我需要在Android应用程序中实现水平列表视图。我做了一些研究并遇到了How can I make a horizontal ListView in Android?和Horizontal ListView in Android?但是,在Recyclerview发布之前就提出了这些问题。现在使用Recyclerview有更好的方法来实现吗?
答案 0 :(得分:630)
现在使用Recyclerview有更好的方法来实现吗?
是
使用RecyclerView
时,您需要指定负责在视图中布置每个项目的LayoutManager
。 LinearLayoutManager
允许您指定方向,就像普通的LinearLayout
一样。
要创建包含RecyclerView
的水平列表,您可以执行以下操作:
LinearLayoutManager layoutManager
= new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false);
RecyclerView myList = (RecyclerView) findViewById(R.id.my_recycler_view);
myList.setLayoutManager(layoutManager);
答案 1 :(得分:138)
<android.support.v7.widget.RecyclerView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layoutManager="android.support.v7.widget.LinearLayoutManager" />
答案 2 :(得分:61)
纵向RecyclerView
和横向LinearLayoutManager
之间的唯一真正区别在于您设置LinearLayoutManager horizontalLayoutManagaer = new LinearLayoutManager(MainActivity.this, LinearLayoutManager.HORIZONTAL, false);
recyclerView.setLayoutManager(horizontalLayoutManagaer);
的方式。这是代码片段。完整的例子如下。
gradle.build
这个更全面的例子是在my vertical RecyclerView
answer之后建模的。
确保您的应用implementation 'com.android.support:appcompat-v7:27.1.1'
implementation 'com.android.support:recyclerview-v7:27.1.1'
文件中包含以下依赖项:
RecyclerView
您可以将版本号更新为the most current。
将<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:id="@+id/rvAnimals"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</RelativeLayout>
添加到xml布局。
activity_main.xml中
RecyclerView
View
中的每个项目都会在TextView
上有一个彩色<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="10dp">
<View
android:id="@+id/colorView"
android:layout_width="100dp"
android:layout_height="100dp"/>
<TextView
android:id="@+id/tvAnimalName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20sp"/>
</LinearLayout>
。创建一个新的布局资源文件。
recyclerview_item.xml
RecyclerView
public class MyRecyclerViewAdapter extends RecyclerView.Adapter<MyRecyclerViewAdapter.ViewHolder> {
private List<Integer> mViewColors;
private List<String> mAnimals;
private LayoutInflater mInflater;
private ItemClickListener mClickListener;
// data is passed into the constructor
MyRecyclerViewAdapter(Context context, List<Integer> colors, List<String> animals) {
this.mInflater = LayoutInflater.from(context);
this.mViewColors = colors;
this.mAnimals = animals;
}
// inflates the row layout from xml when needed
@Override
@NonNull
public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = mInflater.inflate(R.layout.recyclerview_item, parent, false);
return new ViewHolder(view);
}
// binds the data to the view and textview in each row
@Override
public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
int color = mViewColors.get(position);
String animal = mAnimals.get(position);
holder.myView.setBackgroundColor(color);
holder.myTextView.setText(animal);
}
// total number of rows
@Override
public int getItemCount() {
return mAnimals.size();
}
// stores and recycles views as they are scrolled off screen
public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
View myView;
TextView myTextView;
ViewHolder(View itemView) {
super(itemView);
myView = itemView.findViewById(R.id.colorView);
myTextView = itemView.findViewById(R.id.tvAnimalName);
itemView.setOnClickListener(this);
}
@Override
public void onClick(View view) {
if (mClickListener != null) mClickListener.onItemClick(view, getAdapterPosition());
}
}
// convenience method for getting data at click position
public String getItem(int id) {
return mAnimals.get(id);
}
// allows clicks events to be caught
public void setClickListener(ItemClickListener itemClickListener) {
this.mClickListener = itemClickListener;
}
