Android5.x之CardView

今天发现了一个好玩的东西，，CardVeiw卡片式布局，是Google在5.0新推出的v7兼容包继承自FramLayout，也就是说它是一个ViewGroup,那么他比Framlayout多了什么呢

A FrameLayout with a rounded corner background and shadow.

/**

*这个FrameLayout特殊点就是有rounded corner（圆角）和shadow（阴影），

*这个就是它的特殊之处，回首往日，我们需要自定义shape文件进行实现圆角和阴影的设计，

*现在google的大牛已经把它设计为CardView的属性供我们设置进行使用。下面我们看看CardView新增了哪些属性：

*CardView_cardBackgroundColor 设置背景色

*CardView_cardCornerRadius 设置圆角大小

*CardView_cardElevation 设置z轴阴影

*CardView_cardMaxElevation 设置z轴最大高度值

*CardView_cardUseCompatPadding 是否使用CompadPadding

*CardView_cardPreventCornerOverlap 是否使用PreventCornerOverlap

*CardView_contentPadding 内容的padding

*CardView_contentPaddingLeft 内容的左padding

*CardView_contentPaddingTop 内容的上padding

*CardView_contentPaddingRight 内容的右padding

*CardView_contentPaddingBottom 内容的底padding

*card_view:cardUseCompatPadding 设置内边距，V21+的版本和之前的版本仍旧具有一样的计算方式

*card_view:cardPreventConrerOverlap 在V20和之前的版本中添加内边距，这个属性为了防止内容和边角的重叠

*/

给大家看一个结合RecyclerView来实现卡片效果的例子

public class MainActivity extends Activity {
private RecyclerView mRecyclerView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mRecyclerView = (RecyclerView) findViewById(R.id.recycler_view);
List<ImageInfor> list = new ArrayList<>();
list.add(new ImageInfor(R.mipmap.caiyilin, "蔡依林"));
list.add(new ImageInfor(R.mipmap.ulinxinru, "林心如"));
list.add(new ImageInfor(R.mipmap.caiyilin,"蔡依林"));
list.add(new ImageInfor(R.mipmap.ulinxinru, "林心如"));
list.add(new ImageInfor(R.mipmap.caiyilin,"蔡依林"));
list.add(new ImageInfor(R.mipmap.ulinxinru, "林心如"));
RecyclerView.LayoutManager manager = new LinearLayoutManager(this,LinearLayoutManager.VERTICAL,true);
mRecyclerView.setLayoutManager(manager);
mRecyclerView.setItemAnimator(new DefaultItemAnimator());
MyAdapter myAdapter = new MyAdapter(list);
mRecyclerView.setAdapter(myAdapter);
myAdapter.setOnItemClick(new OnItemClick(){
@Override
public void onItemClick(View view, int position) {
Toast.makeText(getApplication(),"点击了：" + position,Toast.LENGTH_SHORT).show();
}
});
}

class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder>{
private List<ImageInfor> list;
public MyAdapter(List<ImageInfor> list){
this.list = list;
}
@Override
public MyViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.carditem,viewGroup,false);
return new MyViewHolder(view);
}

@Override
public void onBindViewHolder(MyViewHolder myViewHolder, int i) {
myViewHolder.iv_backgroud.setBackgroundResource(list.get(i).getImageId());
myViewHolder.tv_title.setText(list.get(i).getName());
final int position = i;
myViewHolder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if(onItemClick != null){
onItemClick.onItemClick(view,position);
}
}
});
}

@Override
public int getItemCount() {
return list.size();
}

class MyViewHolder extends RecyclerView.ViewHolder {
private ImageView iv_backgroud;
private TextView tv_title;
public MyViewHolder(View itemView) {
super(itemView);
iv_backgroud = (ImageView) itemView.findViewById(R.id.picture);
tv_title = (TextView) itemView.findViewById(R.id.name);
}
}

private OnItemClick onItemClick;

public void setOnItemClick(OnItemClick onItemClick) {
this.onItemClick = onItemClick;
}
}
}

还有bean和自定义监听接口‘

public class ImageInfor {
private String name;
private int imageId;

public ImageInfor(int imageId, String name) {
this.imageId = imageId;
this.name = name;
}

public int getImageId() {
return imageId;
}

public void setImageId(int imageId) {
this.imageId = imageId;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}
}
//
public interface OnItemClick {
public void onItemClick(View view, int position);
}

重点就是item的布局

<?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"
app:cardBackgroundColor="#80cbc4"
app:cardCornerRadius="30dp"
app:cardPreventCornerOverlap="true"
app:cardUseCompatPadding="true"
app:cardElevation="10dp"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="200dp">
<ImageView
android:id="@+id/picture"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_centerInParent="true"
android:scaleType="centerCrop" />
<TextView
android:clickable="true"
android:id="@+id/name"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginBottom="10dp"
android:layout_marginRight="10dp"
android:gravity="right|bottom"
android:textColor="@android:color/white"
android:textSize="24sp" />
</RelativeLayout>

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

this all.