how to send file to server with retrofit2 and alertDialog

Question

hi i want send file to server with retrofit2 and alertDialog but i have somthing error .

my Request by retrofit2

@Multipart
    @POST("ads")
    Call<ResponseBody> getUpload(@Header("Authorization") String token
            , @Part("title") RequestBody title
            , @Part("description") RequestBody description
            , @Part("price") RequestBody price
            , @Part("tell") RequestBody tell
            , @Part("address") RequestBody address
            , @Part("category") RequestBody category
            , @Part MultipartBody.Part image);

i create one floatingAction Button for add item

FloatingActionButton floatingActionButton = findViewById(R.id.fab);
        floatingActionButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                showList();
            }
        });

i create onActivityResult For me when I choose to notify me by changing the name of the Button

 @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == PICK_IMAGE_FROM_GALLERY_REQUEST && resultCode == RESULT_OK
                && data != null && data.getData() != null) {
            saveUri = data.getData();
            btn_select.setText("Image Selected !");
        }
    }

i create showlist for show me layout add new post and me fill information with alertDialog

 private void showList() {
        Log.d(TAG, "showList: started");
        AlertDialog.Builder alertDialog = new AlertDialog.Builder(Home.this);
        alertDialog.setTitle("Add new post");
        alertDialog.setMessage("please fill all information");

        LayoutInflater layoutInflater = this.getLayoutInflater();
        View view = layoutInflater.inflate(R.layout.add_new_post, null);

        tv_title = view.findViewById(R.id.tv_title);
        tv_category = view.findViewById(R.id.tv_category);
        tv_tell = view.findViewById(R.id.tv_tell);
        tv_price = view.findViewById(R.id.tv_price);
        tv_description = view.findViewById(R.id.tv_description);
        tv_address = view.findViewById(R.id.tv_address);

        btn_select = view.findViewById(R.id.btn_select);
        btn_upload = view.findViewById(R.id.btn_upload);

        btn_select.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                chooseImage();
            }
        });

        btn_upload.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                uploadImage(saveUri);
            }
        });


        alertDialog.setView(view);

        alertDialog.setPositiveButton("YES", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.dismiss();
            }
        });

        alertDialog.setNegativeButton("NO", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.dismiss();
            }
        });

        alertDialog.show();

    }

i create chooseImage for select image for read image in my gallery.

private void chooseImage() {
        Intent intent = new Intent();
        intent.setType("image/*");
        intent.setAction(Intent.ACTION_GET_CONTENT);
        startActivityForResult(Intent.createChooser(intent, "Select Picture"), PICK_IMAGE_FROM_GALLERY_REQUEST);
    }

In the end i create uploadImage for send file to server

private void uploadImage(Uri uri) {
        Log.d(TAG, "uploadImage: started");

        tv_title = findViewById(R.id.tv_title);
        tv_address = findViewById(R.id.tv_address);
        tv_description = findViewById(R.id.tv_description);
        tv_price = findViewById(R.id.tv_price);
        tv_tell = findViewById(R.id.tv_tell);
        tv_category = findViewById(R.id.tv_category);

        File originalFile = new File(uri.toString());

        RequestBody titlePart = RequestBody.create(MultipartBody.FORM, tv_title.getText().toString());
        RequestBody addressPart = RequestBody.create(MultipartBody.FORM, tv_address.getText().toString());
        RequestBody descriptionPart = RequestBody.create(MultipartBody.FORM, tv_description.getText().toString());
        RequestBody pricePart = RequestBody.create(MultipartBody.FORM, tv_price.getText().toString());
        RequestBody tellPart = RequestBody.create(MultipartBody.FORM, tv_tell.getText().toString());
        RequestBody categoryPart = RequestBody.create(MultipartBody.FORM, tv_category.getText().toString());

        RequestBody imagePart  = RequestBody.create(MediaType.parse(getContentResolver().getType(uri)),
                FileUtils.getFile(originalFile));

        MultipartBody.Part file = MultipartBody.Part.createFormData("image", originalFile.getName(), imagePart);

        SharedPreferences preferences = getSharedPreferences("Get_Token", MODE_PRIVATE);
        final String token = preferences.getString("Token", null);

        Call<ResponseBody> call = RetrofitClient.getmInstance().getApi().getUpload(token, titlePart, descriptionPart, pricePart, tellPart, addressPart, categoryPart, file);
        call.enqueue(new Callback<ResponseBody>() {
            @Override
            public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {

            }

            @Override
            public void onFailure(Call<ResponseBody> call, Throwable t) {

            }
        });
    }

and show me this error

2019-05-29 12:12:46.647 19215-19215/com.example.book E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.book, PID: 19215
    java.lang.NullPointerException: Attempt to invoke virtual method 'android.text.Editable android.widget.EditText.getText()' on a null object reference
        at com.example.book.Activities.Home.uploadImage(Home.java:160)
        at com.example.book.Activities.Home.access$200(Home.java:53)
        at com.example.book.Activities.Home$3.onClick(Home.java:123)
        at android.view.View.performClick(View.java:6261)
        at android.widget.TextView.performClick(TextView.java:11163)
        at android.view.View$PerformClick.run(View.java:23748)
        at android.os.Handler.handleCallback(Handler.java:751)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at android.os.Looper.loop(Looper.java:154)
        at android.app.ActivityThread.main(ActivityThread.java:6776)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1496)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1386)

Now tell me where I got it wrong . thanks

@Zoe Hi, I've fixed the problem and the program will not get any errors, but the file will not be sent to the server — Saeed, May 29 '19 at 08:37

sushildlh · Answer 1 · 2019-05-29T07:52:37.257

Thrown to indicate that the code has attempted to cast an object to a subclass of which it is not an instance. For example, the following code generates a ClassCastException:

Error:-

java.lang.ClassCastException: android.support.v7.widget.AppCompatTextView cannot be cast to android.widget.EditText

This error telling you that you are trying to typecast AppCompatTextView into EditText.

Go through your XML and check which one you are trying to cast forcefully.

Solution:- Change in your XML (TextView into EditaText) or in your activity (EditText into TextView).

Error:-

java.lang.NullPointerException: Attempt to invoke virtual method 'android.text.Editable android.widget.EditText.getText()' on a null object reference

NullPointerException telling you that the EditText object are you accessing is null. Because you didn't provide EditText object any memory. Means you are accessing it without binding.

Solution:- Bind your EditText object using findViewById to the id you have mentioned in XML.

Check answer and understand every Exception error. It will help you for long run. — sushildlh, May 29 '19 at 07:53

how to send file to server with retrofit2 and alertDialog

1 Answers1