Example usage for java.lang Class getDeclaredField

Introduction

In this page you can find the example usage for java.lang Class getDeclaredField.

Prototype

@CallerSensitive
public Field getDeclaredField(String name) throws NoSuchFieldException, SecurityException

Source Link

Document

Returns a Field object that reflects the specified declared field of the class or interface represented by this Class object.

Usage

From source file:Main.java

public static Activity getCurrentTopActivity()
        throws ClassNotFoundException, IllegalArgumentException, SecurityException, IllegalAccessException,
        InvocationTargetException, NoSuchMethodException, NoSuchFieldException {
    Class<?> activityThreadClass = Class.forName("android.app.ActivityThread");
    Object activityThread = activityThreadClass.getMethod("currentActivityThread").invoke(null);
    Field activitiesField = activityThreadClass.getDeclaredField("mActivities");
    activitiesField.setAccessible(true);
    Map<?, ?> activities = (Map<?, ?>) activitiesField.get(activityThread);
    for (Object activityRecord : activities.values()) {
        Class<?> activityRecordClass = activityRecord.getClass();
        Field pausedField = activityRecordClass.getDeclaredField("paused");
        pausedField.setAccessible(true);
        if (!pausedField.getBoolean(activityRecord)) {
            Field activityField = activityRecordClass.getDeclaredField("activity");
            activityField.setAccessible(true);
            Activity activity = (Activity) activityField.get(activityRecord);
            return activity;
        }//from w  ww.  j av  a 2 s.  c o  m
    }
    return null;
}

From source file:Main.java

private static void setField(Object paramObject1, Class<?> paramClass, String paramString, Object paramObject2)
        throws NoSuchFieldException, IllegalAccessException, IllegalArgumentException {
    Field localField = paramClass.getDeclaredField(paramString);
    localField.setAccessible(true);/*from   ww  w .ja  v a 2s.c  o  m*/
    localField.set(paramObject1, paramObject2);
}

From source file:com.koda.integ.hbase.util.CacheableSerializer.java

@SuppressWarnings("unchecked")
private static Field getProtectedField(Class klass, String fieldName) {
    Field field;/* ww w  . j  a  v  a  2  s. co m*/

    try {
        field = klass.getDeclaredField(fieldName);
        field.setAccessible(true);
    } catch (Exception e) {
        throw new AssertionError(e);
    }

    return field;
}

From source file:io.logspace.it.InfrastructureRule.java

private static Field getField(Class<?> type, String fieldName) {
    Class<?> currentType = type;

    while (currentType != null) {
        try {/* w ww.  ja v a  2  s  .co  m*/
            return currentType.getDeclaredField(fieldName);
        } catch (NoSuchFieldException e) {
            // nothing to do
        } catch (SecurityException e) {
            e.printStackTrace();
        }

        currentType = currentType.getSuperclass();
    }

    return null;
}

From source file:Main.java

public static void dumphreadLocals()
        throws NoSuchFieldException, IllegalAccessException, ClassNotFoundException {
    Thread thread = Thread.currentThread();
    Field threadLocalField = thread.getClass().getDeclaredField("threadLocals");
    threadLocalField.setAccessible(true);
    Object threadLocalTable = threadLocalField.get(thread);

    Class threadLocalMapClass = Class.forName("java.lang.ThreadLocal$ThreadLocalMap");
    //Class threadLocalMapClass = Class.forName(threadLocalField.getType().getName());
    Field tableField = threadLocalMapClass.getDeclaredField("table");
    tableField.setAccessible(true);/*from  ww w .  jav a2 s . co m*/
    Object[] table = (Object[]) tableField.get(threadLocalTable);

    Class threadLocalMapEntryClass = Class.forName("java.lang.ThreadLocal$ThreadLocalMap$Entry");
    Field entryValueField = threadLocalMapEntryClass.getDeclaredField("value");
    entryValueField.setAccessible(true);

    //Field referenceField = Reference.class.getDeclaredField("referent") ;
    //referenceField.setAccessible(true);

    for (Object entry : table) {
        if (entry != null) {
            Object threadLocalValue = entryValueField.get(entry);
            printObject(threadLocalValue);
            //ThreadLocal threadLocal = (ThreadLocal)referenceField.get(entry);
            //System.out.println("thread local  value "+threadLocal);
        }
    }
}

