我正在使用Java和Firebase开发一个android应用程序。我想编辑和更新存储在Firebase数据库中的数据。为此，我正在使用一个对话框，可以在其中检索数据并进行更新。
这是我的编码。
适配器类。
public class AdminAdapter extends RecyclerView.Adapter<AdminAdapter.AdminHolder> {
UpdateInterface updateInterface;
String noteId="",noteDate="";
private Context mContext;
private List<Upload> mUploads;
public AdminAdapter(Context context,List<Upload> uploads){
mContext = context;
mUploads = uploads;
updateInterface = (UpdateInterface)mContext;
}
@NonNull
@Override
public AdminHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(mContext).inflate(R.layout.admin_card_view,parent,false);
return new AdminAdapter.AdminHolder(v);
}
@Override
public void onBindViewHolder(@NonNull AdminHolder holder, final int position) {
final Upload uploadCurrent = mUploads.get(position);
holder.admTitle.setText(uploadCurrent.getTitle());
holder.admDesc.setText(uploadCurrent.getDescription());
holder.admDate.setText(uploadCurrent.getDate());
holder.admTime.setText(uploadCurrent.getTime());
holder.admSentDate.setText(uploadCurrent.getSentDate());
Picasso.get()
.load(uploadCurrent.getImage())
.fit()
.centerInside()
.into(holder.admImage);
holder.admEdit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Upload upload = mUploads.get(position);
showDialog(upload);
}
});
holder.admDelete.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Upload upload = mUploads.get(position);
confirmDeleteDialog(upload);
}
});
}
@Override
public int getItemCount() {
return mUploads.size();
}
public class AdminHolder extends RecyclerView.ViewHolder{
public TextView admTitle,admDesc,admDate,admTime,admSentDate;
public ImageView admImage;
public ImageView admEdit,admDelete;
public AdminHolder(@NonNull View itemView) {
super(itemView);
admTitle = itemView.findViewById(R.id.admTitle);
admDesc = itemView.findViewById(R.id.admDesc);
admDate = itemView.findViewById(R.id.admDate);
admTime = itemView.findViewById(R.id.admTime);
admSentDate = itemView.findViewById(R.id.admSentTime);
admImage = itemView.findViewById(R.id.admImage);
admEdit = itemView.findViewById(R.id.admEditBtn);
admDelete = itemView.findViewById(R.id.admDeleteBtn);
}
}
public void showDialog(Upload uploadOb){
String imageUrl = null;
final Dialog dialog = new Dialog((mContext));
dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
dialog.setContentView(R.layout.dialog_edit);
dialog.show();
Window window = dialog.getWindow();
window.setLayout(ConstraintLayout.LayoutParams.MATCH_PARENT, ConstraintLayout.LayoutParams.WRAP_CONTENT );
final EditText editTitle = dialog.findViewById(R.id.admEditTitle);
final EditText editDesc = dialog.findViewById(R.id.admEditDescription);
final EditText editDate = dialog.findViewById(R.id.admEditDate);
final EditText editTime = dialog.findViewById(R.id.admEditTime);
final ImageView editImage = dialog.findViewById(R.id.admEditImage);
editTitle.setText(uploadOb.getTitle());
editDesc.setText(uploadOb.getDescription());
editDate.setText(uploadOb.getDate());
editTime.setText(uploadOb.getTime());
imageUrl = uploadOb.getImage();
Picasso.get().load(imageUrl).into(editImage);
editImage.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent chooseImage = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
}
});
noteId=uploadOb.getMsgKey();
Button buttonUpdate = dialog.findViewById(R.id.admEditDoneBtn);
final String finalImageUrl = imageUrl;
buttonUpdate.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dialog.dismiss();
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("dd MMM yyyy");
Calendar calendar = Calendar.getInstance();
noteDate = simpleDateFormat.format(calendar.getTime());
String title = editTitle.getText().toString();
String description = editDesc.getText().toString();
String date = editDate.getText().toString();
String time = editTime.getText().toString();
Upload upload = new Upload(title,description,date,time, finalImageUrl,noteDate,noteId);
updateInterface.UpdateEvents(upload);
}
});
}
public void confirmDeleteDialog(final Upload upload){
final Dialog dialog = new Dialog((mContext));
dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
dialog.setContentView(R.layout.dialog_delete);
dialog.show();
TextView delete = dialog.findViewById(R.id.admDelete);
TextView cancel = dialog.findViewById(R.id.admCancel);
cancel.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dialog.dismiss();
}
});
delete.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
updateInterface.DeleteEvents(upload);
dialog.dismiss();
}
});
}
}
接口
public interface UpdateInterface {
public void UpdateEvents(Upload upload);
public void DeleteEvents(Upload upload);
}
模型类。
public class Upload {
private String mTitle;
private String mDescription;
private String mDate;
private String mTime;
private String imageUrl;
private String sentDate;
private String msgKey;
public Upload() {
}
public Upload(String title,String desc,String date,String time,String image, String sDate,String mKey){
mTitle = title;
mDescription = desc;
mDate = date;
mTime = time;
imageUrl = image;
sentDate = sDate;
msgKey = mKey;
}
public String getTitle(){
return mTitle;
}
public void setTitle(String title){
mTitle = title;
}
public String getDescription(){
return mDescription;
}
public void setDescription(String desc){
mDescription = desc;
}
public String getDate(){
return mDate;
}
