Question

enter code here尝试启动该服务，但在第一次启动应用期间服务运行正常时，启动服务并未启动。

这是接收器，我想使用开关盒，因为我必须开始使用接收器。

 @Override
    public void onReceive(Context context, Intent intent) {
        Intent serviceIntent;
 switch (intent.getAction()) {
            case SmackService.NEW_MESSAGE:
                Log.i("TAG", "processMessage() BroadCast Recieve");
                break;
            case Intent.ACTION_BOOT_COMPLETED:
                Log.i("TAG", "Boot");
                Toast.makeText(context, "case", Toast.LENGTH_SHORT).show();
                    serviceIntent = new Intent(context, SmackService.class);
                    context.startService(serviceIntent);
                break;
}
}

清单内容： -

<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<receiver android:name="com.example.abhishek.im.ChatReceiver">
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED" />
                <action android:name="com.tlt.rx.msg" />
            </intent-filter>
        </receiver>

服务类

public class SmackService extends Service {
  @Override
    public void onCreate() {
        super.onCreate();
    }

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        user_data = new HashMap<>();
        if (intent != null && intent.hasExtra(BUNDLE_MSG_SYNC)) {
            doChatSync = intent.getBooleanExtra(BUNDLE_MSG_SYNC, false);
        }
        if (intent != null) {
            String email, password, name;
            email = intent.getExtras().getString("email");
            password = intent.getExtras().getString("password");
            name = intent.getExtras().getString("name");
            activity=intent.getExtras().getString("activity");
            user_data.put("email", email);
            user_data.put("password", password);
            user_data.put("name", name);
            start(user_data);
        }
        return Service.START_STICKY;
    }
}

手动启动服务：

Toast.makeText(MainActivity.this, "Signing in", Toast.LENGTH_LONG).show();
                    Intent intent = new Intent(MainActivity.this, SmackService.class);
                    intent.putExtra("email", email);
                    intent.putExtra("password", password);
                    intent.putExtra("name", name);
                    intent.putExtra("activity", "MainActivity");
                    startService(intent);

NT）;

Answer 1

非常清楚发生了什么。在启动时，您的BroadcastReceiver正在被调用。然后它会像这样开始Service：

serviceIntent = new Intent(context, SmackService.class);
context.startService(serviceIntent);

在onStartCommand()中执行此操作：

email = intent.getExtras().getString("email");

由于Intent中没有“额外内容”，getExtras()会返回null而您在getString()引用上调用null，然后引发NullPointerException Service，导致#include<iostream> using namespace std; class Man { int stories; public: Man(int stories) : stories(stories) {cout << "A man is created with " << stories << " stories." << endl;}; }; class Grandpa : public virtual Man { int pipes; public: Grandpa(int stories, int pipes) : Man(1000), pipes(pipes) { stories += stories; cout << "Grandpa is created with " << stories << " stories and pipes." << endl; }; }; class Father : public Grandpa { int cars; public: Father(int stories, int cars) : Man(1000), Grandpa(1000, 1), cars(cars) { stories += stories; cout << "Father is created with " << stories << " stories and cars." << endl; }; }; class Son : public Father { int girls; public: Son(int stories, int girls) : Man(1000), Father(1000, 3), girls(girls) { stories += stories; cout << "Son is created with " << stories << " stories and girls." << endl; }; }; int main() { Son Dick(1000, 5); return 0; }崩溃。

故事结束。

启动时未启动服务

1 个答案: