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

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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

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效果图

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项目结构

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代码

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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