我正在为电子商务开发Android应用程序.我在一个活动中使用两个微调器，用于第一个微调器获取类别以json。它选择基于国家/地区的获取子类别来php json但我不知道这个概念如何实现这个概念，请帮助
public class ProductForm extends AppCompatActivity implements Spinner.OnItemSelectedListener {
Spinner prospin, prospin1;
EditText pdctname, pdctbrand, pdctmodel, pdctdiscount, pdctdisvalidity, pdctprice;
ImageView pfile;
Button pdctphoto, pdctupload, pdctsubmit;
String val1, val2, val3, val4, val5, val6, val7, val8, val9;
String Spinner_url1 = "category url";
String Spinner_url2 = “sub category url”
ClassJSONParser json = new ClassJSONParser();
private JSONArray data = null;
static final int REQUEST_TAKE_PHOTO = 1;
String mCurrentPhotoPath;
private String myJSON;
String monthname = "cat_name";
private ArrayList<String> arrayList;
static String strSDCardPathName = Environment.getExternalStorageDirectory() + "/DCIM" + "/";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.product_form);
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
spindisplaydata();
createFolder();
prospin = (Spinner) findViewById(R.id.spinner);
prospin1 = (Spinner) findViewById(R.id.spinner1);
prospin.setOnItemSelectedListener(this);
pdctname = (EditText) findViewById(R.id.pname);
pdctbrand = (EditText) findViewById(R.id.pbrand);
pdctmodel = (EditText) findViewById(R.id.pmodel);
pdctdiscount = (EditText) findViewById(R.id.pdiscount);
pdctdisvalidity = (EditText) findViewById(R.id.pdiscountvalidity);
pdctprice = (EditText) findViewById(R.id.proprice);
pfile = (ImageView) findViewById(R.id.pfilepath);
pdctphoto = (Button) findViewById(R.id.prophoto);
pdctphoto.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
File photoFile = null;
try {
photoFile = createImageFile();
} catch (IOException ex) {
ex.printStackTrace();
}
if (photoFile != null) {
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT,
Uri.fromFile(photoFile));
startActivityForResult(takePictureIntent, REQUEST_TAKE_PHOTO);
}
}
}
});
pdctupload = (Button) findViewById(R.id.proupload);
pdctsubmit = (Button) findViewById(R.id.prosubmit);
pdctsubmit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
val1 = pdctname.getText().toString();
val2 = pdctbrand.getText().toString();
val3 = pdctmodel.getText().toString();
val4 = pdctdiscount.getText().toString();
val5 = pdctdisvalidity.getText().toString();
val6 = pdctprice.getText().toString();
val7 = prospin.getSelectedItem().toString();
val8 = prospin1.getSelectedItem().toString();
val9 = pfile.getResources().toString();
if (val1.equals("") || val2.equals("") || val3.equals("") || val4.equals("") || val5.equals("") || val6.equals("")) {
}
}
});
}
private void spindisplaydata() {
class GetDataJSON extends AsyncTask<String, Void, String> {
private String line;
@Override
protected String doInBackground(String... params) {
InputStream is = null;
String result = null;
arrayList = new ArrayList<>();
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
String key12 = "3015";
nameValuePairs.add(new BasicNameValuePair("id", key12));
try {
HttpClient httpclient = new DefaultHttpClient();
String php_url = Spinner_url1;
HttpPost httppost = new HttpPost(php_url);
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
} catch (Exception e) {
Log.e("Fail 1", e.toString());
Toast.makeText(getApplicationContext(),
"Invalid IP Address", Toast.LENGTH_LONG).show();
}
try {
BufferedReader reader = new BufferedReader(
new InputStreamReader(is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
while ((line = reader.readLine()) != null) {
sb.append(line + "n");
}
is.close();
result = sb.toString();
Log.e("pass 2", "connection success ");
} catch (Exception e) {
Log.e("Fail 2", e.toString());
}
return result;
}
@Override
protected void onPostExecute(String result) {
myJSON = result;
showList1();
}
}
GetDataJSON g = new GetDataJSON();
g.execute();
}
private void showList1() {
final ArrayList<HashMap<String, Object>> lista = new ArrayList<HashMap<String, Object>>();
HashMap<String, Object> data;
try {
JSONObject json_data = new JSONObject(myJSON);
JSONArray jArray = json_data.getJSONArray("result");
for (int i = 0; i < jArray.length(); i++) {
json_data = jArray.getJSONObject(i);
data = new HashMap<String, Object>();
data.put("catname", json_data.getString(monthname));
lista.add(data);
arrayList.add(json_data.getString(monthname));
Log.e("Catnames", "" + monthname);
Log.e("Catnames", "" + arrayList);
}
SpinAdapter1 adapter = new SpinAdapter1(lista, ProductForm.this, arrayList);
prospin.setAdapter(adapter);
} catch (JSONException e) {
Log.e("log_tag2", "Error parsing data " + e.toString());
}
}
private File createImageFile() throws IOException {
// Create an image file name
@SuppressLint("SimpleDateFormat") String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String imageFileName = "JPEG_" + timeStamp + "_";
File storageDir = new File(strSDCardPathName);
File image = File.createTempFile(imageFileName, ".jpg", storageDir);
mCurrentPhotoPath = image.getAbsolutePath();
return image;
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == RESULT_OK) {
//*** Rename File
String strNewName = "MyPicture.jpg";
String NewPath = strSDCardPathName + strNewName;
Log.e("Pathname", "" + NewPath);
//*** Resize Images
try {
ResizeImages(mCurrentPhotoPath, NewPath);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Bitmap bitmap = BitmapFactory.decodeFile(NewPath);
pfile.setImageBitmap(bitmap);
GalleryAddPic();
}
}
private void GalleryAddPic() {
Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
File f = new File(mCurrentPhotoPath);
Uri contentUri = Uri.fromFile(f);
mediaScanIntent.setData(contentUri);
this.sendBroadcast(mediaScanIntent);
}
public static void ResizeImages(String sPath, String sTo) throws IOException {
Bitmap photo = BitmapFactory.decodeFile(sPath);
photo = Bitmap.createScaledBitmap(photo, 720, 600, false);
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
photo.compress(Bitmap.CompressFormat.JPEG, 100, bytes);
File f = new File(sTo);
f.createNewFile();
FileOutputStream fo = new FileOutputStream(f);
fo.write(bytes.toByteArray());
fo.close();
File file = new File(sPath);
file.delete();
}
public static void createFolder() {
File folder = new File(strSDCardPathName);
try {
// Create folder
if (!folder.exists()) {
folder.mkdir();
}
} catch (Exception ex) {
}
}
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
String selectedItemText = parent.getItemAtPosition(position).toString();
Toast.makeText(ProductForm.this, selectedItemText, Toast.LENGTH_SHORT).show();
try {
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("cat_name_sub", prospin.getSelectedItem().toString()));
JSONObject obj1 = json.membuatHttpRequest(Spinner_url2, "GET", params);
data = obj1.getJSONArray(TAG_SEMUA_KOMENTAR);
final ArrayList<HashMap<String, String>> MyArrList = new ArrayList<HashMap<String, String>>();
HashMap<String, String> map;
}
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
}
使用此库：可搜索微调器
这是一个非常简单的微调器库，您只需要在适配器中设置字符串列表并将适配器设置为微调器，然后打开Item选择微调器，您可以获得第一个微调器选定项目 ID，并在此基础上获取第二个微调器的数据！