每当我的广播执行时,我想显示对前景活动的警报。
当前回答
为了向后兼容:
ComponentName cn;
ActivityManager am = (ActivityManager) getApplicationContext().getSystemService(Context.ACTIVITY_SERVICE);
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M) {
cn = am.getAppTasks().get(0).getTaskInfo().topActivity;
} else {
//noinspection deprecation
cn = am.getRunningTasks(1).get(0).topActivity;
}
其他回答
其他答案我都不喜欢。ActivityManager不是用来获取当前活动的。超级分类和依赖onDestroy也是脆弱的,不是最好的设计。
老实说,到目前为止,我所想到的最好的方法就是在我的应用程序中维护一个枚举,它在创建活动时得到设置。
另一个建议可能是尽量避免使用多个活动。这既可以使用片段,也可以在我喜欢的自定义视图中完成。
我在Kotlin中做了以下工作
Create Application Class Edit the Application Class as Follows class FTApplication: MultiDexApplication() { override fun attachBaseContext(base: Context?) { super.attachBaseContext(base) MultiDex.install(this) } init { instance = this } val mFTActivityLifecycleCallbacks = FTActivityLifecycleCallbacks() override fun onCreate() { super.onCreate() registerActivityLifecycleCallbacks(mFTActivityLifecycleCallbacks) } companion object { private var instance: FTApplication? = null fun currentActivity(): Activity? { return instance!!.mFTActivityLifecycleCallbacks.currentActivity } } } Create the ActivityLifecycleCallbacks class class FTActivityLifecycleCallbacks: Application.ActivityLifecycleCallbacks { var currentActivity: Activity? = null override fun onActivityPaused(activity: Activity?) { currentActivity = activity } override fun onActivityResumed(activity: Activity?) { currentActivity = activity } override fun onActivityStarted(activity: Activity?) { currentActivity = activity } override fun onActivityDestroyed(activity: Activity?) { } override fun onActivitySaveInstanceState(activity: Activity?, outState: Bundle?) { } override fun onActivityStopped(activity: Activity?) { } override fun onActivityCreated(activity: Activity?, savedInstanceState: Bundle?) { currentActivity = activity } } you can now use it in any class by calling the following: FTApplication.currentActivity()
waqas716的答案很好。我针对需要更少代码和维护的特定情况创建了一个变通方案。
我通过一个静态方法从我怀疑是在前景的活动中获取一个视图,找到了一个特定的工作。 您可以遍历所有活动并检查您是否希望或从martin的回答中获得活动名称
ActivityManager am = (ActivityManager)context.getSystemService(Context.ACTIVITY_SERVICE);
ComponentName cn = am.getRunningTasks(1).get(0).topActivity;
然后我检查视图是否为空,并通过getContext()获取上下文。
View v = SuspectedActivity.get_view();
if(v != null)
{
// an example for using this context for something not
// permissible in global application context.
v.getContext().startActivity(new Intent("rubberduck.com.activities.SomeOtherActivity"));
}
您可以使用这个类进行灵活的生命周期处理
用法:
//Initialization
val lifeCycleHandler = ActivityLifeCycleHandler<Activity>()
//Detect only a specific type of activities
val lifeCycleHandler = ActivityLifeCycleHandler<MainActivity>()
//Get current activity
val instance = lifeCycleHandler.currentReference
//Get current activity state
val state = lifeCycleHandler.currentState
//Use listeners
lifeCycleHandler.addStateChangeListener { newState ->
//TODO: handle new state
}
lifeCycleHandler.addSpecificStateChangeListener(ActivityLifeCycleHandler.ActivityState.STARTED) {
//TODO: handle new state
}
//Removable listeners
val listener = { newState: Int ->
}
lifeCycleHandler.addStateChangeListener(listener)
lifeCycleHandler.removeStateChageListener(listener)
//Start listening
App.app.registerActivityLifecycleCallbacks(lifeCycleHandler)
//Stop listening
lifeCycleHandler.releaseListeners()
App.app.unregisterActivityLifecycleCallbacks(lifeCycleHandler)
在你的应用程序中创建一个类名ActivityManager (java)
public class ActivityManager implements Application.ActivityLifecycleCallbacks {
private Activity activity;
public ActivityManager(App myApplication) {
myApplication.registerActivityLifecycleCallbacks(this);
}
public Activity getActivity(){
return activity;
}
@Override
public void onActivityCreated(@NonNull Activity activity, @Nullable Bundle bundle) {
this. activity = activity;
}
@Override
public void onActivityStarted(@NonNull Activity activity) {
this. activity = activity;
}
@Override
public void onActivityResumed(@NonNull Activity activity) {
this. activity = activity;
}
@Override
public void onActivityPaused(@NonNull Activity activity) {
}
@Override
public void onActivityStopped(@NonNull Activity activity) {
}
@Override
public void onActivitySaveInstanceState(@NonNull Activity activity, @NonNull Bundle bundle) {
}
@Override
public void onActivityDestroyed(@NonNull Activity activity) {
}
}
然后在应用程序(kotlin)中初始化它
class App : Application() {
override fun onCreate() {
appOpenManager = AppOpenManager(this);
}
companion object {
lateinit var appOpenManager: AppOpenManager
}
}
然后用like
App.activityManager.getActivity ()
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