我遇到了问题，findViewById但我找不到问题出在哪里。
这是我的 FirstFragment 类代码：
public class VehicleInformation extends Fragment implements AdapterView.OnItemSelectedListener {
private TextView text_vehicle_no, text_chassis_no;
private TextView text_company_name,text_insurance_id;
RadioGroup radioGroup;
RadioButton radioButton;
private SpinnerAdapter text_vehicle_class;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_vehicle_information, container, false);
return rootView;
radioGroup = (RadioGroup) rootView.findViewById(R.id.insuranceYesNo);
text_vehicle_no = (TextView) rootView.findViewById(R.id.vehicle_no);
text_chassis_no = (TextView) rootView.findViewById(R.id.chassis_no);
Spinner spinner_vehicle_class = (Spinner) rootView.findViewById(R.id.vehicle_class);
Spinner spinner_vehicle_company = (Spinner) rootView.findViewById(R.id.vehicle_company);
Spinner spinner_vehicle_model = (Spinner) rootView.findViewById(R.id.vehicle_model);
Spinner spinner_vehicle_fuel = (Spinner) rootView.findViewById(R.id.vehicle_fuel);
Spinner spinner_vehicle_color = (Spinner) rootView.findViewById(R.id.vehicle_color);
Spinner spinner_vehicle_types = (Spinner) rootView.findViewById(R.id.vehicle_types);
ArrayAdapter adapter = ArrayAdapter.createFromResource(this,R.array.vehicle_class_array, android.R.layout.simple_spinner_item);
ArrayAdapter adapter1 = ArrayAdapter.createFromResource(this,R.array.vehicle_company_array, android.R.layout.simple_spinner_item);
ArrayAdapter adapter2 = ArrayAdapter.createFromResource(this,R.array.vehicle_model_array, android.R.layout.simple_spinner_item);
ArrayAdapter adapter3 = ArrayAdapter.createFromResource(this,R.array.vehicle_fuel_array, android.R.layout.simple_spinner_item);
ArrayAdapter adapter4 = ArrayAdapter.createFromResource(this,R.array.vehicle_color_array, android.R.layout.simple_spinner_item);
ArrayAdapter adapter7 = ArrayAdapter.createFromResource(this,R.array.vehicle_type_array, android.R.layout.simple_spinner_item);
//specify the layout to use when the list of choices appears
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
adapter1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
adapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
adapter3.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
adapter4.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
adapter7.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
//aaply the adapter to the spinner
spinner_vehicle_class.setAdapter(adapter);
spinner_vehicle_company.setAdapter(adapter1);
spinner_vehicle_model.setAdapter(adapter2);
spinner_vehicle_fuel.setAdapter(adapter3);
spinner_vehicle_color.setAdapter(adapter4);
spinner_vehicle_types.setAdapter(adapter7);
spinner_vehicle_class.setOnItemSelectedListener(this);
spinner_vehicle_company.setOnItemSelectedListener(this);
spinner_vehicle_model.setOnItemSelectedListener(this);
spinner_vehicle_fuel.setOnItemSelectedListener(this);
spinner_vehicle_color.setOnItemSelectedListener(this);
spinner_vehicle_types.setOnItemSelectedListener(this);
}
public void onStart(){
super.onStart();
EditText datePicker=(EditText) findViewById(R.id.datePicker);
datePicker.setOnFocusChangeListener(new View.OnFocusChangeListener(){
public void onFocusChange(View view, boolean hasfocus){
if(hasfocus){
DateDialog dialog=new DateDialog(view);
android.support.v4.app.FragmentTransaction ft =getFragmentManager().beginTransaction();
dialog.show(ft, "DatePicker");
}
}
});
}
public void radiobtn(View view) {
int radiobtnselect = radioGroup.getCheckedRadioButtonId();
radioButton = (RadioButton) view.findViewById(radiobtnselect);
Toast.makeText(VehicleInformation.this, radioButton.getText(), Toast.LENGTH_SHORT).show();
}
@Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
String sSelected=adapterView.getItemAtPosition(i).toString();
Toast.makeText(VehicleInformation.this,sSelected,Toast.LENGTH_SHORT).show();
}
@Override
public void onNothingSelected(AdapterView<?> adapterView) {
}
}
还在线显示错误
ArrayAdapter adapter = ArrayAdapter.createFromResource(this,R.array.vehicle_class_array, android.R.layout.simple_spinner_item);"
说错误的第一个参数类型
还在线上显示错误 Toast 消息说无法解析方法 maketext
与Activity类不同，Fragment它没有内置findViewById()方法。这意味着您需要使用View.findViewById()，除了在您的onStart()方法中，您已经在任何地方使用它。在这里，您可以更改此行：
EditText datePicker=(EditText) findViewById(R.id.datePicker);
对此：
EditText datePicker=(EditText) getView().findViewById(R.id.datePicker);
至于您的适配器和吐司问题，问题在于（同样，与 不同Activity），Fragment该类不是 的子类Context，因此您需要传递不同的第一个参数。尝试通过getContext()而不是VehicleInformation.this.
本文收集自互联网，转载请注明来源。
如有侵权，请联系[email protected] 删除。
我来说两句