Android之提示Unable to instantiate fragment***MyLikeFragment .could not find Fragment constructor
16lz
2021-01-23
1 问题
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.appsinnova.android.keepdrop/com.appsinnova.android.keepdrop.account.favorite.activity.MyLikeActivity}: androidx.fragment.app.Fragment$InstantiationException: Unable to instantiate fragment com.appsinnova.android.keepdrop.fragment.MyLikeFragment: could not find Fragment constructor at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3782) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3961) at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:91) at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:149) at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:103) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2386) at android.os.Handler.dispatchMessage(Handler.java:107) at android.os.Looper.loop(Looper.java:213) at android.app.ActivityThread.main(ActivityThread.java:8178) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:513) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1101) Caused by: androidx.fragment.app.Fragment$InstantiationException: Unable to instantiate fragment com.appsinnova.android.keepdrop.fragment.MyLikeFragment: could not find Fragment constructor at androidx.fragment.app.Fragment.instantiate(Fragment.java:538) at androidx.fragment.app.FragmentContainer.instantiate(FragmentContainer.java:57) at androidx.fragment.app.FragmentManagerImpl$6.instantiate(FragmentManagerImpl.java:2851) at androidx.fragment.app.FragmentState.instantiate(FragmentState.java:85) at androidx.fragment.app.FragmentManagerImpl.restoreSaveState(FragmentManagerImpl.java:2488) at androidx.fragment.app.FragmentController.restoreSaveState(FragmentController.java:195) at androidx.fragment.app.FragmentActivity.onCreate(FragmentActivity.java:288) at androidx.appcompat.app.AppCompatActivity.onCreate(AppCompatActivity.java:115) at com.trello.rxlifecycle2.components.support.RxAppCompatActivity.onCreate(RxAppCompatActivity.java:59) at com.skyunion.android.base.RxBaseActivity.onCreate(RxBaseActivity.java:131) at com.appsinnova.android.keepdrop.base.BaseActivity.onCreate(BaseActivity.kt:26) at android.app.Activity.performCreate(Activity.java:8086) at android.app.Activity.performCreate(Activity.java:8074) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1313) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3755) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3961) at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:91) at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:149) at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:103) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2386) at android.os.Handler.dispatchMessage(Handler.java:107) at android.os.Looper.loop(Looper.java:213) at android.app.ActivityThread.main(ActivityThread.java:8178) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:513) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1101)
2 引发原因
我在Activity里面传递参数给Fragment的时候，对Fragment的构造方法去掉了，然后加了一个类型的参数放入构造函数
constructor(type: String) { this.type = type}这样很容易引发奔溃，如上，我们传递参数应该用setArguments方法通过bundle来传递需要的数据
3 解决办法
activity里面
var fragment = MyLikeFragment() val bundle = Bundle() bundle.putString(EXTRA_INDEX, info) fragment.arguments = bundle showFragment(fragment)fragment的onCreateView里面
var type = getArguments()?.getString(EXTRA_INDEX)
4、 总结
Activity和Fragment里面传递数据尽量用setArguments方法
千万不要用 Fragment的构造函数传递参数，各种坑。
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