android - 在android中设置微调器位置

Question

我将 MaterialBetterSpinner 库用于微调器，但无法设置到指定位置。

String[] LIST = {"Item1", "Item2", "Item3", "Item4", "Item5"};

MaterialBetterSpinner spinnerItem = (MaterialBetterSpinner) findViewById(R.id.spinnerItem);

ArrayAdapter<String> adapter1 = new ArrayAdapter<String>(this, android.R.layout.simple_dropdown_item_1line, LIST);

String str = "Item3";
for(int i=0; i < adapter1.getCount(); i++) {
    if(str.trim().equals(adapter1.getItem(i).toString())){
        spinnerItem.setSelection(i);
        break;
    }
}

我得到以下异常

Caused by: java.lang.IndexOutOfBoundsException: setSpan (1 ... 1) ends beyond length 0

Answer 1

根据这个issue解决方案是使用 getText()

因此，您可以使用默认值来执行此操作

     String[] LIST = {"Item1", "Item2", "Item3", "Item4", "Item5"};

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
                android.R.layout.simple_dropdown_item_1line, LIST);

        spinner1.setAdapter(adapter);
        spinner2.setAdapter(adapter);


        String str = "Item3";
        for(int i=0; i < adapter.getCount(); i++) {
            if(str.trim().equals(adapter.getItem(i).toString())){
                spinner2.setText(adapter.getItem(i).toString());
                break;
            }
        }