Signal strength display and signal refresh time in Android

The UI Signal display on the android interface is implemented by sending AT commands to the communication module through RIL. For example, at + CSQ, we can obtain real-time RIL information through logcat-B radio.

So how long does the signal display refresh on the interface?

Frameworks/base/telephony/Java/COM/Android/Internal/telephony/servicestatetracker. Java

/** Signal strength poll rate .*/
Protected static final int poll_period_millis = 120*1000;

The signal refresh time is 2 minutes, that is to say, it takes about 2 minutes to display the signal from my boot to the signal, which is too long.

Protected static final int poll_period_millis = 12*1000;

We can change it to 12 seconds.

How can we obtain the signal strength displayed on the interface?

Frameworks/base/packages/systemui/src/COM/Android/systemui/statusbar/statusbarpolicy. Java

If (! Iscdma () {// obtain the GSM signal strength
Int ASU = msignalstrength. getgsmsignalstrength ();

// ASU rangeles from 0 to 31-ts 27.007 sec 8.5
// ASU = 0 (-11db or less) is very weak
// Signal, its better to show 0 bars to the user in such cases.
// ASU = 99 is a special case, where the signal strength is unknown.
If (ASU <= 2 | ASU = 99) iconlevel = 0;
Else if (ASU> = 12) iconlevel = 4;
Else if (ASU> = 8) iconlevel = 3;
Else if (ASU> = 5) iconlevel = 2;
Else iconlevel = 1;

// Though mphone is a manager, this call is not an IPC
If (mphone. isnetworkroaming ()){
Iconlist = ssignalimages_r [minetcondition];
} Else {
Iconlist = ssignalimages [minetcondition];
}
} Else {
Iconlist = ssignalimages [minetcondition];

// If 3G (EV) and 1X network are available than 3G shoshould be // The evdo network is displayed when there are 3G and 1X (Telecom 2.5g) Networks
// Displayed, displayed Arg shocould be from the EV side.
// If a voice call is made then Arg should switch to 1x. // The 1X network is used during the call,
If (mphonestate = telephonymanager. call_state_idle) & isevdo ()){
Iconlevel = getevdolevel ();
If (false ){
Slog. D (TAG, "Use evdo level =" + iconlevel + "to replace CDMA level =" + getcdmalevel ());
}
} Else {
Iconlevel = getcdmalevel ();
}
}
Mphonesignaliconid = iconlist [iconlevel];
Mservice. seticon ("phone_signal", mphonesignaliconid, 0 );
}

Private int getcdmalevel () {// CDMA Signal display
Final int cdmadbm = msignalstrength. getcdmadbm ();
Final int CDMA ecio = msignalstrength. getcdma ecio ();
Int leveldbm = 0;
Int levelecio = 0;

If (cdmadbm> =-75) leveldbm = 4;
Else if (cdmadbm> =-85) leveldbm = 3;
Else if (cdmadbm >=- 95) leveldbm = 2;
Else if (cdmadbm> =-100) leveldbm = 1;
Else leveldbm = 0;

// EC/Io are in dB * 10
If (CDMA ecio> =-90) levelecio = 4;
Else if (CDMA ecio >=- 110) levelecio = 3;
Else if (CDMA ecio >=- 130) levelecio = 2;
Else if (CDMA ecio >=- 150) levelecio = 1;
Else levelecio = 0;

Return (leveldbm <levelecio )? Leveldbm: levelecio;
}

Private int getevdolevel () {// The evdo network displays the CDMA 2000 3G signal (for example, the telecom Tianyi 3G)
Int evdodbm = msignalstrength. getevdodbm ();
Int evdosnr = msignalstrength. getevdosnr ();
Int levelevdodbm = 0;
Int levelevdosnr = 0;

If (evdodbm> =-65) levelevdodbm = 4;
Else if (evdodbm >=- 75) levelevdodbm = 3;
Else if (evdodbm >=- 90) levelevdodbm = 2;
Else if (evdodbm >=- 105) levelevdodbm = 1;
Else levelevdodbm = 0;

If (evdosnr> = 7) levelevdosnr = 4;
Else if (evdosnr> = 5) levelevdosnr = 3;
Else if (evdosnr> = 3) levelevdosnr = 2;
Else if (evdosnr> = 1) levelevdosnr = 1;
Else levelevdosnr = 0;

Return (levelevdodbm <levelevdosnr )? Levelevdodbm: levelevdosnr;
}

Many Android mobile phone signals are not very good. They can modify the above section to maintain the signal displayed on the interface in a certain area, of course, the signal value of each module does not all follow the grading standard of the above Code, and the corresponding at manual must be modified.