Question

我的应用程序有一个包含三个元素的底部菜单。如果单击它，则会出现相应的片段。当我尝试快速一个接一个地单击更多对象时，会出现问题。

这是Android Studio上的运行报告所说的：

java.lang.IllegalStateException: Restarter must be created only during owner's initialization stage
    at androidx.savedstate.SavedStateRegistryController.performRestore(SavedStateRegistryController.java:58)
    at androidx.fragment.app.Fragment.performCreate(Fragment.java:2585)
    at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:838)
    at androidx.fragment.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManagerImpl.java:1238)
    at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:1303)
    at androidx.fragment.app.BackStackRecord.executeOps(BackStackRecord.java:439)
    at androidx.fragment.app.FragmentManagerImpl.executeOps(FragmentManagerImpl.java:2079)
    at androidx.fragment.app.FragmentManagerImpl.executeOpsTogether(FragmentManagerImpl.java:1869)
    at androidx.fragment.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManagerImpl.java:1824)
    at androidx.fragment.app.FragmentManagerImpl.execPendingActions(FragmentManagerImpl.java:1727)
    at androidx.fragment.app.FragmentManagerImpl$2.run(FragmentManagerImpl.java:150)
    at android.os.Handler.handleCallback(Handler.java:873)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:193)
    at android.app.ActivityThread.main(ActivityThread.java:6669)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)

这是我的底部菜单xml：

<RelativeLayout 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_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context=".MainActivity"
tools:showIn="@layout/activity_main">

<com.google.android.material.bottomnavigation.BottomNavigationView
    android:id="@+id/main_nav"
    android:layout_width="wrap_content"
    android:layout_height="56dp"
    android:layout_alignParentStart="true"
    android:layout_alignParentBottom="true"
    app:itemBackground="@color/colorPrimary"
    app:itemIconTint="@color/nav_bar_color"
    app:itemTextColor="@color/nav_bar_color"
    app:menu="@menu/nav_items">


</com.google.android.material.bottomnavigation.BottomNavigationView>

<FrameLayout
    android:id="@+id/main_frame"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_above="@id/main_nav"
    android:layout_alignParentStart="true"
    android:layout_alignParentTop="true"
    android:layout_alignParentEnd="true"
    android:layout_marginStart="0dp"
    android:layout_marginTop="56dp"
    android:layout_marginEnd="0dp"
    android:layout_marginBottom="0dp" /></RelativeLayout>

这是我的MainActivity.class（仅是片段/菜单的代码）：

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    //Other stuff....

    Toolbar toolbar = findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    mMainFrame = (FrameLayout) findViewById(R.id.main_frame);
    mMainNav = (BottomNavigationView) findViewById((R.id.main_nav));

    homeFragment = new HomeFragment();
    filterFragment = new FilterFragment();
    logsFragment = new LogsFragment();

    setFragment(homeFragment);


    mMainNav.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
        @Override
        public boolean onNavigationItemSelected(@NonNull MenuItem item) {

            switch (item.getItemId()){

                case R.id.nav_home :
                    mMainNav.setItemBackgroundResource(R.color.colorPrimary);
                    setFragment(homeFragment);
                    return true;

                case R.id.nav_filter:
                    mMainNav.setItemBackgroundResource(R.color.colorPrimary);
                    setFragment(filterFragment);
                    return true;

                case R.id.nav_logs :
                    mMainNav.setItemBackgroundResource(R.color.colorPrimary);
                    setFragment(logsFragment);
                    return true;

                default :
                    return false;

            }
        }
    });

}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.

    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        startActivity(new Intent(MainActivity.this, Setting.class));
        return true;
    }

    return super.onOptionsItemSelected(item);
}
private void setFragment(Fragment fragment) {

    FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction().setCustomAnimations(R.anim.enter_right_to_left, R.anim.exit_rigth_to_left, R.anim.enter_left_to_right, R.anim.exit_left_to_right);
    fragmentTransaction.replace(R.id.main_frame, fragment);
    fragmentTransaction.commit();
}}

最后，这是我的xml事务之一（enter_left_to_right.xml）：

<set xmlns:android="http://schemas.android.com/apk/res/android">
<translate
    android:fromXDelta="-100%"
    android:toXDelta="0%"
    android:fromYDelta="0%"
    android:toYDelta="0%"
    android:duration="250"/></set>

我在互联网上进行搜索，但找不到任何有用的帮助吗？

（我的应用使用sdk 29编译，并支持26到29）

底部导航栏崩溃

0 个答案: