我有一些奇怪的情况：
我有3个活动-MainFeed，可以在其中发布一些带有说明的图片，然后对其进行评论， PostActivity，从这里我实际上传图像并写一些单词，然后在MainFeed中自动更新 CommentActivity，从这里我只在相关帖子中写评论。
问题是-当我仅滚动查看帖子并单击以写评论并写一个时-一切都已被更新，但是一旦我上传了新的POST，然后在单击“更新评论”按钮时对任何帖子发表了评论我刚刚移到Postactivity ...我需要单击android后退按钮，然后才能看到我的所有评论。
据我了解，后期活动不会使用finish（）方法关闭。
任何帮助，请!!
package com.example.android.bluesky.Posts;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.text.TextUtils;
import android.view.View;
import android.view.inputmethod.InputMethodManager;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import com.example.android.bluesky.Login.LoginActivity;
import com.example.android.bluesky.Login.RegisterActivity;
import com.example.android.bluesky.R;
import com.firebase.ui.database.FirebaseRecyclerAdapter;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.Query;
import com.google.firebase.database.ValueEventListener;
import com.squareup.picasso.Picasso;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.HashMap;
import java.util.Locale;
import de.hdodenhof.circleimageview.CircleImageView;
import static java.nio.file.Paths.get;
public class CommentsActivity extends AppCompatActivity
{
private ImageView PostCommentButton,BackButton;
private EditText CommentInputText;
private RecyclerView CommentsList;
private String Post_Key, current_user_id;
private long countPosts;
private DatabaseReference UsersRef,PostsRef;
private FirebaseAuth mAuth;
private String currentUserID, CommentRandomKey,post_user_uid_for_comment;
private int PostIntKeyFromMain;
private String comment_user_uid;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_comments);
Post_Key=getIntent().getExtras().get("Post_Key").toString();
PostIntKeyFromMain =getIntent().getIntExtra("PostIntKey",5);
post_user_uid_for_comment=getIntent().getExtras().get("post_user_uid_for_comment").toString(); //Coming from mainfeed - commentPostButton
Toast.makeText(this, "received: "+post_user_uid_for_comment, Toast.LENGTH_SHORT).show();
UsersRef= FirebaseDatabase.getInstance().getReference().child("users");
mAuth=FirebaseAuth.getInstance();
current_user_id=mAuth.getCurrentUser().getUid();
currentUserID = mAuth.getCurrentUser().getUid();
PostsRef = FirebaseDatabase.getInstance().getReference().child("Posts").child(Post_Key).child("comments");
BackButton=(ImageView) findViewById(R.id.backArrow) ;
CommentsList = (RecyclerView) findViewById(R.id.comment_list);
CommentsList.setHasFixedSize(true);
LinearLayoutManager linearLayoutManager= new LinearLayoutManager(this);
linearLayoutManager.setReverseLayout(true);
linearLayoutManager.setStackFromEnd(true);
CommentsList.setLayoutManager(linearLayoutManager);
CommentInputText=(EditText) findViewById(R.id.comment_input);
PostCommentButton=(ImageView) findViewById(R.id.post_comment_button1);
BackButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent=new Intent(CommentsActivity.this,MainFeedActivity.class);
intent.putExtra("PostIntKeyFromComment", PostIntKeyFromMain);
startActivity(intent);
finish();
}
});
PostCommentButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view)
{
UsersRef.child(current_user_id).addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
if(dataSnapshot.exists())
{
String userFullname=dataSnapshot.child("name").getValue().toString().toLowerCase()+"."+dataSnapshot.child("lastname").getValue().toString();
String userProfileimage=dataSnapshot.child("profileimage").getValue().toString();
ValidateComment(userFullname,userProfileimage);
CommentsList.smoothScrollToPosition(0);
CommentInputText.setText("");
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
});
}
@Override
protected void onStart()
{
super.onStart();
PostsRef.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (dataSnapshot.exists()) {
countPosts = dataSnapshot.getChildrenCount();
countPosts=100000-countPosts;
} else {
countPosts = 100000;
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
Query SortCommentsInDecendingOrder = PostsRef.orderByChild("counterC");
FirebaseRecyclerAdapter<Comments,CommentsViewHolder> firebaseRecyclerAdapter=new FirebaseRecyclerAdapter<Comments, CommentsViewHolder>
(
Comments.class,
R.layout.all_comments_layout,
CommentsViewHolder.class,
SortCommentsInDecendingOrder
) {
@Override
protected void populateViewHolder(CommentsViewHolder viewHolder, Comments model, int position)
{
final String CommentKey = getRef(position).getKey();
//viewHolder.setUsername(model.getUsername());
viewHolder.setComment(model.getComment());
viewHolder.setDate(model.getDate());
viewHolder.setTime(model.getTime());
viewHolder.setLastname(model.getLastname());
viewHolder.setProfileimage(model.getProfileimage());
}
};
CommentsList.setAdapter(firebaseRecyclerAdapter);
}
public static class CommentsViewHolder extends RecyclerView.ViewHolder
{
View mView;
String currentUserID;
public CommentsViewHolder(View itemView) {
super(itemView);
mView=itemView;
currentUserID = FirebaseAuth.getInstance().getCurrentUser().getUid();
}
public void setLastname(String lastname)
{
TextView myUserName=(TextView) mView.findViewById(R.id.comment_username1);
myUserName.setText("@ " + lastname);
}
public void setComment(String comment)
{
TextView myComment=(TextView) mView.findViewById(R.id.comment_text);
myComment.setText(comment);
}
public void setDate(String date)
{
TextView myDate=(TextView) mView.findViewById(R.id.comment_date);
myDate.setText(date);
}
public void setTime(String time)
{
TextView myTime=(TextView) mView.findViewById(R.id.comment_time);
myTime.setText(time);
}
public void setProfileimage(String profileimage) {
CircleImageView myProfileImage = (CircleImageView) mView.findViewById(R.id.comment_profile_image);
Picasso.get().load(profileimage).into(myProfileImage);
}
}
private void ValidateComment(String userFullname, String userProfileimage, String userCountryimage,String userPartyimage )
{
String commentText=CommentInputText.getText().toString();
if(TextUtils.isEmpty(commentText))
{
Toast.makeText(this, "Please write text", Toast.LENGTH_SHORT).show();
}
else
{
Calendar calForDate = Calendar.getInstance();
SimpleDateFormat currentDate = new SimpleDateFormat("dd-MMMM-yyyy");
final String saveCurrentDate = currentDate.format(calForDate.getTime());
Calendar calForTimeSS = Calendar.getInstance();
SimpleDateFormat currentTimeSS = new SimpleDateFormat("HH:mm:ss");
final String saveCurrentTimeSS = currentTimeSS.format(calForDate.getTime());
Calendar calForTime = Calendar.getInstance();
SimpleDateFormat currentTime = new SimpleDateFormat("HH:mm");
final String saveCurrentTime = currentTime.format(calForDate.getTime());
final String RandomKey =current_user_id+ saveCurrentDate + saveCurrentTimeSS;
CommentRandomKey=RandomKey;
HashMap commentsMap = new HashMap();
commentsMap.put("uid",current_user_id);
commentsMap.put("comment",commentText);
commentsMap.put("date",saveCurrentDate);
commentsMap.put("time",saveCurrentTime);
commentsMap.put("lastname",userFullname);
commentsMap.put("counterC", countPosts);
commentsMap.put("profileimage", userProfileimage);
PostsRef.child(RandomKey).updateChildren(commentsMap).addOnCompleteListener(new OnCompleteListener()
{
@Override
public void onComplete(@NonNull Task task) {
if(task.isSuccessful())
{
Toast.makeText(CommentsActivity.this, "You have commented successfully", Toast.LENGTH_SHORT).show();
}
else
{
Toast.makeText(CommentsActivity.this, "Error occured, try again...", Toast.LENGTH_SHORT).show();
}
}
});
CommentsList.smoothScrollToPosition(0);
// Toast.makeText(CommentsActivity.this, ""+CurrentCommentKey, Toast.LENGTH_SHORT).show();
}
}
}
package com.example.android.bluesky.Posts;
import java.lang.Math;
import android.app.ProgressDialog;
import android.content.Intent;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.RequiresApi;
import android.support.design.widget.FloatingActionButton;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.text.TextUtils;
import android.view.View;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;
import com.example.android.bluesky.R;
import com.example.android.bluesky.Utils.SquareImageView;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;
