自定义生命周期感知组件

每个 UI 组件生命周期都会更改，如图所示。 你可以创建组件，该组件将在生命周期状态更改时得到通知：

public class MyLocationListener implements LifecycleObserver {
    private boolean enabled = false;
    private Lifecycle lifecycle;
    public MyLocationListener(Context context, Lifecycle lifecycle, Callback callback) {
       ...
    }

    @OnLifecycleEvent(Lifecycle.Event.ON_START)
    void start() {
        if (enabled) {
           // connect
        }
    }

    public void enable() {
        enabled = true;
        if (lifecycle.getState().isAtLeast(STARTED)) {
            // connect if not connected
        }
    }

    @OnLifecycleEvent(Lifecycle.Event.ON_STOP)
    void stop() {
        // disconnect if connected
    }
}