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; import android.os.Environment; public class Main { public static void saveWeiboBitmap(Bitmap bitmap, String filename) { String status = Environment.getExternalStorageState(); if (bitmap == null || !status.equals(Environment.MEDIA_MOUNTED)) { return; } File f = new File(filename); FileOutputStream fOut = null; boolean error = false; try { f.createNewFile(); } catch (IOException e1) { e1.printStackTrace(); error = true; } try { fOut = new FileOutputStream(f); } catch (FileNotFoundException e) { e.printStackTrace(); error = true; } try { bitmap.compress(Bitmap.CompressFormat.PNG, 100, fOut); } catch (Exception e) { e.printStackTrace(); error = true; } try { fOut.flush(); } catch (IOException e) { e.printStackTrace(); } try { fOut.close(); } catch (IOException e) { e.printStackTrace(); } } }