// parent activity will implement this method to respond to click events
public interface ItemClickListener {
void onItemClick(View view, int position);
}
}
需要一个适配器来填充每行(水平项)中的视图和您的数据。创建一个新的java文件。
MyRecyclerViewAdapter.java
ListViews
注释
public class MainActivity extends AppCompatActivity implements MyRecyclerViewAdapter.ItemClickListener {
private MyRecyclerViewAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// data to populate the RecyclerView with
ArrayList<Integer> viewColors = new ArrayList<>();
viewColors.add(Color.BLUE);
viewColors.add(Color.YELLOW);
viewColors.add(Color.MAGENTA);
viewColors.add(Color.RED);
viewColors.add(Color.BLACK);
ArrayList<String> animalNames = new ArrayList<>();
animalNames.add("Horse");
animalNames.add("Cow");
animalNames.add("Camel");
animalNames.add("Sheep");
animalNames.add("Goat");
// set up the RecyclerView
RecyclerView recyclerView = findViewById(R.id.rvAnimals);
LinearLayoutManager horizontalLayoutManager
= new LinearLayoutManager(MainActivity.this, LinearLayoutManager.HORIZONTAL, false);
recyclerView.setLayoutManager(horizontalLayoutManager);
adapter = new MyRecyclerViewAdapter(this, viewColors, animalNames);
adapter.setClickListener(this);
recyclerView.setAdapter(adapter);
}
@Override
public void onItemClick(View view, int position) {
Toast.makeText(this, "You clicked " + adapter.getItem(position) + " on item position " + position, Toast.LENGTH_SHORT).show();
}
}
中可用,并且是常见的需求。如果您不需要,可以删除此代码。将以下代码添加到您的主要活动中。
MainActivity.java
ItemClickListener
注释
onItemClick
。这允许我们处理{{1}}。就是这样。您现在应该可以运行项目并获得与顶部图像类似的内容。
答案 3 :(得分:11)
如果您想将RecyclerView
与GridLayoutManager
一起使用,这是实现水平滚动的方法。
recyclerView.setLayoutManager(
new GridLayoutManager(recyclerView.getContext(), rows, GridLayoutManager.HORIZONTAL, false));
答案 4 :(得分:9)
尝试构建水平ListView需要花费太多时间。我已经用两种方式解决了这个问题。
1.使用ViewPager,其适配器从PagerAdapter扩展。
2.通过如上所述使用RecyclerView。需要应用LayoutManager,如下面的代码所示:
LinearLayoutManager layoutManager
= new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false);
RecyclerView myList = (RecyclerView) findViewById(R.id.my_recycler_view);
myList.setLayoutManager(layoutManager);
答案 5 :(得分:6)
如果您希望使用Horizontal Recycler View作为ViewPager,那么现在可以在支持库版本24.2.0中添加LinearSnapHelper
的帮助。
首先将RecyclerView添加到您的活动/片段
<android.support.v7.widget.RecyclerView
android:layout_below="@+id/sign_in_button"
android:layout_width="match_parent"
android:orientation="horizontal"
android:id="@+id/blog_list"
android:layout_height="match_parent">
</android.support.v7.widget.RecyclerView>
就我而言,我在CardView
RecyclerView
<强> blog_row.xml 强>
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_margin="15dp"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical">
<com.android.volley.toolbox.NetworkImageView
android:id="@+id/imageBlogPost"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:adjustViewBounds="true"
android:paddingBottom="15dp"
android:src="@drawable/common_google_signin_btn_text_light_normal" />
<TextView
android:id="@+id/TitleTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="20dp"
android:text="Post Title Here"
android:textSize="16sp" />
<TextView
android:id="@+id/descriptionTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Post Description Here"
android:paddingBottom="15dp"
android:textSize="14sp" />
</LinearLayout>
</android.support.v7.widget.CardView>
在您的活动/片段
中 private RecyclerView mBlogList;
LinearLayoutManager layoutManager
= new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false);
mBlogList = (RecyclerView) findViewById(R.id.blog_list);
mBlogList.setHasFixedSize(true);
mBlogList.setLayoutManager(layoutManager);
LinearSnapHelper snapHelper = new LinearSnapHelper() {
