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   源码介绍

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package com.example.sph.queryapp;

import android.app.Activity;
import android.app.Application;
import android.content.Context;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.text.Layout;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

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


public class MainActivity extends Activity {
    private Button customAppbut = null;
    private Button systemAppbut = null;
    private Button deleteAppbut = null;
    private ListView listView = null;
    private List<ApplicationInfo> customerApps = null;
    private List<ApplicationInfo> systemApps =null;
    private Myadapter myadapter = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        customAppbut = (Button) findViewById(R.id.customer);
        systemAppbut = (Button) findViewById(R.id.button2);
        deleteAppbut = (Button) findViewById(R.id.button3);
        listView = (ListView) findViewById(R.id.listview);
        //加载系统app
        loadApp();
        myadapter = new Myadapter(this,customerApps);
        listView.setAdapter(myadapter);
        customAppbut.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                updateList(customerApps);
                deleteAppbut.setText("可以卸载");
            }
        });
        systemAppbut.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                updateList(systemApps);
                deleteAppbut.setText("不可以卸载");
            }
        });
    }

    /**
     *
     */
    public void loadApp(){
        customerApps = new ArrayList<ApplicationInfo>();
        systemApps = new ArrayList<ApplicationInfo>();
        PackageManager pm =  this.getPackageManager();
        List<ApplicationInfo> packages = pm.getInstalledApplications(PackageManager.GET_META_DATA);

        Toast.makeText(this, "packages ="   packages.size(), Toast.LENGTH_LONG).show();
        for (ApplicationInfo pi: packages){
            if ((pi.flags&ApplicationInfo.FLAG_SYSTEM ) != 0){
                systemApps.add(pi);
                Log.d("yzmyzm", "====systemApps====="   systemApps.size());
            }
            else
            {
                customerApps.add(pi);
                Log.d("yzmyzm", "====customerApps====="   customerApps.size());
            }

        }

    }
/*

    private boolean isCustomer(ApplicationInfo info){
        if ((info.flags&ApplicationInfo.FLAG_SYSTEM ) != 0){
           return  true;

        }

           return false;


    }
*/

    /**
     *
     *
     *
     */
    public void updateList(List<ApplicationInfo> apps)
    {
        myadapter.setDatas(apps);
        myadapter.notifyDataSetChanged();
    }
    static class ViewHolder{
        public ImageView appicon;
        public TextView appname;
        public TextView  packagename;
    }

    class Myadapter extends BaseAdapter{
        private LayoutInflater mInflater = null;
        private List<ApplicationInfo> apps;
        private  Myadapter(Context context ,List<ApplicationInfo> apps){
            this.mInflater = LayoutInflater.from(context);
            this.apps = apps;
        }
        public void setDatas(List<ApplicationInfo> apps){
            this.apps = apps;
        }



        @Override
        public int getCount() {
            return customerApps.size();
        }

        @Override
        public Object getItem(int position) {
            return  position;
        }

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

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            ViewHolder holder = null;
            if (convertView ==  null){
                holder = new ViewHolder();
                convertView = mInflater.inflate(R.layout.list_line,null);
                holder.appicon = (ImageView) convertView.findViewById(R.id.icon);
                holder.appname = (TextView) convertView.findViewById(R.id.appname);
                holder.packagename = (TextView) convertView.findViewById(R.id.packagename);
                convertView.setTag(holder);
            }else{
                holder = (ViewHolder) convertView.getTag();

            }
            PackageManager  pm = getPackageManager();
            ApplicationInfo info = apps.get(position);

            holder.appicon.setImageDrawable(pm.getApplicationIcon(info));
            holder.appname.setText(pm.getApplicationLabel(info));
            holder.packagename.setText(info.packageName);
                return convertView;

        }
    }
}