Question

我正在使用app，它有多个清单，用户可以从中选择项目，这些项目是从SQLite生成的。
我已经使用了以下内容，但它只是给了我选中的字符串。

这是我的Product.java

list = (ListView)findViewById(android.R.id.list);
        list.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);


          ArrayList<String> results = new ArrayList<String>();

            try {
                sampleDB =  this.openOrCreateDatabase(SAMPLE_DB_NAME, MODE_PRIVATE, null);

                sampleDB.execSQL("CREATE TABLE IF NOT EXISTS " +
                        SAMPLE_TABLE_NAMES +
                        " (_id INTEGER PRIMARY KEY AUTOINCREMENT, pro_name text);");
                sampleDB.execSQL("INSERT INTO " +
                        SAMPLE_TABLE_NAMES +
                        " Values ('1','Milk');");
                sampleDB.execSQL("INSERT INTO " +
                        SAMPLE_TABLE_NAMES +
                        " Values ('2','Sugar');");
                sampleDB.execSQL("INSERT INTO " +
                        SAMPLE_TABLE_NAMES +
                        " Values ('3','Oil');");
            }
            finally{
                if (sampleDB != null) 
                    sampleDB.execSQL("DELETE FROM " + SAMPLE_TABLE_NAMES);
                    sampleDB.close();
            }
        setListAdapter(new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_checked, new ArrayList()));

        new AddStringTask().execute();
    }

    class AddStringTask extends AsyncTask<Void, String, Void> {
        @Override
        protected Void doInBackground(Void... unused) {
            for (String item : items) {
                publishProgress(item);
                SystemClock.sleep(100);
            }

            return (null);
        }

        @Override
        protected void onProgressUpdate(String... item) {
            ((ArrayAdapter) getListAdapter()).add(item[0]);
        }

        @Override
        protected void onPostExecute(Void unused) {
            setSelection(3);
            Toast.makeText(Product.this, "Done!", Toast.LENGTH_SHORT).show();
        }
    }

    @Override
    protected void onListItemClick(ListView l, View v, int position, long id) {
        CheckedTextView check = (CheckedTextView) v;
        check.setChecked(!check.isChecked());
         String selection = l.getItemAtPosition(position).toString();
         Toast.makeText(this, selection, Toast.LENGTH_SHORT).show();
        if(check.isChecked())
        {
            Toast.makeText(Product.this, "Item are Checked!", Toast.LENGTH_SHORT).show();
        }
        if(!check.isChecked()&&!check.isChecked())
        {
            Toast.makeText(Product.this, "Item are not checked!", Toast.LENGTH_SHORT).show();
        }
    }


    public View getView(final int position, View convertView, ViewGroup parent) 
    {
        cursor.moveToPosition(position);
        LayoutInflater inf=getLayoutInflater();
        vi=inf.inflate(R.layout.total, null);
        vi.setTag(cursor.getInt(0));
        return vi;
    }

这是Final.java

setContentView(R.layout.total);
        txtEmps=(TextView)findViewById(R.id.txtEmps);
        txtPro=(TextView)findViewById(R.id.txtPro);
        list = (ListView)findViewById(android.R.id.list);

        startPKCounter();
        }
    @Override
    protected void onStart() {
        // TODO Auto-generated method stub

        try{

            dbHelper=new DatabaseHelper(this);
                        txtEmps.setText(txtEmps.getText()+String.valueOf(dbHelper.getEmployeeCount()));
            }
        finally
            {
            }
        super.onStart();
    }
    private void startPKCounter() {
        // TODO Auto-generated method stub
        Toast.makeText(this, "Counted", Toast.LENGTH_SHORT).show();
    }

    protected void onListItemClick(ListView l, View v, int position, long id) 
    {
        int primaryValue= (int)v.getTag(cursor);
        Toast.makeText(Final.this, primaryValue+"", Toast.LENGTH_SHORT).show(); 
    }

它在v.getTag（）上给我错误。

Answer 1

protected void onListItemClick(ListView l, View v, int position, long id)

请参阅那里的long id部分？（id）是您单击的列表项的主键。

主键select从选项列表中选择

1 个答案: