process: tech.androidstudio.pagetabstripdemo, PID: 15801

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: java.lang.RuntimeException: Unable to start activity ComponentInfo{tech.androidstudio.pagetabstripdemo/tech.androidstudio.pagetabstripdemo.MainActivity}: android.view.InflateException:
Binary XML file line #13: Error inflating class PagerTabStrip

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2314)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2386)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at android.app.ActivityThread.access$800(ActivityThread.java:148)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1292)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:102)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at android.os.Looper.loop(Looper.java:135)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:5310)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at java.lang.reflect.Method.invoke(Method.java:372)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:901)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:696)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: Caused by: android.view.InflateException: Binary XML file line #13: Error inflating class PagerTabStrip

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:757)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at android.view.LayoutInflater.rInflate(LayoutInflater.java:806)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at android.view.LayoutInflater.rInflate(LayoutInflater.java:809)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at android.view.LayoutInflater.inflate(LayoutInflater.java:504)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at android.view.LayoutInflater.inflate(LayoutInflater.java:414)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at android.view.LayoutInflater.inflate(LayoutInflater.java:365)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:256)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:109)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at tech.androidstudio.pagetabstripdemo.MainActivity.onCreate(MainActivity.java:21)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at android.app.Activity.performCreate(Activity.java:5953)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1128)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2267)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2386)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at android.app.ActivityThread.access$800(ActivityThread.java:148)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1292)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:102)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at android.os.Looper.loop(Looper.java:135)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:5310)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at java.lang.reflect.Method.invoke(Method.java:372)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:901)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:696)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime:
Caused by: java.lang.ClassNotFoundException: Didn't find class "android.view.PagerTabStrip"
on path: DexPathList[[zip file "/data/app/tech.androidstudio.pagetabstripdemo-1/base.apk"],nativeLibraryDirectories=[/vendor/lib, /system/lib]]

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at java.lang.ClassLoader.loadClass(ClassLoader.java:511)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at java.lang.ClassLoader.loadClass(ClassLoader.java:469)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at android.view.LayoutInflater.createView(LayoutInflater.java:571)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at android.view.LayoutInflater.onCreateView(LayoutInflater.java:665)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:65)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at android.view.LayoutInflater.onCreateView(LayoutInflater.java:682)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:741)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at android.view.LayoutInflater.rInflate(LayoutInflater.java:806)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at android.view.LayoutInflater.rInflate(LayoutInflater.java:809)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at android.view.LayoutInflater.inflate(LayoutInflater.java:504)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at android.view.LayoutInflater.inflate(LayoutInflater.java:414)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at android.view.LayoutInflater.inflate(LayoutInflater.java:365)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:256)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:109)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at tech.androidstudio.pagetabstripdemo.MainActivity.onCreate(MainActivity.java:21)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at android.app.Activity.performCreate(Activity.java:5953)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1128)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2267)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2386)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at android.app.ActivityThread.access$800(ActivityThread.java:148)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1292)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:102)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at android.os.Looper.loop(Looper.java:135)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:5310)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at java.lang.reflect.Method.invoke(Method.java:372)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:901)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:696)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime:
Suppressed: java.lang.ClassNotFoundException: android.view.PagerTabStrip

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at java.lang.Class.classForName(Native Method)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at java.lang.BootClassLoader.findClass(ClassLoader.java:781)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: at java.lang.ClassLoader.loadClass(ClassLoader.java:504)

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime:
... 27 more

03-14 20:24:09.675 15801-15801/tech.androidstudio.pagetabstripdemo E/AndroidRuntime: Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available

原因：

在布局里面直接写了PagerTabStrip，应该在布局里面写下面的全路劲：android.support.v4.view.PagerTabStrip

<?xml version="1.0" encoding="utf-8"?>
<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=".MainActivity">

<android.support.v4.view.ViewPager
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/viewpage">
<PagerTabStripandroid:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/PagerTabStrip"></PagerTabStrip>
</android.support.v4.view.ViewPager>
</RelativeLayout>

解决方法”：

应该在布局里面写下面的全路劲：android.support.v4.view.PagerTabStrip

<?xml version="1.0" encoding="utf-8"?>
<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=".MainActivity">

<android.support.v4.view.ViewPager
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/viewpage">
<android.support.v4.view.PagerTabStrip
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/PagerTabStrip"></android.support.v4.view.PagerTabStrip>
</android.support.v4.view.ViewPager>
</RelativeLayout>