Create singleton Instance - Android java.lang.reflect

Android examples for java.lang.reflect:New Instance

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Description

Create singleton Instance

Demo Code

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

import android.util.Log;

public class Main {
  private static final String TAG = "";

  public static Object singletonInstance(String className,
      String singletonMethodName) throws IllegalArgumentException {
    return singletonInstance(className, singletonMethodName, (Object[]) null);
  }//from w  w w.  ja v  a 2 s .com

  public static Object singletonInstance(String className,
      String singletonMethodName, Object... methodArgs)
      throws IllegalArgumentException {
    try {
      Class<?> cls = forName(className);
      Method method = cls.getMethod(singletonMethodName);
      return method.invoke(null, methodArgs);
    } catch (IllegalAccessException e) {
      throw new IllegalArgumentException(
          "IllegalAccessException when unmarshalling: " + className
              + " with method " + singletonMethodName);
    } catch (NoSuchMethodException e) {
      Log.e(TAG, "Method not found when unmarshalling: " + className
          + " with method " + singletonMethodName, e);
      throw new IllegalArgumentException(
          "NoSuchMethodException when unmarshalling: " + className
              + " with method " + singletonMethodName);
    } catch (InvocationTargetException e) {
      throw new IllegalArgumentException(
          "InvocationTargetException when unmarshalling: " + className
              + " with method " + singletonMethodName);
    }
  }

  public static Class<?> forName(String className)
      throws IllegalArgumentException {
    try {
      return Class.forName(className);
    } catch (ClassNotFoundException e) {
      Log.e(TAG, "Illegal access when unmarshalling: " + className, e);
      throw new IllegalArgumentException(
          "ClassNotFoundException when unmarshalling: " + className);
    }
  }
}

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