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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