AlertDialog 中的 ListView

我們總是可以使用 ListViewRecyclerView 從專案列表中進行選擇,但如果我們有少量選擇,我們希望使用者選擇一個,我們可以使用 AlertDialog.Builder setAdapter

    private void showDialog()
    {
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("Choose any item");

        final List<String> lables = new ArrayList<>();
        lables.add("Item 1");
        lables.add("Item 2");
        lables.add("Item 3");
        lables.add("Item 4");

        ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
            android.R.layout.simple_dropdown_item_1line, lables);
        builder.setAdapter(dataAdapter, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                Toast.makeText(MainActivity.this,"You have selected " + lables.get(which),Toast.LENGTH_LONG).show();
            }
        });
        AlertDialog dialog = builder.create();
        dialog.show();
    }

也許,如果我們不需要任何特定的 ListView,我們可以使用一種基本的方式:

AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Select an item")
       .setItems(R.array.your_array, new DialogInterface.OnClickListener() {
           public void onClick(DialogInterface dialog, int which) {
               // The 'which' argument contains the index position of the selected item
               Log.v(TAG, "Selected item on position " + which);
           }
        });
builder.create().show();