如何在微调器中获取元素的位置或索引答案

【问题标题】：how to get position or index of element in spinner如何在微调器中获取元素的位置或索引
【发布时间】：2014-04-15 08:34:24
【问题描述】：

我的代码中有一个微调器，我想在选择时获取元素在数组中的位置。这是我运行良好的代码。在选择中我存储元素的字符串值，但我也想要元素的位置计数

public class MainActivity extends Activity implements OnItemSelectedListener {
    final Context context = this;
    private Button button;
    private String selection;
    private String[] states  = new String[]{
            "Gujrat","Jammu and Kashmir","Kerala","Karnataka","Lakshadweep","Maharashtra","Manipur","Mizoram",
            "Nagaland","New Delhi","Rajasthan","Tami Nadu","West Bengal"
    };
    ArrayList<String> categoryList = new ArrayList<String>();
    private static final String TAG = "MyActivity";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        int currentMonth = Calendar.getInstance().get(Calendar.MONTH)+1;

        //make it fullscreen
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);

        //fix portrait orientation
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

        setContentView(R.layout.activity_main);
        ImageView img = (ImageView)findViewById(R.id.imageView1);
        img.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {

                // custom dialog
                final Dialog dialog = new Dialog(MainActivity.this);
                dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
                dialog.setContentView(R.layout.menu);
                Button dialogButton = (Button) dialog.findViewById(R.id.btncross);
                // if button is clicked, close the custom dialog
                dialogButton.setOnClickListener(new OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        dialog.dismiss();
                    }
                });

                dialog.show();
                Spinner spin = (Spinner)dialog.findViewById(R.id.spinState);
                ArrayAdapter<String> adapter_state = new ArrayAdapter<String>(MainActivity.this,  android.R.layout.simple_spinner_item, states);
                adapter_state.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                spin.setAdapter(adapter_state);

                spin.setOnItemSelectedListener(MainActivity.this);
            }
        });



    }
    @Override
    public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
                               long arg3) {
        // TODO Auto-generated method stub
        TextView tv = (TextView)arg1;
        selection = tv.getText().toString();
        Log.v(TAG, "index=" + selection);

    }
    @Override
    public void onNothingSelected(AdapterView<?> arg0) {
        // TODO Auto-generated method stub

    }

}

【问题讨论】：

在您的 onItemSelected 方法中，arg2 是数组中的索引。考虑重命名参数，即 arg0 -> pAdapter、arg1 -> pV、arg2 -> pPosition、arg3 -> pId。希望这会有所帮助。

标签： android spinner onitemselectedlistener

【解决方案1】：

在代码中：

@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
                           long arg3) {
    // TODO Auto-generated method stub
    TextView tv = (TextView)arg1;
    selection = tv.getText().toString();
    Log.v(TAG, "index=" + selection);

}

arg2是微调器的位置

【讨论】：

【解决方案2】：

int arg2 of `onItemSelected()` is the position of selected items.

所以你可以像使用它一样

@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
                           long arg3) {
    // TODO Auto-generated method stub

    selection = states[arg2];
    Log.v(TAG, "index=" + arg2);
    Log.v(TAG, "selction=" + selection);

}

【讨论】：

【解决方案3】：

spin.getSelectedItemPosition();

【讨论】：

【解决方案4】：

在你的setOnItemSelectedListener(new OnItemSelectedListener()这里

public abstract void onItemSelected (AdapterView<?> parent, View view, int position, long id)

参数

parent发生选择的AdapterView
viewAdapterView中被点击的view
位置视图在适配器中的位置
id被选中项目的行id

【讨论】：

【解决方案5】：

int arg2 获取Selected Item Id

只更新这个方法，

@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
    // TODO Auto-generated method stub
    Log.v(TAG, "index=" + spin.getItemIdAtPosition(int2));
}

【讨论】：