code: package com.lody.virtual.helper;
  
  import android.os.Build;
  
  import java.io.File;
  import java.io.IOException;
  import java.io.InputStream;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.concurrent.Executor;
  import java.util.concurrent.Executors;
  
  import mirror.dalvik.system.VMRuntime;
  
  /**
   * @author Lody
   */
  public class ArtDexOptimizer {
  
      /**
       * Optimize the dex in interpret mode.
       *
       * @param dexFilePath dex file path
       * @param oatFilePath oat file path
       * @throws IOException
       */
      public static void interpretDex2Oat(String dexFilePath, String oatFilePath) throws IOException {
          final File oatFile = new File(oatFilePath);
          if (!oatFile.exists()) {
              oatFile.getParentFile().mkdirs();
          }
  
          final List<String> commandAndParams = new ArrayList<>();
          commandAndParams.add("dex2oat");
          // for 7.1.1, duplicate class fix
          if (Build.VERSION.SDK_INT >= 24) {
              commandAndParams.add("--runtime-arg");
              commandAndParams.add("-classpath");
              commandAndParams.add("--runtime-arg");
              commandAndParams.add("&");
          }
          commandAndParams.add("--dex-file=" + dexFilePath);
          commandAndParams.add("--oat-file=" + oatFilePath);
          commandAndParams.add("--instruction-set=" + VMRuntime.getCurrentInstructionSet.call());
          if (Build.VERSION.SDK_INT > 25) {
              commandAndParams.add("--compiler-filter=quicken");
          } else {
              commandAndParams.add("--compiler-filter=interpret-only");
          }
  
          final ProcessBuilder pb = new ProcessBuilder(commandAndParams);
          pb.redirectErrorStream(true);
          final Process dex2oatProcess = pb.start();
          StreamConsumer.consumeInputStream(dex2oatProcess.getInputStream());
          StreamConsumer.consumeInputStream(dex2oatProcess.getErrorStream());
          try {
              final int ret = dex2oatProcess.waitFor();
              if (ret != 0) {
                  throw new IOException("dex2oat works unsuccessfully, exit code: " + ret);
              }
          } catch (InterruptedException e) {
              throw new IOException("dex2oat is interrupted, msg: " + e.getMessage(), e);
          }
      }
  
      private static class StreamConsumer {
          static final Executor STREAM_CONSUMER = Executors.newSingleThreadExecutor();
  
          static void consumeInputStream(final InputStream is) {
              STREAM_CONSUMER.execute(new Runnable() {
                  @Override
                  public void run() {
                      if (is == null) {
                          return;
                      }
                      final byte[] buffer = new byte[256];
                      try {
                          while ((is.read(buffer)) > 0) {
                              // To satisfy checkstyle rules.
                          }
                      } catch (IOException ignored) {
                          // Ignored.
                      } finally {
                          try {
                              is.close();
                          } catch (Exception ignored) {
                              // Ignored.
                          }
                      }
                  }
              });
          }
      }
  }
  