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データベースとしてfirebaseを使用しています。アクティビティが最初に読み込まれると、私のrecyclerviewは生成されませんが、時には複数のバックプレスでバックプレスアクションの後に生成されます。RecyclerViewアクティビティが読み込まれたときにリストビューが生成されないが、バックボタン（複数のバックプレス上で）を押したときに値が入力される
HomeActivity.java
public class HomeActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
//Recycler Contact list variables
private RecyclerView mContactList;
//Firebase Variables
private DatabaseReference rDatabase;
private FirebaseAuth mAuth;
private StorageReference mStorageRef;
private FirebaseAuth.AuthStateListener mAuthListener;
FirebaseUser user;
FirebaseRecyclerAdapter<ContactList,ContactListViewHolder> firebaseRecyclerAdapter;
//Request Contact Constant
private static final int REQUEST_READ_CONTACTS = 0;
private Long contactId;
private Uri downloadUrl = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
if (Build.VERSION.SDK_INT >= 23) {
//do your check here
mayRequestContacts();
}
//initialize Recycler view
mContactList = (RecyclerView) findViewById(R.id.contact_list);
mContactList.setHasFixedSize(true);
mContactList.setLayoutManager(new LinearLayoutManager(this));
//initialize UI elements
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
View headView = navigationView.getHeaderView(0);
TextView uName = (TextView)headView.findViewById(R.id.userName);
ImageView dPhoto = (ImageView)headView.findViewById(R.id.imageView);
TextView mEmail = (TextView)headView.findViewById(R.id.uEmail);
//initialize Firebase variables
mStorageRef = FirebaseStorage.getInstance().getReference();
user = FirebaseAuth.getInstance().getCurrentUser();
rDatabase = FirebaseDatabase.getInstance().getReference().child("users").child(user.getUid()).child(user.getDisplayName()).child("contacts");
mAuth = FirebaseAuth.getInstance();
mAuthListener = new FirebaseAuth.AuthStateListener() {
@Override
public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
FirebaseUser user = firebaseAuth.getCurrentUser();
if (user == null) {
// user auth state is changed - user is null
// launch login activity
startActivity(new Intent(HomeActivity.this, LoginActivity.class));
finish();
}
}
};
if (user != null) {
// Name, email address, and profile photo Url
String name = user.getDisplayName();
String email = user.getEmail();
Uri photoUrl = user.getPhotoUrl();
System.out.println(name);
if(name!=null) {
uName.setText(name);
mEmail.setText(email);
}
if(photoUrl!=null){
Picasso.with(this)
.load(photoUrl)
.into(dPhoto);
}
// The user's ID, unique to the Firebase project. Do NOT use this value to
// authenticate with your backend server, if you have one. Use
// FirebaseUser.getToken() instead.
}
//initialize FirebaseRecyclerAdapter
firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<ContactList, ContactListViewHolder>(
ContactList.class,
R.layout.contact_list_row,
ContactListViewHolder.class,
rDatabase
) {
@Override
protected void populateViewHolder(ContactListViewHolder viewHolder, ContactList model, int position) {
viewHolder.setName(model.getName());
viewHolder.setPhone(model.getPhone());
}
};
mContactList.setAdapter(firebaseRecyclerAdapter); //set adapter for recycler view
setSupportActionBar(toolbar); //instantiate toolbar
//initialize floating action button
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with add contact or agenda", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
//initialize navigation drawer
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle mDrawerToggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.addDrawerListener(mDrawerToggle);
mDrawerToggle.syncState();
navigationView.setNavigationItemSelectedListener(this); //listen if any item selected
}
@Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_importContacts) {
// Handle the Import Contacts Action
final ProgressDialog ringProgressDialog = ProgressDialog.show(HomeActivity.this, "Please Wait", "Importing Contacts", true);
ringProgressDialog.setCancelable(true);
new Thread(new Runnable() {
@Override
public void run() {
try {
//user = FirebaseAuth.getInstance().getCurrentUser(); //Get the currently logged in user information
//Uid = user.getUid(); //Get User ID
//UName = user.getDisplayName();
//Initialize cursor to import contacts
ContentResolver cr = getContentResolver();
Cursor cur = cr.query(ContactsContract.Contacts.CONTENT_URI,
null, null, null, null);
assert cur != null;
if (cur.getCount() > 0) {
while (cur.moveToNext()) {
//Get current Contact ID
contactId=cur.getLong(cur.getColumnIndex(ContactsContract.Contacts._ID));
//Get current Contact Name
String cName = cur.getString(cur.getColumnIndex(
ContactsContract.Contacts.DISPLAY_NAME));
//Get Current Contact URI
Uri contactUri = ContentUris.withAppendedId(ContactsContract.Contacts.CONTENT_URI, contactId);
//Get Current Contact Photo Uri
Uri displayPhotoUri=null;
if(Uri.withAppendedPath(contactUri, ContactsContract.Contacts.Photo.DISPLAY_PHOTO)!=null){
displayPhotoUri = Uri.withAppendedPath(contactUri, ContactsContract.Contacts.Photo.DISPLAY_PHOTO);
}
try {
AssetFileDescriptor fd =
getContentResolver().openAssetFileDescriptor(displayPhotoUri, "r");
