Question

我使用arrayadapter作为我的listview，我想在其中使用DownloadManager。但阵列适配器不知道这一行：

DownloadManager download =(DownloadManager) getSystemService(DOWNLOAD_SERVICE);

那么我怎样才能使用这个我的适配器类，当用户触摸图像下载开始时

我的适配器类：

public class MyAdapter extends ArrayAdapter<String>{

    private final Context context;
    private final String[] values;
    Context b;

    public MyAdapter(Context context, String[] values) {
        super(context, R.layout.item, values);
        this.context = context;
        this.values = values;
        b= (Context) context;
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);       
        View rootview = inflater.inflate(R.layout.item, parent, false);

        TextView tv1 = (TextView)rootview.findViewById(R.id.txt_name);
        TextView tv2 = (TextView)rootview.findViewById(R.id.txt_numer);
        ImageView img = (ImageView) rootview.findViewById(R.id.imageView1);

        MyDatabase MyDatabase = new MyDatabase(context);
        SQLiteDatabase mydb = MyDatabase.getReadableDatabase();
        Cursor cur = mydb.rawQuery("SELECT name,category,url FROM list WHERE id='"+values[position]+"'", null);
        if (cur != null) {
            cur.moveToFirst();}


        tv1.setText(cur.getString(cur.getColumnIndex("name")));     
        tv2.setText(cur.getString(cur.getColumnIndex("category")));


        return rootview;
    }

Answer 1

您还需要传递上下文：编辑：

DownloadManager download = (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE);

如何在ArrayAdapter中使用DownloadManager

1 个答案: