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Android 基础:Materia Design 定义视图阴影elevation和创建卡片CardView

作者:互联网

新的  translationZ  属性使得你可以设计临时变更 elevation 的动画。elevation 变化在做触摸反馈时很有用。

创建列表和卡片

=======

RecyclerView 是一个可插入性更强的 ListView,它支持不同的 layout 类型,并可以提升性能。CardView 使得你可以在卡片

内显示一部分内容,并且和其他应用保持外观一致。以下是一段样例代码展示如何在 layout 中添加 CardView。

<android.support.v7.widget.CardView

android:id="@+id/card_view"

android:layout_width=“200dp”

android:layout_height=“200dp”

card_view:cardCornerRadius=“3dp”>

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

其中 card_view:cardCornerRadius 属性是改变卡片的四个角的半径的,如圆角,直角等。

下面通过官网的一个Sample来实例演示

====================

效果图


项目结构


代码

activity_card_view.xml:

<FrameLayout xmlns:android=“http://schemas.android.com/apk/res/android”

xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context="com.example.android.cardview.CardViewActivity"
tools:ignore="MergeRootFrame" />

fragment_card_view:

<ScrollView

xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_height="match_parent"
android:layout_width="match_parent"
>
<LinearLayout android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:orientation="vertical"
              android:paddingBottom="@dimen/activity_vertical_margin"
              android:paddingTop="@dimen/activity_vertical_margin"
              android:paddingLeft="@dimen/activity_horizontal_margin"
              android:paddingRight="@dimen/activity_horizontal_margin"
    >
    <android.support.v7.widget.CardView
        android:id="@+id/cardview"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:elevation="100dp"
        card_view:cardBackgroundColor="@color/cardview_initial_background"
        card_view:card

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CornerRadius=“8dp”

        android:layout_marginLeft="@dimen/margin_large"
        android:layout_marginRight="@dimen/margin_large"
        >
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_margin="@dimen/margin_medium"
            android:text="@string/cardview_contents"
            />
    </android.support.v7.widget.CardView>
    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="@dimen/margin_large"
        android:orientation="horizontal"
        >
        <TextView
            android:layout_width="@dimen/seekbar_label_length"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:text="@string/cardview_radius_seekbar_text"
            />
        <SeekBar
            android:id="@+id/cardview_radius_seekbar"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_margin="@dimen/margin_medium"
            />
    </LinearLayout>
    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        >
        <TextView
            android:layout_width="@dimen/seekbar_label_length"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:text="@string/cardview_elevation_seekbar_text"
            />
        <SeekBar
            android:id="@+id/cardview_elevation_seekbar"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_margin="@dimen/margin_medium"
            />
    </LinearLayout>
</LinearLayout>

CardViewActivity:

public class CardViewActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_card_view);
    if (savedInstanceState == null) {
        getFragmentManager().beginTransaction()
                .add(R.id.container, CardViewFragment.newInstance())
                .commit();
    }
}

}

CardViewFragment:

public class CardViewFragment extends Fragment {

private static final String TAG = CardViewFragment.class.getSimpleName();
/** The CardView widget. */
//@VisibleForTesting
CardView mCardView;
/**
 * SeekBar that changes the cornerRadius attribute for the {@link #mCardView} widget.
 */
//@VisibleForTesting
SeekBar mRadiusSeekBar;
/**
 * SeekBar that changes the Elevation attribute for the {@link #mCardView} widget.
 */
//@VisibleForTesting
SeekBar mElevationSeekBar;
/**
 * Use this factory method to create a new instance of

标签:Materia,layout,dimen,视图,height,width,elevation,android,margin
来源: https://blog.csdn.net/m0_64604042/article/details/122022427