Here you can find the source of decodeToFile(String filePath, String base64)
public static void decodeToFile(String filePath, String base64) throws Exception
//package com.java2s; import java.io.ByteArrayInputStream; import java.io.File; import java.io.FileOutputStream; import java.io.InputStream; import java.io.OutputStream; import android.util.Base64; public class Main { private static final int CACHE_SIZE = 1024; public static void decodeToFile(String filePath, String base64) throws Exception { byte[] bytes = decode(base64); bytesToFile(bytes, filePath);/*from w ww . j a va2 s .co m*/ } public static byte[] decode(String base64) throws Exception { return Base64.decode(base64.getBytes(), Base64.DEFAULT); } public static void bytesToFile(byte[] bytes, String filePath) throws Exception { InputStream in = new ByteArrayInputStream(bytes); File destFile = new File(filePath); if (!destFile.getParentFile().exists()) { destFile.getParentFile().mkdirs(); } destFile.createNewFile(); OutputStream out = new FileOutputStream(destFile); byte[] cache = new byte[CACHE_SIZE]; int nRead = 0; while ((nRead = in.read(cache)) != -1) { out.write(cache, 0, nRead); out.flush(); } out.close(); in.close(); } }