[英]How to check app is running in background of foreground in BroadcastReceiver
[英]Check if app is running in foreground or background (with sync adapter)
我知道這是一個重復的問題,但我已經找遍了所有地方,找不到適合我的解決方案,所以......
我有一個從 TMDB API 獲取電影數據的應用程序,它使用同步適配器按頁面獲取它,基本上它運行良好,除非在應用程序打開並且用戶不在第一頁時運行同步適配器的定期同步,所以我的選擇是強制更新電影列表並將用戶發送到列表的頂部,這是完全糟糕的體驗,因此不被視為一個選項,或者我可以檢查應用程序是否正在運行,無論是在前台還是在應用程序中堆棧,它對用戶不可見但仍在運行,所以我可以通過搜索得到的最好的代碼是這段代碼:
public static boolean isAppRunning(final Context context, final String packageName) {
final ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
final List<ActivityManager.RunningAppProcessInfo> procInfos = activityManager.getRunningAppProcesses();
if (procInfos != null) {
for (final ActivityManager.RunningAppProcessInfo processInfo : procInfos) {
if (processInfo.processName.equals(packageName))
return true;
}
}
return false;
}
但無論出於何種原因,它都無法正常工作,並且即使我通過滑動殺死了它,它也會看到該應用程序正在運行,起初我認為這是因為我有一個同步適配器,它可以被視為正在運行的應用程序,所以我使用了另一個進程它在清單中使用
android:process=":service"
但它沒有用
還考慮在活動的 onStart 和 onStop 中使用變量,但不能保證在關閉或終止應用程序時會調用 onStop,因此盡量避免使用此方法
這是我的 manifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="inc.mourad.ahmed.watchme">
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.AUTHENTICATE_ACCOUNTS" />
<uses-permission android:name="android.permission.READ_SYNC_SETTINGS" />
<uses-permission android:name="android.permission.WRITE_SYNC_SETTINGS" />
<permission
android:name="inc.ahmed.mourad.ACCESS_WATCHME_DATABASE"
android:label="access my movies content provider"
android:protectionLevel="dangerous" />
<permission
android:name="inc.ahmed.mourad.ACCESS_WATCHME_SYNC_SERVICE"
android:label="access my sync service"
android:protectionLevel="dangerous" />
<permission
android:name="inc.ahmed.mourad.ACCESS_WATCHME_SYNC_AUTHENTICATOR_SERVICE"
android:label="access my sync authenticator dummy service"
android:protectionLevel="dangerous" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/Theme.AppCompat">
<activity android:name=".SplashScreenActivity"
android:theme="@style/Theme.AppCompat.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".MainActivity"
android:label="@string/app_name"
android:theme="@style/Theme.AppCompat">
<intent-filter>
<data
android:host="www.ahmedmourad.com"
android:pathPrefix="/watchme/"
android:scheme="http" />
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.DEFAULT"/>
<category android:name="android.intent.category.BROWSABLE"/>
</intent-filter>
</activity>
<activity
android:name=".SettingsActivity"
android:label="@string/title_activity_settings"
android:parentActivityName=".MainActivity">
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="inc.mourad.ahmed.watchme.MainActivity" />
</activity>
<activity android:name=".MovieDetailsActivity" />
<provider
android:name=".data.MovieProvider"
android:authorities="@string/content_authority"
android:enabled="true"
android:exported="false"
android:permission="inc.ahmed.mourad.ACCESS_WATCHME_DATABASE"
android:syncable="true" />
<!-- SyncAdapter's dummy authentication service -->
<service android:name=".sync.WatchMeAuthenticatorService"
android:permission="inc.ahmed.mourad.ACCESS_WATCHME_SYNC_AUTHENTICATOR_SERVICE"
android:process=":service">
<intent-filter>
<action android:name="android.accounts.AccountAuthenticator" />
</intent-filter>
<meta-data
android:name="android.accounts.AccountAuthenticator"
android:resource="@xml/authenticator" />
</service>
<!-- The SyncAdapter service -->
<service
android:name=".sync.WatchMeSyncService"
android:exported="true"
android:permission="inc.ahmed.mourad.ACCESS_WATCHME_SYNC_SERVICE"
android:process=":service">
<intent-filter>
<action android:name="android.content.SyncAdapter" />
</intent-filter>
<meta-data
android:name="android.content.SyncAdapter"
android:resource="@xml/syncadapter" />
</service>
</application>
那么,有什么想法嗎? 提前致謝
我們調整了你的想法並提出了這個(在 Kotlin 中,Java 見下文):
fun appInForeground(context: Context): Boolean {
val activityManager = context.getSystemService(Context.ACTIVITY_SERVICE) as ActivityManager
val runningAppProcesses = activityManager.runningAppProcesses ?: return false
return runningAppProcesses.any { it.processName == context.packageName && it.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND }
}
這在 Java 中是等價的:
private boolean appInForeground(@NonNull Context context) {
ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
List<ActivityManager.RunningAppProcessInfo> runningAppProcesses = activityManager.getRunningAppProcesses();
if (runningAppProcesses == null) {
return false;
}
for (ActivityManager.RunningAppProcessInfo runningAppProcess : runningAppProcesses) {
if (runningAppProcess.processName.equals(context.getPackageName()) &&
runningAppProcess.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND) {
return true;
}
}
return false;
}
原始答案: https : //stackoverflow.com/a/48767617/10004454根據 Android 文檔推薦的方法是
class MyApplication : Application(), LifecycleObserver {
override fun onCreate() {
super.onCreate()
ProcessLifecycleOwner.get().lifecycle.addObserver(this)
}
fun isInForeground(): Boolean {
return ProcessLifecycleOwner.get().lifecycle.currentState.isAtLeast(Lifecycle.State.STARTED)
}
@OnLifecycleEvent(Lifecycle.Event.ON_STOP)
fun onAppBackgrounded() {
//App in background
Log.e(TAG, "************* backgrounded")
Log.e(TAG, "************* ${isInForeground()}")
}
@OnLifecycleEvent(Lifecycle.Event.ON_START)
fun onAppForegrounded() {
Log.e(TAG, "************* foregrounded")
Log.e(TAG, "************* ${isInForeground()}")
// App in foreground
}}
在您的 gradle(應用程序)中添加: implementation "androidx.lifecycle:lifecycle-extensions:2.2.0"
然后在運行時調用(applicationContext as MyApplication).isActivityVisible()
檢查狀態(applicationContext as MyApplication).isActivityVisible()
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