我正在使用它来实现一个安全功能,如果我的应用程序从其他应用程序返回后重新获得焦点,则会显示锁定屏幕.
现在,问题是安全功能有时会显示两次.在挖掘了一下后,我注意到ActivityManager.getRunningTasks(1)中的topActivity有时仍然是您刚刚返回的活动.
就我而言,令人讨厌的挥之不去的应用程序是com.android.mms和com.google.android.apps.maps.
我在应用程序中也有一个呼叫设施,但它没有行为不端.
我对这种行为感到困惑.
解决方法
这对
Android来说确实是个问题.尝试下面对我有用的：
为您的活动准备基础课程.在里面：
@Override
protected void onPause() {
Utils.wentInBackground(this);
super.onPause();
}
@Override
protected void onResume() {
Utils.wentInForeground(this);
super.onResume();
}
然后在静态实用程序类中有这样的：
public static void wentInBackground(final Activity which) {
inBackground = true;
lastPaused = which.getClass().getSimpleName();
final PowerManager powerManager = (PowerManager) which.getSystemService(POWER_SERVICE);
final boolean isScreenOn = powerManager.isScreenOn();
if (isApplicationSentToBackground(which) || !isScreenOn) {
// Do your security lockdown here.
}
}
public static boolean isApplicationSentToBackground(final Context context) {
ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
List<RunningTaskInfo> tasks = am.getRunningTasks(1);
if (!tasks.isEmpty()) {
ComponentName topActivity = tasks.get(0).topActivity;
if (!topActivity.getPackageName().equals(context.getPackageName())) {
return true;
}
}
return false;
}
public static void wentInForeground(final Activity which) {
inBackground = false;
final String activityName = which.getClass().getSimpleName();
if (lastPaused.equals(activityName) || !isLoggedIn()) {
if (isLoggedIn()) {
// Do your security lockdown here again,if necessary.
}
// Show your security screen or whatever you need to.
}
}
public static boolean isLoggedIn() {
return loggedIn;
}