RecyclerView 项目不填充宽度
RecyclerView items don't fill width
我设计了一个带有地图片段和recyclerView 的布局。
每个 recyclerView 项目都是 cardview（我指定了 xml 布局）。
问题是 RecyclerView 项目没有填满屏幕宽度。
img here
我试过把layout_width改成fill_parent，match_parent……但是没用
这是每个项目的布局
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="8dp"
android:id="@+id/cardView">
<LinearLayout
android:id="@+id/locationItemView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<ImageView
android:layout_width="120px"
android:layout_height="120px"
android:id="@+id/imgIcon"
android:background="@drawable/image_bg"
android:layout_margin="5dp"
android:scaleType="fitCenter"
android:adjustViewBounds="true" />
<LinearLayout
android:id="@+id/layoutInfo"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<TextView
android:id="@+id/txtName"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Location Name"
android:textColor="#d5c645"
android:textStyle="bold"
android:textSize="20dp"
android:padding="3dp" />
<TextView
android:id="@+id/txtAddress"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Location Address"
android:textSize="16dp"
android:padding="3dp" />
<TextView
android:id="@+id/txtDistance"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:text="Location Distance"
android:textSize="14dp"
android:textStyle="italic"
android:padding="2dp"
android:textAlignment="viewEnd" />
</LinearLayout>
</LinearLayout>
</android.support.v7.widget.CardView>
和main_layout
<android.support.v4.widget.DrawerLayout
android:id="@+id/drawer_layout"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:map="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent"
android:layout_height="0px" android:id="@+id/map" tools:context=".Main"
android:name="com.google.android.gms.maps.SupportMapFragment"
android:layout_weight=".6"/>
<android.support.v7.widget.RecyclerView
android:id="@+id/locationList"
android:layout_width="match_parent"
android:layout_height="0px"
android:layout_weight=".4"
android:divider="#FEFFCC"
android:dividerHeight="1dp" />
</LinearLayout>
<ListView
android:id="@+id/navdrawer"
android:layout_width="250px"
android:layout_height="match_parent"
android:layout_gravity="start"
android:background="?attr/colorPrimaryDark"
android:choiceMode="singleChoice"
android:divider="@android:color/white"
android:dividerHeight="1dp"
android:drawSelectorOnTop="false"/>
</android.support.v4.widget.DrawerLayout>
希望有人能帮助我。我坚持了3天。
谢谢。
====================================
编辑于 2015 年 11 月 19 日
我不认为问题出在我的 itemView 布局上，因为当我将它更改为 GridLayout 时，它仍然没有填满宽度。
这是我的 RecyclerView
自定义适配器
public class LocationDetailsAdapter extends RecyclerView.Adapter<LocationDetailsViewHolder> {
Context _context;
ArrayList<LocationDetails> _data;
public LocationDetailsAdapter(Context _context, ArrayList<LocationDetails> _object) {
this._context = _context;
_data = _object;
}
@Override
public LocationDetailsViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View _v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.list_location,null );
LocationDetailsViewHolder _viewHolder = new LocationDetailsViewHolder(_v);
return _viewHolder;
}
@Override
public void onBindViewHolder(LocationDetailsViewHolder locationDetailsViewHolder, int i) {
LocationDetails _location = _data.get(i);
locationDetailsViewHolder._imgType.setImageResource(R.drawable.repair_img);
locationDetailsViewHolder._locationName.setText(_location.get_locationName());
locationDetailsViewHolder._locationAddress.setText(_location.get_locationAddress() + ", " + _location.get_district() + ", " + _location.get_province());
locationDetailsViewHolder._distance.setText(String.valueOf(_location.get_distance()) + " km");
locationDetailsViewHolder._locationName.setOnClickListener(clickListener);
locationDetailsViewHolder._imgType.setOnClickListener(clickListener);
locationDetailsViewHolder._locationAddress.setOnClickListener(clickListener);
locationDetailsViewHolder._locationName.setTag(locationDetailsViewHolder);
locationDetailsViewHolder._imgType.setTag(locationDetailsViewHolder);
locationDetailsViewHolder._locationAddress.setTag(locationDetailsViewHolder);
}
@Override
public int getItemCount() {
return (null != _data ? _data.size() : 0);
}
View.OnClickListener clickListener = new View.OnClickListener() {
@Override
public void onClick(View v) {
