我有一个片段，用户用相机拍照，然后上传到Firebase。我将图像编码为一个没有问题的字符串。我在Firebase控制台中看到转换后的图像字符串。我遇到的问题是从Firebase解码图像字符串以显示为Recyclerview中的图像时没有显示任何内容。
如果您可以帮助我了解我的问题以及如何纠正它，我会非常感激。我一直试图通过阅读其他Stackexchange帖子来解决这个问题3天，但我无法弄清楚我的问题在哪里。
感谢。
我的片段：
public class AddImageFragment extends Fragment {
public static final int REQUEST_IMAGE_CAPTURE = 111;
private EditText progressDetail;
private Button cameraButton;
private Button saveButton;
private Button cancelButton;
private ImageView capturedImage;
private DatabaseReference mDatabaseReference;
public ImageProgress mImageProgress;
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.add_image_fragment, container, false);
progressDetail = (TextInputEditText) v.findViewById(R.id.progressStatusEditText);
capturedImage = (ImageView) v.findViewById(R.id.capturedImageView);
cameraButton = (Button) v.findViewById(R.id.takePictureButton);
saveButton = (Button) v.findViewById(R.id.saveButton);
cameraButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
openCamera();
}
});
//initialize firebase database
mDatabaseReference = FirebaseDatabase.getInstance().getReference();
saveButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//get current user
FirebaseUser user =FirebaseAuth.getInstance().getCurrentUser();
String uid = user.getUid();
try {
Bitmap image = decodeFromFirebaseBase64(mImageProgress.getImageUrl());
capturedImage.setImageBitmap(image);
}catch (IOException e){
e.printStackTrace();
}
myNewImage(uid, progressDetail.getText().toString(),capturedImage.toString());
getActivity().onBackPressed();
}
});
return v;
}
private void myNewImage(String uid, String progressDetails, String imageUrl) {
ImageProgress imageProgress = new ImageProgress(progressDetails, imageUrl);
mDatabaseReference.child("Progress").child(uid).child("Images").push().setValue(imageProgress);
}
private void openCamera() {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (intent.resolveActivity(getActivity().getPackageManager()) != null) {
startActivityForResult(intent, REQUEST_IMAGE_CAPTURE);
}
startActivityForResult(intent, REQUEST_IMAGE_CAPTURE);
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == getActivity().RESULT_OK) {
Bundle extras = data.getExtras();
Bitmap imageBitmap = (Bitmap) extras.get("data");
capturedImage.setImageBitmap(imageBitmap);
encodeBitmapAndSaveToFirebase(imageBitmap);
}
}
public void encodeBitmapAndSaveToFirebase(Bitmap bitmap) {
//current user
FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
String uid = user.getUid();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 100, baos);
String imageEncoded = Base64.encodeToString(baos.toByteArray(), Base64.DEFAULT);
DatabaseReference reference = FirebaseDatabase.getInstance().getReference();
reference.child("Progress").child(uid).child("imageUrl").push().setValue(imageEncoded);
}
public static Bitmap decodeFromFirebaseBase64(String image) throws IOException {
byte[] decodeByteArray = android.util.Base64.decode(image, Base64.DEFAULT);
return BitmapFactory.decodeByteArray(decodeByteArray, 0, decodeByteArray.length);
}
}
活动
public class WeightProgressActivity extends BaseActivity {
public ImageProgress mImageProgress;
private FloatingActionButton fab;
ScaleAnimation shrinkAnim;
private RecyclerView mRecyclerView;
private LinearLayoutManager mLayoutManager;
public ImageView capturedImage;
//firebase database reference
FirebaseDatabase database = FirebaseDatabase.getInstance();
DatabaseReference mDatabaseReference = database.getReference();
//get current user
FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
String uid = user.getUid();
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.weight_progress);
setNavDrawer(new MainNavDrawer(this));
//initialize recyclerview
mRecyclerView = (RecyclerView)findViewById(R.id.recyclerView);
shrinkAnim = new ScaleAnimation(1.15f, 0f, 1.15f, 0f, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
if(mRecyclerView != null){
mRecyclerView.setHasFixedSize(true);
}
//using linearlayout manager in recyclerview
mLayoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(mLayoutManager);
//firebaserecycleradapter (firebase ui)
FirebaseRecyclerAdapter<ImageProgress, ImageViewHolder> adapter = new FirebaseRecyclerAdapter<ImageProgress, ImageViewHolder>(
ImageProgress.class, R.layout.weight_progress_list, ImageViewHolder.class, mDatabaseReference.child("images").child(uid).
child("Progress Images").getRef()
) {
@Override
protected void populateViewHolder(ImageViewHolder viewHolder, ImageProgress model, int position) {
viewHolder.progressDetail.setText(model.getProgressDetail());
try {
Bitmap image = decodeFromFirebaseBase64(mImageProgress.getImageUrl());
viewHolder.capturedImage.setImageBitmap(image);
}catch (IOException e){
e.printStackTrace();
}
}
};
mRecyclerView.setAdapter(adapter);
fab = (FloatingActionButton)findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
getSupportFragmentManager().beginTransaction().replace(R.id.frame_container,
new AddImageFragment()).addToBackStack(null).commit();
//animation to make actionbar disappear
shrinkAnim.setDuration(400);
fab.setAnimation(shrinkAnim);
shrinkAnim.start();
shrinkAnim.setAnimationListener(new Animation.AnimationListener() {
@Override
public void onAnimationStart(Animation animation) {
}
@Override
public void onAnimationEnd(Animation animation) {
//changing floating actionbar visibility to gone on animation end
fab.setVisibility(View.GONE);
}
@Override
public void onAnimationRepeat(Animation animation) {
}
});
}
});
}
//on back press code
@Override
public void onBackPressed() {
super.onBackPressed();
if (fab.getVisibility() == View.GONE)
fab.setVisibility(View.VISIBLE);
}
//weightViewHolder method
public static class ImageViewHolder extends RecyclerView.ViewHolder{
EditText progressDetail;
ImageView capturedImage;
public ImageViewHolder(View v){
super(v);
progressDetail = (EditText) v.findViewById(R.id.progressStatusEditText);
capturedImage = (ImageView) v.findViewById(R.id.capturedImageView);
}
}
public static Bitmap decodeFromFirebaseBase64(String image) throws IOException {
byte[] decodeByteArray = android.util.Base64.decode(image, Base64.DEFAULT);
return BitmapFactory.decodeByteArray(decodeByteArray, 0, decodeByteArray.length);
}
}