Question

我非常接近让我的微调器在选择项目时做某事。我无法弄清楚如何正确设置onitemselectedlistener。我认为我的问题是不知道如何将参数传递给我的onItemSelected方法。非常感谢帮助完成这项工作的最后部分。

以下是代码：

public class MainActivity extends AppCompatActivity {



    Spinner spinner;
    String[][] testScoreList = new String[3][3];

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        //Load test scores into arraylist
        nameArrayListMethod();
        spinner.setOnItemSelectedListener(onItemSelected());


    }

    //This method loads test scores into an array and populates spinner
    public void nameArrayListMethod (){

        InputStreamReader InputSR = null;
        BufferedReader BufferedRdr = null;
        String thisLine = null;

        AssetManager am = getAssets();
        String[] SpinnerNames = new String[3];

        try {
            InputSR = new InputStreamReader(am.open("scoresdata/test_scores.txt"));
            BufferedRdr = new BufferedReader(InputSR);

            // open input stream test_scores for reading purpose.

            int i = 0;
            while ((thisLine = BufferedRdr.readLine()) != null) {
                 //System.out.println(thisLine);

                String[] parts = thisLine.split(" ");
                testScoreList[i][0] = parts[0];
                testScoreList[i][1] = parts[1];
                testScoreList[i][2] = parts[2];

                SpinnerNames[i] = testScoreList[i][0]; //Extract first column for spinner
                i = i +1;
            }
            BufferedRdr.close();
            InputSR.close();

        } catch (Exception e) {
            e.printStackTrace();

        }

        spinner= (Spinner) findViewById(R.id.spinner1);

        ArrayAdapter<String> spinnerArrayAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_dropdown_item, SpinnerNames);
        spinnerArrayAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spinner.setAdapter(spinnerArrayAdapter);

    }

    public void onItemSelected(AdapterView<?> parent, View view, int pos,long id) {
        Toast.makeText(parent.getContext(),
                "OnItemSelectedListener : " + parent.getItemAtPosition(pos).toString(),
                Toast.LENGTH_SHORT).show();
    }

}

Answer 1

看起来像：

spinner.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            Toast.makeText(parent.getContext(),
                    "OnItemSelectedListener : " + parent.getItemAtPosition(pos).toString(),
                    Toast.LENGTH_SHORT).show();
        }
    });

Answer 2

试试这个

{{1}}

Answer 3

您可以添加数据方式

方法1

如果您有一个简单的单行数据，请使用此方法。

第1步

在string.xml文件中添加字符串数组

 <string-array name="ArrayName">
        <item>A</item>
        <item>B</item>
        <item>C</item>
        <item>D</item>
        <item>E</item>
        <item>F</item>
    </string-array>

在xml微调器组件中添加 android:entries="@string/ArrayName"

并使用String text = spinner.getSelectedItem().toString();

获取所选值

Spinner.setOnItemSelectedListener(new OnItemSelectedListener() 
{
    @Override
    public void onItemSelected(AdapterView<?> parentView, View selectedItemView, int position, long id) 
    {
        Toast.makeText(topThis, "Value = "+spinner.getSelectedItem().toString();, Toast.LENGTH_LONG).show();
    }

    @Override
    public void onNothingSelected(AdapterView<?> parentView) 
    {
        Toast.makeText(topThis, "herf", Toast.LENGTH_LONG).show();
    }
});

方法2

使用自定义适配器HERE是完整的教程

调用Spinner onitemselect侦听器

3 个答案: