上传相机图像到Firebase

Question

我需要存储从照相机到gallery再到firebase的图像。在我的项目上传从画廊工作，但当我试图从相机上传什么都没有发生。当您在“多媒体资料”或“照相机”之间选择“单击”按钮时。当从“多媒体资料”中拍照或选择“图像”时，在“图像视图”中我可以获得图像。然后我点击save，若图片来自gallery，则保存到存储器，并在数据库中创建子对象，但若图片来自camera，则无法工作。这个问题有解决办法吗？

美娜ctivity.java

public class MainActivity extends AppCompatActivity {
    private Uri mImageUri = null;
    private Button btn,mSubmitBtn;
    private ImageView imageview;
    private int GALLERY = 1, CAMERA = 2;

    private StorageReference mStorage;
    private DatabaseReference mDatabase;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        btn = (Button) findViewById(R.id.btn);
        mSubmitBtn = (Button)findViewById(R.id.submit);
        imageview = (ImageView) findViewById(R.id.iv);

        mStorage = FirebaseStorage.getInstance().getReference();
        mDatabase = FirebaseDatabase.getInstance().getReference().child("Upload");
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                showPictureDialog();
            }
        });

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

    }

    private void showPictureDialog(){
        AlertDialog.Builder pictureDialog = new AlertDialog.Builder(this);
        pictureDialog.setTitle("Select Action");
        String[] pictureDialogItems = {
                "Select photo from gallery",
                "Capture photo from camera" };
        pictureDialog.setItems(pictureDialogItems,
                new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        switch (which) {
                            case 0:
                                choosePhotoFromGallary();
                                break;
                            case 1:
                                takePhotoFromCamera();
                                break;
                        }
                    }
                });
        pictureDialog.show();
    }

    public void choosePhotoFromGallary() {
        Intent galleryIntent = new Intent(Intent.ACTION_PICK,
                android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);

        startActivityForResult(galleryIntent, GALLERY);
    }

    private void takePhotoFromCamera() {
        Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
        startActivityForResult(intent, CAMERA);
    }

    ////////////////////////////
    private void startPosting(){

        if (mImageUri !=null){

            StorageReference filepath = mStorage.child("Images").child(mImageUri.getLastPathSegment());


            filepath.putFile(mImageUri).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
                @Override
                public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {

                    Uri downloadUrl = taskSnapshot.getDownloadUrl();

                    DatabaseReference newPost = mDatabase.push();//push kreira uniq random id


                    newPost.child("image").setValue(downloadUrl.toString());

                }
            });
        }
    }

    ////////////////////////
    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {

        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode == this.RESULT_CANCELED) {
            return;
        }
        if (requestCode == GALLERY) {
            if (data != null) {
                mImageUri = data.getData();
                imageview.setImageURI(mImageUri);
            }

        } else if (requestCode == CAMERA) {
            Bitmap thumbnail = (Bitmap) data.getExtras().get("data");
            imageview.setImageBitmap(thumbnail);
            imageview.setImageURI(mImageUri);

        }
    }


}

Answer 1

我也面临同样的问题，这主要发生在Kitkat和更低版本上。单击图像时，请尝试以下方法直接获取位图文件：，

Bitmap thumbnail = (Bitmap) data.getExtras().get("data");
        ByteArrayOutputStream bytes = new ByteArrayOutputStream();
        thumbnail.compress(Bitmap.CompressFormat.JPEG, 90, bytes);
        File destination = new File(Environment.getExternalStorageDirectory(),
                System.currentTimeMillis() + ".jpg");
        FileOutputStream fo;
        try {
            destination.createNewFile();
            fo = new FileOutputStream(destination);
            fo.write(bytes.toByteArray());
            fo.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
         imageview.setImageBitmap(thumbnail);

此外，在清单文件中，请确保您已经声明了以下权限以及外部读取权限

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

出现此问题的原因是Android 4.4（KitKat）改变了SD卡上权限的处理方式。因此，最好在SD卡上创建自己的目录，以处理应用程序需要写入的所有文件。这也适用于所有更高版本。

希望这能有所帮助。