Qt Android get phone number

[Creatorczyk]

Hi,
In my mobile app I want get phone number. So I added uses permisions:

<uses-permission android:name="android.permission.READ_PHONE_STATE"/>
<uses-permission android:name="android.permission.READ_PHONE_NUMBERS"/>

And I created class PhoneInfo:

package JavaApi;

import android.content.Context;
import android.telephony.TelephonyManager;

public class PhoneInfo {
    public String getHelloJava() {
            return "Hello java";
        }

    public String getPhoneNumber(){
            TelephonyManager tMgr = (TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);
            String mPhoneNumber = tMgr.getLine1Number();
            return mPhoneNumber;       
       }
}

I try use class by my c++ code:

if(QAndroidJniObject::isClassAvailable("JavaApi/PhoneInfo"))
    {
        QAndroidJniObject someJavaObject = QAndroidJniObject("JavaApi/PhoneInfo");
        qDebug() << someJavaObject.callObjectMethod<jstring>("getHelloJava").toString();
        qDebug() << someJavaObject.callObjectMethod<jstring>("getPhoneNumber").toString();
    }

I tested earlier class "getHelloJava" and it works fine. Now I want use class "getPhone number" but unfortunately I got compile error java file:

:-1: error: /media/sf_GitLab/app/build/android-build/src/PhoneInfo.java:12: error: cannot find symbol


:-1: error:             TelephonyManager tMgr = (TelephonyManager)getSystemService(Context.TELEPHONY_SERVICE);
                                                      ^
  symbol:   method getSystemService(String)
  location: class PhoneInfo
1 error

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':compileDebugJavaWithJavac'.
> Compilation failed; see the compiler error output for details.

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 1s


:-1: error: Building the android package failed!
  -- For more information, run this command with --verbose.

How could I fix it? I dont programing java everyday.

[jsulm]

@Creatorczyk said in Qt Android get phone number:

return PhoneNumber;

There is no such variable in that class.
I guess you mean mPhoneNumber?

[Creatorczyk]

@jsulm Sorry Its error from copy/paste text to this post. I corrected it. I cant still build project

[jsulm]

@Creatorczyk But error message is still the same: cannot find symbol
return PhoneNumber;

Maybe you need to completely rebuild?

[J.Hilk]

@Creatorczyk
I'm by no means an expert in Java, but when I try to access/call getSystemService() I do that on an activity instance. Since your PhoneInfo class does not extend QtActivity try it with

QtNative.activity().getSystemService(...);

[KroMignon]

@Creatorczyk said in Qt Android get phone number:

TelephonyManager tMgr = (TelephonyManager)getSystemService(TELEPHONY_SERVICE);

This cannot work! getSystemService() is a member of android.content.Context

You could try this:

Package JavaApi;

import android.content.Context;
import android.telephony.TelephonyManager;

public class PhoneInfo {
    public String getHelloJava() {
            return "Hello java";
        }

    public String getPhoneNumber(Context context){
            TelephonyManager tMgr = (TelephonyManager)context.getSystemService(Context.TELEPHONY_SERVICE);
            String mPhoneNumber = tMgr.getLine1Number();
            return mPhoneNumber;
        }
}

And, on C++ side:

if(QAndroidJniObject::isClassAvailable("JavaApi/PhoneInfo"))
    {
        QAndroidJniObject someJavaObject = QAndroidJniObject("JavaApi/PhoneInfo");
        qDebug() << someJavaObject.callObjectMethod<jstring>("getHelloJava").toString();
        qDebug() << someJavaObject.callObjectMethod<jstring>(
                                        "getPhoneNumber", 
                                        "(Landroid/content/Context;)Ljava/lang/String;",
                                        QtAndroid::androidContext()
                                         ).toString();
    }

[Creatorczyk]

@KroMignon I got error like bellow when I tried your code:

/media/sf_GitLab/app/app/main.cpp:41: error: no matching member function for call to 'callObjectMethod'
../app/main.cpp:41:36: error: no matching member function for call to 'callObjectMethod'
        qDebug() << someJavaObject.callObjectMethod<jstring>(
                    ~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
/home/john/Qt/5.15.2/android/include/QtAndroidExtras/qandroidjniobject.h:74:23: note: candidate function template not viable: requires single argument 'methodName', but 3 arguments were provided
    QAndroidJniObject callObjectMethod(const char *methodName) const;

                  ^

[KroMignon]

@Creatorczyk said in Qt Android get phone number:

I got error like bellow when I tried your code:

Sorry my mistake, should be:

if(QAndroidJniObject::isClassAvailable("JavaApi/PhoneInfo"))
    {
        QAndroidJniObject javaString;
        QAndroidJniObject someJavaObject = QAndroidJniObject("JavaApi/PhoneInfo");

        javaString = someJavaObject.callObjectMethod("getHelloJava", "()Ljava/lang/String;");
        qDebug() << "getHelloJava() returns: " << (javaString .isValid() ? javaString.toString() : "***ERROR***");

        javaString = someJavaObject.callObjectMethod(
                                        "getPhoneNumber", 
                                        "(Landroid/content/Context;)Ljava/lang/String;",
                                        QtAndroid::androidContext()
                                         );
        qDebug() << "getPhoneNumber() returns:" << (javaString .isValid() ? javaString.toString() : "***ERROR***"); 
    }

[Creatorczyk]

@KroMignon I received error like below:

[KroMignon]

@Creatorczyk Hmm maybe I should take more time before posting!

Should be:

javaString = someJavaObject.callObjectMethod(
                                        "getPhoneNumber", 
                                        "(Landroid/content/Context;)Ljava/lang/String;",
                                        QtAndroid::androidContext().object<jobject>()
                                         );