Created
May 15, 2018 19:58
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firebaseクラスっぽいやつ
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package sample.hoge; | |
import java.io.FileInputStream; | |
import com.google.firebase.FirebaseApp; | |
import com.google.firebase.FirebaseOptions; | |
public class FirebaseCommunicator { | |
FirebaseApp app; | |
public void initialize(String jsonFileName, String url, String identifier) throws Exception { | |
FileInputStream serviceAccount = new FileInputStream(jsonFileName); | |
FirebaseOptions options = new FirebaseOptions.Builder().setServiceAccount(serviceAccount).setDatabaseUrl(url) | |
.build(); | |
FirebaseApp.initializeApp(options, identifier); | |
app = FirebaseApp.getInstance(identifier); | |
// System.out.println(app); | |
} | |
public FirebaseApp getApp() { | |
return app; | |
} | |
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
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package sample.hoge; | |
import java.io.FileInputStream; | |
import com.google.firebase.FirebaseApp; | |
import com.google.firebase.FirebaseOptions; | |
import com.google.firebase.database.ChildEventListener; | |
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; | |
public class App { | |
static String JSON_FILE_NAME = "???.json"; | |
static String URL = "h???"; | |
public static void main(String[] args) throws Exception { | |
FirebaseCommunicator sampleFc = new FirebaseCommunicator(); | |
sampleFc.initialize(JSON_FILE_NAME, URL, "sample"); | |
DatabaseReference reference = FirebaseDatabase.getInstance(sampleFc.getApp()).getReference("folder"); | |
System.out.println(reference.getKey()); | |
reference.limitToLast(1).addChildEventListener(new ChildEventListener() { | |
public void onChildAdded(DataSnapshot dataSnapshot, String prevChildKey) { | |
Object key = dataSnapshot.getKey(); | |
Object value = dataSnapshot.getValue(); | |
System.out.println("child event : " + key + " , " + value + " and " + prevChildKey); | |
} | |
public void onCancelled(DatabaseError arg0) { | |
} | |
public void onChildChanged(DataSnapshot arg0, String arg1) { | |
} | |
public void onChildMoved(DataSnapshot arg0, String arg1) { | |
} | |
public void onChildRemoved(DataSnapshot arg0) { | |
} | |
}); | |
reference.limitToLast(1).addValueEventListener(new ValueEventListener() { | |
public void onDataChange(DataSnapshot dataSnapshot) { | |
Object obj = dataSnapshot.getValue(); | |
System.out.println("value event : " + obj); | |
} | |
public void onCancelled(DatabaseError databaseError) { | |
System.out.println("The read failed: " + databaseError.getCode()); | |
} | |
}); | |
int counter = 0; | |
while (true) { | |
counter++; | |
System.out.println("実行中です。"); | |
Thread.sleep(5000); | |
if(counter % 3 == 2) { | |
reference.push().setValue("クロウカード" + counter); | |
} | |
} | |
} | |
} |
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