首先固然应该来一个RecyclerView,直接上代码:java
public class MainActivity extends AppCompatActivity {
private RecyclerView recyclerView;
private ArrayList<String> titles = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//初始化RecyclerView
recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
recyclerView.setLayoutManager(new LinearLayoutManager(this,LinearLayoutManager.VERTICAL,false));
for (int i = 0; i < 20; i++) {
titles.add("标题"+i);
}
recyclerView.setAdapter(new RecyclerViewAdapter(this,titles));
}
}
RecyclerView适配器android
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder> {
private Context context;
private ArrayList<String> datas;
public RecyclerViewAdapter(Context context, ArrayList<String> datas) {
this.context = context;
this.datas = datas;
}
@NonNull
@Override
public ViewHoulder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(contextl).inflate(R.layout.layout,viewGroup,false);
return new ViewHoulder(view);
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
//根据position获得对应的数据
String data = datas.get(position);
holder.tvTitle.setText(data);
}
/** * 获得总条数 */
@Override
public int getItemCount() {
return datas.size();
}
class ViewHolder extends RecyclerView.ViewHolder {
ImageView ivIcon;
TextView tvTitle;
public ViewHolder(View itemView) {
super(itemView);
ivIcon = (ImageView) itemView.findViewById(R.id.iv_icon);
tvTitle = (TextView) itemView.findViewById(R.id.tv_title);
}
}
}
运行以后是这样的:web
这个是没有分割线的。ide
接下来添加默认的分割线
如今咱们就来添加分割线,首先来试试最简单的,也就是安卓自带的分割线。只须要加一行代码便可。svg
//添加Android自带的分割线 recyclerView.addItemDecoration(new DividerItemDecoration(this,DividerItemDecoration.VERTICAL));
addItemDecoration方法须要一个DividerItemDecoration的对象,而建立其对象时,咱们须要传入上下文和分割线的方向。运行一下,就能够看到分割线出现了:函数
若是不满意还能够自定义分割线布局
打开DividerItemDecoration看看它的源码,有这么一个函数:this
public void setDrawable(@NonNull Drawable drawable) { if (drawable == null) { throw new IllegalArgumentException("Drawable cannot be null."); } mDivider = drawable; }
咱们只须要调用这个方法,而后传入一个Drawable函数对象就能够了。如今能够用shape来编写一个分割线样式:spa
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle">
<gradient android:centerColor="#ff00ff00" //绿色 android:endColor="#ff0000ff" //蓝色 android:startColor="#ffff0000" //红色 android:type="linear" />
<size android:height="3dp" />
</shape>
这里弄的是一条渐变色分割线。而后添加分割线的代码改成以下:scala
//添加自定义分割线
DividerItemDecoration divider = new DividerItemDecoration(this,DividerItemDecoration.VERTICAL);
divider.setDrawable(ContextCompat.getDrawable(this,R.drawable.custom_divider));
recyclerView.addItemDecoration(divider);
跑起来以后,就能够看到一条多彩的分割线了:
这样一来使用范围就广不少了,好比item之间须要必定的间隔,那么咱们就能够加一条透明的分割线。
添加分割线的代码很简单,之后须要加一条简单的分割线时就能够这么处理。注意这只适用于列表布局(LinearLayout)的RecyclerView,网格布局(GridLayout)和流式布局(StaggeredGridLayout)就不适用了。