Camera Intent在onActivityResult上返回null

Question

我正在尝试拍照并将其保存到自定义位置 -

public void SavePhoto(View view){

    Intent imageIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());

    File imagesFolder = new File(Environment.getExternalStorageDirectory(), "WorkingWithPhotosApp");
    imagesFolder.mkdirs();

    File image = new File(imagesFolder, "QR_" + timeStamp + ".png");
    Uri uriSavedImage = Uri.fromFile(image);

    imageIntent.putExtra(MediaStore.EXTRA_OUTPUT, uriSavedImage);
    startActivityForResult(imageIntent, REQUEST_IMAGE_CAPTURE);
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if(data==null){
        Toast.makeText(MainActivity.this, "Data is null", Toast.LENGTH_SHORT).show();
    }
    else{
        if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
            Bundle extras = data.getExtras();
            Bitmap imageBitmap = (Bitmap) extras.get("data");
            ImageView mImageView=(ImageView)findViewById(R.id.imageView);
            mImageView.setImageBitmap(imageBitmap);
        }
    }
}

onActivityResult（）中的数据为空。我错过了什么？

Answer 1

你在这里预先插入一个uri：

 imageIntent.putExtra(MediaStore.EXTRA_OUTPUT, uriSavedImage);

因此，当你得到一个Activity.RESULT_OK时，只需通过其已知网址加载拍摄的照片。然后你可以设置路径onActivityResult如下，但你需要转换为位图。

if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
           // Convert here your uri to bitmap then set it.//
            mImageView.setImageBitmap(YOUR_BITMAP);
 }

Answer 2

文件imagesFolder = new File（Environment.getExternalStorageDirectory（），“WorkingWithPhotosApp”）;

我想你需要先检查你的目录是否存在。这就是我执行此任务的方式。在我的情况下，我在默认的DCIM目录中创建一个文件夹。

private void dispatchTakePictureIntent(int actionCode) {
        Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
            File f = null;
            try {
                f = setUpPhotoFile();
                takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(f));
            } catch (IOException e) {
                e.printStackTrace();
                f = null;
            }
    startActivityForResult(takePictureIntent, actionCode);
    }

private File setUpPhotoFile() throws IOException {
        File f = createImageFile();
        return f;
    }

private File createImageFile() throws IOException {
        // Create an image file name
        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
        String imageFileName = "IMG_" + timeStamp + "_";
        File albumF = getAlbumDir();
        File imageF = File.createTempFile(imageFileName, ".jpg", albumF);
        return imageF;
    }

private File getAlbumDir() {
        File storageDir = null;
        if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())) {
            storageDir = getAlbumStorageDir(PHOTO_ALBUM_NAME);
            if (storageDir != null) {
                if (! storageDir.mkdirs()) {
                    if (! storageDir.exists()){
                        Log.d("Camera", "failed to create directory");
                        return null;
                    }
                }
            }
        } else {
            Log.v(getString(R.string.app_name), "External storage is not mounted READ/WRITE.");
        }
        return storageDir;
    }

public File getAlbumStorageDir(String albumName) {
        return new File (
                Environment.getExternalStorageDirectory()
                        + "/dcim/"
                        + albumName);
    }

希望这可以帮助！

Answer 3

试试这样：

if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
       Strng imagePath = uriSavedImage.getPath(); // uriSavedImage - make it global
}

Answer 4

我和你一样有同样的问题，所以我决定实施here给出的解决方案

然后，在我自己的项目中，我做到了

第一：在清单中创建提供程序，与指南所说的相同。 第二：创建一个类名LegacyCompatCursorWrapper（ps。参见指南或与我联系，我可以发送代码），你需要这个类，在下面的步骤中。 第三：创建这个类LegacyCompatFileProvider 第四：在此之前

startActivityForResult(takePictureIntent, actionCode);

实现这一点

 Intent i=new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    Uri outputUri=FileProvider.getUriForFile(this, AUTHORITY, output);

    i.putExtra(MediaStore.EXTRA_OUTPUT, outputUri);

    if (Build.VERSION.SDK_INT>=Build.VERSION_CODES.LOLLIPOP) {
        i.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
    }
    else if (Build.VERSION.SDK_INT>=Build.VERSION_CODES.JELLY_BEAN) {
        ClipData clip=
                ClipData.newUri(getContentResolver(), "A photo", outputUri);

        i.setClipData(clip);
        i.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
    }
    else {
        List<ResolveInfo> resInfoList=
                getPackageManager()
                        .queryIntentActivities(i, PackageManager.MATCH_DEFAULT_ONLY);

        for (ResolveInfo resolveInfo : resInfoList) {
            String packageName = resolveInfo.activityInfo.packageName;
            grantUriPermission(packageName, outputUri,
                    Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
        }
    }

    try {
        startActivityForResult(i, CONTENT_REQUEST);
    }
    catch (ActivityNotFoundException e) {
        Toast.makeText(this, R.string.msg_no_camera, Toast.LENGTH_LONG).show();
        finish();
    }

所以在onActivityResult（）中

  if (requestCode == CONTENT_REQUEST) {
          //  if (resultCode == RESULT_OK) {
                Intent i=new Intent(Intent.ACTION_VIEW);
                Uri outputUri=FileProvider.getUriForFile(this, AUTHORITY, output);

                i.setDataAndType(outputUri, "image/jpeg");
                i.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
                Bitmap thumbnail = null;
                Bundle extras = i.getExtras();
            try {
                thumbnail = MediaStore.Images.Media.getBitmap(this.getContentResolver(),outputUri );
            } catch (IOException e) {
                e.printStackTrace();
            }
            mImageProfile.setImageBitmap(thumbnail);
            saveImage(thumbnail);
 }

其中mImageProfile - >是View上的ImageView。请记住，这是根据指南。