Android 基于文本的RecyclerView中CardView的动态行高

我希望制作一个基于文本内容动态调整自身大小的CardView（即，当文本对于某些屏幕来说太长并且需要多行时）

所需（这是通过将

行

属性修改为2实现的）：

但是，在测试和预览中，都会发生以下情况： "

我不确定解决这个问题的可能方法是什么。必须以编程方式设置

行

属性，还是我的XML布局有问题，或者RecyclerView的某些设置有问题？我的RecyclerView使用简单的

LinearLayoutManager

作为其布局管理器

CardView的XML如下所示：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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="wrap_content">

<android.support.v7.widget.CardView
    android:id="@+id/cv_uav"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:cardCornerRadius="2dp"
    app:cardElevation="2dp"
    app:cardUseCompatPadding="true"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.0"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent">

    <android.support.constraint.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <ImageView
            android:id="@+id/imageView3"
            android:layout_width="40dp"
            android:layout_height="40dp"
            android:layout_marginStart="16dp"
            android:layout_marginTop="16dp"
            android:tint="#4b4b4b"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:srcCompat="@drawable/ic_menu_quadcopter" />

        <TextView
            android:id="@+id/uav_message"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginEnd="16dp"
            android:layout_marginStart="16dp"

            android:layout_marginTop="16dp"
            android:singleLine="false"
            android:text="Telemedicine Drone Approaching!"
            android:textAppearance="@style/TextAppearance.AppCompat.Medium"
            app:layout_constraintBottom_toTopOf="@+id/textView4"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toEndOf="@+id/imageView3"
            app:layout_constraintTop_toTopOf="parent" />

        <TextClock
            android:id="@+id/uav_eta"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="16dp"
            android:layout_marginStart="8dp"
            android:format24Hour="mm:ss"
            android:text="00:23"
            android:textAppearance="@style/TextAppearance.AppCompat.Large"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintStart_toEndOf="@+id/textView4" />

        <TextView
            android:id="@+id/textView4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="16dp"
            android:layout_marginStart="16dp"
            android:text="ETA:"
            android:textAppearance="@android:style/TextAppearance.Material.Large"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintStart_toEndOf="@+id/imageView3" />

    </android.support.constraint.ConstraintLayout>
</android.support.v7.widget.CardView>
</RelativeLayout>

---

用您现有的代码替换上述代码，我很难用鼠标管理

ConstraintLayout

，因此我将其更改为

LinearLayout

，这将实现您想要实现的目标。

在您的上下文中创建列表行CardView包装内容。尽管您可以在onBindViewHolder内的recycler视图中动态添加内容的高度，如下所示

 float proportionalHeight = getScreenWidth(yourViewHeight.getHeight(), yourViewWidth.getWidth());

                    if (proportionalHeight > 380) {
                        proportionalHeight = 380;
                    }

                    float px = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, proportionalHeight, resources.getDisplayMetrics());
                    RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, (int) px);
                    yourMainView.setLayoutParams(params);


private float getScreenWidth(int height, int width) {

            Configuration configuration = getActivity().getResources().getConfiguration();
            float screenWidthDp = configuration.screenWidthDp;
            float check = (float) height / width;
            Log.e("TAG", "getScreenWidth: " + screenWidthDp);
            Log.e("TAG", "return: " + check * screenWidthDp);
            return check * screenWidthDp;
        }

---

如果您不想坚持使用

ConstraintLayout

a

LinearLayout

可以简单地使其工作。

 float proportionalHeight = getScreenWidth(yourViewHeight.getHeight(), yourViewWidth.getWidth());

                    if (proportionalHeight > 380) {
                        proportionalHeight = 380;
                    }

                    float px = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, proportionalHeight, resources.getDisplayMetrics());
                    RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, (int) px);
                    yourMainView.setLayoutParams(params);


private float getScreenWidth(int height, int width) {

            Configuration configuration = getActivity().getResources().getConfiguration();
            float screenWidthDp = configuration.screenWidthDp;
            float check = (float) height / width;
            Log.e("TAG", "getScreenWidth: " + screenWidthDp);
            Log.e("TAG", "return: " + check * screenWidthDp);
            return check * screenWidthDp;
        }