Android listview需要花费很多时间来加载和更多内存

Question

我有一个listview的自定义适配器，它的工作正常。但是将数据加载到listview需要15秒以上，并使用60mb的ram内存。请告诉我这是什么问题以及为什么花费太多时间？请帮我一些代码或编辑我的代码。这是我的代码。提前致谢！ 自定义适配器

public class Listadapter extends BaseAdapter {
    CheckBox checkBox;
    boolean index[];
    boolean[] itemChecked;
    ApplicationInfo entry;
    String[] itempkg;
    private Context mContext;
    private List<ApplicationInfo> mListAppInfo;
    private PackageManager mPackManager;
    private ArrayList<Boolean> checkList = new ArrayList<Boolean>();

    public Listadapter(Context applicationContext, List<ApplicationInfo> installedApplication, PackageManager packageManager)
    {
        //super(applicationContext,textViewResourceId,installedApplication);
        super();
        this.mContext = applicationContext;
        this.mListAppInfo = installedApplication;
        index = new boolean[installedApplication.size()];
        this.mPackManager = packageManager;
        for (int i = 0; i < installedApplication.size(); i++) {
            checkList.add(false);
            itemChecked = new boolean[installedApplication.size()];
            itempkg = new String[installedApplication.size()];
        }
    }
    @Override
    public int getCount()
    {
        return mListAppInfo.size();
        //return ((null != mListAppInfo) ? mListAppInfo.size() : 0);
    }
    @Override
    public Object getItem(int position)
    {
        // index = new boolean[mListAppInfo.size()];
        return mListAppInfo.get(position);
    }
    @Override
    public long getItemId(int position)
    {
        return position;
    }
    @Override
    public View getView(final int position, View convertView, ViewGroup parent)
    {
        // get the selected entry

        final ViewHolder holder;

        //  LayoutInflater inflater = (LayoutInflater) mContext.getLayoutInflater();
        LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        if (convertView == null) {
            convertView = inflater.inflate(R.layout.list_item, null);
            holder = new ViewHolder();
            // reference to convertView
            holder.tvAppName = (TextView) convertView
                    .findViewById(R.id.textView1);
            holder.tvPkgName = (TextView) convertView
                    .findViewById(R.id.textView);
            holder.checkBox = (CheckBox) convertView
                    .findViewById(R.id.checkBox1);
            holder.ivAppIcon = (ImageView) convertView
                    .findViewById(R.id.imageView);

            convertView.setTag(holder);
            // holder.ck1.setTag(packageList.get(position));

        } else {

            holder = (ViewHolder) convertView.getTag();
        }
        entry = mListAppInfo.get(position);

        holder.ivAppIcon.setImageDrawable(entry.loadIcon(mPackManager));
        holder.tvAppName.setText(entry.loadLabel(mPackManager));
        holder.tvPkgName.setText(entry.packageName);
        holder.checkBox.setChecked(false);

        if (itemChecked[position])
            holder.checkBox.setChecked(true);
        else
            holder.checkBox.setChecked(false);

        holder.checkBox.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                if (holder.checkBox.isChecked()) {
                    itemChecked[position] = true;
                    //   SharedPreferences preferences = mContext.getSharedPreferences("YOUR_APP_NAME", Context.MODE_PRIVATE);
                    // SharedPreferences.Editor edit = preferences.edit();
                    //  edit.putBoolean("checkbox_" + position, true);
                    //  edit.commit();
                    // editor.putBoolean("CheckBoxState" + position, true);
                } else {
                    itemChecked[position] = false;
                    // editor.putBoolean("CheckBoxState" + position, false);
                    //  SharedPreferences preferences = mContext.getSharedPreferences("YOUR_APP_NAME", Context.MODE_PRIVATE);
                    // SharedPreferences.Editor edit = preferences.edit();
                    //  edit.putBoolean("checkbox_" + position, false);
                    // edit.commit();
                }
            }
        });
        return convertView;
    }
    public void setItemChecked5(boolean[] items5) {
        itemChecked = items5;
    }

    private class ViewHolder
    {
        ImageView ivAppIcon;
        TextView tvAppName;
        TextView tvPkgName;
        CheckBox checkBox;
    }
}

