Java tutorial
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We also recommend that a * file or class name and description of purpose be included on the * same "printed page" as the copyright notice for easier * identification within third-party archives. * * Copyright 2016 Alibaba Group * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import android.text.TextUtils; public class Main { public static float fastGetFloat(String raw, int precision) { if (!TextUtils.isEmpty(raw)) { boolean positive = true; int loc = 0; if (raw.charAt(0) == '-') { positive = false; loc++; } else if (raw.charAt(0) == '+') { loc++; } char digit; float result = 0; while (loc < raw.length() && (digit = raw.charAt(loc)) >= '0' && digit <= '9') { result = result * 10 + digit - '0'; loc++; } if (loc < raw.length()) { if (raw.charAt(loc) == '.') { loc++; int remainderLength = 10; int counter = 0; while (loc < raw.length() && counter < precision && ((digit = raw.charAt(loc)) >= '0' && digit <= '9')) { result += (digit - '0') / (float) remainderLength; remainderLength *= 10; loc++; counter++; } } else { throw new NumberFormatException("Illegal separator"); } } if (!positive) result *= -1; return result; } throw new NumberFormatException("NullNumber"); } /** * Parse string representation of float. This method intend to be faster than * {@link Float#parseFloat(String)}, but less accuracy. * @param raw * @return */ public static float fastGetFloat(String raw) { return fastGetFloat(raw, Integer.MAX_VALUE); } }