LocationDetailsViewHolder _holder = (LocationDetailsViewHolder)v.getTag();
int _pos = _holder.getPosition();
int _id = _data.get(_pos).get_id();
Intent _intent = new Intent(CommonFields._context, ItemView.class);
_intent.putExtra("LocationID",_id);
_intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
CommonFields._context.startActivity(_intent);
}
};
}
这里我在 main
中得到了 RecylerView
_locationView = (RecyclerView)findViewById(R.id.locationList);
_locationView.setLayoutManager(new LinearLayoutManager(this));
_adapter = new LocationDetailsAdapter(Main.this, CommonFields._locationData);
_locationView.setAdapter(_adapter);
你应该像这样创建View
@Override
public CardViewDataAdapter.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
// create a new view
View itemLayoutView = LayoutInflater.from(viewGroup.getContext()).inflate(
R.layout.card_view, viewGroup, false);
// create ViewHolder
ViewHolder viewHolder = new ViewHolder(itemLayoutView);
return viewHolder;
}
从 LayoutInflater 扩充 View 时，您需要传递父参数才能使用 layout_* 属性。那是因为这些属性需要创建正确的 LayoutParams class。这意味着您不能使用 inflate(R.layout.*, null)，而必须为第二个参数传递 ViewGroup。在大多数情况下，您还希望使用该方法的三参数版本并将 false 作为第三个参数传递。如果省略或 true 则 View 会立即添加到父级，这会导致 onCreateViewHolder() 等地方出现问题，因为框架设计为稍后执行此操作。有关详细信息，请参阅 this answer。
在你的例子中，你有行
View _v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.list_location,null );
你应该把它改成
View _v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.list_location, viewGroup, false );
也许我的回答有不同的方法，但它可以占据整个屏幕的宽度，并且在通过回收视图时不会破坏元素。
Adapter adapterBalanceInquiry = new Adapter(getActivity(), list);
recyclerView.setHasFixedSize(true);
recyclerView.setNestedScrollingEnabled(false);
recyclerView.setAdapter(adapterBalanceInquiry);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity(), RecyclerView.HORIZONTAL, false));
recyclerView.post(new Runnable() {
@Override
public void run() {
try {
int dx = (recyclerView.getWidth() - recyclerView.getChildAt(0).getWidth());
recyclerView.scrollBy(-dx, 0);
LinearSnapHelper snapHelper = new LinearSnapHelper();
recyclerView.setOnFlingListener(null);
snapHelper.attachToRecyclerView(recyclerView);
}catch (Exception e){
e.printStackTrace();
}
}
});
我设计了一个带有地图片段和recyclerView 的布局。 每个 recyclerView 项目都是 cardview（我指定了 xml 布局）。
问题是 RecyclerView 项目没有填满屏幕宽度。 img here
我试过把layout_width改成fill_parent，match_parent……但是没用
这是每个项目的布局
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="8dp"
android:id="@+id/cardView">
<LinearLayout
android:id="@+id/locationItemView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<ImageView
android:layout_width="120px"
android:layout_height="120px"
android:id="@+id/imgIcon"
android:background="@drawable/image_bg"
android:layout_margin="5dp"
android:scaleType="fitCenter"
android:adjustViewBounds="true" />
<LinearLayout
android:id="@+id/layoutInfo"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<TextView
android:id="@+id/txtName"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Location Name"
android:textColor="#d5c645"
android:textStyle="bold"
android:textSize="20dp"
android:padding="3dp" />
<TextView
android:id="@+id/txtAddress"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Location Address"
android:textSize="16dp"
android:padding="3dp" />
<TextView
android:id="@+id/txtDistance"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:text="Location Distance"
android:textSize="14dp"
android:textStyle="italic"
android:padding="2dp"
android:textAlignment="viewEnd" />
</LinearLayout>
</LinearLayout>
</android.support.v7.widget.CardView>
和main_layout
<android.support.v4.widget.DrawerLayout
android:id="@+id/drawer_layout"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:map="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent"
android:layout_height="0px" android:id="@+id/map" tools:context=".Main"
android:name="com.google.android.gms.maps.SupportMapFragment"
android:layout_weight=".6"/>
<android.support.v7.widget.RecyclerView
android:id="@+id/locationList"
android:layout_width="match_parent"
android:layout_height="0px"
android:layout_weight=".4"
android:divider="#FEFFCC"
android:dividerHeight="1dp" />
</LinearLayout>
<ListView
android:id="@+id/navdrawer"
android:layout_width="250px"
android:layout_height="match_parent"
android:layout_gravity="start"
