[英]How to change items' properties in RecyclerView when chosing a specified item programatically?
[英]How to change toolbar in recyclerview when item is longclicked?
我想删除recyclerview中的项目。
我希望在我单击longclick时更改工具栏形状。
我使用可见性做到了这一点,但工作成功,但是我不确定这种方式是否正确。
这是使用数据绑定的toolbar.xml。
<data>
<import type = "android.view.View" />
<variable
name = "isDeleteToolbar"
type = "boolean"/>
</data>
<android.support.v7.widget.Toolbar
android:id = "@+id/toolbar_search"
android:layout_width = "match_parent"
android:layout_height = "wrap_content"
>
<android.support.v7.widget.CardView
android:layout_width = "match_parent"
android:layout_height = "wrap_content"
cardView:cardElevation = "2dp"
>
<LinearLayout
android:layout_width = "match_parent"
android:layout_height = "wrap_content"
android:gravity = "center"
android:orientation = "horizontal"
>
<ImageView
android:layout_width = "wrap_content"
android:layout_height = "wrap_content"
android:src="@drawable/ic_back"
android:visibility = "@{ isDeleteToolbar ? View.VISIBLE : View.GONE }"
/>
<TextView
android:id = "@+id/text_toolbar_search"
android:layout_width = "0dp"
android:layout_height = "wrap_content"
android:layout_weight = "1"
android:visibility = "@{ !isDeleteToolbar ? View.VISIBLE : View.GONE }"
/>
<TextView
android:id = "@+id/text_toolbar_search_count"
android:layout_width = "wrap_content"
android:layout_height = "wrap_content"
android:layout_weight = "1"
android:visibility = "@{ isDeleteToolbar ? View.VISIBLE : View.GONE }"
/>
</LinearLayout>
</android.support.v7.widget.CardView>
</android.support.v7.widget.Toolbar>
这是fragment.xml
<android.support.constraint.ConstraintLayout
android:layout_width = "match_parent"
android:layout_height = "match_parent"
>
<include
android:id = "@+id/toolbar"
style = "@style/ConstraintTop"
layout = "@layout/toolbar_search"
android:layout_width = "0dp"
android:layout_height = "wrap_content"
/>
...
</android.support.constraint.ConstraintLayout>
这是片段。 它处理recyclerview的item longclick事件。
adapter.getPublishSubject()
.subscribe(data -> {
binding.toolbar.setIsDeleteToolbar(true);
});
有一个更好的方法吗 ?
最好的解决方案是创建工具栏ActionMode
ActionMode mActionMode;
Menu context_menu;
动作模式:
private ActionMode.Callback mActionModeCallback = new ActionMode.Callback() {
@Override
public boolean onCreateActionMode(ActionMode actionMode, Menu menu) {
// Inflate a menu resource providing context menu items
MenuInflater inflater = actionMode.getMenuInflater();
inflater.inflate(R.menu.muliselect, menu);
context_menu = menu;
return true;
}
@Override
public boolean onPrepareActionMode(ActionMode actionMode, Menu menu) {
return false;
}
@Override
public boolean onActionItemClicked(ActionMode actionMode, MenuItem menuItem) {
switch (menuItem.getItemId()) {
case R.id.action_delete:
return true;
default:
return false;
}
}
@Override
public void onDestroyActionMode(ActionMode actionMode) {
mActionMode = null;
isMultiSelect = false;
selectEmailArrayList = new ArrayList<Email>();
refreshAdapter();
}
};
在ListView LongClick Listener上执行以下操作:
@Override
public void onItemLongClick(View view, int position) {
if (!isMultiSelect) {
selectEmailArrayList = new ArrayList<Email>();
isMultiSelect = true;
if (mActionMode == null) {
mActionMode = startActionMode(mActionModeCallback);
}
}
multi_select(position);
}
如果您已经在reyclerview适配器中实现了“动作”模式,那么当用户长按并进入“动作”模式时,这是设置工具栏颜色的方式:
将此代码放在values-v21 / styles.xml文件中的活动主题内
<item name="actionModeBackground">@color/colorAccent</item>
这里@ color / colorAccent是我希望工具栏颜色更改为的颜色的引用。 在此处放置所需的颜色。
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