Android 反射调用SystemProperties

Posted 2022-12-04 peak wang

import java.lang.reflect.Method;

public class SystemProperties


	public static String get(String key)
	
		String ret = null;
		try
		
			Class<?> clazz = Class.forName("android.os.SystemProperties");
			Method mthd = clazz.getMethod("get", new Class[]  String.class );
			mthd.setAccessible(true);
			Object obj = mthd.invoke(clazz, new Object[]  key );
			if (obj != null && obj instanceof String)
			
				ret = (String) obj;

			

		
		catch (Exception e)
		
			e.printStackTrace();

		
		return ret;

	

	public static String get(String key, String def)
	
		String ret = def;
		try
		
			Class<?> clazz = Class.forName("android.os.SystemProperties");
			Method mthd = clazz.getMethod("get", new Class[]  String.class, String.class );
			mthd.setAccessible(true);
			Object obj = mthd.invoke(clazz, new Object[]  key, def );
			if (obj != null && obj instanceof String)
			
				ret = (String) obj;

			
		
		catch (Exception e)
		
			e.printStackTrace();

		

		return ret;
	
	
	public static boolean getBoolean(String key, boolean def)
	
		boolean ret = def;
		try
		
			Class<?> clazz = Class.forName("android.os.SystemProperties");
			Method mthd = clazz.getMethod("getBoolean", new Class[]  String.class, boolean.class );
			mthd.setAccessible(true);
			Object obj = mthd.invoke(clazz, new Object[]  key, def );
			if (obj != null && obj instanceof Boolean)
			
				ret = (Boolean) obj;
			
		
		catch (Exception e)
		
			e.printStackTrace();
		
		return ret;
	
	
	public static int getInt(String key, int def)
	
		int ret = def;
		try
		
			Class<?> clazz = Class.forName("android.os.SystemProperties");
			Method mthd = clazz.getMethod("getInt", new Class[]  String.class, int.class );
			mthd.setAccessible(true);
			Object obj = mthd.invoke(clazz, new Object[]  key, def );
			if (obj != null && obj instanceof Integer)
			
				ret = (Integer) obj;

			

		
		catch (Exception e)
		
			e.printStackTrace();

		
		return ret;

	
	
	public static long getLong(String key, long def)
	
		long ret = def;
		try
		
			Class<?> clazz = Class.forName("android.os.SystemProperties");
			Method mthd = clazz.getMethod("getLong", new Class[]  String.class, long.class );
			mthd.setAccessible(true);
			Object obj = mthd.invoke(clazz, new Object[]  key, def );
			if (obj != null && obj instanceof Long)
			
				ret = (Long) obj;

			

		
		catch (Exception e)
		
			e.printStackTrace();

		
		return ret;
	
	
	public static void set(String key, String value)
	
		try
		
			Class<?> clazz = Class.forName("android.os.SystemProperties");
			Method mthd = clazz.getMethod("set", new Class[]  String.class, String.class );
			mthd.setAccessible(true);
			mthd.invoke(clazz, new Object[]  key, value );
		
		catch (Exception e)
		
			e.printStackTrace();