我正在使用Firebase制作多人游戏。在下面的FindOpponentActivity中。该应用程序检查大厅是否已经存在，如果不存在，则创建一个大厅。如果已经存在，则玩家进入大厅，并且两个玩家都进入GameActivity，然后游戏开始。现在，创建大厅的玩家（如果愿意的话）是主机，这个问题是当GameActivity启动时，它会在自身之上多次启动。另外，每当单击一个按钮时（即调用onDataChange），主机就会打开另一个GameActivty。播放器2不这样做。我在做什么错了？
这是我的FindOpponentActivity：
package com.example.android.pitjesbak;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
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 FindOpponentActivity extends AppCompatActivity {
private FirebaseDatabase db;
private DatabaseReference lobbies;
private DatabaseReference users;
private DatabaseReference lobby;
private String lobbyKey;
FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
TextView status, findingOpponent;
TextView cancel;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_findopponent);
db = FirebaseDatabase.getInstance();
lobbies = db.getReference("lobbies");
users = db.getReference("users");
final Handler handler = new Handler();
final Runnable findOpponent = new Runnable() {
public void run() {
OpponentExists();
}
};
handler.postDelayed(findOpponent, 5000);
cancel = findViewById(R.id.cancel);
cancel.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
lobbies.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
if(dataSnapshot.child(user.getUid()).exists()){
lobbies.child(user.getUid()).removeValue();
}else{
handler.removeCallbacks(findOpponent);
}
Intent intent = new Intent(getApplicationContext(), MainActivity.class);
startActivity(intent);
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
});
}
public void OpponentExists(){
lobbies.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
if(dataSnapshot.exists()){
joinOpponent();
}else{
createLobby();
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
};
public void joinOpponent(){
lobbies.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
for(DataSnapshot child: dataSnapshot.getChildren()){
if(!child.child("player2").exists()){
lobbyKey = child.getKey();
break;
}
}
if(lobbyKey == null){
createLobby();
}else{
lobbies.child(lobbyKey).child("player2").setValue(user.getEmail());
Intent startGame = new Intent(getApplicationContext(), GameActivity.class);
startGame.putExtra("lobbyKey", lobbyKey);
startGame.putExtra("player", 2);
startActivity(startGame);
FindOpponentActivity.this.finish();
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
public void createLobby(){
lobbies.child(user.getUid()).child("dice1").setValue(0);
lobbies.child(user.getUid()).child("dice2").setValue(0);
lobbies.child(user.getUid()).child("dice3").setValue(0);
lobbies.child(user.getUid()).child("lives_p1").setValue(7);
lobbies.child(user.getUid()).child("lives_p2").setValue(7);
lobbies.child(user.getUid()).child("turn").setValue(1);
lobbies.child(user.getUid()).child("has_stoeft").setValue(0);
lobbies.child(user.getUid()).child("total_score_p1").setValue(0);
lobbies.child(user.getUid()).child("total_score_p2").setValue(0);
lobbies.child(user.getUid()).child("current_score_p1").setValue("0 points");
lobbies.child(user.getUid()).child("current_score_p2").setValue("0 points");
lobbies.child(user.getUid()).child("rolls_left").setValue(3);
lobbies.child(user.getUid()).child("player1").setValue(user.getEmail());
lobbyKey = user.getUid();
lobby = lobbies.child(lobbyKey);
lobby.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
if(dataSnapshot.child("player2").exists()){
Intent startGame = new Intent(getApplicationContext(), GameActivity.class);
startGame.putExtra("lobbyKey", lobbyKey);
startGame.putExtra("player", 1);
startActivity(startGame);
FindOpponentActivity.this.finish();
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
};
}
这是我的GameActivity：
package com.example.android.pitjesbak;
import android.content.Intent;
import android.os.Bundle;
import android.os.PersistableBundle;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.LinearLayout;
import android.widget.PopupWindow;
import android.widget.TextView;
import android.widget.Toast;
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;
import java.util.Random;
import static android.view.View.INVISIBLE;
import static android.view.View.VISIBLE;
public class GameActivity extends AppCompatActivity {
Button roll, stop;
TextView dice1, dice2, dice3, stoefen, player, other, current_score_player, current_score_other, lives_player, lives_other;
CheckBox[] checks = new CheckBox[3];
private int[] dice = new int[3];
int min = 1;
