Here you can find the source of imageScale(Bitmap bitmap, int dst_w, int dst_h)
public static Bitmap imageScale(Bitmap bitmap, int dst_w, int dst_h)
//package com.java2s; /*//from ww w . jav a 2 s. c o m * Copyright (C) 2014 The AppCan Open Source Project. * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License for more details. * You should have received a copy of the GNU Lesser General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. * */ import android.graphics.Bitmap; import android.graphics.Matrix; public class Main { public static Bitmap imageScale(Bitmap bitmap, int dst_w, int dst_h) { int src_w = bitmap.getWidth(); int src_h = bitmap.getHeight(); float scale_w = ((float) dst_w) / src_w; float scale_h = ((float) dst_h) / src_h; Matrix matrix = new Matrix(); matrix.postScale(scale_w, scale_h); Bitmap dstbmp = Bitmap.createBitmap(bitmap, 0, 0, src_w, src_h, matrix, true); return dstbmp; } }