背景
应用内不指定subId获取数据状态可能会错误,因为可能拿到voice的能力,而非data。
代码逻辑
1、通过TelephonyManager的isDataEnabled()没有指定subId时,调用内部方法isDataEnabledForReason,传入getId()参数以指定subid,然后会执行到SubscriptionManager的getDefaultDataSubscriptionId()以获取默认值,
/**
* Returns whether mobile data is enabled or not per user setting. There are other factors
* that could disable mobile data, but they are not considered here.
*
* If this object has been created with {@link #createForSubscriptionId}, applies to the given
* subId. Otherwise, applies to {@link SubscriptionManager#getDefaultDataSubscriptionId()}
*
* <p>Requires one of the following permissions:
* {@link android.Manifest.permission#ACCESS_NETWORK_STATE},
* {@link android.Manifest.permission#MODIFY_PHONE_STATE}, or
* {@link android.Manifest.permission#READ_BASIC_PHONE_STATE
* READ_BASIC_PHONE_STATE} or that the calling app has carrier
* privileges (see {@link #hasCarrierPrivileges}).
*
* <p>Note that this does not take into account any data restrictions that may be present on the
* calling app. Such restrictions may be inspected with
* {@link ConnectivityManager#getRestrictBackgroundStatus}.
*
* @return true if mobile data is enabled.
*/
@RequiresPermission(anyOf = {android.Manifest.permission.ACCESS_NETWORK_STATE,
android.Manifest.permission.MODIFY_PHONE_STATE,
android.Manifest.permission.READ_PHONE_STATE,
android.Manifest.permission.READ_BASIC_PHONE_STATE})
@RequiresFeature(PackageManager.FEATURE_TELEPHONY_DATA)
public boolean isDataEnabled() {
try {
return isDataEnabledForReason(DATA_ENABLED_REASON_USER);
} catch (IllegalStateException ise) {
// TODO(b/176163590): Remove this catch once TelephonyManager is booting safely.
Log.e(TAG, "Error calling #isDataEnabled, returning default (false).", ise);
return false;
}
}
2、根据SubscriptionManager逻辑,会查询获取DefaultSubId的值,最终用的是SubscriptionController数据
/**
* Returns the system's default data subscription id.
*
* On a voice only device or on error, will return INVALID_SUBSCRIPTION_ID.
*
* @return the default data subscription Id.
*/
public static int getDefaultDataSubscriptionId() {
return sDefaultDataSubIdCache.query(null);
}
3、SubscriptionController的逻辑,未指定subid时拿到的会是voice的 能力
使用方法和说明
在Android中,TelephonyManager类的isDataEnabled()方法用于检查移动数据连接是否启用。而subId(Subscription ID)是用于标识不同SIM卡的唯一ID。
Note:isDataEnable()可不传入参数,即默认的subId(使用getDefaultDataSubscriptionId()方法获取),也可以指定subId(如下代码示例)。文章来源:https://www.toymoban.com/news/detail-606568.html
- 在多卡手机中,可以通过TelephonyManager的getSubId()方法获取当前活动的SIM卡的SubId,
- 然后可使用TelephonyManager.isDataEnabled()方法检查指定的subId对应的SIM卡的移动数据链接是否启用
代码示例:
文章来源地址https://www.toymoban.com/news/detail-606568.html
TelephonyManager mTelephonyManager = (TelephonyManager) getSystemService(context.TELEPHONY_SERVICE);
int subId = 1; //要检查的SIM的subId
if(mTelephonyManager.isDataEnabled(subId)) {
//移动数据已启用
} else {
//移动数据未启用
}
代码链接参考:
- TelephonyManager.isDataEnable()
- SubscriptionManager.getDefaultDataSubscriptionId()
- SubscriptionController.getDefaultSubId()
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