Question

我在操作栏中有可滚动的标签，在其中一个标签中我试图获取用户安装的应用程序列表和使用过的系统应用程序，如Flipoard，youtube，message等（最终按字母顺序排列）

我正在尝试遵循这些，但我在执行它时遇到了一些错误，因为我正在使用片段。

How to get a list of installed android applications and pick one to run

http://javatechig.com/android/how-to-get-list-of-installed-apps-in-android

http://techblogon.com/get-installed-applications-list-android-example/

这就是我对片段的看法：

package com.spicycurryman.getdisciplined10.app;

import android.app.ProgressDialog;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageItemInfo;
import android.content.pm.PackageManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;

import com.ibc.android.demo.appslist.app.ApplicationAdapter;

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



public class InstalledAppActivity extends Fragment
        implements OnItemClickListener {

    PackageManager packageManager;
    ListView apkList;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        setHasOptionsMenu(true);
        View rootView = inflater.inflate(R.layout.user_installed, container, false);
        packageManager = getActivity().getPackageManager();


        /*To filter out System apps*/

        apkList = (ListView) rootView.findViewById(R.id.applist);

        new LoadApplications().execute();


        return rootView;
    }

    /**
     * Return whether the given PackageInfo represents a system package or not.
     * User-installed packages (Market or otherwise) should not be denoted as
     * system packages.
     *
     * @parampkgInfo
     * @return boolean
     */
/*    private boolean isSystemPackage(ApplicationInfo pkgInfo) {
        return ((pkgInfo.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0) ? true
                : false;
    }*/


// Don't need in Fragment
/*@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
    inflater.inflate(R.menu.block, menu);
   // super.onCreateOptionsMenu(menu,inflater);
}*/

    @Override
    public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {

    }


    private class LoadApplications extends AsyncTask<Void, Void, Void> {
        private ProgressDialog pDialog;
        List<ApplicationInfo> packageList1 = new ArrayList<ApplicationInfo>();


        @Override
        protected Void doInBackground(Void... params) {
            List<ApplicationInfo> packages = packageManager.getInstalledApplications(PackageManager.GET_META_DATA);



            for(ApplicationInfo pi : packages) {

                packageList1.add(pi);


            }

            //sort by application name

            final PackageItemInfo.DisplayNameComparator comparator = new PackageItemInfo.DisplayNameComparator(packageManager);

            /*Collections.sort(packageList1, new Comparator<PackageInfo>() {
                @Override
                public int compare(PackageInfo lhs, PackageInfo rhs) {
                    return comparator.compare(lhs.applicationInfo, rhs.applicationInfo);
                }
            });*/

            return null;
        }

        @Override
        protected void onCancelled() {
            super.onCancelled();
        }

        @Override
        protected void onPreExecute() {
            pDialog = new ProgressDialog(InstalledAppActivity.this.getActivity());
            pDialog.setMessage("Loading your apps...");
            pDialog.show();

        }

        @Override
        protected void onPostExecute(Void result) {

            apkList.setAdapter(new ApplicationAdapter(getActivity(), packageList1, packageManager));

            if (pDialog.isShowing()){
                pDialog.dismiss();

        }


            super.onPostExecute(result);
        }


        @Override
        protected void onProgressUpdate(Void... values) {
            super.onProgressUpdate(values);
        }
    }

}

这是我的ArrayAdapter类：

package com.ibc.android.demo.appslist.app;

import android.content.Context;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import com.spicycurryman.getdisciplined10.app.R;

import java.util.List;
public class ApplicationAdapter extends ArrayAdapter<ApplicationInfo> {
    private List<ApplicationInfo> appsList = null;
    private Context context;
    private PackageManager packageManager;

    public ApplicationAdapter(Context context, List<ApplicationInfo> textViewResourceId,
                              PackageManager appsList) {
        super(context, textViewResourceId, appsList);
        this.context = context;
        this.appsList = (List<ApplicationInfo>) appsList;
        packageManager = context.getPackageManager();
    }

    @Override
    public int getCount() {
        return ((null != appsList) ? appsList.size() : 0);
    }

    @Override
    public ApplicationInfo getItem(int position) {
        return ((null != appsList) ? appsList.get(position) : null);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View view = convertView;
        if (null == view) {
            LayoutInflater layoutInflater = (LayoutInflater) context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            view = layoutInflater.inflate(R.layout.snippet_list_row, null);
        }

        ApplicationInfo data = appsList.get(position);
        if (null != data) {
            TextView appName = (TextView) view.findViewById(R.id.app_name);
            TextView packageName = (TextView) view.findViewById(R.id.app_package);
            ImageView iconview = (ImageView) view.findViewById(R.id.app_icon);

            appName.setText(data.loadLabel(packageManager));
            packageName.setText(data.packageName);
            iconview.setImageDrawable(data.loadIcon(packageManager));
        }
        return view;
    }
};

这是我得到的当前错误。

enter image description here

我不确定应该怎么做才能解决此错误，并在片段中按字母顺序成功获取用户安装和使用过的系统应用程序列表。

我的方法可以做些什么，我该如何实现？

Answer 1

您传递给super类的构造函数的一个参数，即ArrayAdapter，与任何ArrayAdapter的构造函数都不匹配。

我认为该参数是PackageManager appsList，您应该传递一个List<T> appsList来匹配定义的here构造函数。

尝试获取已安装的应用时出现ApplicationAdapter错误

1 个答案: