android - 在循环中动态添加 Spinner

Question

我正在循环中添加 say 'n' 个微调器。但是当我运行我的代码时，只有最后添加的微调器是可见的。请在下面查看我的代码

Context context = this;
        ArrayList<ArrayList<String>> list = new ArrayList<ArrayList<String>>();

        ArrayList<String> hi = new ArrayList<String>();
        hi.add("Test 1");
        hi.add("Test 2");

        list.add(hi);

        ArrayList<String> hi1 = new ArrayList<String>();
        hi1.add("Test 3");
        hi1.add("Test 4");

        list.add(hi1);

        AlertDialog.Builder alert = new AlertDialog.Builder(context);

        alert.setTitle("Test App");
        alert.setMessage("Testing");


        for (int i = 0; i < 2; i++) {
            final Spinner spinner = (Spinner) layout
                    .findViewById(R.id.spinner1);
            ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
                    android.R.layout.simple_spinner_item, list.get(i));

            dataAdapter
                    .setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
            spinner.setAdapter(dataAdapter);
                    alert.setView(spinner); 
        }

        alert.show();

Answer 1

这是因为您在 for 中所做的一切循环正在搜索 Spinner在Activity ' 布局然后使用 setView AlertDialog 的方法添加它(此方法不会将 View 添加到其他 Views 已经存在，它只是替换它们)。如果要添加多个Spinner同样AlertDialog你应该这样做:

LinearLayout ll = new LinearLayout(this);
ll.setOrientation(LinearLayout.VERTICAL);
for (int i = 0; i < 2; i++) {
     Spinner spinner = new Spinner(this);
     ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
                   android.R.layout.simple_spinner_item, list.get(i));
     dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
     spinner.setAdapter(dataAdapter);
     LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
     ll.addView(spinner, params);
}
alert.setView(ll); 

编辑:您可以使用适当的布局管理器添加更多 View 。例如，对于 TextView和一个 Spinner在同一行你可以使用 TableLayout :

    TableLayout tl = new TableLayout(this);
    for (int i = 0; i < 2; i++) {
        TableRow tr = new TableRow(this);
        TextView t = new TextView(this);
        t.setText("Text " + i);
        TableRow.LayoutParams params1 = new TableRow.LayoutParams(
                TableRow.LayoutParams.WRAP_CONTENT,
                TableRow.LayoutParams.WRAP_CONTENT);
        tr.addView(t, params1);
        Spinner spinner = new Spinner(this);
        ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
                android.R.layout.simple_spinner_item, list.get(i));
        dataAdapter
                .setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spinner.setAdapter(dataAdapter);
        TableRow.LayoutParams params2 = new TableRow.LayoutParams(
                TableRow.LayoutParams.FILL_PARENT,
                TableRow.LayoutParams.WRAP_CONTENT);
        tr.addView(spinner, params2);
        TableLayout.LayoutParams trParams = new TableLayout.LayoutParams(
                TableLayout.LayoutParams.FILL_PARENT,
                TableLayout.LayoutParams.WRAP_CONTENT);
        tl.addView(tr, trParams);
    }
    alert.setView(tl);