android - Constraintlayout 的表现不如 recyclerview 的项目
问题描述
我有一个 recyclerview，其项目如下所示：
<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/card_food_item"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="2dp"
android:layout_marginBottom="4dp"
app:cardCornerRadius="4dp">
<LinearLayout
android:id="@+id/linear_food_item"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="start"
android:orientation="horizontal"
android:padding="4dp">
<com.mikhaellopez.circleview.CircleView
android:id="@+id/food_image"
android:layout_width="80dp"
android:layout_height="80dp"
app:cv_color="@color/colorAccent" />
<LinearLayout
android:id="@+id/food_contents"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:orientation="vertical">
<TextView
android:id="@+id/food_title_homepage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="start"
android:fontFamily="@font/sans_regular"
android:text="عنوان غذا"
android:textAppearance="@style/TextAppearance.AppCompat.Title" />
<TextView
android:id="@+id/ingredients_homepage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="start"
android:fontFamily="@font/sans_regular"
android:text="مواد اولیه"
android:textAppearance="@style/TextAppearance.MaterialComponents.Subtitle1" />
</LinearLayout>
</LinearLayout>
</androidx.cardview.widget.CardView>
我正在尝试使用 Constraintlayout 将其转换为平面层次结构。这是它的外观：
<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/card_food_item"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="2dp"
android:layout_marginBottom="4dp"
app:cardCornerRadius="4dp">
<androidx.constraintlayout.widget.ConstraintLayout
android:id="@+id/linear_food_item"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/food_title_homepage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="10dp"
android:layout_marginTop="8dp"
android:text="عنوان غذا"
android:textAppearance="@style/TextAppearance.AppCompat.Title"
app:layout_constraintStart_toEndOf="@+id/food_image"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/ingredients_homepage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="10dp"
android:text="مواد اولیه"
android:textAppearance="@style/TextAppearance.MaterialComponents.Subtitle1"
app:layout_constraintStart_toEndOf="@+id/food_image"
app:layout_constraintTop_toBottomOf="@+id/food_title_homepage" />
<com.mikhaellopez.circleview.CircleView
android:id="@+id/food_image"
android:layout_width="0dp"
android:layout_height="80dp"
android:layout_marginStart="10dp"
android:layout_marginTop="5dp"
android:layout_marginBottom="5dp"
app:cv_color="@color/colorAccent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.cardview.widget.CardView>
这是我的 Recyclerview 插入的位置：
<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/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".main.homepage.HomepageFragment">
<ProgressBar
android:id="@+id/homepage_progressbar"
style="?android:attr/progressBarStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@android:color/transparent"
android:visibility="invisible"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" />
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recipes"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:scrollbars="vertical"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/homepage_toolbar"
tools:listitem="@layout/fragment_homepage_food_item" />
<include
android:id="@+id/homepage_toolbar"
layout="@layout/fragment_homepage_toolbar"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
以下是每个项目的样子：https ://i.stack.imgur.com/AcfAm.png
但我在 Recyclerview 中没有得到相同的结果：https ://i.stack.imgur.com/jpUG4.png
在将视图转换为 Constraintlayout 之前我没有遇到问题！在我转换它们之前，一切都运行良好。他们都在 Recyclerview 中左对齐！！
有谁知道是什么问题？？提前致谢
--更新--
它在 android 模拟器或任何其他设备上的样子：https ://i.stack.imgur.com/tvGz4.png
当我向下滚动到底部时（我在每次滚动后更新列表）一些项目变得右对齐（它们以某种方式得到修复）但其余的保持不变（仍然左对齐）
-- Java 代码--
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getActivity());
viewModel = new ViewModelProvider(this).get(HomepageViewModel.class);
getData(0);
setRecyclerView(linearLayoutManager);
EndlessRecyclerViewScrollListener scrollListener = new EndlessRecyclerViewScrollListener(linearLayoutManager) {
@Override
public void onLoadMore(int page, int totalItemsCount, RecyclerView view) {
getData(page);
}
};
recyclerView.addOnScrollListener(scrollListener);
private void getData(int offset) {
viewModel.init(this, offset);
viewModel.getFoodsLiveData().observe(getViewLifecycleOwner(), foodList -> {
