Question

我有一个ApplicationInfo类型的列表和另一个String类型的ArrayList。我想在listView中列出这两个。我可以将ArrayAdapter（ApplicationInfo）和ArrayAdapter（String）扩展到ApplicationAdapter.class吗？这是我当前的代码，仅显示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;
    }

}

AllAppsActivity.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

    @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ApplicationAdapter.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。

当我有一个列表和一个arrayList时，定义HashMap（整数，对象）是否合适？
我不知道构造函数和super（）？ super没有接受myHash论证？

请通过告诉我如何做到这一点来启发我，给我发送代码。在此先感谢。

Answer 1

hashmap是一种容器类型，可以保存不同的对象，按标记排序。你可以在静态类上设置hashmap，从任何地方访问它，或者通过参数将它传递给你的适配器（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);

在这里你可以找到解决不同类型问题的类似问题：

Hashmap holding different data types as values for instance Integer, String and Object

如何在列表视图中显示两个List <applicationinfo>和ArrayList <string>？</string> </applicationinfo>

1 个答案: