如何在一个listview中显示两个List和ArrayList？

Question

我有一个ApplicationInfo类型的列表和另一个String类型的ArrayList。我想在listView中列出这两者。我可以将ArrayAdapter（ApplicationInfo）和Array适配器（String）扩展到ApplicationAdapter吗。班这是我当前的代码，只显示ApplicationInfo。

ApplicationAdapter.class

public class ApplicationAdapter extends ArrayAdapter<ApplicationInfo> {

    private List<ApplicationInfo> appsList = null;
    private Context context;
    private PackageManager packageManager;
    public ImageView addview;

    public ApplicationAdapter(Context context, int textViewResourceId, List<ApplicationInfo> appsList) {
        super(context, textViewResourceId, appsList);
        this.context = context;
        this.appsList = 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_paackage);
            ImageView iconview = (ImageView) view.findViewById(R.id.app_icon);
            addview = (ImageView) view.findViewById(R.id.add_icon);

            appName.setText(data.loadLabel(packageManager));
            packageName.setText(data.packageName);
            iconview.setImageDrawable(data.loadIcon(packageManager));
            addview.setImageResource(R.drawable.ads);

        }
        return view;
    }

}

所有应用程序活动.class

public class AllAppsActivity extends ListActivity implements Serializable {

    private PackageManager packageManager = null;
    private List<ApplicationInfo> applist = null;
    private ApplicationAdapter listadaptor = null;
    public ImageView addview;
    public ArrayList<String> addblock_list;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mboolean = false;

        addblock_list = new ArrayList<String>(100);

        for(int i = 0; i < 100; i= i + 1) {
            addblock_list.add("addblock");
        }
    }

    @Override
    protected void onResume() {
        packageManager = getPackageManager();

        new LoadApplications().execute();
        super.onResume();
    }

    @Override
    protected void onListItemClick(ListView l, View v, int position, long id) {
        super.onListItemClick(l, v, position, id);

        addview = (ImageView) v.findViewById(R.id.add_icon);

        ApplicationInfo app = applist.get(position);

        if(addblock_list.get(position).equals(app.packageName)) {
            addview.setImageResource(R.drawable.ads);
            addblock_list.set(position, "addblock");

            Toast.makeText(AllAppsActivity.this, "removed "+app.packageName,Toast.LENGTH_SHORT).show();
        } else {
            addview.setImageResource(R.drawable.adsblock);
            addblock_list.set(position, app.packageName);

            Toast.makeText(AllAppsActivity.this, "added "+app.packageName,Toast.LENGTH_SHORT).show();
        }
    }

    private List<ApplicationInfo> checkForLaunchIntent(List<ApplicationInfo> list) {
        ArrayList<ApplicationInfo> applist = new ArrayList<ApplicationInfo>();
        for (ApplicationInfo info : list) {
            try {
                if (null != packageManager.getLaunchIntentForPackage(info.packageName)) {
                    applist.add(info);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

        return applist;
    }

    private class LoadApplications extends AsyncTask<Void, Void, Void> {

        private ProgressDialog progress = null;

        @Override
        protected Void doInBackground(Void... params) {
            applist = checkForLaunchIntent(packageManager.getInstalledApplications(PackageManager.GET_META_DATA));
            listadaptor = new ApplicationAdapter(AllAppsActivity.this, R.layout.snippet_list_row, applist);
            return null;
        }

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

        @Override
        protected void onPostExecute(Void result) {
            setListAdapter(listadaptor);

            progress.dismiss();
            super.onPostExecute(result);
        }

        @Override
        protected void onPreExecute() {
            progress = ProgressDialog.show(AllAppsActivity.this, null, "Loading application info...");
            super.onPreExecute();
        }

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

    }

}

我检查了互联网，我想我必须使用类似的东西：

我在AllAppsActivity Class中更改了我的代码，如下所示

    @Override
    protected Void doInBackground(Void... params) {
        applist = checkForLaunchIntent( packageManager.getInstalledApplications(PackageManager.GET_META_DATA));
        HashMap<Integer,Object> yourHash = new HashMap<Integer,Object>();
        yourHash.put(1,applist);
        yourHash.put(2,addblock_list);
        listadaptor = new ApplicationAdapter(AllAppsActivity.this,
                R.layout.snippet_list_row,yourHash);
        return null;



    }

@Override
    protected void onPostExecute(Void result) {
        setListAdapter(listadaptor);
        progress.dismiss();
        super.onPostExecute(result);
    }

我的应用程序适配器. class

public class ApplicationAdapter extends ArrayAdapter<HashMap<Integer,Object>>{

private List<ApplicationInfo> appsList = null;
private Context context;
private PackageManager packageManager;
public ImageView addview;
private ArrayList<String> addblock_list;
private HashMap<Integer,Object> yourHash;



public ApplicationAdapter(Context context, int textViewResourceId,
        HashMap<Integer,Object> yourHash) {
    // TODO Auto-generated constructor stub
    super(context,textViewResourceId);

    this.context = context;
    this.yourHash = yourHash;
    packageManager = context.getPackageManager();


        List<ApplicationInfo> appsList = (List<ApplicationInfo> ) yourHash.get(1);
         ArrayList<String> addblock_list=( ArrayList<String> ) yourHash.get(2);




}


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

我是android和java的新手。

< li >当我有一个list和一个arrayList时，我定义HashMap(Integer，Object)合适吗？ < li >我不知道构造html" target="_blank">函数和super()？super不接受myHash参数。

请告诉我如何做，请告诉我如何做，把代码发给我。提前感谢。

Answer 1

哈希图是一种可以保存不同对象的容器，按标签排序。您可以在静态类上设置该哈希图以从任何地方访问它或通过参数将其传递给您的适配器（推荐）。

看看官方文档：

http://developer . Android . com/reference/Java/util/hashmap . html

示例实现：

 // create an arrayList to store values
35
        ArrayList<String> listOne = new ArrayList<String>();
36
        listOne.add("Blue");
37
        listOne.add("Black");
38
        listOne.add("Brown");
39

40
        // create list two and store values
41
        ArrayList<String> listTwo = new ArrayList<String>();
42
        listTwo.add("Pink");
43
        listTwo.add("Purple");
44

45
        // put values into map
46
        multiMap.put("B color", listOne);
47
        multiMap.put("P color", listTwo);

在这里，您可以找到解决不同类型问题的类似问题：

Hashmap将不同的数据类型保存为整数、字符串和对象的值