Android初學第85天

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Android初學第85天

24_NerdLauncher

代碼NerdlauncherNerdLauncherActivity.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.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 java.util.Collections;import java.util.Comparator;import java.util.List;public class NerdLauncherFragment extends Fragment {    public 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>() {            @Override            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 view) {            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) {            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();        }    }}

Android初學第85天