我正在设置我的recyclerview以从Firebase存储和Firebase数据库检索数据。但是存储中的图像没有出现。
我的适配器无法更新的另一个问题
我已经尝试过firebaseui recyler以及其他实现recyclerview来检索图像的方法。
我有以下链接示例： https://github.com/mitchtabian/Recyclerview https://github.com/jdulal/AndroidUploadRetrieveimagesusingFirebaseStorage/tree/83d96192f92c2b96288c30234f3a3eb09e928228
这是我的模型类Sample.java
public class Sample {
private String SampleID;
private String SampleDate;
private String SampleTime;
private String SampleLocation;
private String SampleImageUrl;
public Sample() {}
public Sample(String sampleID, String sampleDate, String sampleTime, String sampleLocation, String sampleImageUrl) {
SampleID = sampleID;
SampleDate = sampleDate;
SampleTime = sampleTime;
SampleLocation = sampleLocation;
SampleImageUrl = sampleImageUrl;
}
public String getSampleID() {
return SampleID;
}
public String getSampleImageUrl() {
return SampleImageUrl;
}
public String getSampleDate() {
return SampleDate;
}
public String getSampleTime() {
return SampleTime;
}
public String getSampleLocation() {
return SampleLocation;
}
public void setSampleID(String sampleID) {
SampleID = sampleID;
}
public void setSampleDate(String sampleDate) {
SampleDate = sampleDate;
}
public void setSampleTime(String sampleTime) {
SampleTime = sampleTime;
}
public void setSampleLocation(String sampleLocation) {
SampleLocation = sampleLocation;
}
public void setSampleImageUrl(String sampleImageUrl) {
SampleImageUrl = sampleImageUrl;
}
}
适配器类SampleListAdater.java
public class SampleListAdapter extends RecyclerView.Adapter < SampleListAdapter.ImageViewHolder > {
private Context mContext;
private List < Sample > mSample;
public SampleListAdapter(Context context, List < Sample > samples) {
mContext = context;
mSample = samples;
}
@NonNull
@Override
public ImageViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int viewType) {
View v = LayoutInflater.from(mContext).inflate(R.layout.activity_sample_list_item, viewGroup, false);
return new ImageViewHolder(v);
}
@Override
public void onBindViewHolder(@NonNull ImageViewHolder imageViewHolder, int position) {
Sample sample = mSample.get(position);
imageViewHolder.textViewID.setText(sample.getSampleID());
Picasso.get()
.load(sample.getSampleImageUrl())
.placeholder(R.drawable.photo)
.fit()
.centerCrop()
.into(imageViewHolder.imageView);
}
@Override
public int getItemCount() {
return mSample.size();
}
class ImageViewHolder extends RecyclerView.ViewHolder {
TextView textViewID;
ImageView imageView;
public ImageViewHolder(View itemView) {
super(itemView);
textViewID = itemView.findViewById(R.id.text_view_id);
imageView = itemView.findViewById(R.id.image_view_upload);
}
}
}
这是我的活动代码SampleList.java
public class SampleList extends AppCompatActivity
{
DatabaseReference mRef;
StorageReference storageRef;
RecyclerView recyclerView;
ArrayList<Sample> list;
SampleListAdapter sampleListAdapter;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sample_list);
recyclerView = findViewById(R.id.ImgViewer);
recyclerView.setHasFixedSize(true);
LinearLayoutManager manager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(manager);
recyclerView.setHasFixedSize(true);
storageRef = FirebaseStorage.getInstance().getReference().child("Sample Images/");
mRef = FirebaseDatabase.getInstance().getReference().child("Samples");
mRef.addValueEventListener(new ValueEventListener()
{
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot)
{
list = new ArrayList<Sample>();
for(DataSnapshot dataSnapshot1: dataSnapshot.getChildren())
{
Sample s= dataSnapshot1.getValue(Sample.class);
list.add(s);
}
sampleListAdapter = new SampleListAdapter(SampleList.this,list);
recyclerView.setAdapter(sampleListAdapter);
sampleListAdapter.notifyDataSetChanged();