@Override
public int findTargetSnapPosition(RecyclerView.LayoutManager lm, int velocityX, int velocityY) {
View centerView = findSnapView(lm);
if (centerView == null)
return RecyclerView.NO_POSITION;
int position = lm.getPosition(centerView);
int targetPosition = -1;
if (lm.canScrollHorizontally()) {
if (velocityX < 0) {
targetPosition = position - 1;
} else {
targetPosition = position + 1;
}
}
if (lm.canScrollVertically()) {
if (velocityY < 0) {
targetPosition = position - 1;
} else {
targetPosition = position + 1;
}
}
final int firstItem = 0;
final int lastItem = lm.getItemCount() - 1;
targetPosition = Math.min(lastItem, Math.max(targetPosition, firstItem));
return targetPosition;
}
};
snapHelper.attachToRecyclerView(mBlogList);
最后一步是将适配器设置为RecyclerView
mBlogList.setAdapter(firebaseRecyclerAdapter);
答案 6 :(得分:4)
随着RecyclerView库的发布,现在您可以轻松地将图像列表与文本对齐。您可以使用LinearLayoutManager指定列表方向,垂直或水平,如下所示。
您可以下载完整的working demo from this post
答案 7 :(得分:2)
<HorizontalScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
<android.support.v7.widget.RecyclerView
android:id="@+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal"
android:scrollbars="vertical|horizontal" />
</HorizontalScrollView>
答案 8 :(得分:2)
recyclerView.setLayoutManager(new LinearLayoutManager(this,LinearLayoutManager.HORIZONTAL,false));
recyclerView.setAdapter(adapter);
答案 9 :(得分:1)
有一个名为HorizontalGridView的RecyclerView子类,您可以使用它来获得水平方向。 垂直方向VerticalGridView
答案 10 :(得分:1)
水平动态中的回收站视图。
回收者视图实现
RecyclerView musicList = findViewById(R.id.MusicList);
// RecyclerView musiclist = findViewById(R.id.MusicList1);
// RecyclerView musicLIST = findViewById(R.id.MusicList2);
LinearLayoutManager layoutManager = new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false);
musicList.setLayoutManager(layoutManager);
String[] names = {"RAP", "CH SHB", "Faheem", "Anum", "Shoaib", "Laiba", "Zoki", "Komal", "Sultan","Mansoob Gull"};
musicList.setAdapter(new ProgrammingAdapter(names));'
用于回收站视图的适配器类,其中有一个用于保存该回收站视图的视图支架。
public class ProgrammingAdapter
extendsRecyclerView.Adapter<ProgrammingAdapter.programmingViewHolder> {
private String[] data;
public ProgrammingAdapter(String[] data)
{
this.data = data;
}
@Override
public programmingViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
View view = inflater.inflate(R.layout.list_item_layout, parent, false);
return new programmingViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull programmingViewHolder holder, int position) {
String title = data[position];
holder.textV.setText(title);
}
@Override
public int getItemCount() {
return data.length;
}
public class programmingViewHolder extends RecyclerView.ViewHolder{
ImageView img;
TextView textV;
public programmingViewHolder(View itemView) {
super(itemView);
img = itemView.findViewById(R.id.img);
textV = itemView.findViewById(R.id.textt);
}
}
答案 11 :(得分:0)
尝试一下:
myrecyclerview.setLayoutManager(
new LinearLayoutManager(getActivity(),
LinearLayoutManager.HORIZONTAL,false));
myrecyclerview.setAdapter(recyclerAdapter);
仅当您获得带有某些碎片的回收站视图时。
答案 12 :(得分:0)
水平和垂直都适用。
RecyclerView recyclerView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_test_recycler);
recyclerView = (RecyclerView)findViewById(R.id.recyclerViewId);
RecyclAdapter adapter = new RecyclAdapter();
//Vertical RecyclerView
RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getApplicationContext());
recyclerView.setLayoutManager(mLayoutManager);
//Horizontal RecyclerView
//recyclerView.setLayoutManager(new LinearLayoutManager(getApplicationContext(),LinearLayoutManager.HORIZONTAL,false));
recyclerView.setAdapter(adapter);
}