今天的任務為在執行時建立顯示intent，程式碼如下：

NerdLauncherFragment.java:

package com.bignerdranch.android.nerdlauncher;

import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.os.Bundle;
import android.support.annotation.NonNull
 
;
import android.support.v4.app.Fragment;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import 
 
org.w3c.dom.Text;

import java.util.Collections;
import java.util.Comparator;
import java.util.List;

public class NerdLauncherFragment extends Fragment {
    private static final String TAG="NerdLauncherFragment";
    private RecyclerView mRecyclerView;

    public static NerdLauncherFragment newInstance(){
        return new 
 
NerdLauncherFragment();
    }

    @Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState){
        View v=inflater.inflate(R.layout.fragment_nerd_launcher,container,false);
        mRecyclerView=(RecyclerView)v.findViewById(R.id.app_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>() {
            public int compare(ResolveInfo a, ResolveInfo b) {
                PackageManager pm = getActivity().getPackageManager();
                return String.CASE_INSENSITIVE_ORDER.compare(
                        a.loadLabel(pm).toString(),
                        b.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;

        public ActivityHolder(View itemView) {
            super(itemView);
            mNameTextView=(TextView)itemView;
            mNameTextView.setOnClickListener(this);
        }

        public void bindActivity(ResolveInfo resolveInfo){
            mResolveInfo=resolveInfo;
            PackageManager pm=getActivity().getPackageManager();
            String appName=mResolveInfo.loadLabel(pm).toString();
            mNameTextView.setText(appName);
        }

        @Override
public void onClick(View v) {
            ActivityInfo activityInfo=mResolveInfo.activityInfo;

            Intent i=new Intent(Intent.ACTION_MAIN)
                    .setClassName(activityInfo.applicationInfo.packageName,
                            activityInfo.name);

            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) {
            LayoutInflater layoutInflater=LayoutInflater.from(getActivity());
            View view=layoutInflater
                    .inflate(android.R.layout.simple_list_item_1,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();
        }
    }
}

執行效果如下：