java - 安装 Android SDK Build-Tools 26 后无法启动 Activity ComponentInfo{...}

Question

我将Android Studio升级到2.3.3

然后我安装了 Android SDK Build-Tools 26

和 Android 8.0 (O)

并将compileSdkVersion和targetSdkVersion设置为26

“26.0.0”上的 buildToolsVersion

然后我将所有库版本从 25.3.1 更改为 26.0.0-alpha1

现在我有以下运行时异常:

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.mysite.myapp/com.mysite.myapp.MainActivity}: android.view.InflateException: Binary XML file line #35: Error inflating class fragment at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2417) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2480) at android.app.ActivityThread.access$800(ActivityThread.java:151) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1377) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:155) at android.app.ActivityThread.main(ActivityThread.java:5725) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1030) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:825) Caused by: android.view.InflateException: Binary XML file line #35: Error inflating class fragment at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:763) at android.view.LayoutInflater.rInflate(LayoutInflater.java:806) at android.view.LayoutInflater.inflate(LayoutInflater.java:504) at android.view.LayoutInflater.inflate(LayoutInflater.java:414) at android.view.LayoutInflater.inflate(LayoutInflater.java:365) at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:289) at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:139) at com.mysite.myapp.MainActivity.onCreate(MainActivity.java:65) at android.app.Activity.performCreate(Activity.java:6018) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1130) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2370) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2480)  at android.app.ActivityThread.access$800(ActivityThread.java:151)  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1377)  at android.os.Handler.dispatchMessage(Handler.java:102)  at android.os.Looper.loop(Looper.java:155)  at android.app.ActivityThread.main(ActivityThread.java:5725)  at java.lang.reflect.Method.invoke(Native Method)  at java.lang.reflect.Method.invoke(Method.java:372)  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1030)  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:825)  Caused by: java.lang.IllegalArgumentException: Setting FragmentDrawer{28990c1 #0 id=0x7f0f0095} as the target of FragmentDrawer{28990c1 #0 id=0x7f0f0095} would create a target cycle at android.support.v4.app.Fragment.setTargetFragment(Fragment.java:636) at com.mysite.myapp.Fragments.FragmentDrawer.onCreate(FragmentDrawer.java:83) at android.support.v4.app.Fragment.performCreate(Fragment.java:2226) at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1290) at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1502) at android.support.v4.app.FragmentManagerImpl.addFragment(FragmentManager.java:1737) at android.support.v4.app.FragmentManagerImpl.onCreateView(FragmentManager.java:3512) at android.support.v4.app.FragmentController.onCreateView(FragmentController.java:120) at android.support.v4.app.FragmentActivity.dispatchFragmentsOnCreateView(FragmentActivity.java:330) at android.support.v4.app.BaseFragmentActivityApi14.onCreateView(BaseFragmentActivityApi14.java:39) at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:75) at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:733) at android.view.LayoutInflater.rInflate(LayoutInflater.java:806)  at android.view.LayoutInflater.inflate(LayoutInflater.java:504)  at android.view.LayoutInflater.inflate(LayoutInflater.java:414)  at android.view.LayoutInflater.inflate(LayoutInflater.java:365)  at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:289)  at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:139)  at com.mysite.myapp.MainActivity.onCreate(MainActivity.java:65)  at android.app.Activity.performCreate(Activity.java:6018)  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1130)  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2370)  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2480)  at android.app.ActivityThread.access$800(ActivityThread.java:151)  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1377)  at android.os.Handler.dispatchMessage(Handler.java:102)  at android.os.Looper.loop(Looper.java:155)  at android.app.ActivityThread.main(ActivityThread.java:5725)  at java.lang.reflect.Method.invoke(Native Method)  at java.lang.reflect.Method.invoke(Method.java:372)  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1030)  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:825) 

(MainActivity.java:65) 和 (FragmentDrawer.java:83) 显示为链接。

MainActivity.java:65 内容:

setContentView(R.layout.activity_main);

FragmentDrawer.java:83内容:

setTargetFragment(FragmentDrawer.this, 100);

MainActivity之前有一个SplashActivity并且运行没有任何问题!

我刚刚降级了 SDK Build-Tools、compileSdkVersion、targetSdkVersion、buildToolsVersion 和库版本，以便再次运行和测试。使用预览版本没有问题。

有人可以帮助我吗？如何使用新的 SDK 版本运行我的应用程序？

Answer 1

问题出在这里:

java.lang.IllegalArgumentException:
Setting FragmentDrawer{28990c1 #0 id=0x7f0f0095} as the target of
FragmentDrawer{28990c1 #0 id=0x7f0f0095} would create a target cycle
at android.support.v4.app.Fragment.setTargetFragment(Fragment.java:636)

setTargetFragment 在 26.0.0 中已更改。之前，它只是设置目标 fragment 加上请求代码。从 26.0.0 开始，它在执行此操作之前包含两项检查:
- 检查当前 fragment 和目标 fragment 是否属于同一个 fragment 管理器
- 它通过扫描该 fragment 中的目标 fragment 列表并查看目标 fragment 是否已经存在来检查设置目标 fragment 是否会创建循环。

因此，您正在设置之前设置的目标 fragment 。不再允许这样做。