android:background="?attr/colorPrimaryDark"
android:choiceMode="singleChoice"
android:divider="@android:color/white"
android:dividerHeight="1dp"
android:drawSelectorOnTop="false"/>
</android.support.v4.widget.DrawerLayout>
希望有人能帮助我。我坚持了3天。 谢谢。
==================================== 编辑于 2015 年 11 月 19 日 我不认为问题出在我的 itemView 布局上，因为当我将它更改为 GridLayout 时，它仍然没有填满宽度。 这是我的 RecyclerView
自定义适配器public class LocationDetailsAdapter extends RecyclerView.Adapter<LocationDetailsViewHolder> {
Context _context;
ArrayList<LocationDetails> _data;
public LocationDetailsAdapter(Context _context, ArrayList<LocationDetails> _object) {
this._context = _context;
_data = _object;
}
@Override
public LocationDetailsViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View _v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.list_location,null );
LocationDetailsViewHolder _viewHolder = new LocationDetailsViewHolder(_v);
return _viewHolder;
}
@Override
public void onBindViewHolder(LocationDetailsViewHolder locationDetailsViewHolder, int i) {
LocationDetails _location = _data.get(i);
locationDetailsViewHolder._imgType.setImageResource(R.drawable.repair_img);
locationDetailsViewHolder._locationName.setText(_location.get_locationName());
locationDetailsViewHolder._locationAddress.setText(_location.get_locationAddress() + ", " + _location.get_district() + ", " + _location.get_province());
locationDetailsViewHolder._distance.setText(String.valueOf(_location.get_distance()) + " km");
locationDetailsViewHolder._locationName.setOnClickListener(clickListener);
locationDetailsViewHolder._imgType.setOnClickListener(clickListener);
locationDetailsViewHolder._locationAddress.setOnClickListener(clickListener);
locationDetailsViewHolder._locationName.setTag(locationDetailsViewHolder);
locationDetailsViewHolder._imgType.setTag(locationDetailsViewHolder);
locationDetailsViewHolder._locationAddress.setTag(locationDetailsViewHolder);
}
@Override
public int getItemCount() {
return (null != _data ? _data.size() : 0);
}
View.OnClickListener clickListener = new View.OnClickListener() {
@Override
public void onClick(View v) {
LocationDetailsViewHolder _holder = (LocationDetailsViewHolder)v.getTag();
int _pos = _holder.getPosition();
int _id = _data.get(_pos).get_id();
Intent _intent = new Intent(CommonFields._context, ItemView.class);
_intent.putExtra("LocationID",_id);
_intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
CommonFields._context.startActivity(_intent);
}
};
}
这里我在 main
中得到了 RecylerView_locationView = (RecyclerView)findViewById(R.id.locationList);
_locationView.setLayoutManager(new LinearLayoutManager(this));
_adapter = new LocationDetailsAdapter(Main.this, CommonFields._locationData);
_locationView.setAdapter(_adapter);
你应该像这样创建View
@Override
public CardViewDataAdapter.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
// create a new view
View itemLayoutView = LayoutInflater.from(viewGroup.getContext()).inflate(
R.layout.card_view, viewGroup, false);
// create ViewHolder
ViewHolder viewHolder = new ViewHolder(itemLayoutView);
return viewHolder;
}
从 LayoutInflater 扩充 View 时，您需要传递父参数才能使用 layout_* 属性。那是因为这些属性需要创建正确的 LayoutParams class。这意味着您不能使用 inflate(R.layout.*, null)，而必须为第二个参数传递 ViewGroup。在大多数情况下，您还希望使用该方法的三参数版本并将 false 作为第三个参数传递。如果省略或 true 则 View 会立即添加到父级，这会导致 onCreateViewHolder() 等地方出现问题，因为框架设计为稍后执行此操作。有关详细信息，请参阅 this answer。
在你的例子中，你有行
View _v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.list_location,null );
你应该把它改成
View _v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.list_location, viewGroup, false );
也许我的回答有不同的方法，但它可以占据整个屏幕的宽度，并且在通过回收视图时不会破坏元素。
Adapter adapterBalanceInquiry = new Adapter(getActivity(), list);
recyclerView.setHasFixedSize(true);
recyclerView.setNestedScrollingEnabled(false);
recyclerView.setAdapter(adapterBalanceInquiry);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity(), RecyclerView.HORIZONTAL, false));
recyclerView.post(new Runnable() {
@Override
public void run() {
try {
int dx = (recyclerView.getWidth() - recyclerView.getChildAt(0).getWidth());
recyclerView.scrollBy(-dx, 0);
LinearSnapHelper snapHelper = new LinearSnapHelper();
recyclerView.setOnFlingListener(null);
snapHelper.attachToRecyclerView(recyclerView);
}catch (Exception e){
e.printStackTrace();
}
}
});