java - 微调器无需等待查看器的选择即可加载 Intent

Question

当查看器从微调器中选择一个项目时，它应该启动一个新的 Intent 。

但应用程序会自动转到 Intent ，而无需等待选择。我认为 onNothingSelected 应该将应用程序保持在当前 Activity 上，直到用户做出选择。我该如何解决这个问题？

areaspinner.setOnItemSelectedListener(new OnItemSelectedListener() {

        public void onItemSelected(AdapterView<?> arg0, View arg1,
                int arg2, long arg3) {
            int item = areaspinner.getSelectedItemPosition();

                Bundle bundle = new Bundle();
                bundle.putInt("selection", item);

                   Intent myIntent = new Intent(patriosar.this, ShowXMLPAR.class);
                   myIntent.putExtras(bundle);
                   startActivityForResult(myIntent, 0);




        }

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

Answer 1

尝试这样做

private boolean mFirstSelect = true; //make this a field

areaspinner.setOnItemSelectedListener(new OnItemSelectedListener() {

        public void onItemSelected(AdapterView<?> arg0, View arg1,
                int arg2, long arg3) {
            if (mFirstSelect)
            {
                  mFirstSelect = false;
                  return;
            }
            int item = areaspinner.getSelectedItemPosition();

                Bundle bundle = new Bundle();
                bundle.putInt("selection", item);

                   Intent myIntent = new Intent(patriosar.this, ShowXMLPAR.class);
                   myIntent.putExtras(bundle);
                   startActivityForResult(myIntent, 0);




        }

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

当您设置值时，您选择的监听器将被触发。这将防止这种情况发生