Android点击通知打开指定Activity：后台关闭时跳转异常

问题核心：当应用处于后台或完全关闭状态时，Firebase的纯通知消息会由系统托盘直接处理，默认启动应用的启动Activity（即你的MainActivity），而非你在PushNotificationService中指定的BildirimGonder。要实现统一跳转，需要同时处理前台自定义通知和后台启动Activity的跳转逻辑。

解决方案步骤 #

1. 修改通知Intent的配置 #

在PushNotificationService的durumaBagli方法中，给跳转Intent添加标记参数和启动栈控制，确保参数能传递且栈行为符合预期：

private void durumaBagli(String baslik, String icerik) {
    NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
    
    // 1. 创建跳转Intent并添加标记参数
    Intent intent = new Intent(this, BildirimGonder.class);
    intent.putExtra("FROM_NOTIFICATION", true); // 标记这是从通知跳转的请求
    // 控制Activity栈：清除上方栈顶，避免重复创建实例
    intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);

    PendingIntent pendingIntent = PendingIntent
            .getActivity(this, 1, intent,
                    PendingIntent.FLAG_UPDATE_CURRENT | PendingIntent.FLAG_IMMUTABLE);

    // 原有通知构建代码不变...
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){
        String kanalid = "kanalId";
        String kanalAd = "kanalAd";
        String kanalTanim = "kanalTanim";

        int kanalOnceligi = NotificationManager.IMPORTANCE_HIGH;

        NotificationChannel kanal = notificationManager.getNotificationChannel(kanalid);

        if (kanal == null){
            kanal = new NotificationChannel(kanalid,kanalAd,kanalOnceligi);
            kanal.setDescription(kanalTanim);
            notificationManager.createNotificationChannel(kanal);
        }

        builder = new NotificationCompat.Builder(this,kanalid);
        builder.setContentTitle(baslik);
        builder.setContentText(icerik);
        builder.setSmallIcon(R.drawable.gurpinarlogom);
        builder.setAutoCancel(true);
        builder.setContentIntent(pendingIntent);
    }else {
        builder = new NotificationCompat.Builder(getApplicationContext());
        builder.setContentTitle(baslik);
        builder.setContentText(icerik);
        builder.setSmallIcon(R.drawable.gurpinarlogom);
        builder.setAutoCancel(true);
        builder.setContentIntent(pendingIntent);
        builder.setPriority(Notification.PRIORITY_HIGH);
    }

    notificationManager.notify(1,builder.build());
}

2. 在启动Activity（MainActivity）中处理跳转逻辑 #

当应用关闭后点击通知，系统会先启动MainActivity，此时需要在MainActivity中检查Intent参数，自动跳转到目标页面：

public class MainActivity extends AppCompatActivity {

    private BottomNavigationView bottomNav;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
                     
        bottomNav = findViewById(R.id.bottomNav);
        NavHostFragment navHostFragment = (NavHostFragment) getSupportFragmentManager()
                .findFragmentById(R.id.nav_host_fragment);
        NavigationUI.setupWithNavController(bottomNav, navHostFragment.getNavController());
        getSupportActionBar().setBackgroundDrawable(new ColorDrawable(Color.parseColor("#01A2D6")));
        
        // 处理通知跳转逻辑
        handleNotificationIntent(getIntent());
    }

    // 处理Activity复用的情况（比如应用在后台时点击通知）
    @Override
    protected void onNewIntent(Intent intent) {
        super.onNewIntent(intent);
        setIntent(intent);
        handleNotificationIntent(intent);
    }

    private void handleNotificationIntent(Intent intent) {
        if (intent != null && intent.getBooleanExtra("FROM_NOTIFICATION", false)) {
            // 跳转到目标Activity
            Intent targetIntent = new Intent(this, BildirimGonder.class);
            targetIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
            startActivity(targetIntent);
            // 可选：如果不需要保留MainActivity在栈中，调用finish()
            // finish();
        }
    }

    public void setActionBarTitle(String title) {
        getSupportActionBar().setTitle(title);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.toolbar_menu, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(@NonNull MenuItem item) {
        switch (item.getItemId()) {
            case R.id.action_iletisim:
                Intent mesajGonder = new Intent(getApplicationContext(), MesajGonder.class);
                startActivity(mesajGonder);
                Toast.makeText(this, "İletişim sayfası", Toast.LENGTH_SHORT).show();
                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }
}

3. 确保推送消息包含数据字段（可选但推荐） #

如果你的推送是纯通知消息（仅包含notification字段），后台状态下系统会直接处理，不会走到onMessageReceived。为了覆盖所有场景，建议推送时同时包含data字段，这样即使后台也能触发onMessageReceived处理：

示例推送JSON：

{
  "notification": {
    "title": "推送标题",
    "body": "推送内容"
  },
  "data": {
    "target_activity": "BildirimGonder"
  },
  "to": "设备FCM令牌"
}

然后在onMessageReceived中读取data字段，动态指定跳转目标：

@Override
public void onMessageReceived(@NonNull RemoteMessage message) {
    String baslik = message.getNotification().getTitle();
    String icerik = message.getNotification().getBody();
    // 读取自定义数据
    String targetActivity = message.getData().get("target_activity");
    durumaBagli(baslik, icerik, targetActivity);
}

// 修改durumaBagli方法，接收目标Activity参数
private void durumaBagli(String baslik, String icerik, String targetActivity) {
    NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
    
    Intent intent;
    // 根据data字段动态创建Intent
    if ("BildirimGonder".equals(targetActivity)) {
        intent = new Intent(this, BildirimGonder.class);
    } else {
        intent = new Intent(this, MainActivity.class);
    }
    intent.putExtra("FROM_NOTIFICATION", true);
    intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);

    // 后续通知构建代码不变...
}

关键原理说明 #

• 前台状态：通知由PushNotificationService构建，PendingIntent直接指向目标Activity，点击后正常跳转。
• 后台/关闭状态：系统先启动启动Activity（MainActivity），通过检查Intent中的FROM_NOTIFICATION标记，自动触发跳转到目标页面。

内容的提问来源于stack exchange，提问作者Revenge