Android 5.0 CardView 应用

CardView 属于Support v7 里面的新的Widget.  扩展于FrameLayout，

UI显示主要包括

1.边框圆角

2.有阴影Shadow

用来突出个性，比如展览，相册等。

主布局

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" 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.gaofeng.recyclerviewdemo.CardViewActivity"
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    >

    <android.support.v7.widget.CardView
        xmlns:card_view="http://schemas.android.com/apk/res-auto"
        android:id="@+id/card_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        card_view:cardBackgroundColor="@android:color/white"
        android:layout_marginLeft="@dimen/activity_horizontal_margin"
        android:layout_marginRight="@dimen/activity_horizontal_margin"
        android:layout_marginTop="5dp"
        android:layout_marginBottom="5dp"
        card_view:cardCornerRadius="10dp"
        card_view:cardElevation="24dp">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:paddingBottom="@dimen/activity_vertical_margin"
        android:paddingTop="@dimen/activity_vertical_margin" >

        <ImageView
            android:id="@+id/img"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:src="@drawable/cat0"
            android:layout_centerHorizontal="true"
            android:scaleType="fitCenter" />

        <TextView
            android:id="@+id/text_desc"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/img"
            android:layout_centerHorizontal="true"
            android:text="This is a card view"
            android:paddingLeft="@dimen/activity_horizontal_margin"
            android:paddingRight="@dimen/activity_horizontal_margin" />
    </RelativeLayout>
 </android.support.v7.widget.CardView>

    <SeekBar
        android:layout_below="@+id/card_view"
        android:id="@+id/seek1"
        android:layout_marginTop="10dp"
        android:layout_width="150dp"
        android:layout_height="30dp"
        />

    <SeekBar
        android:layout_below="@+id/seek1"
        android:id="@+id/seek2"
        android:layout_marginTop="10dp"
        android:layout_width="150dp"
        android:layout_height="30dp"
        />
</RelativeLayout>

重要的几个属性：

card_view:cardCornerRadius="10dp"  圆角的半径

card_view:cardElevation="24dp"         阴影shadow

SeekBar用来测试这2个值的。

package com.example.gaofeng.recyclerviewdemo;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.support.v7.widget.CardView;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.SeekBar;

public class CardViewActivity extends ActionBarActivity {

    CardView cardView = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_card_view);

        cardView = (CardView) findViewById(R.id.card_view);

        SeekBar seek1 = (SeekBar) findViewById(R.id.seek1);
        SeekBar seek2 = (SeekBar) findViewById(R.id.seek2);

        seek1.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int i, boolean b) {
                if (b) {
                   cardView.setCardElevation(i);//shadow
                }
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {

            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {

            }
        });

        seek2.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int i, boolean b) {
                if (b) {
                    cardView.setRadius(i);//圆角大小设置
                }
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {

            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {

            }
        });

    }

有的5.0的模拟器看不到 Shadow 建一个Nexus 1080的模拟器 可以看到。

拖SeekBar 大点 有明显的 阴影和圆角。

build.gradle 加入依赖

dependencies {
    compile 'com.android.support:appcompat-v7:22.0.0'
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:recyclerview-v7:21.0.+'
    compile 'com.android.support:cardview-v7:21.0.+'
}