Question

这很简单。我只想在不使用。Strings且不使用Spinner文件夹的情况下将xml添加到Resources。

我使用了onCreateOptionsMenu(Menu menu)，但我找不到解决问题的方法。

我见过 How can I add items to a spinner in Android? ，但在我的情况下它不起作用......

这是我的代码：

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.action_bar3, menu);
    setTitle("");

    String[] arraySpinner = new String[] {
            "1", "2", "3", "4", "5"
    };
    Spinner s = (Spinner) findViewById(R.id.spinner);
    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,R.array.spinner_values);
    s.setAdapter(adapter);

    return true;
}

注意：这段代码没有运行，因为我需要一种布局，但我不知道布局是什么......

Answer 1

更改为此ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, arraySpinner);

崩溃：java.lang.NullPointerException：尝试调用虚拟方法Line：s.setAdapter（adapter）;

在onCreate方法内初始化它们，而不是在onCreateOptionsMenu

中

 public class SpinnerExample extends Activity {    

      private String[] arraySpinner;

        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.main);

            this.arraySpinner = new String[] {
                "1", "2", "3", "4", "5"
            };
            Spinner s = (Spinner) findViewById(R.id.spinner);
            ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
                    android.R.layout.simple_spinner_item, arraySpinner);
            s.setAdapter(adapter);
        }
    }

Answer 2

您可以像这样创建一个数组适配器：

ArrayAdapter aa = new
    ArrayAdapter(this, android.R.layout.simple_spinner_item, arraySpinner);

Answer 3

String categoryItem1 = "item1";
String categoryItem2 = "item2";
String categoryItem3 = "item3";
List<String> categories = new ArrayList<String>();
categories.add(categoryItem1);
categories.add(categoryItem2);
categories.add(categoryItem3);
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(getActivity(), R.layout.spinnner_item, categories);
// attaching data adapter to spinner
spinner.setAdapter(dataAdapter);

Answer 4

对于任何寻求Kotlin方法的人：

private fun setUpTranslateToSpinner() {
    val languages = listOf(
        "English",
        "German",
        "Russian",
        "Arabic",
        "Japanese",
        "Chinese"
    ).sorted()

    ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, languages).apply {
        setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item)
        translateToSpinner.adapter = this
    }

    translateToSpinner.onItemSelectedListener = object : AdapterView.OnItemSelectedListener {
        override fun onItemSelected(parent: AdapterView<*>?, view: View?, position: Int, id: Long) {
            val item = parent?.getItemAtPosition(position)
            item.let { Log.e(TAG, item.toString()) }
        }

        override fun onNothingSelected(parent: AdapterView<*>?) {

        }
    }
}

如何在没有.xml和Resources的情况下将字符串添加到微调器

4 个答案: