Android：应用程序由于未知原因而崩溃
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【中文标题】Android：应用程序由于未知原因而崩溃【英文标题】：Android: App crashes due to unknown reasons 【发布时间】：2017-04-22 17:54:35 【问题描述】：我有一个 android 应用，在这个 Activity 中有两个片段，我没有在片段中添加任何代码，这里是 Activity：
schedule_settings.java
public class schedule_settings extends AppCompatActivity
Fragment fragment;
Button dailyButton, weeklyButton;
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_schedule_settings); //The error occurs here according to log cat...
//Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
//setSupportActionBar(toolbar);
if (getActionBar() != null)
getActionBar().setDisplayHomeAsUpEnabled(true);
getActionBar().setTitle("Schedule Settings");
getSupportActionBar().hide();
else if (getSupportActionBar() != null)
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setTitle("Schedule Settings");
dailyButton = (Button) findViewById(R.id.scheduleSettingsDailyButton);
weeklyButton = (Button) findViewById(R.id.scheduleSettingsWeeklyButton);
this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
//getLoaderManager().initLoader(0, null, );
public void launchWeeklyFragment(View view)
fragment = new schedule_settings_weekly();
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.scheduleSettingsFragment, fragment);
fragmentTransaction.commit();
this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LOCKED);
dailyButton.setBackground(getResources().getDrawable(R.drawable.left_rounded_button_not_clicked));
weeklyButton.setBackground(getResources().getDrawable(R.drawable.right_rounded_button_clicked));
public void launchDailyFragment(View view)
fragment = new schedule_setting_daily();
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.scheduleSettingsFragment, fragment);
fragmentTransaction.commit();
this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LOCKED);
dailyButton.setBackground(getResources().getDrawable(R.drawable.left_rounded_button_clicked));
weeklyButton.setBackground(getResources().getDrawable(R.drawable.right_rounded_button_not_clicked));
这是相同的xml，它由activity_schedule_settings.xml 和content_schedule_settings.xml 两部分组成。这是activity_schedule_settings.xml：
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_
android:layout_
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context="com.example.android.smartswitch.schedule_settings">
<android.support.design.widget.AppBarLayout
android:layout_
android:layout_
android:theme="@style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_
android:layout_
android:background="?attr/colorPrimary"
app:popupTheme="@style/AppTheme.PopupOverlay" />
</android.support.design.widget.AppBarLayout>
<include layout="@layout/content_schedule_settings" />
</android.support.design.widget.CoordinatorLayout>
这里是 content_schedule_settings_main.xml：
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_
android:layout_
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="com.example.android.smartswitch.schedule_settings"
tools:showIn="@layout/activity_schedule_settings">
<LinearLayout
android:layout_
android:layout_
android:orientation="vertical">
<LinearLayout
android:layout_
android:layout_
android:layout_marginTop="20dp"
android:gravity="center"
android:orientation="horizontal"
android:padding="20dp">
<Button
android:id="@+id/scheduleSettingsDailyButton"
android:layout_
android:layout_
android:background="@drawable/left_rounded_button_clicked"
android:onClick="launchDailyFragment"
android:text="Daily" />
<Button
android:id="@+id/scheduleSettingsWeeklyButton"
android:layout_
android:layout_
android:background="@drawable/right_rounded_button_not_clicked"
android:onClick="launchWeeklyFragment"
android:text="Weekly" />
</LinearLayout>
<fragment
android:id="@+id/scheduleSettingsFragment"
android:layout_
android:layout_ />
</LinearLayout>
</ScrollView>
错误发生在marked java 部分。这是日志猫跟踪，我不知道该怎么做，因为它将我实际将 xml 文件分配给 java 的部分标记为错误：
04-22 16:55:51.045 12130-12130/com.example.android.smartswitch E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.android.smartswitch, PID: 12130
java.lang.RuntimeException: Unable to start activity ComponentInfocom.example.android.smartswitch/com.example.android.smartswitch.schedule_settings: android.view.InflateException: Binary XML file line #43: Binary XML file line #43: Error inflating class fragment
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: android.view.InflateException: Binary XML file line #43: Binary XML file line #43: Error inflating class fragment
at android.view.LayoutInflater.inflate(LayoutInflater.java:539)
at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:288)
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:143)
at com.example.android.smartswitch.schedule_settings.onCreate(schedule_settings.java:25)
at android.app.Activity.performCreate(Activity.java:6237)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: android.view.InflateException: Binary XML file line #43: Error inflating class fragment
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:782)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:835)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:838)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:288)
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:143)
at com.example.android.smartswitch.schedule_settings.onCreate(schedule_settings.java:25)
at android.app.Activity.performCreate(Activity.java:6237)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.NullPointerException
at java.lang.VMClassLoader.findLoadedClass(Native Method)
at java.lang.ClassLoader.findLoadedClass(ClassLoader.java:362)
at java.lang.ClassLoader.loadClass(ClassLoader.java:499)
at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
at android.support.v4.app.Fragment.isSupportFragmentClass(Fragment.java:459)
at android.support.v4.app.FragmentManagerImpl.onCreateView(FragmentManager.java:3321)
at android.support.v4.app.FragmentController.onCreateView(FragmentController.java:120)
at android.support.v4.app.FragmentActivity.dispatchFragmentsOnCreateView(FragmentActivity.java:378)
at android.support.v4.app.BaseFragmentActivityHoneycomb.onCreateView(BaseFragmentActivityHoneycomb.java:33)
at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:79)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:754)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:835)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:838)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:288)
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:143)
at com.example.android.smartswitch.schedule_settings.onCreate(schedule_settings.java:25)
at android.app.Activity.performCreate(Activity.java:6237)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
我是 android 新手，这个错误给我带来了很多问题，我试图用谷歌搜索，但找不到任何相关信息。请帮忙...
【问题讨论】：
【参考方案1】：java.lang.RuntimeException：无法启动活动 组件信息com.example.android.smartswitch/com.example.android.smartswitch.schedule_settings：
android.view.InflateException：二进制 XML 文件第 43 行：二进制 XML 文件line #43：膨胀class片段时出错
您应该在content_schedule_settings XML 中将class 名称添加到您的<fragment />。
试试这个：
<fragment
android:id="@+id/scheduleSettingsFragment"
android:layout_
android:layout_
class="com.example.android.smartswitch.schedule_settings_weekly" />
希望这会完美运行。
【讨论】：
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