int max = 6;
private int[] dice_scores = new int[3];
String dice_total;
boolean sn_4, sn_5, sn_6;
boolean has_stoeft = false;
int rolls_left;
int turn = 1;
int playing;
String popup;
String lobbyKey;
FirebaseDatabase db;
DatabaseReference lobby;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_game);
lobbyKey= getIntent().getStringExtra("lobbyKey");
db = FirebaseDatabase.getInstance();
lobby = db.getReference("lobbies").child(lobbyKey);
roll = findViewById(R.id.roll);
stop = findViewById((R.id.stop));
roll.setEnabled(false);
stoefen = findViewById(R.id.stoefen);
stoefen.setVisibility(INVISIBLE);
roll.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
roll();
}
});
stop.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
stop();
}
});
dice1 = findViewById(R.id.dice1);
dice2 = findViewById(R.id.dice2);
dice3 = findViewById(R.id.dice3);
checks[0] = (CheckBox) findViewById(R.id.check1);
checks[1] = (CheckBox) findViewById(R.id.check2);
checks[2] = (CheckBox) findViewById(R.id.check3);
player = findViewById(R.id.player);
current_score_player = findViewById(R.id.current_score_player);
lives_player = findViewById(R.id.lives_player);
other = findViewById(R.id.other);
current_score_other = findViewById(R.id.current_score_other);
lives_other = findViewById(R.id.lives_other);
lobby.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull final DataSnapshot dataSnapshot) {
int playerCheck = getIntent().getIntExtra("player", 1);
if(playerCheck == 1) {
player.setText(dataSnapshot.child("player1").getValue(String.class));
current_score_player.setText(dataSnapshot.child("current_score_p1").getValue(String.class));
lives_player.setText(dataSnapshot.child("lives_p1").getValue(Long.class).toString());
other.setText(dataSnapshot.child("player2").getValue(String.class));
current_score_other.setText(dataSnapshot.child("current_score_p2").getValue(String.class));
lives_other.setText(dataSnapshot.child("lives_p2").getValue(Long.class).toString());
}else{
player.setText(dataSnapshot.child("player2").getValue(String.class));
current_score_player.setText(dataSnapshot.child("current_score_p2").getValue(String.class));
lives_player.setText(dataSnapshot.child("lives_p2").getValue(Long.class).toString());
other.setText(dataSnapshot.child("player1").getValue(String.class));
current_score_other.setText(dataSnapshot.child("current_score_p1").getValue(String.class));
lives_other.setText(dataSnapshot.child("lives_p1").getValue(Long.class).toString());
}
turn = dataSnapshot.child("turn").getValue(int.class);
if(turn%2 == 0){
playing = 2;
}else{
playing = 1;
}
if(playing == playerCheck){
roll.setEnabled(true);
}else{
roll.setEnabled(false);
stop.setEnabled(false);
}
dice1.setText(dataSnapshot.child("dice1").getValue(Long.class).toString());
dice2.setText(dataSnapshot.child("dice2").getValue(Long.class).toString());
dice3.setText(dataSnapshot.child("dice3").getValue(Long.class).toString());
rolls_left = dataSnapshot.child("rolls_left").getValue(int.class);
if(rolls_left == 3){
for (int i = 0; i < 3; i++) {
checks[i].setEnabled(false);
}
stop.setEnabled(false);
}
if (rolls_left < 3) {
if (rolls_left == 2) {
stoefen.setVisibility(VISIBLE);
} else {
stoefen.setVisibility(INVISIBLE);
}
if(rolls_left == 0){
roll.setEnabled(false);
}
stop.setEnabled(true);
for (int i = 0; i < 3; i++) {
checks[i].setEnabled(true);
}
}
if(dataSnapshot.child("round_winner").exists()) {
if (dataSnapshot.child("winner").exists()) {
Intent intent = new Intent(getApplicationContext(), FinishActivity.class);
intent.putExtra("lobbyKey", lobbyKey);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
GameActivity.this.finish();
} else {
lobby.child("current_score_p1").setValue("0 points");
lobby.child("current_score_p2").setValue("0 points");
lobby.child("round_winner").removeValue();
lobby.child("has_stoeft").setValue(false);
lobby.child("rolls_left").setValue(3);
lobby.child("turn").setValue(1);
lobby.child("readyup").removeValue();
Intent intent = new Intent(getApplicationContext(), GameActivity.class);
intent.putExtra("player", playerCheck);
intent.putExtra("lobbyKey", lobbyKey);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
GameActivity.this.finish();
}
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
public void roll(){
if (rolls_left > 0) {
Toast.makeText(GameActivity.this, rolls_left + " rolls left", Toast.LENGTH_SHORT).show();
