android recycleview 的使用

public class NerdLauncherFragment extends Fragment {
    private static final String TAG = "NerdLauncherFragment";
    private RecyclerView mRecyclerView;
    public static NerdLauncherFragment newInstance() {
        return new NerdLauncherFragment();
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.fragment_nerd_launcher, container, false);
        mRecyclerView= (RecyclerView) v.findViewById(R.id.fragment_nerd_launcher_recycler_view);
        mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
        setupAdapter();
        return v;
    }

    private void setupAdapter() {
        Intent startupIntent = new Intent(Intent.ACTION_MAIN);
        startupIntent.addCategory(Intent.CATEGORY_LAUNCHER);
        PackageManager pm = getActivity().getPackageManager();
        List<ResolveInfo> activities = pm.queryIntentActivities(startupIntent, 0);
        Collections.sort(activities, new Comparator<ResolveInfo>() {
            @Override
            public int compare(ResolveInfo lhs, ResolveInfo rhs) {
                PackageManager pm = getActivity().getPackageManager();
                return String.CASE_INSENSITIVE_ORDER.compare(lhs.loadLabel(pm).toString(),rhs.loadLabel(pm).toString());
            }
        });
        Log.i(TAG, "Found " + activities.size() + " activities.");
        mRecyclerView.setAdapter(new ActivityAdapter(activities));
    }
    private class ActivityHolder extends RecyclerView.ViewHolder implements View.OnClickListener{

        private ResolveInfo mResolveInfo;
        private TextView mNameTextView;
        private ImageView mImageView;

        public ActivityHolder(View itemView) {
            super(itemView);
            mNameTextView= (TextView) itemView.findViewById(R.id.textView);
            mImageView= (ImageView) itemView.findViewById(R.id.imageView);
            mNameTextView.setOnClickListener(this);
        }
        public void bindActivity(ResolveInfo resolveInfo){
            mResolveInfo=resolveInfo;
            PackageManager pm = getActivity().getPackageManager();
            String appName = mResolveInfo.loadLabel(pm).toString();
            mNameTextView.setText(appName);
            Drawable icon = mResolveInfo.loadIcon(pm);
            mImageView.setImageDrawable(icon);
        }

        @Override
        public void onClick(View v) {
            ActivityInfo activityInfo = mResolveInfo.activityInfo;
            Intent i = new Intent(Intent.ACTION_MAIN).setClassName(activityInfo.applicationInfo.packageName, activityInfo.name).addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            startActivity(i);
        }
    }
    private class ActivityAdapter extends RecyclerView.Adapter<ActivityHolder>{

        private final List<ResolveInfo> mActivities;

        public ActivityAdapter(List<ResolveInfo> activities){
            mActivities = activities;
        }
        @Override
        public ActivityHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            View view = LayoutInflater.from(getActivity()).inflate(R.layout.list_item, parent, false);
            return new ActivityHolder(view);
        }

        @Override
        public void onBindViewHolder(ActivityHolder holder, int position) {
            ResolveInfo resolveInfo = mActivities.get(position);
            holder.bindActivity(resolveInfo);
        }

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

fragment_nerd_launcher:

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.RecyclerView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/fragment_nerd_launcher_recycler_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

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

 list_item:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal" android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
</LinearLayout>

首先写一个类集成Fragment  

在onCreateView中用inflate添加一个布局文件,用布局文件找到对应的recycleview,并recycleview.setLayoutManager(new LinearLayoutManager(getActivity()));然后setadapter();

写一个内部类继承RecyclerView.ViewHolder,这个类的构造方法主要是找到控件并设置监听事件.然后写一个方法,这个方法主要是显示recycleview的条目.

然后再写一个内部类继承RecyclerView.Adapter<写上面写的那个viewholder>,重写三个方法onCreateViewHolder,onBindViewHolder,getItemCount.其中onCreateViewHolder方法中托管一个布局作为viewholfer的样式,就像listview的条目,
在onBindViewHolder方法中调用viewholder中的方法.在getItemCount方法中返回recycleview条目的个数.