Android 判斷應用是否開啓了通知權限

判斷是否開啓應用權限方法

NotificationManagerCompat.from(context).areNotificationsEnabled();

如果沒有開啓應用權限，引導用戶點擊開啓按鈕，然後跳轉到系統設置界面

private void goToSetting() {
    Intent intent = new Intent();
    if (Build.VERSION.SDK_INT >= 26) {// android 8.0引導
        intent.setAction("android.settings.APP_NOTIFICATION_SETTINGS");
        intent.putExtra("android.provider.extra.APP_PACKAGE", getPackageName());
    } else if (Build.VERSION.SDK_INT >= 21) { // android 5.0-7.0
        intent.setAction("android.settings.APP_NOTIFICATION_SETTINGS");
        intent.putExtra("app_package", getPackageName());
        intent.putExtra("app_uid", getApplicationInfo().uid);
    } else {//其它
        intent.setAction("android.settings.APPLICATION_DETAILS_SETTINGS");
        intent.setData(Uri.fromParts("package", getPackageName(), null));
    }
    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    startActivity(intent);
}