片段中工具栏上的android上下文操作栏

问题描述

在横向模式下，我需要为活动中的特定片段显示上下文ActionBar。

我当前的应用看起来像这样
my app

动作模式启动后
action mode active

我想要达到的目标是这样的
wanted action mode only on fragment

我使用toolbar.startActionMode在服装ActionBar上启动androidx.appcompat.widget.Toolbar，但它似乎并没有绑定到组件本身，而是绑定了整个活动。

我所有的代码：

SecondFragment.java

public class SecondFragment extends Fragment {

    public static SecondFragment newInstance() {
        return new SecondFragment();
    }

    private ActionMode selectionMenu;
    private Toolbar toolbar;

    @Override
    public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.second_fragment,container,false);
        view.setBackgroundColor(Color.YELLOW);
        return view;
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
    }

FirstFragment.java

public class FirstFragment extends Fragment {

    public static FirstFragment newInstance() {
        return new FirstFragment();
    }

    private ActionMode selectionMenu;
    private Toolbar toolbar;

    @Override
    public View onCreateView(LayoutInflater inflater,Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.first_fragment,false);
        toolbar = (Toolbar)view.findViewById(R.id.toolbarTR);
        toolbar.inflateMenu(R.menu.drag_and_drop_menu);
        toolbar.setTitle("my toolbar");
        toolbar.setOnMenuItemClickListener(new Toolbar.OnMenuItemClickListener() {
            @Override
            public boolean onMenuItemClick(MenuItem item) {
                if(item.getItemId() == R.id.SaveChangesButton) {
                    selectionMenu = toolbar.startActionMode(new ActionMode.Callback() {
                        @Override
                        public boolean onCreateActionMode(ActionMode mode,Menu menu) {
                            mode.setTitle(R.string.selection_menu_counter_text);
                            mode.getMenuInflater().inflate(R.menu.selection_menu,menu);
                            return true;
                        }

                        @Override
                        public boolean onPrepareActionMode(ActionMode mode,Menu menu) {
                            return false;
                        }

                        @Override
                        public boolean onActionItemClicked(ActionMode mode,MenuItem item) {
                            switch(item.getItemId()) {
                                case R.id.ShareFoldersButton:
                                    Toast.makeText(getContext(),"Share",Toast.LENGTH_SHORT).show();
                                    return true;
                                case R.id.DeleteFoldersButton:
                                    Toast.makeText(getContext(),"Delete",Toast.LENGTH_SHORT).show();
                                    return true;
                                case R.id.MergeFoldersButton:
                                    Toast.makeText(getContext(),"Merge",Toast.LENGTH_SHORT).show();
                                    return true;
                                case R.id.CopyFoldersButton:
                                    Toast.makeText(getContext(),"Copy",Toast.LENGTH_SHORT).show();
                                    return true;
                                default:
                                    return false;
                            }
                        }

                        @Override
                        public void onDestroyActionMode(ActionMode mode) {}
                    });
                    return true;
                }
                return false;
            }
        });
        view.setBackgroundColor(Color.CYAN);
        return view;
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
    }

}

MainActivity.java

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_activity);
        if (savedInstanceState == null) {
            getSupportFragmentManager().beginTransaction()
                    .replace(R.id.container,FirstFragment.newInstance())
                    .commitNow();
        }
    }
}

layout-land / main_activity.xml

<LinearLayout
    android:layout_height="match_parent"
    android:layout_width="match_parent"
    android:orientation="horizontal"
    xmlns:android="http://schemas.android.com/apk/res/android">

    <fragment android:layout_height="match_parent"
        android:layout_width="0dp"
        android:layout_weight="1"
        android:id="@+id/headlines_fragment"
        android:name="com.opensourcedocumentscanner.test.ui.main.FirstFragment"/>

    <fragment android:layout_height="match_parent"
        android:layout_width="0dp"
        android:layout_weight="2"
        android:id="@+id/article_fragment"
        android:name="com.opensourcedocumentscanner.test.ui.main.SecondFragment"/>

</LinearLayout>

layout / main_activity.xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/fragment_container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" />

layout / first_fragment.xml

<androidx.constraintlayout.widget.ConstraintLayout 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:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".test.ui.main.FirstFragment">

    <androidx.appcompat.widget.Toolbar
        android:id="@+id/toolbarTR"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="?attr/colorPrimary"
        android:minHeight="?attr/actionBarSize"
        android:theme="?attr/actionBarTheme"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/message"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="First Fragment"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

layout / second_fragment.xml

<androidx.constraintlayout.widget.ConstraintLayout 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:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".test.ui.main.FirstFragment">

    <TextView
        android:id="@+id/message"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Second Fragment"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

解决方法

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