DJ. Aduvanchik DJ. Aduvanchik - 10 days ago 6
Android Question

Why does my java code always print out zero for signal strength in android studio

I am pretty new to coding and this is my first time working with telephonymanager. I can't figure out why the textview only prints out a zero when i hit the button in this code. I need it to print out the signal strength. The app compiles and runs and the permissions are there so I am out of ideas right now.
Please and thank you.

package com.example.vitaliy_2.signalminer11;

import android.Manifest;
import android.content.Context;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Bundle;
import android.support.annotation.RequiresApi;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.telephony.PhoneStateListener;
import android.telephony.SignalStrength;
import android.telephony.TelephonyManager;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class Menu extends AppCompatActivity{

TextView cdmaSignal;
Button cellButt;
String cap;

TelephonyManager tm;
MMPSL mm;
float sigstr;

int permissionCheck;


@RequiresApi(api = Build.VERSION_CODES.N)
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_menu);
cdmaSignal = (TextView) findViewById(R.id.cdmaSignal);
cellButt = (Button) findViewById(R.id.cellButt);
mm = new MMPSL();
tm = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
tm.listen(mm,PhoneStateListener.LISTEN_SIGNAL_STRENGTHS);

permissionCheck = ContextCompat.checkSelfPermission(Menu.this,
Manifest.permission.READ_PHONE_STATE);

cap = Float.toString(sigstr);
String nmp = "Permission required for the continued function of the phone signal monitor ";
if(permissionCheck != PackageManager.PERMISSION_GRANTED){
if (ActivityCompat.shouldShowRequestPermissionRationale(this,
Manifest.permission.READ_PHONE_STATE)) {

} else {

ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.READ_PHONE_STATE},
1);
}

cdmaSignal.setText(nmp);
}

}
public void clkFrSgnl(View view){
cdmaSignal.setText(cap);
// tts = Integer.toString(gs.signal);
//gsmSignal.setText(tts);
}


class MMPSL extends PhoneStateListener{
@Override
public void onSignalStrengthsChanged(SignalStrength signalStrength) {
super.onSignalStrengthsChanged(signalStrength);
sigstr = signalStrength.getCdmaDbm();
sigstr = (2 * sigstr) - 113;
}
}

}


This is the xml file

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_menu"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.vitaliy_2.signalminer11.Menu">

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/cell_signal_CDMA"
android:textAlignment="center"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:id="@+id/cdmaSignal"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true" />

<Button
android:text="@string/get_signal_CDMA"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:id="@+id/cellButt"
android:onClick="clkFrSgnl" />
</RelativeLayout>


From what I've done in the past, the andoroid:onClick function was enough for the button and the in the code. the view class is called

Answer
public void clkFrSgnl(View view){
  cap = Float.toString(sigstr);
  cdmaSignal.setText(cap);
}