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError)
{
Toast.makeText(SampleList.this, "Opsss.... Something is wrong", Toast.LENGTH_SHORT).show();
}
});
}
}
这是将数据添加到Firebase数据库的活动
public class RegisterSample extends AppCompatActivity implements DatePickerDialog.OnDateSetListener, TimePickerDialog.OnTimeSetListener
{
public Button btn_datePicker;
public Button btn_timePicker;
public Button btn_Camera;
public Button btn_AddSam;
private EditText SamID, DateText, TimeText, LocText;
private ImageView SamImage;
private int REQUEST_CAMERA = 0, SELECT_FILE =1;
private String userChooseTask;
Uri FilePathUri;
DatabaseReference databaseReference;
StorageReference storageReference;
String Storage_Path = "Sample Images/";
String Database_Path = "Samples";
ProgressDialog progressDialog ;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_register_sample);
if(getSupportActionBar() != null){
getSupportActionBar().setTitle("Sample Registration");
}
SamID = findViewById(R.id.SamID);
DateText = findViewById(R.id.DateText);
TimeText = findViewById(R.id.TimeText);
LocText = findViewById(R.id.LocText);
databaseReference = FirebaseDatabase.getInstance().getReference(Database_Path);
storageReference = FirebaseStorage.getInstance().getReference();
progressDialog = new ProgressDialog(RegisterSample.this);
btn_AddSam = findViewById(R.id.btn_AddSam);
btn_AddSam.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v)
{
addSample();
}
});
btn_datePicker = findViewById(R.id.btn_datepicker);
btn_datePicker.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
DialogFragment datePicker = new DatePickerFragment();
datePicker.show(getSupportFragmentManager(), "date picker");
}
});
btn_timePicker = findViewById(R.id.btn_timepicker);
btn_timePicker.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
DialogFragment timePicker = new TimePickerFragment();
timePicker.show(getSupportFragmentManager(), "time picker");
}
});
btn_Camera = findViewById(R.id.btn_Camera);
btn_Camera.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v)
{
selectImage();
}
});
SamImage = findViewById(R.id.SamImage);
}
@Override
public void onDateSet(DatePicker view, int year, int month, int dayOfMonth) {
Calendar c = Calendar.getInstance();
c.set(Calendar.YEAR, year);
c.set(Calendar.MONTH, month);
c.set(Calendar.DAY_OF_MONTH, dayOfMonth);
String currentDateString = DateFormat.getDateInstance().format(c.getTime());
TextView DateText = findViewById(R.id.DateText);
DateText.setText(currentDateString);
}
@Override
public void onTimeSet(TimePicker view, int hourOfDay, int minute ) {
TextView TimeText = findViewById(R.id.TimeText);
TimeText.setText(String.format("%02d:%02d", hourOfDay, minute));
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
switch (requestCode) {
case Utility.MY_PERMISSIONS_REQUEST_READ_EXTERNAL_STORAGE:
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
if (userChooseTask.equals("Take Photo"))
cameraIntent();
else if (userChooseTask.equals("Choose from Gallery"))
galleryIntent();
} else {
Toast.makeText(RegisterSample.this, "Access Denied",Toast.LENGTH_LONG).show();
}
break;
}
}
private void selectImage() {
final CharSequence[] items = {"Take Photo", "Choose from Gallery",
"Cancel"};
AlertDialog.Builder builder = new AlertDialog.Builder(RegisterSample.this);
builder.setTitle("Add Photo");
builder.setItems(items, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int item) {
boolean result = Utility.checkPermission(RegisterSample.this);
if (items[item].equals("Take Photo")) {
userChooseTask = "Take Photo";
if (result)
cameraIntent();
} else if (items[item].equals("Choose from Gallery")) {
userChooseTask = "Choose from Gallery";
if (result)
