很多书里面都说 Context 对象个数 = 四大组件个数 + 1，这个1代表的是application，但其实这里的个数说法是不对的。

context 个数应该是 四大组件个数 + 进程数。

有几个进程，application就会被创建几次

Application

public class Application extends android.app.Application {

    @Override
    protected void attachBaseContext(Context base) {
        super.attachBaseContext(base);
        Log.i("DaqServices_TAG", "attachBaseContext: ");
    }

    @Override
    public void onCreate() {
        super.onCreate();
        Log.i("DaqServices_TAG", "oncreat");
    }
}

Service

public class DaqServices extends Service {
    private final String TAG = "DaqServices_TAG";


    @Override
    public void onCreate() {
        super.onCreate();
        Log.i(TAG, "onCreate() executed");
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.i(TAG, "onStartCommand() executed");
        return START_NOT_STICKY;
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        Log.i(TAG, "onDestroy() executed");
    }

    @Override
    public void onTaskRemoved(Intent intent) {
        super.onTaskRemoved(intent);
        Log.i(TAG, "onTaskremoved");

    }

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

AndroidManifest 配置

 <service
            android:name="com.pxworks.projectx.service.DaqServices"
            android:process=":peppelu"
            android:stopWithTask="false" />

日志

10-27 17:05:53.614 32026-32026/com.pxworks.projectx I/DaqServices_TAG: attachBaseContext: 
10-27 17:05:53.617 32026-32026/com.pxworks.projectx I/DaqServices_TAG: oncreat
10-27 17:05:53.839 32044-32044/com.pxworks.projectx:peppelu I/DaqServices_TAG: attachBaseContext: 
10-27 17:05:53.840 32044-32044/com.pxworks.projectx:peppelu I/DaqServices_TAG: oncreat
10-27 17:05:53.841 32044-32044/com.pxworks.projectx:peppelu I/DaqServices_TAG: onCreate() executed
10-27 17:05:53.841 32044-32044/com.pxworks.projectx:peppelu I/DaqServices_TAG: onStartCommand() executed

Application被创建了两次