import com.google.firebase.storage.FirebaseStorage;
import com.google.firebase.storage.StorageReference;
import com.google.firebase.storage.UploadTask;
import com.theartofdev.edmodo.cropper.CropImage;
import com.theartofdev.edmodo.cropper.CropImageView;
import java.math.BigDecimal;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.HashMap;
import de.hdodenhof.circleimageview.CircleImageView;
public class PostActivity extends AppCompatActivity {
private Toolbar mToolbar;
private ProgressDialog loadingBar;
//private ImageButton SelectPostImage;
private SquareImageView SelectPostImage;
private FloatingActionButton DonePostButton;
private FloatingActionButton UpdatePostButton;
private EditText PostDescription;
private long countPosts;
ImageView PartyImage;
private static final int Gallery_Pick = 1;
private Uri ImageUri;
private String Description;
//referense to store in firebase storage
private StorageReference PostsImagesReference;
private DatabaseReference UsersRef, PostsRef;
private FirebaseAuth mAuth;
private String saveCurrentDate, saveCurrentTime,saveCurrentTimeS, postRandomName, downloadUrl, current_user_id;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_post);
//This two lines is to get current user from database
mAuth = FirebaseAuth.getInstance();
current_user_id = mAuth.getCurrentUser().getUid();
PostsImagesReference = FirebaseStorage.getInstance().getReference();
UsersRef = FirebaseDatabase.getInstance().getReference().child("users");
PostsRef = FirebaseDatabase.getInstance().getReference().child("Posts");
UserPhotosRef=FirebaseDatabase.getInstance().getReference().child("user_photos");
PhotosRef=FirebaseDatabase.getInstance().getReference().child("photos");
DonePostButton = (FloatingActionButton) findViewById(R.id.done_post_button);
SelectPostImage = (SquareImageView) findViewById(R.id.select_post_image);
UpdatePostButton = (FloatingActionButton) findViewById(R.id.update_post_button);
PostDescription = (EditText) findViewById(R.id.post_description);
PartyImage=(ImageView) findViewById(R.id.user_party_flag);
loadingBar = new ProgressDialog(this);
mToolbar = (Toolbar) findViewById(R.id.update_post_page_toolbar);
setSupportActionBar(mToolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowHomeEnabled(true);
getSupportActionBar().setTitle("Update post");
UpdatePostButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
onSelectImageClick(SelectPostImage);
// OpenGallery();
}
});
//UpdatePostButton.setOnClickListener(new View.OnClickListener() {
DonePostButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
ValidatePostInfo();
}
});
}
public void onSelectImageClick(View view) {
CropImage.activity()
.setGuidelines(CropImageView.Guidelines.ON)
.setActivityTitle("My Crop")
//.setCropShape(CropImageView.CropShape.RECTANGLE)
.setCropMenuCropButtonTitle("Done")
//.setMaxCropResultSize(1000, 1000)
.setMinCropWindowSize(2000, 2000)
.setMinCropResultSize(2000, 2000)
.setRequestedSize(800, 800)
.setAspectRatio(1,1)
.setCropMenuCropButtonIcon(R.drawable.ic_checkmark)
.start(this);
//.startActivityForResult(galleryIntent,Gallery_Pick);
// / .start(getContext(),this);
}
private void ValidatePostInfo() {
//This Description var is using only in this method, there is another one for global use
Description = PostDescription.getText().toString();
if (ImageUri == null) {
Toast.makeText(this, "Please select post image", Toast.LENGTH_SHORT).show();
} else if (TextUtils.isEmpty(Description)) {
Toast.makeText(this, "Please say something about your image", Toast.LENGTH_SHORT).show();
} else {
loadingBar.setTitle("Add new post");
loadingBar.setMessage("Please wait, while we are updating your new post...");
loadingBar.show();
loadingBar.setCanceledOnTouchOutside(true);
//Code for storing image in firebase storage and database
StoringImageToFirebaseStorage();
}
}
private void StoringImageToFirebaseStorage() {
//assigning random uid for image based on date and time
Calendar calForDate = Calendar.getInstance();
