本文参考这位哥们：https://juejin.im/post/5b87f409e51d4538b0640f58
首先写两个类文件ActivityLifecycleCallbacksAdapter、LifecycleHelper :
public class ActivityLifecycleCallbacksAdapter implements Application.ActivityLifecycleCallbacks {
@Override
public void onActivityCreated(Activity activity, Bundle bundle) {
}
@Override
public void onActivityStarted(Activity activity) {
}
@Override
public void onActivityResumed(Activity activity) {
}
@Override
public void onActivityPaused(Activity activity) {
}
@Override
public void onActivityStopped(Activity activity) {
}
@Override
public void onActivitySaveInstanceState(Activity activity, Bundle bundle) {
}
@Override
public void onActivityDestroyed(Activity activity) {
}
}
public class LifecycleHelper {
// 监听切换到前台
private int rusumeActivityCount = 0;
private static LifecycleHelper lifecycleHelper;
public static LifecycleHelper getInstance() {
if (lifecycleHelper == null) {
lifecycleHelper = new LifecycleHelper();
}
return lifecycleHelper;
}
public void register(Application application) {
if (application != null)
application.registerActivityLifecycleCallbacks(new ActivityLifecycleCallbacksAdapter() {
@Override
public void onActivityStarted(Activity activity) {
if (rusumeActivityCount++ == 0) {
// 执行切换到前台的逻辑
Lig.i("后台 --> 前台");
FloatWindowUtil.hideShow();
// ... 使用EventBus传递数据
}
}
@Override
public void onActivityStopped(Activity activity) {
if (--rusumeActivityCount == 0) {
// 执行切换到后台的逻辑
Lig.i("前台 --> 后台");
// ... 使用EventBus传递数据
}
}
});
}
}
在MyApplication.java中进行注册:
public class MyApplication extends Application {
@Override
public void onCreate() {super.onCreate();//前后台切换的监听
LifecycleHelper.getInstance().register(this);
}
}