1 /* 2 * Copyright (C) 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.ex.camera2.portability.util; 18 19 import com.android.ex.camera2.portability.debug.Log; 20 21 import java.lang.reflect.Method; 22 23 /** 24 * Mirrors hidden class {@link android.os.SystemProperties} (available since API Level 1). 25 */ 26 public final class SystemProperties { 27 private static final Log.Tag TAG = new Log.Tag("SysProps"); 28 29 /** 30 * Gets system properties set by <code>adb shell setprop <em>key</em> <em>value</em></code> 31 * 32 * @param key the property key. 33 * @param defaultValue the value to return if the property is undefined or empty (this parameter 34 * may be {@code null}). 35 * @return the system property value or the default value. 36 */ 37 public static String get(String key, String defaultValue) { 38 try { 39 final Class<?> systemProperties = Class.forName("android.os.SystemProperties"); 40 final Method get = systemProperties.getMethod("get", String.class, String.class); 41 return (String) get.invoke(null, key, defaultValue); 42 } catch (Exception e) { 43 // This should never happen 44 Log.e(TAG, "Exception while getting system property: ", e); 45 return defaultValue; 46 } 47 } 48 49 private SystemProperties() { 50 } 51 } 52
