我是android开发的新手我做了一个recyclerview但是我在使用RecyclerView时有问题,一个项目没有占据屏幕的全宽我不知道是什么问题 这是问题的屏幕截图
这里是mainActivity.xml mainActivity.xml是包含recyclerview
的布局<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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:layout_width="match_parent"
android:layout_height="match_parent"
android:alpha = "0.8"
tools:context="com.example.abdelmagied.bakingapp.MainActivity">
<android.support.v7.widget.RecyclerView
android:id="@+id/recyclerId"
android:layout_width="368dp"
android:layout_height="495dp"
tools:layout_editor_absoluteY="16dp"
android:layout_marginRight="8dp"
app:layout_constraintRight_toRightOf="parent" />
</android.support.constraint.ConstraintLayout>
这里是recyclerItem.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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:layout_width="match_parent"
android:layout_height="122dp"
android:background="#999999"
android:orientation="vertical">
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="88dp"
android:layout_marginLeft="16dp"
android:layout_marginTop="8dp"
android:fontFamily="sans-serif"
android:textColor = "#070707"
android:text="Name"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.888" />
<TextView
android:id="@+id/name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginLeft="57dp"
android:textSize = "25dp"
android:layout_marginTop="8dp"
android:text="Nuttella Pie"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toRightOf="@+id/textView"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.089" />
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginLeft="16dp"
android:layout_marginTop="8dp"
android:text="Servings"
android:fontFamily="sans-serif"
android:textColor = "#070707"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView"
app:layout_constraintVertical_bias="0.49" />
<TextView
android:id="@+id/servings"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="16dp"
android:textSize = "25dp"
android:layout_marginLeft="74dp"
android:text="8"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toRightOf="@+id/textView3"
/>
<ImageView
android:id="@+id/imageView"
android:layout_width="204dp"
android:layout_height="107dp"
app:srcCompat="@drawable/chef"
tools:layout_editor_absoluteY="8dp"
android:layout_marginLeft="200dp"
app:layout_constraintLeft_toLeftOf="parent" />
</android.support.constraint.ConstraintLayout>
答案 0 :(得分:2)
不要将指定的dp用于layout_height
和layout_width
。您必须将recyclerview的宽度设置为match_parent
<android.support.v7.widget.RecyclerView
android:id="@+id/recyclerId"
android:layout_width="match_parent" //This line
android:layout_height="495dp"
tools:layout_editor_absoluteY="16dp"
android:layout_marginRight="8dp" //Also remove this line...
app:layout_constraintRight_toRightOf="parent" />
答案 1 :(得分:0)
固定措施是一个糟糕的实践。 在您的主要活动中,请更改为:
<android.support.v7.widget.RecyclerView
android:id="@+id/recyclerId"
android:layout_width="match_parent" <!--THIS LINE-->
android:layout_height="match_parent"<!--THIS LINE or wrap_content-->
tools:layout_editor_absoluteY="16dp"
android:layout_marginRight="0dp"<!--why it was 8? obviously it wont work-->
app:layout_constraintRight_toRightOf="parent" />