保存网络图片在sdcard两个方法

Button but = (Button) findViewById(R.id.button1);
        but.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                new Thread() {
                    public void run() {
                        try {
                            writeFileData(
                                    "http://cmsimg02.qiniudn.com/contentimg/2014/06/24/20/02c9fe2c0dee6ad4a9d4761e70101452d7.jpg",
                                    "aaa.png");
                        } catch (Exception e) {
                            e.printStackTrace();
                        }
                    };
                }.start();
            }
        });
    }
    public void writeFileData(String httpUrl, String fileName) {
        File file2 = new File(Environment.getExternalStorageDirectory()
                .getAbsolutePath() + "/yohoboy007/" + fileName);
        file2.getParentFile().mkdirs();
        HttpClient client = new DefaultHttpClient();
        HttpGet get = new HttpGet(httpUrl);
        InputStream inputStream = null;
        FileOutputStream fileOutputStream = null;
        try {
            HttpResponse httpResponse = client.execute(get);
            if (httpResponse.getStatusLine().getStatusCode() == 200) {
                inputStream = httpResponse.getEntity().getContent();
                fileOutputStream = new FileOutputStream(file2);
                byte[] buf = new byte[1024 * 5];
                int lengs;
                while ((lengs = inputStream.read(buf)) != -1) {
                    fileOutputStream.write(buf, 0, lengs);
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (inputStream != null && fileOutputStream != null) {
                try {
                    inputStream.close();
                    fileOutputStream.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }
    }

public void method5(final String url) {
        // String url =
        // "http://cmsimg02.qiniudn.com/contentimg/2014/06/24/20/02c9fe2c0dee6ad4a9d4761e70101452d7.jpg";
        YhHttpUtils.get(url, new BinaryHttpResponseHandler() {
            @Override
            public void onSuccess(byte[] arg0) {
                super.onSuccess(arg0);
                File file = Environment.getExternalStorageDirectory();
                File file2 = new File(file, "yohoboy");
                File file3 = new File(file2, "pic");
                file3.mkdir();
                file3 = new File(file3, getPicName(url));
                try {
                    FileOutputStream oStream = new FileOutputStream(file3);
                    oStream.write(arg0);
                    oStream.flush();
                    oStream.close();
                    // textView.setText("可爱的猫咪已经保存在sdcard里面");
                } catch (Exception e) {
                    e.printStackTrace();
                    Log.i("hck", e.toString());
                }
            }
        });
    }
    public String getPicName(String url) {
        return url.substring(url.lastIndexOf('/') + 1, url.length());
    }