Android 上传图片到服务器时将bitmap转换为byte[]最后转换为String

 1. //上传图片到服务器

        Bitmap bitmap = ………………;//得到图片

        ByteArrayOutputStream out=new ByteArrayOutputStream();

        try {
out.flush();
bitmap.compress(Bitmap.CompressFormat.PNG, 100, out);//转换为png格式的
out.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

        byte[] buffer=out.toByteArray();

        byte[] encode=Base64.decode(buffer, Base64.DEFAULT);
        String photo=new String(encode);

RequestParams params = new RequestParams();
params.put("ImagefileName", fileName);
params.put("filestream", photo);
String url = URLManage.FileUploadImage();
HttpUtil.post(url, params, new JsonHttpResponseHandler() {

…………

}

//AccountSafeActivity

2.根据名称以及url返回bitmap

private static Bitmap getNetBitmap(String strUrl, String fileName,
Context context) {
Bitmap bitmap = null;
try {
URL url = new URL(strUrl);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
con.setDoInput(true);
con.connect();
InputStream in = con.getInputStream();
bitmap = BitmapFactory.decodeStream(in);
FileOutputStream out = context.openFileOutput(fileName,
Context.MODE_PRIVATE);
bitmap.compress(Bitmap.CompressFormat.PNG, 100, out);
out.flush();
out.close();
in.close();
} catch (Exception e) {
e.printStackTrace();
} finally {

}

使用方式

//从服务器获取imageUrl

final String imageUrl = info.getString("ImageUrl");
int loadversion = info.getInt("Version");
if (!TextUtils.isEmpty(imageUrl)) {
if (loadversion > version) {
new Thread() {
public void run() {
getNetBitmap(imageUrl, "load.png",
LogoActivity.this);
}
}.start();
//app.getmSpUtil().setLoadVersion(loadversion);
} else {
if(bitmap==null)
{
bitmap = BitmapFactory
.decodeStream(LogoActivity.this
.openFileInput("load.png"));
image.setBackgroundDrawable(new BitmapDrawable(bitmap));
}
if(bitmap==null)
{
image.setBackgroundResource(
R.drawable.logo);
}
}
}
} else {
image.setBackgroundResource(R.drawable.logo);
}