android - 为什么我的 toast 不起作用？

Question

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

    myspinner = (Spinner)findViewById(R.id.spinnertype);
    String provider = myspinner.getSelectedItem().toString();

    ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, type_arrays,R.layout.support_simple_spinner_dropdown_item);
    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    myspinner.setAdapter(adapter);

    myspinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

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

        @Override
        public void onNothingSelected(AdapterView<?> parent) {
        }
    });

}
 }

---

我尝试了不同种类的 toast ，但仍然没有出现。什么地方出了错？我查看了一些帖子，它说我不能将 onclicklistener 用于微调器

Answer 1

你试试这个，这可能对你有帮助

Toast.makeText(getApplicationContext(), "OnItemSelectedListener :" + parent.getItemAtPosition(pos).toString(), Toast.LENGTH_SHORT).show();

或

Toast.makeText(YourActivity.this, "OnItemSelectedListener :" + parent.getItemAtPosition(pos).toString(), Toast.LENGTH_SHORT).show();