} catch (IOException e) {
// return null;
}
if(contactId!=null && cName!=null && displayPhotoUri!=null){
boolean flag = true;
Cursor emailCursor = cr.query(ContactsContract.CommonDataKinds.Email.CONTENT_URI,
null,
ContactsContract.CommonDataKinds.Email.CONTACT_ID + " = ?", new String[] {contactId.toString()}, null);
if(cur.getInt(cur.getColumnIndex(
ContactsContract.Contacts.HAS_PHONE_NUMBER)) <=0){
flag = false;
}
else{
//Import Contact Photo
StorageReference filepath = mStorageRef.child("users/"+user.getUid()+"/"+contactId+"/contactPhoto").child(displayPhotoUri.getLastPathSegment());
filepath.putFile(displayPhotoUri).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
@Override
public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
// System.out.println(photoUri.toString()); //debug point
downloadUrl = taskSnapshot.getDownloadUrl();
rDatabase.child(contactId.toString()).child("photoUrl").setValue(downloadUrl.toString());
}
}).addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
}
});
//Import Contact Email ID if Any
assert emailCursor != null;
while (emailCursor.moveToNext())
{
String cEmail = emailCursor.getString(emailCursor.getColumnIndex(ContactsContract.CommonDataKinds.Email.DATA));
int type = emailCursor.getInt(emailCursor.getColumnIndex(ContactsContract.CommonDataKinds.Email.DATA));
rDatabase.child(contactId.toString()).child("email").setValue(cEmail);
}
emailCursor.close();
Cursor pCur = cr.query(
ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
null,
ContactsContract.CommonDataKinds.Phone.CONTACT_ID +" = ?",
new String[]{contactId.toString()}, null);
while (pCur.moveToNext()) {
String phoneNo = pCur.getString(pCur.getColumnIndex(
ContactsContract.CommonDataKinds.Phone.NUMBER));
//Import Contact Phone No.
rDatabase.child(contactId.toString()).child("phone").setValue(phoneNo);
//Import Contact Name
rDatabase.child(contactId.toString()).child("name").setValue(cName);
}
pCur.close();
}}
}
} cur.close();
Thread.sleep(10000);
} catch (Exception e) {
return;
}
ringProgressDialog.dismiss();
}
}).start();
} else if (id == R.id.nav_logout) {
mAuth.signOut(); //Log out user method
} else if (id == R.id.nav_send) {
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
//Method to request contacts (Required for API 23 and greater)
private boolean mayRequestContacts() {
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
return true;
}
if (checkSelfPermission(READ_CONTACTS) == PackageManager.PERMISSION_GRANTED) {
return true;
}
if (shouldShowRequestPermissionRationale(READ_CONTACTS)) {
if (checkSelfPermission(Manifest.permission.READ_CONTACTS) == PackageManager.PERMISSION_GRANTED) {
Toast.makeText(HomeActivity.this, "Permission Granted",
Toast.LENGTH_LONG).show();
//File write logic here
return true;
}
} else {
requestPermissions(new String[]{READ_CONTACTS}, REQUEST_READ_CONTACTS);
}
return false;
}
public void onStart() {
super.onStart();
mAuth.addAuthStateListener(mAuthListener); //Listen to current user Login status
mContactList.setAdapter(firebaseRecyclerAdapter); //Set adapter for contact list recycler view
}
@Override
public void onStop() {
super.onStop();
if (mAuthListener != null) {
mAuth.removeAuthStateListener(mAuthListener);
}
}
//ViewHolder for ContactList Recycler View
public static class ContactListViewHolder extends RecyclerView.ViewHolder{
View mView;
TextView contact_Name;
TextView contact_Phone;
public ContactListViewHolder(View itemView) {
super(itemView);
mView = itemView;
}
public void setName(String name){
contact_Name = (TextView) itemView.findViewById(R.id.ContactName);
contact_Name.setText(name);
}
public void setPhone(String phone){
contact_Phone = (TextView) itemView.findViewById(R.id.ContactPhone);
contact_Phone.setText(phone);
}
}
}
アダプタクラス
public class ContactList {
private String name;
private String phone;
public ContactList(){}
public ContactList(String name, String phone) {
this.name = name;
this.phone = phone;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
content_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:id="@+id/content_main"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="neeti.contactapp.HomeActivity"
tools:showIn="@layout/activity_main">
<android.support.v7.widget.RecyclerView
android:id="@+id/contact_list"
android:scrollbars="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</RelativeLayout>
contact_list_row.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:focusable="true"
android:paddingLeft="16dp"
android:paddingRight="16dp"
android:paddingTop="10dp"
android:paddingBottom="10dp"
android:clickable="true"
android:background="?android:attr/selectableItemBackground"
android:orientation="vertical">
<TextView
android:id="@+id/ContactName"
android:textColor="@color/ContactName"
android:textSize="16dp"
android:textStyle="bold"
android:layout_alignParentTop="true"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<TextView
android:id="@+id/ContactPhone"
android:layout_below="@id/ContactName"
android:textColor="@color/ContactPhone"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</RelativeLayout>
ありがとう！ –