Java tutorial
//package com.java2s; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import android.graphics.Bitmap; public class Main { public static void saveImage(String imagePath, byte[] buffer) throws IOException { File f = new File(imagePath); if (f.exists()) { return; } else { File parentFile = f.getParentFile(); if (!parentFile.exists()) { parentFile.mkdirs(); } f.createNewFile(); FileOutputStream fos = new FileOutputStream(imagePath); fos.write(buffer); fos.flush(); fos.close(); } } public static void saveImage(String imagePath, Bitmap bm) { if (bm == null || imagePath == null || "".equals(imagePath)) { return; } File f = new File(imagePath); if (f.exists()) { return; } else { try { File parentFile = f.getParentFile(); if (!parentFile.exists()) { parentFile.mkdirs(); } f.createNewFile(); FileOutputStream fos; fos = new FileOutputStream(f); bm.compress(Bitmap.CompressFormat.PNG, 100, fos); fos.close(); } catch (FileNotFoundException e) { f.delete(); e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); f.delete(); } } } }