new Thread(new Runnable() { @Override public void run() { String result = "the output of some long-running compute"; // 結果で何をするか考えましょう… } }).start();
final TaskCompletionSource<String> source = new TaskCompletionSource<>(); new Thread(new Runnable() { @Override public void run() { String result = "the output of some long-running compute"; source.setResult(result); } }).start(); Task<String> task = source.getTask(); task.addOnCompleteListener(new OnCompleteListener<String>() { ... });
Task<Void> Tasks.whenAll(Collection<? extends Task<?>> tasks) Task<Void> Tasks.whenAll(Task...<?> tasks)
private Task<Void> fetchTask; // onCreate の中で: fetchTask = FirebaseRemoteConfig.getInstance().fetch();
private TaskCompletionSource<DataSnapshot> dbSource = new TaskCompletionSource<>(); private Task dbTask = dbSource.getTask(); // onCreate の中で: DatabaseReference ref = FirebaseDatabase.getInstance().getReference("/data/of/interest"); ref.addListenerForSingleValueEvent(new ValueEventListener() { @Override public void onDataChange(DataSnapshot dataSnapshot) { dbSource.setResult(dataSnapshot); } @Override public void onCancelled(DatabaseError databaseError) { dbSource.setException(databaseError.toException()); } });
private TaskCompletionSource<Void> delaySource = new TaskCompletionSource<>(); private Task<Void> delayTask = delaySource.getTask(); // onCreate の中で: new Handler().postDelayed(new Runnable() { @Override public void run() { delaySource.setResult(null); } }, 2000);
private Task<Void> allTask; // onCreate() の中で: allTask = Tasks.whenAll(fetchTask, dbTask, delayTask); allTask.addOnSuccessListener(new OnSuccessListener<Void>() { @Override public void onSuccess(Void aVoid) { DataSnapshot data = dbTask.getResult(); // DB のデータに対する処理 startActivity(new Intent(SplashScreenActivity.this, MainActivity.class)); } }); allTask.addOnFailureListener(new OnFailureListener() { @Override public void onFailure(@NonNull Exception e) { // ユーザーに十分謝る！ } });
static <TResult> TResult await(Task<TResult> task) static <TResult> TResult await(Task<TResult> task, long timeout, TimeUnit unit)
