android - 列表视图到 SQLite

Question

我创建了一个显示已安装应用程序的列表视图。它有应用程序图标 + 应用程序名称 + 复选框。我想从此列表中选择应用程序并将应用程序名称存储在 sqlite DB 中我应该如何开始？

喜欢如何识别选定的应用程序？

Answer 1

您需要制作一个自定义 listView 适配器。您可以使每个项目可选择，然后当用户选择应用程序时，您可以调用代码将其插入数据库

Answer 2

这是我为我的一个应用程序制作的适配器。这是一个课堂考勤功能，显示学生的姓名、照片和几个复选框（一个用于这里，一个用于迟到）。该列表来自一个 SQlite 查询，但我需要对每个单击的复选框做一些事情。

public class MyDataAdapter extends SimpleCursorAdapter {
    private Cursor c;
    private Context context;
    private Long classnum;
    private gradeBookDbAdapter mDbHelper;

    public static final int LATE=2;
    public static final int ATTEND=1;
    int idxCol;
    int idx;

    // itemChecked will store the position of the checked items.

    public MyDataAdapter(Context context, int layout, Cursor c, String[] from,
            int[] to, Long mRowId) {
        super(context, layout, c, from, to);
        this.c = c;
        this.context = context;
        mDbHelper = new gradeBookDbAdapter(context);
        mDbHelper.open();
        classnum = mRowId;
        c.moveToFirst();



    }
    public class ViewHolder{
        public TextView text;
        public TextView text2;
        public ImageView image;
        public CheckBox here;
        public CheckBox late;
    }


    public View getView(final int pos, View inView, ViewGroup parent) {
        Bitmap bm;
        ImageView studentPhoto;
        View vi=inView;
        final ViewHolder holder;

        if (inView == null) {
            LayoutInflater inflater = (LayoutInflater) context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            vi = inflater.inflate(R.layout.show_attendance, null);

            holder=new ViewHolder();
            holder.text=(TextView)vi.findViewById(R.id.stuname);
            holder.text2=(TextView)vi.findViewById(R.id.stuIndex);
            holder.image=(ImageView)vi.findViewById(R.id.icon);
            holder.here=(CheckBox)vi.findViewById(R.id.attend);
            holder.late=(CheckBox)vi.findViewById(R.id.late);
            vi.setTag(holder);

        }
        else
           holder=(ViewHolder)vi.getTag();


        c.moveToPosition(pos);
        int index = c.getColumnIndex(gradeBookDbAdapter.KEY_NAME);
        String name = c.getString(index);
        holder.text.setText(name);
        index = c.getColumnIndex(gradeBookDbAdapter.KEY_ROWID); 
        String Index = c.getString(index);
        holder.text2.setText(Index);

        bm = gradeBookDbAdapter.getStudentPhoto(name);
        if (bm != null) {
            holder.image.setImageBitmap(bm);  
        }           
        else {
            // use icon image
            holder.image.setImageResource(R.drawable.person_icon);
        }


        // pull out existing attend/late fields and set accordingly
        int attend = c.getInt(c.getColumnIndex(gradeBookDbAdapter.KEY_ATTEND));
        if(attend==1){
           holder.here.setChecked(true);
           itemCheckedHere.set(pos, true);
        }
        //else {
        //   holder.here.setChecked(false);
        //   itemCheckedHere.set(pos, false);
        //}

        int late = c.getInt(c.getColumnIndex(gradeBookDbAdapter.KEY_LATE));
        if (late==1){
           holder.late.setChecked(true);
           itemCheckedLate.set(pos, true);
        }
        //else {
        //  holder.late.setChecked(false);
        //    itemCheckedLate.set(pos, false);
        //}




        holder.here.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {

                CheckBox cb = (CheckBox) v.findViewById(R.id.attend);

                if (cb.isChecked()) {
                    itemCheckedHere.set(pos, true); 
                    int Index = new Integer(holder.text2.getText().toString());
                    mDbHelper.updateAttend(Index, classnum, ATTEND, 1, attendDate ); 
                } else if (!cb.isChecked()) {
                    itemCheckedHere.set(pos, false);
                    int Index = new Integer(holder.text2.getText().toString());
                    mDbHelper.updateAttend(Index, classnum, ATTEND, 0, attendDate );
                }
            }
        });
        holder.late.setOnClickListener(new OnClickListener() {

           public void onClick(View v) {
                CheckBox cb = (CheckBox) v.findViewById(R.id.late);

                if (cb.isChecked()) {
                   itemCheckedLate.set(pos, true);
                   int Index = new Integer(holder.text2.getText().toString());
                   mDbHelper.updateAttend(Index, classnum, LATE, 1, attendDate );
                } else if (!cb.isChecked()) {
                   itemCheckedLate.set(pos, false);
                   int Index = new Integer(holder.text2.getText().toString());
                   mDbHelper.updateAttend(Index, classnum, LATE, 0, attendDate );
                }
            }
        });


        holder.here.setChecked(itemCheckedHere.get(pos)); // this will Check or Uncheck the
        holder.late.setChecked(itemCheckedLate.get(pos)); // this will Check or Uncheck the
        // CheckBox in ListView
        // according to their original
        // position and CheckBox never
        // loss his State when you
        // Scroll the List Items.

        return vi;
    }

}

请注意，我有两个稀疏数组“ItemCheckedHere”和“ItemCheckLate”。它们跟踪我选择了哪些项目。Android 不会跟踪并且会重用视图，因此滚动复选框列表将导致复选框被选中或没有这些我用来维持已检查状态的数组，似乎随机未检查。