} else if (rolls_left == 0) {
Toast.makeText(GameActivity.this, "no rolls left", Toast.LENGTH_SHORT).show();
roll.setEnabled(false);
}
sn_4 = false;
sn_5 = false;
sn_6 = false;
// generate numbers
for (int i = 0; i < 3; i++) {
if (checks[i].isChecked() == false) {
Random r = new Random();
int random = r.nextInt(((max - min) + 1)) + min;
dice[i] = random;
}else{
if(i == 0){
dice[0] = Integer.parseInt(dice1.getText().toString());
}else if(i == 1){
dice[1] = Integer.parseInt(dice2.getText().toString());
}else if(i == 2){
dice[2] = Integer.parseInt(dice3.getText().toString());
}
}
}
lobby.child("dice1").setValue(dice[0]);
lobby.child("dice2").setValue(dice[1]);
lobby.child("dice3").setValue(dice[2]);
// Set scores
for (int i = 0; i < 3; i++) {
if (dice[i] == 4) {
sn_4 = true;
}
if (dice[i] == 5) {
sn_5 = true;
}
if (dice[i] == 6) {
sn_6 = true;
}
}
if (dice[0] == dice[1] && dice[1] == dice[2]) {
if (dice[0] == 1) {
dice_total = "3 azen";
} else {
dice_total = "zand";
}
} else if (sn_4 == true && sn_5 == true && sn_6 == true) {
dice_total = "soixante-neuf";
} else {
for (int i = 0; i < 3; i++) {
if (dice[i] == 1) {
dice_scores[i] = 100;
} else if (dice[i] == 6) {
dice_scores[i] = 60;
} else {
dice_scores[i] = dice[i];
}
}
dice_total = (dice_scores[0] + dice_scores[1] + dice_scores[2]) + " points";
}
if(playing == 1){
lobby.child("current_score_p1").setValue(dice_total);
}else{
lobby.child("current_score_p2").setValue(dice_total);
}
if(rolls_left > 0){
rolls_left -= 1;
}else{
roll.setEnabled(false);
}
lobby.child("rolls_left").setValue(rolls_left);
};
public void stop(){
if(stoefen.getVisibility() == VISIBLE){
has_stoeft = true;
lobby.child("has_stoeft").setValue(true);
}
if(turn == 1){
lobby.child("turn").setValue(2);
lobby.child("rolls_left").setValue(3);
}else if(turn == 2){
int winner = 0;
int worth = 0;
switch (current_score_player.getText().toString()) {
case "3 azen":
if (current_score_other.getText().toString().equals("3 azen")) {
winner = 0;
worth = 0;
} else {
winner = 2;
worth = Integer.parseInt(lives_player.getText().toString());
}
break;
case "soixante-neuf":
if (current_score_other.getText().toString().equals("3 azen")) {
winner = 1;
worth = Integer.parseInt(lives_other.getText().toString());
} else if (current_score_other.getText().toString().equals("soixante-neuf")) {
winner = 0;
worth = 0;
} else {
winner = 2;
worth = 3;
}
break;
case "zand":
if (current_score_other.getText().toString().equals("3 azen") || current_score_other.getText().toString().equals("soixante-neuf")) {
winner = 1;
if(current_score_other.getText().toString().equals("3 azen")){
worth = Integer.parseInt(lives_other.getText().toString());
}else{
worth = 3;
}
} else if (current_score_other.getText().toString().equals("zand")) {
winner = 0;
worth = 0;
} else {
winner = 2;
worth = 2;
}
break;
default:
if (current_score_other.getText().toString().equals("3 azen") || current_score_other.getText().toString().equals("soixante-neuf") || current_score_other.getText().toString().equals("zand")) {
winner = 1;
if(current_score_other.getText().toString().equals("3 azen")){
worth = Integer.parseInt(lives_other.getText().toString());
}else if(current_score_other.getText().toString().equals("soixante-neuf")){
worth = 3;
}else if(current_score_other.getText().toString().equals("zand")){
worth = 2;
}
} else {
String[] p2_parts = current_score_player.getText().toString().split(" ");
int score_p2 = Integer.parseInt(p2_parts[0]);
String[] p1_parts = current_score_other.getText().toString().split(" ");
int score_p1 = Integer.parseInt(p1_parts[0]);
if (score_p1 > score_p2) {
winner = 1;
worth = 1;
} else if (score_p1 < score_p2) {
winner = 2;
worth = 1;
} else {
winner = 0;
worth = 0;
}
}
}
int lives_p1 = Integer.parseInt(lives_other.getText().toString());
int lives_p2 = Integer.parseInt(lives_player.getText().toString());
if( winner == 1){
lives_p1 -= worth;
if(has_stoeft){
lives_p1 --;
}
lobby.child("lives_p1").setValue(lives_p1);
}else if(winner == 2){
lives_p2 -= worth;
if(has_stoeft){
lives_p1 += 2;
}
lobby.child("lives_p2").setValue(lives_p2);
lobby.child("lives_p1").setValue(lives_p1);
}
if(lives_p1 <= 0){
lobby.child("winner").setValue(1);
}
if(lives_p2 <= 0){
lobby.child("winner").setValue(2);
}
lobby.child("round_winner").setValue(winner);
}
}
}
答案 0 :(得分：1)
您是否尝试过在收到事件之后或活动拆除（onStop / onDestroy）期间删除在FindOpponentsActivity中添加/附加的事件侦听器？我的猜测是它仍然会附着并接收事件。