Signal-Android/app/src/main/java/org/thoughtcrime/securesms/util/DeviceProperties.java

package org.thoughtcrime.securesms.util;

import android.app.ActivityManager;
import android.app.ActivityManager.MemoryInfo;
import android.content.Context;
import android.os.Build;

import androidx.annotation.NonNull;
import androidx.annotation.RequiresApi;

/**
 * Easy access to various properties of the device, typically to make performance-related decisions.
 */
public final class DeviceProperties {

  /**
   * Whether or not we believe the device has the performance capabilities to efficiently render
   * large numbers of APNGs simultaneously.
   */
  public static boolean shouldAllowApngStickerAnimation(@NonNull Context context) {
    if (Build.VERSION.SDK_INT < 26) {
      return false;
    }

    MemoryInfo memoryInfo = getMemoryInfo(context);
    int        memoryMb   = (int) ByteUnit.BYTES.toMegabytes(memoryInfo.totalMem);

    return !isLowMemoryDevice(context) &&
           !memoryInfo.lowMemory       &&
           (memoryMb                >= FeatureFlags.animatedStickerMinimumTotalMemoryMb() ||
            getMemoryClass(context) >= FeatureFlags.animatedStickerMinimumMemoryClass());
  }

  public static boolean isLowMemoryDevice(@NonNull Context context) {
    ActivityManager activityManager = ServiceUtil.getActivityManager(context);
    return activityManager.isLowRamDevice();
  }

  public static int getMemoryClass(@NonNull Context context) {
    ActivityManager activityManager = ServiceUtil.getActivityManager(context);
    return activityManager.getMemoryClass();
  }

  public static @NonNull MemoryInfo getMemoryInfo(@NonNull Context context) {
    MemoryInfo      info            = new MemoryInfo();
    ActivityManager activityManager = ServiceUtil.getActivityManager(context);

    activityManager.getMemoryInfo(info);

    return info;
  }

  @RequiresApi(28)
  public static boolean isBackgroundRestricted(@NonNull Context context) {
    ActivityManager activityManager = ServiceUtil.getActivityManager(context);
    return activityManager.isBackgroundRestricted();
  }
}