到目前为止我有这个代码。模型微调器根据用户为制造商选择的内容自动填充。 （对于下面的代码，我只为宝马设置了它）。是否有任何方法可以根据制造商和型号填充第三个微调器（颜色）。
因此，如果您在第一个微调器上选择BMW，然后为第二个微调器选择M3 coupe，则第三个微调器将显示M3_Color阵列中的所有选项。
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
public class MainActivity extends Activity implements OnItemSelectedListener {
private String[] Manufacture { "Ford",
"BMW",
"Nissan",
"Toyota",
"Chevy",
};
private String[] BMW_Model = { "128i Coupe",
"M3 Coupe",
"M5 Sedan",
"640i Gran Coupe",
"335i Coupe",
};
private String[] M3_Color = { "Jerez Black Metallic",
"Melbourne Red Metallic",
"Mineral White Metallic",
"Le Mans Blue Metallic",
};
Spinner spinnerManufacture, spinnerModel, spinnerColor;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
spinnerManufacture = (Spinner) findViewById(R.id.manufacture_spinner);
ArrayAdapter<String> MaufactureAdapter = new ArrayAdapter<String> (this, android.R.layout.simple_spinner_item,Manufacture);
MaufactureAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinnerManufacture.setAdapter(MaufactureAdapter);
spinnerManufacture.setOnItemSelectedListener(this);
}
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position,long id) {
// TODO Auto-generated method stub
{
if(parent.getId() == R.id.maufacture_spinner && position == 1)
{
spinnerModel = (Spinner) findViewById(R.id.model_spinner);
ArrayAdapter<String> ModelAdapter = new ArrayAdapter<String> (this, android.R.layout.simple_spinner_item, BMW_Model);
ModelAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinnerModel.setAdapter(ModelAdapter);
if(parent.getId() == R.id.model_spinner)
{
String[] Color;
if(spinnerMaufacture.getSelectedItem().toString.equals("BMW"))
{
if(spinnerModel.getSelectedItem().toString.equals("M3 Coupe))
{
Color = M3_Color
}
}
spinnerColor = (Spinner) findViewById(R.id.color_spinner);
ArrayAdapter<String> ColorAdapter = new ArrayAdapter<String> (this, android.R.layout.simple_spinner_item, M3_Color);
ColorAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinnerColor.setAdapter(ColorAdapter);
}
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
}
答案 0 :(得分：2)
您需要将if(parent.getId() == R.id.model_spinner)移到if(parent.getId() == R.id.maufacture_spinner之外，然后调整并调用spinnerModel.setOnItemSelectedListener(this) onCreate，为此，您需要将spinnerModel = (Spinner) findViewById(R.id.model_spinner)移至您的创建中，我建议对所有视图执行相同操作，这样每次选择微调项时都不会调用findViewById。
编辑：
Spinner spinnerManufacture, spinnerModel, spinnerColor;
private ArrayAdapter<String> modelAdapter;
private ArrayAdapter<String> maufactureAdapter;
private ArrayAdapter<String> colorAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
spinnerManufacture = (Spinner) findViewById(R.id.manufacture_spinner);
spinnerModel = (Spinner) findViewById(R.id.model_spinner);
spinnerColor = (Spinner) findViewById(R.id.color_spinner);
maufactureAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, Manufacture);
modelAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item);
colorAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item);
maufactureAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
modelAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
colorAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinnerColor.setAdapter(colorAdapter);
spinnerManufacture.setAdapter(maufactureAdapter);
spinnerModel.setAdapter(modelAdapter);
spinnerManufacture.setOnItemSelectedListener(this);
spinnerModel.setOnItemSelectedListener(this);
spinnerColor.setOnItemSelectedListener(this);
}
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
if (parent.getId() == R.id.maufacture_spinner) {
String[] model;
if (spinnerManufacture.getSelectedItem().toString().equals("BMW")){
model = BMW_Model;
} else {
model = new String[] {"not sure what model list to use"};
}
modelAdapter.clear();
modelAdapter.addAll(model);
}
if (parent.getId() == R.id.model_spinner) {
String[] Color;
if (spinnerModel.getSelectedItem().toString().equals("M3 Coupe")) {
Color = M3_Color;
} else if (spinnerModel.getSelectedItem().toString().equals("M5 Sedan")) {
Color = M5_Color;
} else {
Color = new String[] { "not sure what color list to use" };
}
colorAdapter.clear();
colorAdapter.addAll(Color);
}
}
这是我建议您尝试的。
答案 1 :(得分：0)
根据下面选择的内容构建字符串。这将颜色列表设置为选择BMW和M3 Coupe的M3_Color，以及选择BMW和M5 Sedan时的M5_Color。这需要针对所有可能的组合进行。
if(parent.getId() == R.id.model_spinner)
{
String[] Color = new String[];
if(spinnerManufacture.getSelectedItem().toString().equals("BMW"))
{
if(spinnerModel.getSelectedItem().toString().equals("M3 Coupe"))
{
Color = M3_Color;
}
else if(spinnerModel.getSelectedItem().toString().equals("M5 Sedan"))
{
Color = M5_Color;
}
}
spinnerColor = (Spinner) findViewById(R.id.color_spinner);
ArrayAdapter<String> ColorAdapter = new ArrayAdapter<String> (this, android.R.layout.simple_spinner_item, Color);
ColorAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinnerColor.setAdapter(ColorAdapter);
}