java - 排序应用程序列表 Android Java

Question

我有一个 InstalledAppsAdapter

import android.content.Context;
import android.content.Intent;
import android.graphics.drawable.Drawable;
import android.support.v7.widget.CardView;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import java.util.List;

public class InstalledAppsAdapter extends RecyclerView.Adapter<InstalledAppsAdapter.ViewHolder> {

    private Context mContext;
    private List<String> mDataSet;

    public InstalledAppsAdapter(Context context, List<String> list){
        mContext = context;
        mDataSet = list;
    }

    public static class ViewHolder extends RecyclerView.ViewHolder{
        public CardView mCardView;
        public TextView mTextViewLabel;
        public TextView mTextViewPackage;
        public ImageView mImageViewIcon;

        public ViewHolder (View v){
            super(v);
            // Get the widgets reference from custom layout
            mCardView = (CardView) v.findViewById(R.id.card_view);
            mTextViewLabel = (TextView) v.findViewById(R.id.app_label);
            mTextViewPackage = (TextView) v.findViewById(R.id.app_package);
            mImageViewIcon = (ImageView) v.findViewById(R.id.iv_icon);
        }
    }

    @Override
    public InstalledAppsAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType){
        View v = LayoutInflater.from(mContext).inflate(R.layout.apps_list,parent,false);
        ViewHolder vh = new ViewHolder(v);
        return vh;
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position){
        // Initialize a new instance of AppManager class
        AppsManager appsManager = new AppsManager(mContext);

        // Get the current package name
        final String packageName = (String) mDataSet.get(position);

        // Get the current app icon
        Drawable icon = appsManager.getAppIconByPackageName(packageName);

        // Get the current app label
        String label = appsManager.getApplicationLabelByPackageName(packageName);

        // Set the current app label
        holder.mTextViewLabel.setText(label);

        // Set the current app package name
        holder.mTextViewPackage.setText(packageName);

        // Set the current app icon
        holder.mImageViewIcon.setImageDrawable(icon);

        // Set a click listener for CardView
        holder.mCardView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                // Get the intent to launch the specified application
                Intent intent = mContext.getPackageManager().getLaunchIntentForPackage(packageName);
                if(intent != null){
                    mContext.startActivity(intent);
                }else {
                    Toast.makeText(mContext,packageName + " Launch Error.", Toast.LENGTH_SHORT).show();
                }
            }
        });
    }

    @Override
    public int getItemCount(){
        // Count the installed apps
        return mDataSet.size();
    }

}

和 AppsManager

import android.content.Context;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.graphics.drawable.Drawable;
import android.support.v4.content.ContextCompat;

import java.util.ArrayList;
import java.util.List;


public class AppsManager {
    private Context mContext;

    public AppsManager(Context context){
        mContext = context;
    }

    // Get a list of installed app
    public List<String> getInstalledPackages(){
        // Initialize a new Intent which action is main
        Intent intent = new Intent(Intent.ACTION_MAIN,null);

        // Set the newly created intent category to launcher
        intent.addCategory(Intent.CATEGORY_LAUNCHER);

        // Set the intent flags
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK|Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);

        // Generate a list of ResolveInfo object based on intent filter
        List<ResolveInfo> resolveInfoList = mContext.getPackageManager().queryIntentActivities(intent,0);

        // Initialize a new ArrayList for holding non system package names
        List<String> packageNames = new ArrayList<>();

        // Loop through the ResolveInfo list
        for(ResolveInfo resolveInfo : resolveInfoList){
            // Get the ActivityInfo from current ResolveInfo
            ActivityInfo activityInfo = resolveInfo.activityInfo;

            // If this is not a system app package
            if(!isSystemPackage(resolveInfo)){
                // Add the non system package to the list
                packageNames.add(activityInfo.applicationInfo.packageName);
            }
        }

        return packageNames;

    }

    // Custom method to determine an app is system app
    public boolean isSystemPackage(ResolveInfo resolveInfo){
        return ((resolveInfo.activityInfo.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0);
    }

    // Custom method to get application icon by package name
    public Drawable getAppIconByPackageName(String packageName){
        Drawable icon;
        try{
            icon = mContext.getPackageManager().getApplicationIcon(packageName);
        }catch (PackageManager.NameNotFoundException e){
            e.printStackTrace();
            // Get a default icon
            icon = ContextCompat.getDrawable(mContext,R.mipmap.ic_apps);
        }
        return icon;
    }

    // Custom method to get application label by package name
    public String getApplicationLabelByPackageName(String packageName){
        PackageManager packageManager = mContext.getPackageManager();
        ApplicationInfo applicationInfo;
        String label = "Unknown";
        try {
            applicationInfo = packageManager.getApplicationInfo(packageName, 0);
            if(applicationInfo!=null){
                label = (String)packageManager.getApplicationLabel(applicationInfo);
            }

        }catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
        }
        return label;
    }
}

我想用应用名称而不是包名称对适配器进行排序，我该怎么做？

我这样设置适配器

mLayoutManager = new LinearLayoutManager(mContext); // new GridLayoutManager(mContext,2);
mRecyclerView.setLayoutManager(mLayoutManager);

// Initialize a new adapter for RecyclerView
mAdapter = new InstalledAppsAdapter(
        mContext,
        new AppsManager(mContext).getInstalledPackages()
);

// Set the adapter for RecyclerView
mRecyclerView.setAdapter(mAdapter);

只想按应用程序名称升序而不是包名称对应用程序列表进行排序

Answer 1

好吧，伙计们，在弄乱了 holders 之后，bla bla 简单的事情就是这样

在 AppsManager.java 中

Collections.sort(resolveInfoList, new ResolveInfo.DisplayNameComparator(pm));

完成