galleryIntent();
} else if (items[item].equals("Cancel")) {
dialog.dismiss();
}
}
});
builder.show();
}
private void galleryIntent() {
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);//
startActivityForResult(Intent.createChooser(intent, "Select File"), SELECT_FILE );
}
private void cameraIntent() {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(intent, REQUEST_CAMERA);
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == Activity.RESULT_OK) {
if (requestCode == SELECT_FILE)
onSelectFromGalleryResult(requestCode, resultCode, data);
else if (requestCode == REQUEST_CAMERA)
onCaptureImageResult(requestCode, resultCode, data);
}
}
private void onCaptureImageResult(int requestCode, int resultCode, Intent data)
{
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == REQUEST_CAMERA && resultCode == RESULT_OK && data != null && data.getData() != null)
{
FilePathUri = data.getData();
try
{
Bitmap bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), FilePathUri);
SamImage.setImageBitmap(bitmap);
}
catch (FileNotFoundException e)
{
e.printStackTrace();
}
catch (IOException e)
{
e.printStackTrace();
}
}
}
@SuppressWarnings("deprecation")
protected void onSelectFromGalleryResult(int requestCode, int resultCode, Intent data)
{
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == SELECT_FILE && resultCode == RESULT_OK && data != null && data.getData() != null)
{
FilePathUri = data.getData();
try
{
Bitmap bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), FilePathUri);
SamImage.setImageBitmap(bitmap);
}
catch (IOException e)
{
e.printStackTrace();
}
}
}
public String GetFileExtension(Uri uri)
{
ContentResolver contentResolver = getContentResolver();
MimeTypeMap mimeTypeMap = MimeTypeMap.getSingleton();
return mimeTypeMap.getExtensionFromMimeType(contentResolver.getType(uri)) ;
}
public void addSample()
{
if (FilePathUri != null)
{
progressDialog.setTitle("Image is Uploading...");
progressDialog.show();
StorageReference storageReference2nd = storageReference.child(Storage_Path + System.currentTimeMillis() + "." + GetFileExtension(FilePathUri));
storageReference2nd.putFile(FilePathUri)
.addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>()
{
@Override
public void onSuccess(UploadTask.TaskSnapshot taskSnapshot)
{
String sampleID = SamID.getText().toString().trim();
String sampleDate = DateText.getText().toString().trim();
String sampleTime = TimeText.getText().toString().trim();
String sampleLocation = LocText.getText().toString().trim();
progressDialog.dismiss();
Toast.makeText(getApplicationContext(), "Image Uploaded Successfully ", Toast.LENGTH_LONG).show();
@SuppressWarnings("VisibleForTests")
Sample sample = new Sample (sampleID,sampleDate,sampleTime,sampleLocation, taskSnapshot.getStorage().getDownloadUrl().toString());
databaseReference.child(sampleID).setValue(sample);
SamID.setText("");
DateText.setText("");
TimeText.setText("");
LocText.setText("");
Intent intent = new Intent(RegisterSample.this, SampleList.class);
startActivity(intent);
}
})
.addOnFailureListener(new OnFailureListener()
{
@Override
public void onFailure(@NonNull Exception exception)
{
progressDialog.dismiss();
Toast.makeText(RegisterSample.this, exception.getMessage(), Toast.LENGTH_LONG).show();
}
})
.addOnProgressListener(new OnProgressListener<UploadTask.TaskSnapshot>()
{
@Override
public void onProgress(UploadTask.TaskSnapshot taskSnapshot)
{
// Setting progressDialog Title.
progressDialog.setTitle("Image is Uploading...");
}
});
}
else
{
Toast.makeText(RegisterSample.this, "Please insert corresponding field", Toast.LENGTH_LONG).show();
}
}
}
我的数据库的屏幕截图： firebase database structure firebase storage structure
我需要图片显示在回收者视图活动中。
