set Field by reflection - Android java.lang.reflect

Android examples for java.lang.reflect:Field

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Description

set Field by reflection

Demo Code


//package com.java2s;
import java.lang.reflect.Field;

import android.text.TextUtils;

public class Main {
    private static final String TARGET_OBJECT = "target object: ";
    private static final String TARGET_OBJECT_CAN_NOT_BE_NULL = "target object can not be null";

    public static void setField(String fieldName, Object target,
            Object value) throws Exception {
        if (TextUtils.isEmpty(fieldName)) {
            throw new RuntimeException("field name can not be empty");
        }//from  w  w w .j a v a  2s  .  co  m
        if (target == null) {
            throw new RuntimeException(TARGET_OBJECT_CAN_NOT_BE_NULL);
        }
        Field field = target.getClass().getDeclaredField(fieldName);
        if (field == null) {
            throw new RuntimeException(TARGET_OBJECT
                    + target.getClass().getName()
                    + " do not have this field: " + fieldName);
        }
        field.setAccessible(true);
        field.set(target, value);
    }
}

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