public void setDate(String date){
mDate = date;
}
public String getTime(){
return mTime;
}
public void setTime(String time){
mTime = time;
}
public String getImage(){
return imageUrl;
}
public void setImage(String image){
imageUrl = image;
}
public String getSentDate() {
return sentDate;
}
public void setSentDate(String sDate) {
this.sentDate = sDate;
}
public String getMsgKey() {
return msgKey;
}
public void setMsgKey(String msgKey) {
this.msgKey = msgKey;
}
}
主要活动。
public class MainActivityAdminEdit extends AppCompatActivity implements UpdateInterface{
private RecyclerView mRecyclerView;
private AdminAdapter mAdapter;
private ProgressBar mProgressCircle;
private DatabaseReference mDatabaseRef;
private ArrayList<Upload> mUploads = new ArrayList<>();;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_admin_edit);
assert getSupportActionBar() != null;
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
mRecyclerView = findViewById(R.id.admRecyclerView);
mRecyclerView.setHasFixedSize(true);
mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
mProgressCircle = findViewById(R.id.admProgressCircle);
mDatabaseRef = FirebaseDatabase.getInstance().getReference("MESSAGES");
mDatabaseRef.keepSynced(true);
read();
}
private void read(){
mDatabaseRef.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
mUploads.clear();
for (DataSnapshot postSnapshot : dataSnapshot.getChildren()) {
Upload upload = postSnapshot.getValue(Upload.class);
mUploads.add(upload);
}
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(MainActivityAdminEdit.this);
linearLayoutManager.setReverseLayout(true);
linearLayoutManager.setStackFromEnd(true);
mRecyclerView.setLayoutManager(linearLayoutManager);
mAdapter = new AdminAdapter(MainActivityAdminEdit.this,mUploads);
mRecyclerView.setAdapter(mAdapter);
mProgressCircle.setVisibility(View.INVISIBLE);
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
Toast.makeText(MainActivityAdminEdit.this, databaseError.getMessage(), Toast.LENGTH_SHORT).show();
mProgressCircle.setVisibility(View.INVISIBLE);
}
});
}
@Override
public void UpdateEvents(Upload upload) {
mDatabaseRef.child(upload.getMsgKey()).setValue(upload).addOnCompleteListener(new OnCompleteListener<Void>() {
@Override
public void onComplete(@NonNull Task<Void> task) {
if (task.isSuccessful()){
Toast.makeText(MainActivityAdminEdit.this, "Update Successful", Toast.LENGTH_SHORT).show();
read();
} else {
Toast.makeText(MainActivityAdminEdit.this, "Error", Toast.LENGTH_SHORT).show();
}
}
});
}
@Override
public void DeleteEvents(Upload upload) {
mDatabaseRef.child(upload.getMsgKey()).removeValue().addOnCompleteListener(new OnCompleteListener<Void>() {
@Override
public void onComplete(@NonNull Task<Void> task) {
if (task.isSuccessful()){
Toast.makeText(MainActivityAdminEdit.this, "Successfully deleted", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(MainActivityAdminEdit.this, "Error", Toast.LENGTH_SHORT).show();
}
}
});
}
}
对话框XML。
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="10dp"
android:gravity="center">
<com.google.android.material.textfield.TextInputLayout
android:id="@+id/editTitle"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<com.google.android.material.textfield.TextInputEditText
android:id="@+id/admEditTitle"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="@string/edit_title"
android:inputType="textCapSentences"
android:lines="2"
android:maxLines="2"/>
</com.google.android.material.textfield.TextInputLayout>
<com.google.android.material.textfield.TextInputLayout
android:id="@+id/editDescription"
android:layout_width="match_parent"
android:layout_height="150dp"
android:layout_marginTop="20dp"
android:hint="@string/edit_description"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/editTitle">
<com.google.android.material.textfield.TextInputEditText
android:id="@+id/admEditDescription"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="textMultiLine"
android:lines="8"
android:minLines="6"
android:gravity="top|start"
android:scrollbars="vertical"/>
</com.google.android.material.textfield.TextInputLayout>
<EditText
android:id="@+id/admEditDate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:hint="@string/edit_date"
android:ems="10"
android:inputType="date"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/editDescription"
android:importantForAutofill="no" />
<EditText
android:id="@+id/admEditTime"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:hint="@string/edit_time"
android:ems="10"
android:inputType="datetime"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/admEditDate"
android:importantForAutofill="no" />
<ImageView
android:id="@+id/admEditImage"
android:layout_width="150dp"
android:layout_height="150dp"
android:src="@drawable/ic_image_black_24dp"
android:layout_marginTop="20dp"
android:outlineProvider="background"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/admEditTime"
tools:ignore="ContentDescription" />
<Button
android:id="@+id/admEditDoneBtn"
android:layout_width="120dp"
android:layout_height="40dp"
android:layout_marginBottom="50dp"
android:background="@drawable/sample"
android:text="@string/done_btn"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
我在Dialog的ImageView中添加了onClickListener。当我单击它时，它希望从图库中选择图像并显示它，并询问权限。但这不起作用。如果您知道任何解决方案，将非常有帮助。