我想在后台模式下的文本视图中显示Firebase通知消息，但是它只能在前台模式下显示。
我已经使用过broadcastReceiver。它正在工作，但仅在前台。如何使其在后台模式下工作？
这是我的Firebase Messaging Service类：
public class ProfileActivity extends AppCompatActivity {
TextView notificationTitle, notificationMessage;
public static final String NODE_USERS = "users";
private FirebaseAuth mAuth;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
LocalBroadcastManager.getInstance(this).registerReceiver(mHandler,new IntentFilter("com.example.linguanotification_FCM-MESSAGE"));
setContentView(R.layout.activity_profile);
notificationTitle=findViewById(R.id.title_notification);
notificationMessage=findViewById(R.id.notification_message);
mAuth = FirebaseAuth.getInstance();
FirebaseMessaging.getInstance().subscribeToTopic("updates");
FirebaseInstanceId.getInstance().getInstanceId()
.addOnCompleteListener(new OnCompleteListener<InstanceIdResult>() {
@Override
public void onComplete(@NonNull Task<InstanceIdResult> task) {
if (task.isSuccessful()) {
String token = task.getResult().getToken();
saveToken(token);
} else {
}
}
});
}
@Override
protected void onStart() {
super.onStart();
if (mAuth.getCurrentUser() == null) {
Intent intent = new Intent(this, MainActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);
}
}
private void saveToken(String token) {
String email = mAuth.getCurrentUser().getEmail();
User user = new User(email, token);
DatabaseReference dbUsers = FirebaseDatabase.getInstance().getReference(NODE_USERS);
dbUsers.child(mAuth.getCurrentUser().getUid())
.setValue(user).addOnCompleteListener(new OnCompleteListener<Void>() {
@Override
public void onComplete(@NonNull Task<Void> task) {
if (task.isSuccessful()) {
Toast.makeText(ProfileActivity.this, "Token Saved", Toast.LENGTH_LONG).show();
}
}
});
}
private BroadcastReceiver mHandler = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String title = intent.getStringExtra("title");
String message=intent.getStringExtra("message");
notificationTitle.setText(title);
notificationMessage.setText(message);
}
};
@Override
protected void onPause() {
super.onPause();
LocalBroadcastManager.getInstance(this).unregisterReceiver(mHandler);
}
}
public class MyFirebaseMessagingService extends FirebaseMessagingService {
@Override
public void onMessageReceived(RemoteMessage remoteMessage) {
super.onMessageReceived(remoteMessage);
if (remoteMessage.getNotification() != null) {
String title = remoteMessage.getNotification().getTitle();
String body = remoteMessage.getNotification().getBody();
NotificationHelper.displayNotification(getApplicationContext(), title, body);
}
if (remoteMessage.getData().size()>0)
{
String title = remoteMessage.getData().get("title");
String message= remoteMessage.getData().get("message");
Intent intent = new Intent("com.example.linguanotification_FCM-MESSAGE");
intent.putExtra("title",title);
intent.putExtra("message",message);
LocalBroadcastManager localBroadcastManager=LocalBroadcastManager.getInstance(this);
localBroadcastManager.sendBroadcast(intent);
}
}
}
public class NotificationHelper {
public static void displayNotification(Context context, String title, String body) {
Intent intent = new Intent(context, ProfileActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(
context,
100,
intent,
PendingIntent.FLAG_CANCEL_CURRENT
);
NotificationCompat.Builder mBuilder =
new NotificationCompat.Builder(context, MainActivity.CHANNEL_ID)
.setSmallIcon(R.drawable.dd)
.setContentTitle(title)
.setContentText(body)
.setContentIntent(pendingIntent)
.setAutoCancel(true)
.setPriority(NotificationCompat.PRIORITY_HIGH);
NotificationManagerCompat mNotificationMgr = NotificationManagerCompat.from(context);
mNotificationMgr.notify(1, mBuilder.build());
}
}
public class MainActivity extends AppCompatActivity {
//1. Notification Channel
//2. Notification Builder
//3. Notification Manager
public static final String CHANNEL_ID = "12";
public static final String CHANNEL_NAME = "23";
public static final String CHANNEL_DESC = "34";
private EditText editTextEmail, editTextPassword;
private ProgressBar progressBar;
private FirebaseAuth mAuth;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mAuth = FirebaseAuth.getInstance();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
NotificationChannel channel = new NotificationChannel(CHANNEL_ID, CHANNEL_NAME, NotificationManager.IMPORTANCE_DEFAULT);
channel.setDescription(CHANNEL_DESC);
NotificationManager manager = getSystemService(NotificationManager.class);
manager.createNotificationChannel(channel);
}
progressBar = findViewById(R.id.progressbar);
progressBar.setVisibility(View.INVISIBLE);
editTextEmail = findViewById(R.id.editTextEmail);
editTextPassword = findViewById(R.id.editTextPassword);
findViewById(R.id.buttonSignUp).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
createUser();
}
});
}
private void createUser() {
final String email = editTextEmail.getText().toString().trim();
final String password = editTextEmail.getText().toString().trim();
if (email.isEmpty()) {
editTextEmail.setError("Email required");
editTextEmail.requestFocus();
return;
}
if (password.isEmpty()) {
editTextPassword.setError("Password required");
editTextPassword.requestFocus();
return;
}
if (password.length() < 6) {
editTextPassword.setError("Password should be atleast 6 char long");
editTextPassword.requestFocus();
return;
}
progressBar.setVisibility(View.VISIBLE);
mAuth.createUserWithEmailAndPassword(email, password)
.addOnCompleteListener(new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
if (task.isSuccessful()) {
startProfileActivity();
}else{
if(task.getException() instanceof FirebaseAuthUserCollisionException){
userLogin(email, password);
}else{
progressBar.setVisibility(View.INVISIBLE);
Toast.makeText(MainActivity.this, task.getException().getMessage(), Toast.LENGTH_LONG).show();
}
}
}
});
}
private void userLogin(String email, String password){
mAuth.signInWithEmailAndPassword(email, password)
.addOnCompleteListener(new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
if(task.isSuccessful()){
startProfileActivity();
}else{
progressBar.setVisibility(View.INVISIBLE);
Toast.makeText(MainActivity.this, task.getException().getMessage(), Toast.LENGTH_LONG).show();
}
}
});
}
//here we are checking if the user is not null then the user already logged in
@Override
protected void onStart() {
super.onStart();
if (mAuth.getCurrentUser() != null)
{
startProfileActivity();
}
}
private void startProfileActivity() {
Intent intent = new Intent(this, ProfileActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);
}
}