Question

即使我实现了如下所述的方法，在Activity和Fragment中都不会调用

onOptionsItemSelected：Add onOptionsItemSelected calling in Fragment
我有一个活动：

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    return super.onCreateOptionsMenu(menu); // false by default. so goes to fragment
    // If return true, than stay in the activity
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    Toast.makeText(this, "onOptionsItemSelected", Toast.LENGTH_SHORT).show();
    switch(item.getItemId())
    {
        default:
            return super.onOptionsItemSelected(item);
            // false by default. so goes to fragment
            // If returns true stays in activity.
    }
}

这是行不通的片段：

@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setHasOptionsMenu(true);((AppCompatActivity)activity).getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}



@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
    inflater.inflate(R.menu.menu_edit_mode,menu);
    setHasOptionsMenu(true);
    super.onCreateOptionsMenu(menu, inflater);
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    Toast.makeText(activity,"onOptionItemSelected", Toast.LENGTH_SHORT).show(); // Not Invoked!!!
    if (!isDataInitialized()) return true;
    switch (item.getItemId()) {

          case R.id.item_share:  // Share Icon
            callUsernamesDialog();
            return true;


        case android.R.id.home: // Back pressing
            ( (ActivityProfile)activity).onBackPressed();
            return true;

        default:
            return super.onOptionsItemSelected(item);
    }

}

它的onOptionsItemSelected没有被调用，但菜单已成功膨胀。在其他片段中，一切正常，我看不到实现上的任何区别。
在其他片段中，在活动和片段中均调用onOptionsItemSelected。在这个特定的片段中我能找到什么来阻止它工作？

我们将不胜感激！提前致谢！

更新
我找到了解决方案，现在可以单击项目，但对此有疑问。

问题是我在片段中使用了scrollView，因为其中有很多元素：

<?xml version="1.0" encoding="utf-8"?>

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

<LinearLayout
    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="wrap_content"
    android:id="@+id/fragment_edit_data_layout"
    tools:context=".UserStuff.EditData.FragmentEditData"
    android:orientation="vertical"
    >
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="55dp"
        android:fontFamily="cursive"
        android:lineSpacingExtra="10sp"
        android:text="@string/edit_data"
        android:textAlignment="center"
        android:textAllCaps="false"
        android:textAppearance="@style/TextAppearance.AppCompat.Button"
        android:textColor="@color/colorPrimary"
        android:textSize="60sp"
        android:textStyle="bold"
        android:typeface="serif" />

    <EditText
        android:id="@+id/et_title"
        style="@android:style/Widget.AutoCompleteTextView"
        android:layout_width="match_parent"
        android:layout_height="100dp"
        android:fontFamily="serif"
        android:hint="@string/title"
        android:inputType="textEmailAddress"
        android:textAppearance="@style/TextAppearance.AppCompat.Caption"
        android:textColor="@android:color/background_dark"
        android:textSize="18sp" />

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        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"
        >
        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_margin="8dp"
            android:text="@string/folder_category"
            />
        <android.support.v7.widget.AppCompatButton
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_marginLeft="@dimen/standard_21"
            android:layout_gravity="center"
            android:id="@+id/btn_category"
            android:text="@string/untitled"
            android:textSize="14sp"
            />
        <android.support.v7.widget.AppCompatButton
            android:layout_margin="8dp"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:textSize="14sp"
            android:text="@string/refresh"
            android:id="@+id/btn_refresh"
            />
    </LinearLayout>
    <EditText
        android:id="@+id/et_description"
        style="@android:style/Widget.AutoCompleteTextView"
        android:layout_width="match_parent"
        android:layout_height="100dp"
        android:fontFamily="serif"
        android:hint="@string/description"
        android:inputType="textEmailAddress"
        android:layout_margin="8dp"
        android:textAppearance="@style/TextAppearance.AppCompat.Caption"
        android:textColor="@android:color/background_dark"
        android:textSize="18sp" />

    <android.support.v7.widget.AppCompatButton
        android:id="@+id/btn_edit_data"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:backgroundTint="@color/colorPrimary"
        android:text="@string/tap_to_edit"
        android:textAlignment="center"
        android:textAllCaps="false"
        android:textColor="@color/cardview_light_background"
        android:textSize="24sp"/>

    <android.support.v7.widget.RecyclerView
        android:id="@+id/rv_edit_data"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scrollbars="vertical" />

</LinearLayout>


</ScrollView>

删除ScrollView并使用LinearLayout作为根视图解决了该问题，问题是为什么？我看不到有关的文档。谢谢！

Answer 1

尝试一下，它在我的身边工作在活动中添加菜单

 @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_edit_mode, menu);  
    return true;  
}  

@Override  
public boolean onOptionsItemSelected(MenuItem item) {  
   int id = item.getItemId();  
    switch (id){  
        case R.id.item1:  
            Toast.makeText(getApplicationContext(),"Item 1 Selected",Toast.LENGTH_LONG).show();  
            return true;  
        case R.id.item2:  
            Toast.makeText(getApplicationContext(),"Item 2 Selected",Toast.LENGTH_LONG).show();  
            return true;  
        case R.id.item3:  
            Toast.makeText(getApplicationContext(),"Item 3 Selected",Toast.LENGTH_LONG).show();  
            return true;  
        default:  
            return super.onOptionsItemSelected(item);  
    }  
}

用于片段设置菜单

在Fragment的onCreate（Bundle savedInstanceState）方法中添加setHasOptionsMenu（true）方法。

在Fragment中重写onCreateOptionsMenu（菜单菜单，MenuInflater充气器）（如果要在Fragment菜单中执行其他操作）和onOptionsItemSelected（MenuItem item）方法。

在onOptionsItemSelected（MenuItem item）活动的方法内，请确保当将在onOptionsItemSelected（MenuItem item）Fragment的方法中实施菜单项操作时，返回false。

活动

 @Override
public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater inflater = getSupportMenuInflater();
    inflater.inflate(R.menu.main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {

        case R.id.activity_menu_item:

            // Do Activity menu item stuff here
            return true;

        case R.id.fragment_menu_item:

            // Not implemented here
            return false;
        default:
            break;
    }

    return false;
}

片段

 @Override
public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater inflater = getSupportMenuInflater();
    inflater.inflate(R.menu.main, menu);
    return true;
}
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setHasOptionsMenu(true);
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
    // Do something that differs the Activity's menu here
    super.onCreateOptionsMenu(menu, inflater);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
        case R.id.activity_menu_item:
            // Not implemented here
            return false;
        case R.id.fragment_menu_item:
            // Do Fragment menu item stuff here
            return true;

        default:
            break;
    }

    return false;
}

尽管使用ScrollView实现了方法，但未调用OnOptionsItemSelected

1 个答案: