GetDevicePerformanceClass.java

public class SharedConfig {

    private static int devicePerformanceClass;
    
    public final static int PERFORMANCE_CLASS_LOW = 0;
    public final static int PERFORMANCE_CLASS_AVERAGE = 1;
    public final static int PERFORMANCE_CLASS_HIGH = 2;

    public static int getDevicePerformanceClass() {
        if (devicePerformanceClass == -1) {
            int androidVersion = Build.VERSION.SDK_INT;
            int cpuCount = Runtime.getRuntime().availableProcessors();
            int memoryClass = ((ActivityManager) ApplicationLoader.applicationContext.getSystemService(Context.ACTIVITY_SERVICE)).getMemoryClass();
            int totalCpuFreq = 0;
            int freqResolved = 0;
            for (int i = 0; i < cpuCount; i++) {
                try {
                    RandomAccessFile reader = new RandomAccessFile(String.format(Locale.ENGLISH, "/sys/devices/system/cpu/cpu%d/cpufreq/cpuinfo_max_freq", i), "r");
                    String line = reader.readLine();
                    if (line != null) {
                        totalCpuFreq += Utilities.parseInt(line) / 1000;
                        freqResolved++;
                    }
                    reader.close();
                } catch (Throwable ignore) {}
            }
            int maxCpuFreq = freqResolved == 0 ? -1 : (int) Math.ceil(totalCpuFreq / (float) freqResolved);

            if (androidVersion < 21 || cpuCount <= 2 || memoryClass <= 100 || cpuCount <= 4 && maxCpuFreq != -1 && maxCpuFreq <= 1250 || cpuCount <= 4 && maxCpuFreq <= 1600 && memoryClass <= 128 && androidVersion <= 21 || cpuCount <= 4 && maxCpuFreq <= 1300 && memoryClass <= 128 && androidVersion <= 24) {
                devicePerformanceClass = PERFORMANCE_CLASS_LOW;
            } else if (cpuCount < 8 || memoryClass <= 160 || maxCpuFreq != -1 && maxCpuFreq <= 2050 || maxCpuFreq == -1 && cpuCount == 8 && androidVersion <= 23) {
                devicePerformanceClass = PERFORMANCE_CLASS_AVERAGE;
            } else {
                devicePerformanceClass = PERFORMANCE_CLASS_HIGH;
            }
            if (BuildVars.LOGS_ENABLED) {
                FileLog.d("device performance info (cpu_count = " + cpuCount + ", freq = " + maxCpuFreq + ", memoryClass = " + memoryClass + ", android version " + androidVersion + ")");
            }
        }

        return devicePerformanceClass;
    }
}