私は(GETUID上のエラーを取得しています)エラーアンドロイドfirebase java.lang.NullPointerExceptionが
final String user_id = mAuth.getCurrentUser().getUid();
と、この私の活動のコードは:あなたがMauthのを初期化されていないため、
public class MainActivity extends AppCompatActivity {
private RecyclerView postList;
private DatabaseReference mDatabase;
private DatabaseReference mDatabaseUsers;
private FirebaseAuth mAuth;
private FirebaseAuth.AuthStateListener mAuthListener;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mAuth = FirebaseAuth.getInstance();
mAuthListener = new FirebaseAuth.AuthStateListener() {
@Override
public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
if (firebaseAuth.getCurrentUser() == null){
Intent loginIntent = new Intent(MainActivity.this, LoginActivity.class);
loginIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(loginIntent);
}
}
};
mDatabase = FirebaseDatabase.getInstance().getReference().child("Blog");
mDatabaseUsers = FirebaseDatabase.getInstance().getReference().child("Users");
mDatabase.keepSynced(true);
mDatabaseUsers.keepSynced(true);
postList = (RecyclerView) findViewById(R.id.post_list);
postList.setHasFixedSize(true);
LinearLayoutManager layoutManager = new LinearLayoutManager(this);
layoutManager.setReverseLayout(true);
layoutManager.setStackFromEnd(true);
postList.setLayoutManager(layoutManager);
}
@Override
protected void onStart() {
super.onStart();
CheckUserExist();
mAuth.addAuthStateListener(mAuthListener);
FirebaseRecyclerAdapter<Blog, BlogViewHolder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<Blog, BlogViewHolder>(
Blog.class,
R.layout.post_row,
BlogViewHolder.class,
mDatabase
) {
@Override
protected void populateViewHolder(BlogViewHolder viewHolder, Blog model, int position) {
viewHolder.setTitle(model.getTitle());
viewHolder.setDesc(model.getDescription());
viewHolder.setImage(getApplicationContext(), model.getImage());
}
};
postList.setAdapter(firebaseRecyclerAdapter);
}
private void CheckUserExist() {
final String user_id = mAuth.getCurrentUser().getUid();
mDatabaseUsers.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (!dataSnapshot.hasChild(user_id)){
Intent SetupIntent = new Intent(MainActivity.this, SetupActivity.class);
SetupIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(SetupIntent);
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
public static class BlogViewHolder extends RecyclerView.ViewHolder{
View mView;
public BlogViewHolder(View itemView) {
super(itemView);
mView = itemView;
}
public void setTitle(String title){
TextView post_title = (TextView) mView.findViewById(R.id.post_title);
post_title.setText(title);
}
public void setDesc(String desc){
TextView post_desc = (TextView) mView.findViewById(R.id.post_desc);
post_desc.setText(desc);
}
public void setImage(final Context ctx, final String image){
final ImageView post_image = (ImageView) mView.findViewById(R.id.post_img);
// Picasso.with(ctx).load(image).into(post_image);
Picasso.with(ctx).load(image).networkPolicy(NetworkPolicy.OFFLINE).into(post_image, new Callback() {
@Override
public void onSuccess() {
}
@Override
public void onError() {
Picasso.with(ctx).load(image).into(post_image);
}
});
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main_menu, menu);
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (item.getItemId() == R.id.action_add){
startActivity(new Intent(MainActivity.this, PostActivity.class));
}
if (item.getItemId() == R.id.action_logout){
logout();
}
return super.onOptionsItemSelected(item);
}
private void logout() {
mAuth.signOut();
}
}
CheckUserExist(); mAuth.addAuthStateListener(mAuthListener);この行の呼び出しをスワップするCheckUserExist(); mAuth.addAuthStateListener(mAuthListener)の後ろにあります。 –
はまだ同じエラーを取得します私はすべての活動/コードを投稿するかどうか、その活動についてエラーを表示しますか? – Ragils
があなたのエラーログ –