From source file:Main.java

public static void dumphreadLocals() {
    try {/* w  w w  . ja va 2  s  .c  o m*/
        // Get a reference to the thread locals table of the current thread
        Thread thread = Thread.currentThread();
        Field threadLocalsField = Thread.class.getDeclaredField("threadLocals");
        threadLocalsField.setAccessible(true);
        Object threadLocalTable = threadLocalsField.get(thread);

        // Get a reference to the array holding the thread local variables
        // inside the
        // ThreadLocalMap of the current thread
        @SuppressWarnings("rawtypes")
        Class threadLocalMapClass = Class.forName("java.lang.ThreadLocal$ThreadLocalMap");
        Field tableField = threadLocalMapClass.getDeclaredField("table");
        tableField.setAccessible(true);
        Object[] table = (Object[]) tableField.get(threadLocalTable);

        @SuppressWarnings("rawtypes")
        Class threadLocalMapEntryClass = Class.forName("java.lang.ThreadLocal$ThreadLocalMap$Entry");
        Field entryValueField = threadLocalMapEntryClass.getDeclaredField("value");
        entryValueField.setAccessible(true);
        // The key to the ThreadLocalMap is a WeakReference object. The
        // referent field of this object
        // is a reference to the actual ThreadLocal variable
        Field referentField = Reference.class.getDeclaredField("referent");
        referentField.setAccessible(true);

        for (Object entry : table) {
            // Each entry in the table array of ThreadLocalMap is an Entry
            // object
            // representing the thread local reference and its value
            if (entry != null) {

                Object tlcValue = entryValueField.get(entry);

                ThreadLocal threadLocal = (ThreadLocal) referentField.get(entry);

                // System.out.println("thread local value "+tlcValue);
                // if(threadLocal)
                printObject(threadLocal, tlcValue);
            }
        }
        System.out.println("__________________________");
    } catch (Exception e) {
        // We will tolerate an exception here and just log it
        throw new IllegalStateException(e);
    }
}

From source file:com.github.piasy.biv.example.App.java

static void fixLeakCanary696(Context context) {
    if (!isEmui()) {
        Log.w(TAG, "not emui");
        return;// w  w  w.ja  v a  2 s .  c o m
    }
    try {
        Class clazz = Class.forName("android.gestureboost.GestureBoostManager");
        Log.w(TAG, "clazz " + clazz);

        Field _sGestureBoostManager = clazz.getDeclaredField("sGestureBoostManager");
        _sGestureBoostManager.setAccessible(true);
        Field _mContext = clazz.getDeclaredField("mContext");
        _mContext.setAccessible(true);

        Object sGestureBoostManager = _sGestureBoostManager.get(null);
        if (sGestureBoostManager != null) {
            _mContext.set(sGestureBoostManager, context);
        }
    } catch (Exception ignored) {
        ignored.printStackTrace();
    }
}

From source file:Main.java

public static String getResourceString(String paramString, Activity paramActivity) {
    Class localClass = null;
    if (0 == 0)/*from  ww w.ja v  a  2  s .c  o m*/
        ;
    try {
        localClass = Class.forName(paramActivity.getPackageName() + ".R$string");
        String str = paramActivity.getResources()
                .getString(((Integer) localClass.getDeclaredField(paramString).get(null)).intValue());
        return str;
    } catch (Exception localException) {
        Log.e(paramActivity.getPackageName(), localException.getMessage(), localException);
        paramActivity.finish();
    }
    return "";
}

From source file:com.searchbox.core.ref.ReflectionUtils.java

public static Field findUnderlying(Class<?> element, String fieldName) {
    if (element != null) {
        Field field = null;/*from w  w w.  j  a  va2s  .  co m*/
        try {
            field = element.getDeclaredField(fieldName);
        } catch (Exception e) {

        }
        if (field != null) {
            return field;
        } else {
            return findUnderlying(element.getSuperclass(), fieldName);
        }
    } else {
        return null;
    }
}

From source file:com.infinira.aerospike.dataaccess.util.Utils.java

public static boolean set(Object object, String fieldName, Object fieldValue) {
    Assert.notNull(object, "Object cannot be null.");
    Assert.notNull(fieldName, "Fieldname cannot be null.");
    Class<?> clazz = object.getClass();
    while (clazz != null) {
        try {//w ww.  j  ava 2s  .  c om
            Field field = clazz.getDeclaredField(fieldName);
            field.setAccessible(true);
            field.set(object, fieldValue);
            return true;
        } catch (NoSuchFieldException e) {
            clazz = clazz.getSuperclass();
        } catch (Exception e) {
            throw new IllegalStateException(e);
        }
    }
    return false;
}