如何制作方形CardView(Android)

时间:2018-07-20 07:27:14

标签: android android-cardview

如何制作CardView正方形。

当我在layout_weight上设置CardView时,它并没有像CardView上的正方形一样设置。

请给我一个解决方案:(不设置固定的高度和宽度)

请参见下图: enter image description here

代码:

<LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:layout_weight="2"
                    android:weightSum="3">

                    <android.support.v7.widget.CardView
                        android:layout_width="0dp"
                        android:layout_height="match_parent"
                        android:layout_margin="4dp"
                        android:layout_weight="2"
                        app:cardBackgroundColor="@color/silver"
                        tools:ignore="NestedWeights">


                    </android.support.v7.widget.CardView>

                    <LinearLayout
                        android:layout_width="0dp"
                        android:layout_height="match_parent"
                        android:layout_weight="1"
                        android:orientation="vertical"
                        android:weightSum="1">

                        <android.support.v7.widget.CardView
                            android:layout_width="match_parent"
                            android:layout_height="match_parent"
                            android:layout_margin="4dp"
                            android:layout_weight="0.5"
                            app:cardBackgroundColor="@color/silver">


                        </android.support.v7.widget.CardView>

                        <android.support.v7.widget.CardView
                            android:layout_width="match_parent"
                            android:layout_height="match_parent"
                            android:layout_margin="4dp"
                            android:layout_weight="0.5"
                            app:cardBackgroundColor="@color/silver">


                        </android.support.v7.widget.CardView>

                    </LinearLayout>

                </LinearLayout>

2 个答案:

答案 0 :(得分:6)

您可以使用ConstraintLayout代替权重的多个LinearLayout

添加

implementation 'com.android.support.constraint:constraint-layout:1.1.2'
在您的build.gradle

。然后您可以尝试类似的操作(将DimensionRatio设置为1):

<?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"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="4dp">

<android.support.v7.widget.CardView
    android:id="@+id/card1"
    android:layout_width="0dp"
    android:layout_height="0dp"
    app:layout_constraintDimensionRatio="1"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent">

    <ImageView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:src="@drawable/no_picture" />
</android.support.v7.widget.CardView>

<android.support.v7.widget.CardView
    android:id="@+id/card2"
    android:layout_width="0dp"
    android:layout_height="0dp"
    android:layout_marginStart="4dp"
    app:layout_constraintBottom_toTopOf="@id/card3"
    app:layout_constraintDimensionRatio="1"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toEndOf="@id/card1"
    app:layout_constraintTop_toTopOf="@id/card1">

    <ImageView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:src="@drawable/no_picture" />
</android.support.v7.widget.CardView>


<android.support.v7.widget.CardView
    android:id="@+id/card3"
    android:layout_width="0dp"
    android:layout_height="0dp"
    android:layout_marginTop="4dp"
    app:layout_constraintBottom_toBottomOf="@id/card1"
    app:layout_constraintDimensionRatio="1"
    app:layout_constraintEnd_toEndOf="@id/card2"
    app:layout_constraintStart_toStartOf="@id/card2"
    app:layout_constraintTop_toBottomOf="@id/card2">

    <ImageView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:src="@drawable/no_picture" />
</android.support.v7.widget.CardView>

</android.support.constraint.ConstraintLayout>

结果:

enter image description here

答案 1 :(得分:0)

您可以使用自定义CardView,并覆盖onMeasure()以强制采用1:1的宽高比

public class SquareCardView extends CardView {

    public SquareCardView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int ignoredHeightMeasureSpec) {
        int newHeightMeasureSpec = widthMeasureSpec;
        super.onMeasure(widthMeasureSpec, newHeightMeasureSpec);
    }

}

然后在您的xml中使用此代码

<com.example.view.SquareCardView
  android:layout_width="0dp"
  android:layout_height="wrap_content"
  android:layout_weight="1">
  <ImageView
    android:src="@drawable/square1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/main_dark"
    android:adjustViewBounds="true" />
</com.example.view.SquareCardView>