Android判斷當前應用程序狀態是在前臺還是后臺
1
public static boolean isBackground(Context context) {
Log.d("Nat: isBackground.packageName1", context.getPackageName());
ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
List<ActivityManager.RunningAppProcessInfo> appProcesses = activityManager.getRunningAppProcesses();
for (ActivityManager.RunningAppProcessInfo appProcess : appProcesses) {
Log.d("Nat: isBackground.processName", appProcess.processName);
if (appProcess.processName.equals(context.getPackageName())) {
Log.d("Nat: isBackground.importance", String.valueOf(appProcess.importance));
if (appProcess.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_BACKGROUND) {
Log.i("后臺", appProcess.processName);
return true;
}else{
Log.i("前臺", appProcess.processName);
return false;
}
}
}
return false;
}
2
class ForegroundCheckTask extends AsyncTask<Context, Void, Boolean> {
@Override
protected Boolean doInBackground(Context... params) {
final Context context = params[0].getApplicationContext();
return isAppOnForeground(context);
}
private boolean isAppOnForeground(Context context) {
ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
List<ActivityManager.RunningAppProcessInfo> appProcesses = activityManager.getRunningAppProcesses();
if (appProcesses == null) {
return false;
}
final String packageName = context.getPackageName();
Log.d("Nat: isAppOnForeground.packageName", context.getPackageName());
for (ActivityManager.RunningAppProcessInfo appProcess : appProcesses) {
Log.d("Nat: isAppOnForeground.processName", appProcess.processName);
if (appProcess.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND && appProcess.processName.equals(packageName)) {
return true;
}
}
return false;
}
}
3
public static boolean isForeground(Context context) {
Log.d("Nat: isBackground.checkPackageName", context.getPackageName());
ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
List<ActivityManager.RunningTaskInfo> runningTasks = am.getRunningTasks(1);
if (runningTasks != null){
// The first in the list of RunningTasks is always the foreground task.
ActivityManager.RunningTaskInfo foregroundTaskInfo = runningTasks.get(0);
String foregroundTaskPackageName = foregroundTaskInfo .topActivity.getPackageName();
Log.d("Nat: isBackground.foregroundTaskPackageName", foregroundTaskPackageName);
if (context.getPackageName().equals(foregroundTaskPackageName)){
return true;
}
// PackageManager pm = context.getPackageManager();
// PackageInfo foregroundAppPackageInfo = pm.getPackageInfo(foregroundTaskPackageName, 0);
// String foregroundTaskAppName = foregroundAppPackageInfo.applicationInfo.loadLabel(pm).toString();
}
return false;
}
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