Android CardView和Palette

• CardView
  用法：

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:orientation="vertical" android:layout_width="match_parent" app:cardCornerRadius="15px" app:cardElevation="5px" android:layout_margin="3dp" android:layout_height="match_parent">
    <TextView  android:id="@+id/id_text" android:layout_width="72dp" android:layout_height="50dp" android:gravity="center" android:background="#ffbbaa" />

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

我们看下CradView有哪些属性：方法：打开cradview包，直接查看values文件。

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <!-- From: file:/usr/local/google/buildbot/repo_clients/https___googleplex-android.googlesource.com_a_platform_manifest.git/mnc-sdk-release/frameworks/support/v7/cardview/res/values/colors.xml -->
    <eat-comment/>
    <color name="cardview_dark_background">#FF202020</color>
    <color name="cardview_light_background">#FFFAFAFA</color>
    <color name="cardview_shadow_end_color">#03000000</color>
    <color name="cardview_shadow_start_color">#37000000</color>
    <declare-styleable name="CardView"><attr format="color" name="cardBackgroundColor"/><attr format="dimension" name="cardCornerRadius"/><attr format="dimension" name="cardElevation"/><attr format="dimension" name="cardMaxElevation"/><attr format="boolean" name="cardUseCompatPadding"/><attr format="boolean" name="cardPreventCornerOverlap"/><attr format="dimension" name="contentPadding"/><attr format="dimension" name="contentPaddingLeft"/><attr format="dimension" name="contentPaddingRight"/><attr format="dimension" name="contentPaddingTop"/><attr format="dimension" name="contentPaddingBottom"/></declare-styleable>
    <!-- From: file:/usr/local/google/buildbot/repo_clients/https___googleplex-android.googlesource.com_a_platform_manifest.git/mnc-sdk-release/frameworks/support/v7/cardview/res/values/dimens.xml -->
    <eat-comment/>
    <dimen name="cardview_compat_inset_shadow">1dp</dimen>
    <dimen name="cardview_default_elevation">2dp</dimen>
    <dimen name="cardview_default_radius">2dp</dimen>
    <!-- From: file:/usr/local/google/buildbot/repo_clients/https___googleplex-android.googlesource.com_a_platform_manifest.git/mnc-sdk-release/frameworks/support/v7/cardview/res/values/styles.xml -->
    <eat-comment/>
    <style name="CardView"> <item name="cardBackgroundColor">@color/cardview_light_background</item> <item name="cardCornerRadius">@dimen/cardview_default_radius</item> <item name="cardElevation">@dimen/cardview_default_elevation</item> <item name="cardMaxElevation">@dimen/cardview_default_elevation</item> <item name="cardUseCompatPadding">false</item> <item name="cardPreventCornerOverlap">true</item> </style>
    <style name="CardView.Dark"> <item name="cardBackgroundColor">@color/cardview_dark_background</item> </style>
    <style name="CardView.Light"> <item name="cardBackgroundColor">@color/cardview_light_background</item> </style>
</resources>

//卡片的背景色
@color/cardview_light_background
@dimen/cardview_default_radius
//阴影的大小
@dimen/cardview_default_elevation
//阴影的最大高度
@dimen/cardview_default_elevation
//内边距
false
//防止内容和边角重叠
true

其他的就不说了。

• palette 取色器
  
  构造方法 ：
  generate..() 4种
  取色的方法：
  2类，与主题有关。Dark和Light
  get..Color()获取颜色
  get..Swatch()获取样本。
  用法：

Drawable dr = paletteImage.getDrawable();
        Bitmap bitmap = drawableTo(dr);

        palette = Palette.generate(bitmap);
        getSupportActionBar().setBackgroundDrawable(new ColorDrawable(palette.getLightVibrantColor(Color.YELLOW)));

public Bitmap drawableTo(Drawable dr){
        Bitmap bitmap = Bitmap.createBitmap(dr.getIntrinsicWidth(),
                dr.getIntrinsicHeight(),
                dr.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565);

        Canvas canvas = new Canvas(bitmap);
        dr.setBounds(0,0,dr.getIntrinsicWidth(),dr.getIntrinsicHeight());
        dr.draw(canvas);

        return bitmap;
    }

效果图：