知道图片的url，然后通过Picasso进行图片加载 发送广播通知系统图库更新相册
Picasso.with(DiaActivity.this).load(url).into(new Target() { @Override public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom from) { **// 创建目录** File appDir = new File(Environment.getExternalStorageDirectory(), "zhhzFeng"); if (!appDir.exists()) { appDir.mkdir(); } String imageType = getImageType(url); //获取图片类型 String fileName = System.currentTimeMillis() + "." + imageType; File file = new File(appDir, fileName); **//保存图片** try { FileOutputStream fos = new FileOutputStream(file); if(TextUtils.equals(imageType,"jpg")) imageType = "jpeg"; imageType = imageType.toUpperCase(); bitmap.compress(Bitmap.CompressFormat.valueOf(imageType), 100, fos); fos.flush(); fos.close(); Toast.makeText(DiaActivity.this,"保存成功",Toast.LENGTH_SHORT).show(); //Toast } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } **// 其次把文件插入到系统图库** try { MediaStore.Images.Media.insertImage(DiaActivity.this.getContentResolver(), file.getAbsolutePath(), fileName, null); } catch (FileNotFoundException e) { e.printStackTrace(); } **// 最后通知图库更新** DiaActivity.this.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://" + file.getPath()))); } @Override public void onBitmapFailed(Drawable errorDrawable) { } @Override public void onPrepareLoad(Drawable placeHolderDrawable) { } });