How to know a process of an app is 32-bit or 64-bit programmatically in Android lollipop?

Question

As we all know from Android 5.0.64bit support is there. I have very simple question. Can we check programmatically in what mode any application is running ie 32bit or 64bit? For example: I have Facebook app running on my Nexus 9, so can I check using my android app if Facebook app's process is running in 32bit mode or 64bit mode?

Answer 1

In Nexus 5x

String arch = System.getProperty("os.arch");

returns

armv8l

it is not aarch64 and my code broke. However,

root@bullhead:/ # uname -m
aarch64

root@bullhead:/ # getprop ro.product.cpu.abilist
arm64-v8a,armeabi-v7a,armeabi

Wired. So I changed my code to

boolean is64 = (android.os.Build.VERSION.SDK_INT >= 21) && System.getProperty("ro.product.cpu.abilist").contains("64");

Updated on 2016-02-11

In Samsung Samsung Galaxy S5 Neo, Android 5.1.1

String arch = System.getProperty("os.arch");

returns aarch64 but it is not 64-bit device!!!

ro.product.cpu.abilist returns armeabi-v7a,armeabi

bool is64Bit =   System.getProperty("ro.product.cpu.abilist").contains("64");

check is the only way to check.

Answer 2

Try System.getProperty("os.arch") . I haven't tried it on 64-bit android, but it must return something like 'aarch64' in case of 64 bit device.

http://developer.android.com/reference/java/lang/System.html#getProperty(java.lang.String)

Answer 3

In my experience (if your minSdkVersion is >= 21) the best way is to check the size of the array Build.SUPPORTED_64_BIT_ABIS. (see https://developer.android.com/reference/android/os/Build#SUPPORTED_64_BIT_ABIS )

Something like this:

public static boolean is64Bit() {
 return (Build.SUPPORTED_64_BIT_ABIS!= null && Build.SUPPORTED_64_BIT_ABIS.length >0);
}

Answer 4

What makes you think your device isn't 64-bit? The specs for the phone indicate it uses an Exynos 7 Octa 7580 which is arm8 and 64-bit.

Answer 5

boolean is64Arch = Build.CPU_ABI.equalsIgnoreCase("x86_64") || Build.CPU_ABI.equalsIgnoreCase("arm64-v8a");

Answer 6

    public static boolean is64Bit() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            //Added in API level 23
            return Process.is64Bit();
        }
        try {
            Class cls = Class.forName("dalvik.system.VMRuntime");
            Method getRuntimeMethod = cls.getDeclaredMethod("getRuntime");
            Object vmRuntime = getRuntimeMethod.invoke(null);
            Method is64BitMethod = cls.getDeclaredMethod("is64Bit");
            Object is64Bit = is64BitMethod.invoke(vmRuntime);
            if (is64Bit instanceof Boolean) {
                return (boolean) is64Bit;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return false;
    }

IMO, you can use reflect to get the result of is64Bit. Android 6.0 began to provide this api to check your process.

android.os.Process.is64Bit()