Question

我正在执行以下操作以从相机捕获图像并将其通过改造多部分图像上载上传到Web服务，但是我在将位图转换为图像文件以能够填充改造Web的图像文件多部分参数时遇到问题服务电话。我已经使用URI将位图从相机转换为文件，并且在该函数中出现了空指针异常。

Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(cameraIntent, CAMERA_REQUEST);

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == CAMERA_REQUEST && resultCode == Activity.RESULT_OK)
    {
        final Bitmap photo = (Bitmap) data.getExtras().get("data");

        // CALL THIS METHOD TO GET THE URI FROM THE BITMAP
        Uri tempUri = getImageUri(getActivity(), photo);

        // CALL THIS METHOD TO GET THE ACTUAL PATH
        File file = new File(getRealPathFromURI(tempUri));

        MyWebService webService =
                MyWebService.retrofit.create(MyWebService.class);

        MultipartBody.Part filePart = MultipartBody.Part.createFormData("file", file.getName(), RequestBody.create(MediaType.parse("image/*"), file));

        Call<com.syamantak.footsteps.models.response.Response> call = webService.set_profile_photo(filePart, "Bearer " + MainActivity.api_token);
        MainActivity.setProgressBarVisible();
        call.enqueue(new Callback<com.syamantak.footsteps.models.response.Response>() {
            @Override
            public void onResponse(Call<com.syamantak.footsteps.models.response.Response> call, Response<com.syamantak.footsteps.models.response.Response> response) {
                MainActivity.setProgressBarInVisible();
                com.syamantak.footsteps.models.response.Response jsonResponse = response.body();
                selfieImage.setImageBitmap(photo);
                Toast.makeText(getActivity(), jsonResponse.getMessage(), Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onFailure(Call<com.syamantak.footsteps.models.response.Response> call, Throwable t) {
                t.getLocalizedMessage();
            }
        });
    }
}


public Uri getImageUri(Context inContext, Bitmap inImage) {
    ByteArrayOutputStream bytes = new ByteArrayOutputStream();
    inImage.compress(Bitmap.CompressFormat.JPEG, 100, bytes);
    String path = MediaStore.Images.Media.insertImage(inContext.getContentResolver(), inImage, "Title", null);
    return Uri.parse(path);
}

public String getRealPathFromURI(Uri uri) {
    String path = "";
    if (getActivity().getContentResolver() != null) {
        Cursor cursor = getActivity().getContentResolver().query(uri, null, null, null, null);
        if (cursor != null) {
            cursor.moveToFirst();
            int idx = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);
            path = cursor.getString(idx);
            cursor.close();
        }
    }
    return path;
}

以下是我的清单文件

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.syamantak.footsteps">

<uses-feature android:name="android.hardware.sensor.accelerometer" android:required="true" />
<uses-feature android:name="android.hardware.camera"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.INTERNET"/>

我遇到以下错误

E/MediaStore: Failed to insert image
java.lang.SecurityException: Permission Denial: writing com.android.providers.media.MediaProvider uri content://media/external/images/media from pid=28108, uid=10237 requires android.permission.WRITE_EXTERNAL_STORAGE, or grantUriPermission()

和

java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=67424, result=-1, data=Intent { act=inline-data (has extras) }} to activity {com.syamantak.footsteps/com.syamantak.footsteps.activities.MainActivity}: java.lang.NullPointerException: uriString

我在做什么错了？

Answer 1

我到达了以下解决方案

        final Bitmap photo = (Bitmap) data.getExtras().get("data");
        File file = savebitmap(photo);

        MyWebService webService =
                MyWebService.retrofit.create(MyWebService.class);

        MultipartBody.Part filePart = MultipartBody.Part.createFormData("photo", file.getName(), RequestBody.create(MediaType.parse("image/*"), file));

        Call<com.syamantak.footsteps.models.response.Response> call = webService.set_profile_photo(filePart, "Bearer " + MainActivity.api_token);
        MainActivity.setProgressBarVisible();
        call.enqueue(new Callback<com.syamantak.footsteps.models.response.Response>() {
            @Override
            public void onResponse(Call<com.syamantak.footsteps.models.response.Response> call, Response<com.syamantak.footsteps.models.response.Response> response) {
                MainActivity.setProgressBarInVisible();
                com.syamantak.footsteps.models.response.Response jsonResponse = response.body();
                selfieImage.setImageBitmap(photo);
                Toast.makeText(getActivity(), jsonResponse.getMessage(), Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onFailure(Call<com.syamantak.footsteps.models.response.Response> call, Throwable t) {
                t.getLocalizedMessage();
            }
        });

和以下将位图转换为文件的功能

private File savebitmap(Bitmap bmp) {
    String extStorageDirectory = Environment.getExternalStorageDirectory().toString();
    OutputStream outStream = null;
    // String temp = null;
    File file = new File(extStorageDirectory, "temp.png");
    if (file.exists()) {
        file.delete();
        file = new File(extStorageDirectory, "temp.png");

    }

    try {
        outStream = new FileOutputStream(file);
        bmp.compress(Bitmap.CompressFormat.PNG, 100, outStream);
        outStream.flush();
        outStream.close();

    } catch (Exception e) {
        e.printStackTrace();
        return null;
    }
    return file;
}

运行良好。

如何从相机捕获图像并将其上传到多部分改造？

1 个答案: