如果调用按钮 Spinner 不能正常运行

使用的下面的代码：

String[] spinnerPresets = { "Test", "Test1", "Test2" };
        final Spinner s1 = new Spinner(this);
        ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_dropdown_item_1line, spinnerPresets);
        s1.setAdapter(arrayAdapter);
        s1.setPrompt("Presets");
        s1.setOnItemSelectedListener(
                new OnItemSelectedListener() {
                    public void onItemSelected(AdapterView<?> arg0, View arg1,
                            int position, long arg3) {  
                        if(position==0) {
                            Toast.makeText(Activity.this, "TEST", Toast.LENGTH_LONG).show();
                        }
                        if(position==1) {
                            Toast.makeText(Activity.this, "TEST1", Toast.LENGTH_LONG).show();
                        }
                        if(position==2) {
                            Toast.makeText(Activity.this, "TEST2", Toast.LENGTH_LONG).show();
                        }
                    }

                    public void onNothingSelected(AdapterView<?> arg0) {
                    }
                });
        b2.setOnClickListener(new OnClickListener() {
            public void onClick(View paramView) {
                s1.performClick();
            }
        });

当我点击按钮时，会显示spinner，但是当我选择 spinner 中的选项时，就不会显示Toast信息。

你看看这个方法行不?

s1.setOnTouchListener(new OnTouchListener() { 
int positon;     
            public boolean onTouch(View v, MotionEvent event) {

          positon = s1.getSelectedItemPosition();

                        if(position==0) {
                                Toast.makeText(Activity.this, "TEST", Toast.LENGTH_LONG).show();
                            }
                        if(position==1) {
                            Toast.makeText(Activity.this, "TEST1", Toast.LENGTH_LONG).show();
                        }
                        if(position==2) {
                            Toast.makeText(Activity.this, "TEST2", Toast.LENGTH_LONG).show();
                        }
                }
  }
    });