这是活动代码

public class Profile5Activity extends Activity implements AdapterView.OnItemClickListener {
ListView apps5;
        PackageManager packageManager5;
        ArrayList<String> checkedValue5;
        Button bt5;
        ApplicationInfo pi5 = new ApplicationInfo();
        Context context = this;
        static String currentApp5 = "NULL";
        CheckBox cb5;
        Listadapter Adapter5 = null;
        boolean[] itemChecked5;
        //static String currentApp5;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_profile5);
 itemChecked5 = new boolean[AllApps.getInstalledApplication(this).size()];
        //needPermissionForBlocking(MainActivity.mainContext);

        SharedPreferences preferencess2 = context.getSharedPreferences("YOUR_APP_NAME5", Context.MODE_PRIVATE);
        Set<String> seta = preferencess2.getStringSet("pkgname5", null);
        if (seta != null && !seta.isEmpty() && !seta.equals("null")) {
            checkedValue5 = new ArrayList<String>(seta);
        }
        else
        {
            checkedValue5 = new ArrayList<String>();
        }
        // bt1 = (Button) findViewById(R.id.button1);
        apps5 = (ListView) findViewById(R.id.listViewm);
        apps5.setChoiceMode(ListView.CHOICE_MODE_SINGLE);

        packageManager5 = getPackageManager();

        List<String> list = new ArrayList<String>();

        final boolean[] items5 = new boolean[AllApps.getInstalledApplication(this).size()];

        SharedPreferences preferences5 = context.getSharedPreferences("YOUR_APP_NAME5", Context.MODE_PRIVATE);
        for (int i = 0; i < AllApps.getInstalledApplication(this).size(); ++i) {
            items5[i] = preferences5.getBoolean("checkbox_5" + i, false);
        }

        Adapter5 = new Listadapter(this, AllApps.getInstalledApplication(this), packageManager5);
        Adapter5.setItemChecked5(items5);
        apps5.setAdapter(Adapter5);
        apps5.setOnItemClickListener(this);


    }
@Override
    public void onItemClick(AdapterView<?> arg0, View v, int position, long arg3)
    {
        // TODO Auto-generated method stub
        cb5 = (CheckBox) v.findViewById(R.id.checkBox1);
        TextView tv5 = (TextView) v.findViewById(R.id.textView);
        pi5 = (ApplicationInfo) arg0.getItemAtPosition(position);
        cb5.performClick();

        if (cb5.isChecked()) {
            checkedValue5.add(tv5.getText().toString());
            itemChecked5[position] = true;
            String pname = (tv5.getText().toString());
            // Toast.makeText(MainActivity.this, "all" + position, Toast.LENGTH_LONG).show();
            SharedPreferences preferences1 = context.getSharedPreferences("YOUR_APP_NAME5", Context.MODE_PRIVATE);
            SharedPreferences.Editor edit = preferences1.edit();
            Set<String> setttt1 = new HashSet<String>();
            setttt1.addAll(checkedValue5);
            edit.putBoolean("checkbox_5" + position, true);
            edit.putStringSet("pkgname5", setttt1);
            edit.commit();

        } else if (!cb5.isChecked()) {
            checkedValue5.remove(tv5.getText().toString());
            String pname = (tv5.getText().toString());
            SharedPreferences preferences1 = context.getSharedPreferences("YOUR_APP_NAME5", Context.MODE_PRIVATE);
            SharedPreferences.Editor edit = preferences1.edit();
            Set<String> setttt1 = new HashSet<String>();
            setttt1.addAll(checkedValue5);
            edit.putBoolean("checkbox_5" + position, false);
            edit.putStringSet("pkgname5", setttt1);
            edit.commit();
        }
    }