SimpleDateFormat currentDate = new SimpleDateFormat("dd-MMMM-yyyy");
saveCurrentDate = currentDate.format(calForDate.getTime());
Calendar calForTime = Calendar.getInstance();
SimpleDateFormat currentTime = new SimpleDateFormat("HH:mm");
saveCurrentTime = currentTime.format(calForDate.getTime());
Calendar calForTimeS = Calendar.getInstance();
SimpleDateFormat currentTimeS = new SimpleDateFormat("HH:mm:ss");
saveCurrentTimeS = currentTime.format(calForDate.getTime());
postRandomName = saveCurrentDate + saveCurrentTimeS;
StorageReference filepath = PostsImagesReference.child("Post Images").child(ImageUri.getLastPathSegment() + postRandomName + ".jpg");
//Now let's store the image to firebase storage
filepath.putFile(ImageUri).addOnCompleteListener(new OnCompleteListener<UploadTask.TaskSnapshot>() {
@Override
public void onComplete(@NonNull Task<UploadTask.TaskSnapshot> task) {
if (task.isSuccessful()) {
downloadUrl = task.getResult().getDownloadUrl().toString();
Toast.makeText(PostActivity.this, "Image uploaded successfully to Storage", Toast.LENGTH_SHORT).show();
SavingPostInformationToDatabase();
} else {
String message = task.getException().getMessage();
Toast.makeText(PostActivity.this, "Error occured: " + message, Toast.LENGTH_SHORT).show();
}
}
});
}
private void SavingPostInformationToDatabase()
{
PostsRef.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (dataSnapshot.exists()) {
countPosts = dataSnapshot.getChildrenCount();
// countForPhotos="photo_"+countPosts;
} else {
countPosts = 0;
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
UsersRef.child(current_user_id).addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (dataSnapshot.exists()) {
//Two lines of code to retreive and assign to var the users fullname and uid of it profile image
String userFullName = "@" + dataSnapshot.child("name").getValue().toString().toLowerCase() + "." + dataSnapshot.child("lastname").getValue().toString();
String userProfileImage = dataSnapshot.child("profileimage").getValue().toString();
//Creating database for storing user posts data including users data
HashMap postsMap = new HashMap();
postsMap.put("uid", current_user_id);
postsMap.put("description", Description);
postsMap.put("postimage", downloadUrl);
postsMap.put("profileimage", userProfileImage);
postsMap.put("fullname", userFullName);
postsMap.put("counter", countPosts);
//Updating database of users post photo only
UserPhotosRef.child(current_user_id).child(current_user_id + postRandomName).updateChildren(postsMap_users_photo);
PostsRef.child(current_user_id + postRandomName).updateChildren(postsMap)
.addOnCompleteListener(new OnCompleteListener()
{
@Override
public void onComplete(@NonNull Task task) {
if (task.isSuccessful()) {
SendUserToMainActivity();
Toast.makeText(PostActivity.this, "The post is updated successfully!", Toast.LENGTH_SHORT).show();
loadingBar.dismiss();
finish();
} else {
Toast.makeText(PostActivity.this, "Error occurred while updating your post!", Toast.LENGTH_SHORT).show();
loadingBar.dismiss();
}
}
});
} else {
String userFullName = dataSnapshot.child("lastname").getValue().toString();
Toast.makeText(PostActivity.this, "You have a problem!!! " + userFullName, Toast.LENGTH_SHORT).show();
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == CropImage.CROP_IMAGE_ACTIVITY_REQUEST_CODE) {
CropImage.ActivityResult result = CropImage.getActivityResult(data);
if (resultCode == RESULT_OK)
{
SelectPostImage.setImageURI(result.getUri());
Toast.makeText(this, "Cropping successful, Sample: " + result.getSampleSize(), Toast.LENGTH_LONG)
.show();
Uri resultUri = result.getUri();
ImageUri = resultUri;
}
else if (resultCode == CropImage.CROP_IMAGE_ACTIVITY_RESULT_ERROR_CODE) {
Toast.makeText(this, "Cropping failed: " + result.getError(), Toast.LENGTH_LONG).show();
}
}
}
private void SendUserToMainActivity() {
Intent intent = new Intent(PostActivity.this, MainFeedActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);
finish();
}
}
答案 0 :(得分：0)
问题出在Firebase初始化中的sendActivity ...