get Hardware Service via reflection - Android Android OS

Android examples for Android OS:Service

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Description

get Hardware Service via reflection

Demo Code

/*******************************************************************************
 * Copyright (c) 2011 MadRobot.//from w  w w . j  a  v a 2 s.c om
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Lesser Public License v2.1
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * 
 * Contributors:
 *  Elton Kent - initial API and implementation
 ******************************************************************************/
//package com.java2s;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import android.os.IBinder;

public class Main {
    private static Object getHardwareService() {
        Class<?> serviceManagerClass = maybeForName("android.os.ServiceManager");
        if (serviceManagerClass == null) {
            return null;
        }

        Method getServiceMethod = maybeGetMethod(serviceManagerClass,
                "getService", String.class);
        if (getServiceMethod == null) {
            return null;
        }

        Object hardwareService = invoke(getServiceMethod, null, "hardware");
        if (hardwareService == null) {
            return null;
        }

        Class<?> iHardwareServiceStubClass = maybeForName("android.os.IHardwareService$Stub");
        if (iHardwareServiceStubClass == null) {
            return null;
        }

        Method asInterfaceMethod = maybeGetMethod(
                iHardwareServiceStubClass, "asInterface", IBinder.class);
        if (asInterfaceMethod == null) {
            return null;
        }

        return invoke(asInterfaceMethod, null, hardwareService);
    }

    private static Class<?> maybeForName(String name) {
        try {
            return Class.forName(name);
        } catch (ClassNotFoundException cnfe) {
            // OK
            return null;
        } catch (RuntimeException re) {
            return null;
        }
    }

    private static Method maybeGetMethod(Class<?> clazz, String name,
            Class<?>... argClasses) {
        try {
            return clazz.getMethod(name, argClasses);
        } catch (NoSuchMethodException nsme) {
            // OK
            return null;
        } catch (RuntimeException re) {
            return null;
        }
    }

    private static Object invoke(Method method, Object instance,
            Object... args) {
        try {
            return method.invoke(instance, args);
        } catch (IllegalAccessException e) {
            return null;
        } catch (InvocationTargetException e) {
            return null;
        } catch (RuntimeException re) {
            return null;
        }
    }
}

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