我想让我的所有CardView的高度都等于它们的宽度，而且我想让每个CardView占据用户设备屏幕的同一部分。我该怎么做？我的代码是这样的：
<android.support.constraint.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_marginTop="10dp">
<android.support.v7.widget.CardView
android:id="@+id/tool1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginLeft="3dp"
android:layout_marginRight="3dp"
android:foregroundGravity="center"
app:layout_constraintHorizontal_weight="1"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toLeftOf="@id/tool2">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/too_4_background"
android:gravity="center"
android:orientation="vertical"
android:paddingBottom="10dp"
android:paddingTop="10dp">
<LinearLayout
android:layout_width="30dp"
android:layout_height="30dp"
android:background="@drawable/emoji_background"
android:gravity="center">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:text="😳"
android:textSize="15dp" />
</LinearLayout>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="4dp"
android:gravity="center"
android:text="ارسال رایگان"
android:textColor="#ffffff"
android:textSize="13dp" />
</LinearLayout>
</android.support.v7.widget.CardView>
<android.support.v7.widget.CardView
android:id="@+id/tool2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginLeft="3dp"
android:layout_marginRight="3dp"
app:layout_constraintHorizontal_weight="1"
app:layout_constraintLeft_toRightOf="@id/tool1"
app:layout_constraintRight_toLeftOf="@id/tool3">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/too_4_background"
android:gravity="center"
android:orientation="vertical"
android:paddingBottom="10dp"
android:paddingTop="10dp">
<LinearLayout
android:layout_width="30dp"
android:layout_height="30dp"
android:background="@drawable/emoji_background"
android:gravity="center">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:text="😳"
android:textSize="15dp" />
</LinearLayout>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="4dp"
android:gravity="center"
android:text="ارسال رایگان"
android:textColor="#ffffff"
android:textSize="13dp" />
</LinearLayout>
</android.support.v7.widget.CardView>
<android.support.v7.widget.CardView
android:id="@+id/tool3"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginLeft="3dp"
android:layout_marginRight="3dp"
app:layout_constraintHorizontal_weight="1"
app:layout_constraintLeft_toRightOf="@id/tool2"
app:layout_constraintRight_toLeftOf="@id/tool4">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/too_4_background"
android:gravity="center"
android:orientation="vertical"
android:paddingBottom="10dp"
android:paddingTop="10dp">
<LinearLayout
android:layout_width="30dp"
android:layout_height="30dp"
android:background="@drawable/emoji_background"
android:gravity="center">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:text="😳"
android:textSize="15dp" />
</LinearLayout>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="4dp"
android:gravity="center"
android:text="ارسال رایگان"
android:textColor="#ffffff"
android:textSize="13dp" />
</LinearLayout>
</android.support.v7.widget.CardView>
<android.support.v7.widget.CardView
android:id="@+id/tool4"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginLeft="3dp"
android:layout_marginRight="3dp"
app:layout_constraintHorizontal_weight="1"
app:layout_constraintLeft_toRightOf="@id/tool3"
app:layout_constraintRight_toRightOf="parent"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/too_4_background"
android:gravity="center"
android:orientation="vertical"
android:paddingBottom="10dp"
android:paddingTop="10dp">
<LinearLayout
android:layout_width="30dp"
android:layout_height="30dp"
android:background="@drawable/emoji_background"
android:gravity="center">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:text="😳"
android:textSize="15dp" />
</LinearLayout>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="4dp"
android:gravity="center"
android:text="ارسال رایگان"
android:textColor="#ffffff"
android:textSize="13dp" />
</LinearLayout>
</android.support.v7.widget.CardView>
</android.support.constraint.ConstraintLayout>
如果问题是设置相同的高度和宽度，下面是代码。
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.design.card.MaterialCardView
app:layout_constraintDimensionRatio="1:1"
android:layout_width="0dp"
android:layout_height="0dp">
</android.support.design.card.MaterialCardView>
</android.support.constraint.ConstraintLayout>
您需要一个自定义的CardView，比如SquareCardView:
public class SquareCardView extends CardView {
public SquareCardView(Context context) {
super(context);
}
public SquareCardView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public SquareCardView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int size = Math.min(getMeasuredWidth(), getMeasuredHeight());
setMeasuredDimension(size, size);
}
}
然后，在布局中使用自定义卡视图：
<com.yourPackageName.SquareCardView
android:id="@+id/tool1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="3dp"
android:layout_marginRight="3dp"
android:foregroundGravity="center"
app:layout_constraintHorizontal_weight="1"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toLeftOf="@id/tool2">