android - 如何在带有 php mysql 的 android 中的一个 Activity 中使用两个微调器

Question

我正在为电子商务开发 android 应用程序。我在一个 Activity 中使用了两个微调器，第一个微调器获取类别到 json。它选择基于国家/地区的获取子类别到 php json 但我不知道这个概念如何实现这个概念请帮忙

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) {

    }


}

Answer 1

使用这个库:Searchable Spinner

这是非常简单的 Spinner 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，然后在 Spinner 的 onItemSelect 之后您可以获得第一个微调器的选定项目 ID，并基于此可以获取第二个微调器的数据!