我怎样才能检测到Android运行（Dalvik的或艺术）？ [英] How can I detect the Android runtime (Dalvik or ART)?

问题描述

谷歌增加了一个新的艺术运行了Android 4.4。如何确定技术或Dalvik的是否为当前运行？

Google added a new ART runtime with Android 4.4. How can I determine whether ART or Dalvik is the current runtime?

推荐答案

至少，早在2014年6月谷歌已经在如何正确地验证当前运​​行在使用：

Update

At least, as early as June 2014 Google has released an official documentation on how to correctly verify the current runtime in use:

您可以验证其运行时正在使用调用System.getProperty（java.vm.version）。如果艺术是在使用中，该属性的值是2.0.0或更高。

You can verify which runtime is in use by calling System.getProperty("java.vm.version"). If ART is in use, the property's value is "2.0.0" or higher.

使用的，现在也没有必要去通过反射和简单地检查相应的系统属性：

With that, now there is no need to go through reflection and simply check the corresponding system property:

private boolean getIsArtInUse() {
    final String vmVersion = System.getProperty("java.vm.version");
    return vmVersion != null && vmVersion.startsWith("2");
}

---

一种可能的方式是读取各个<一href="https://android.googlesource.com/platform/frameworks/base/+/master/core/java/android/os/SystemProperties.java"><$c$c>SystemProperty通过反射。

---

One possible way is to read the respective SystemProperty through reflection.

示例：

package com.example.getcurrentruntimevalue;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public class MainActivity extends Activity {
    private static final String SELECT_RUNTIME_PROPERTY = "persist.sys.dalvik.vm.lib";
    private static final String LIB_DALVIK = "libdvm.so";
    private static final String LIB_ART = "libart.so";
    private static final String LIB_ART_D = "libartd.so";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        TextView tv = (TextView)findViewById(R.id.current_runtime_value);
        tv.setText(getCurrentRuntimeValue());
    }

    private CharSequence getCurrentRuntimeValue() {
        try {
            Class<?> systemProperties = Class.forName("android.os.SystemProperties");
            try {
                Method get = systemProperties.getMethod("get",
                   String.class, String.class);
                if (get == null) {
                    return "WTF?!";
                }
                try {
                    final String value = (String)get.invoke(
                        systemProperties, SELECT_RUNTIME_PROPERTY,
                        /* Assuming default is */"Dalvik");
                    if (LIB_DALVIK.equals(value)) {
                        return "Dalvik";
                    } else if (LIB_ART.equals(value)) {
                        return "ART";
                    } else if (LIB_ART_D.equals(value)) {
                        return "ART debug build";
                    }

                    return value;
                } catch (IllegalAccessException e) {
                    return "IllegalAccessException";
                } catch (IllegalArgumentException e) {
                    return "IllegalArgumentException";
                } catch (InvocationTargetException e) {
                    return "InvocationTargetException";
                }
            } catch (NoSuchMethodException e) {
                return "SystemProperties.get(String key, String def) method is not found";
            }
        } catch (ClassNotFoundException e) {
            return "SystemProperties class is not found";
        }
    }
}

希望这有助于。

Hope this helps.

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