How CPU-Z app gives max battery capacity ( in mAh) in Android?

Question

This code gives me 2000 on every single device and all the previous questions of this problem on SO gives irrelevant answers.

Please somebody help

public void getBatteryCapacity() {
    Object mPowerProfile_ = null;

    final String POWER_PROFILE_CLASS = "com.android.internal.os.PowerProfile";

    try {
        mPowerProfile_ = Class.forName(POWER_PROFILE_CLASS)
                .getConstructor(Context.class).newInstance(getContext());
    } catch (Exception e) {
        e.printStackTrace();
    }

    try {
        double batteryCapacity = (Double) Class
                .forName(POWER_PROFILE_CLASS)
                .getMethod("getAveragePower", java.lang.String.class)
                .invoke(mPowerProfile_, "battery.capacity");
        Toast.makeText(getActivity(), batteryCapacity + " mah",
                Toast.LENGTH_LONG).show();
        Log.d("Capacity",batteryCapacity+" mAh");
    } catch (Exception e) {
        e.printStackTrace();
    }
}

But I want max capacity like CPU-Z app gives:

@Amy after replacing getContext() the method is not even running :( — Shiv Pandey, Sep 06 '16 at 10:04
Shouldn't you be calling getMaxPower or something, instead of getAveragePower? — Tim, Sep 06 '16 at 10:12
please refer to the documentation http://grepcode.com/file/repo1.maven.org/maven2/org.robolectric/android-all/4.4_r1-robolectric-1/com/android/internal/os/PowerProfile.java#PowerProfile.getBatteryCapacity%28%29 — Shiv Pandey, Sep 06 '16 at 10:50

score 0 · Answer 1 · answered Sep 06 '16 at 10:32

0

From the documentation attached along with the source code of the PowerProfile class, the method getAveragePower() returns:

the average current in milliAmps.

Instead you have to use getBatteryCapacity() which returns

the battery capacity in mAh

And hence, you have to change the method invocation as getBatteryCapacity() takes no arguments unlike getAveragePower() which takes two arguments, so the code will be like:

public void getBatteryCapacity() {
    Object mPowerProfile_ = null;

    final String POWER_PROFILE_CLASS = "com.android.internal.os.PowerProfile";

    try {
        mPowerProfile_ = Class.forName(POWER_PROFILE_CLASS)
                .getConstructor(Context.class).newInstance(this);
    } catch (Exception e) {
        e.printStackTrace();
    } 

    try {
        double batteryCapacity = (Double) Class
                .forName(POWER_PROFILE_CLASS)
                .getMethod("getBatteryCapacity")
                .invoke(mPowerProfile_);
        Toast.makeText(MainActivity.this, batteryCapacity + " mah",
                Toast.LENGTH_LONG).show();
    } catch (Exception e) {
        e.printStackTrace();
    } 
}

answered Sep 06 '16 at 10:32

Muhammed Refaat

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it too gives 2000 because getBatteryCapcity returns getAveragePower – Shiv Pandey Sep 06 '16 at 11:00
the app ?!! I think they are using another way, even there is another way we don't know, or they are using a way related to API 20 and above only. – Muhammed Refaat Sep 06 '16 at 13:36
This App https://play.google.com/store/apps/details?id=com.cpuid.cpu_z&hl=en gives correct value – Shiv Pandey Sep 06 '16 at 13:38
or may be they checking the device model and compare it to a prestored db. – Muhammed Refaat Sep 06 '16 at 13:39
How could they? App last updated in feb 2016 and so many devices launch every day – Shiv Pandey Sep 06 '16 at 13:43

How CPU-Z app gives max battery capacity ( in mAh) in Android?

1 Answers1