Question

我有一个Spinner，我正在使用setAdapter更改每个项目点击的条目。我面临的问题是，在点击微调器时，无限期地调用setOnItemSelectedListener。您可以在下面的代码中看到，单击每个项目时将显示一个确认框，该对话框只会显示无限次。以下是我的代码

adapter_after_confirm = ArrayAdapter.createFromResource(this,
            R.array.spinner_after_confirmation,       android.R.layout.simple_spinner_item);
adapter_after_waiting = ArrayAdapter.createFromResource(this,
            R.array.spinner_after_waiting, android.R.layout.simple_spinner_item);
adapter_after_boarded = ArrayAdapter.createFromResource(this,
            R.array.spinner_after_boarded, android.R.layout.simple_spinner_item);
adapter_after_reached = ArrayAdapter.createFromResource(this,
            R.array.spinner_after_reached, android.R.layout.simple_spinner_item);
    // Specify the layout to use when the list of choices appears
adapter_after_confirm.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
adapter_after_waiting.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
adapter_after_boarded.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
adapter_after_reached.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

spinner.setOnItemSelectedListener(new OnItemSelectedListener() {

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

            String selected = parent.getItemAtPosition(position).toString();
            if(spinnerSelected){
                if(selected.equals("Waiting For Cab")){
                    confirmDialog("Waiting For Cab");
                    spinnerStatusChange.setAdapter(adapter_after_waiting);
                }

                else if(selected.equals("Boarded Cab")){
                    confirmDialog("Boarded Cab");
                    spinnerStatusChange.setAdapter(adapter_after_boarded);
                }

                else if(selected.equals("Reached Destination")){
                    confirmDialog("Boarded Cab");
                    spinnerStatusChange.setAdapter(adapter_after_reached);
                    spinnerStatusChange.setEnabled(false);
                    Toast.makeText(getApplicationContext(), 
                            "Location tracking is now disabled",
                            Toast.LENGTH_SHORT).show();
                }
            }

        }

    });

Answer 1

您不必使用“if（spinnerSelected）”，因为仅在选择微调器时调用methot。

试试这个：

adapter_after_confirm = ArrayAdapter.createFromResource(this,
        R.array.spinner_after_confirmation, android.R.layout.simple_spinner_item);
adapter_after_waiting = ArrayAdapter.createFromResource(this,
        R.array.spinner_after_waiting, android.R.layout.simple_spinner_item);
adapter_after_boarded = ArrayAdapter.createFromResource(this,
        R.array.spinner_after_boarded, android.R.layout.simple_spinner_item);
adapter_after_reached = ArrayAdapter.createFromResource(this,
        R.array.spinner_after_reached, android.R.layout.simple_spinner_item);
// Specify the layout to use when the list of choices appears

adapter_after_confirm.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
adapter_after_waiting.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
adapter_after_boarded.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
adapter_after_reached.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

spinner.setOnItemSelectedListener(new OnItemSelectedListener() {

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

        String selected = parent.getItemAtPosition(position).toString();

            if(selected.equals("Waiting For Cab")){
                confirmDialog("Waiting For Cab");
                spinnerStatusChange.setAdapter(adapter_after_waiting);
            }

            else if(selected.equals("Boarded Cab")){
                confirmDialog("Boarded Cab");
                spinnerStatusChange.setAdapter(adapter_after_boarded);
            }

            else if(selected.equals("Reached Destination")){
                confirmDialog("Boarded Cab");
                spinnerStatusChange.setAdapter(adapter_after_reached);
                spinnerStatusChange.setEnabled(false);
                Toast.makeText(getApplicationContext(), 
                        "Location tracking is now disabled",
                        Toast.LENGTH_SHORT).show();
            }


    }

});

Spinner onItemSelected无限调用

1 个答案: