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Android初学第85天

androidIT知识Android初学

少年击剑更吹箫，剑气箫心一例消。这篇文章主要讲述Android初学第85天相关的知识，希望能为你提供帮助。
android初学第85天【Android初学第85天】24_NerdLauncher
代码 Nerdlauncher
NerdLauncherActivity.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(); } }}


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