if (foodList != null) {
foods.addAll(foodList);
foodList.clear();
foodAdapter.notifyDataSetChanged();
}
});
}
private void setRecyclerView(LinearLayoutManager linearLayoutManager) {
foodAdapter = new FoodAdapter(foods);
recyclerView.setAdapter(foodAdapter);
recyclerView.setLayoutManager(linearLayoutManager);
}
我的适配器：
private void getData(int offset) {
viewModel.init(this, offset);
viewModel.getFoodsLiveData().observe(getViewLifecycleOwner(), foodList -> {
if (foodList != null) {
foods.addAll(foodList);
foodList.clear();
foodAdapter.notifyDataSetChanged();
}
});
}
private void setRecyclerView(LinearLayoutManager linearLayoutManager) {
foodAdapter = new FoodAdapter(foods);
recyclerView.setAdapter(foodAdapter);
recyclerView.setLayoutManager(linearLayoutManager);
}
My adapter:
private List<Food> foods;
FoodAdapter(List<Food> foods) {
this.foods = foods;
}
static class FoodViewHolder extends RecyclerView.ViewHolder {
CircleView foodImage;
TextView foodTitle, ingredients;
CardView foodItem;
FoodViewHolder(View itemView) {
super(itemView);
foodImage = itemView.findViewById(R.id.food_image);
foodTitle = itemView.findViewById(R.id.food_title_homepage);
ingredients = itemView.findViewById(R.id.ingredients_homepage);
foodItem = itemView.findViewById(R.id.card_food_item);
}
}
@NonNull
@Override
public FoodViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.fragment_homepage_food_item, parent, false);
return new FoodViewHolder(v);
}
@Override
public void onBindViewHolder(@NonNull FoodViewHolder holder, int position) {
final Food currentFood = foods.get(position);
StringBuilder food_ingredient_str = new StringBuilder();
int ingredient_position = 0;
int ingredients_size = currentFood.getFood_ingredients().size();
for (Food.FoodIngredient foodIngredient : currentFood.getFood_ingredients()) {
food_ingredient_str.append(foodIngredient.getIngredient());
if (ingredient_position != ingredients_size / 3)
food_ingredient_str.append(", ");
if (ingredient_position == ingredients_size / 3) {
food_ingredient_str.append(" و ...");
break;
}
ingredient_position += 1;
}
holder.foodTitle.setText(currentFood.getName());
holder.ingredients.setText(food_ingredient_str);
holder.foodItem.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Bundle bundle = new Bundle();
bundle.putSerializable("current_food", currentFood);
Navigation.findNavController(v).navigate(R.id.action_navigation_home_to_navigation_food, bundle);
}
});
}
@Override
public int getItemCount() {
return foods.size();
}
解决方案
如果您想使用 recyclerview 创建一个列表，并且每个项目都像阿拉伯语一样右对齐..然后尝试这些方法
用这个替换你的“recycle_view_item_layout.xml”
<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/card_food_item"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="2dp"
android:layout_marginBottom="4dp"
app:cardCornerRadius="4dp">
<LinearLayout
android:id="@+id/linear_food_item"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:padding="4dp">
<LinearLayout
android:id="@+id/food_contents"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:layout_weight="1"
android:orientation="vertical">
<TextView
android:id="@+id/food_title_homepage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="end"
android:ellipsize="start"
android:fontFamily="@font/sans_regular"
android:singleLine="true"
android:text="عنوان غذا"
android:textAppearance="@style/TextAppearance.AppCompat.Title" />
<TextView
android:id="@+id/ingredients_homepage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="end"
android:ellipsize="start"
android:fontFamily="@font/sans_regular"
android:singleLine="true"
android:text="مواد اولیه"
android:textAppearance="@style/TextAppearance.MaterialComponents.Subtitle1" />
</LinearLayout>
<com.mikhaellopez.circleview.CircleView
android:id="@+id/food_image"
android:layout_width="80dp"
android:layout_height="80dp"
app:cv_color="@color/colorAccent" />
</LinearLayout>
</androidx.cardview.widget.CardView>
用这个替换你的“回收视图”
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recipes"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="vertical"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintTop_toBottomOf="@id/homepage_toolbar"
tools:listitem="@layout/fragment_homepage_food_item" />
并附上这样的布局管理器（重要）
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getContext(), LinearLayoutManager.VERTICAL, false);
setRecyclerView(layoutManager);
你的其余代码似乎还可以
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