问题
I am retrieving cell information data (CellInfo
) from TelephonyManager
For each cell info object, I am querying for mcc (Mobile Country Code) and mnc (Mobile Network Code) via
eachCellInfo.cellIdentity.mcc
eachCellInfo.cellIdentity.mnc
Where eachCellInfo is an object of CellInfo
The function is deprecated as per the doc:
/**
* @return 2 or 3-digit Mobile Network Code, 0..999, Integer.MAX_VALUE if unknown
* @deprecated Use {@link #getMncString} instead.
*/
@Deprecated
public int getMnc() {
return (mMncStr != null) ? Integer.valueOf(mMncStr) : Integer.MAX_VALUE;
}
However when I am using the suggested method that is via
eachCellInfo.cellIdentity.mccString
Method Description:
/**
* @return Mobile Country Code in string format, null if unknown
*/
public String getMccString() {
return mMccStr;
}
I am getting following crash logs:
java.lang.NoSuchMethodError: No virtual method getMccString()Ljava/lang/String; in class Landroid/telephony/CellIdentityLte; or its super classes (declaration of 'android.telephony.CellIdentityLte' appears in /system/framework/framework.jar!classes2.dex)
)
Let me know if I am missing any information and possible cause of this behavior.
Other Infor:
distributionUrl=https\://services.gradle.org/distributions/gradle-4.10.1-all.zip
kotlin_version = '1.3.21'
classpath 'com.google.gms:google-services:4.2.0'
classpath 'com.android.tools.build:gradle:3.3.1'
Debug Version
minifyEnabled false
shrinkResources false
回答1:
This method was introduced in Android api 28 - check here - which means it won't be available in versions before.
This will work on devices running api 28+ and will throw that exception in devices running lower api levels.
Usually the correct way to do this is to introduce checks for the version:
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
// Safe to use getMccString
} else {
// Use something else that could work if there's something
}
Note that just because you can browse the source in your machine it doesn't mean the device running your app will have the same Android code running - most of the time it doesn't.
来源:https://stackoverflow.com/questions/54767020/java-lang-nosuchmethoderror-no-virtual-method-getmccstringljava-lang-string