嘛话都不说，直接贴代码，也是在网上找的代码copy出来的！

页面代码

encoding="utf-8"?>

android:orientation="vertical"

android:layout_width="fill_parent"

android:background="@color/white"

android:layout_height="fill_parent">

android:background="@drawable/msg_titbg"

android:layout_width="fill_parent"

android:layout_height="40dp"

android:gravity="center"

android:textColor="@color/black" android:id="@+id/titleName"

android:text="修改用户头像"/>

android:layout_width="fill_parent" android:fadingEdge="none" >

android:layout_width="fill_parent" android:paddingLeft="5.0sp"

android:paddingRight="5.0sp"

android:layout_height="wrap_content"

android:orientation="vertical" android:gravity="center"

android:background="@color/white"

android:fadingEdge="none"

android:paddingTop="70dip">

android:layout_width="fill_parent"

android:layout_height="fill_parent" android:orientation="vertical"

android:gravity="center">

android:id="@+id/userImage" android:layout_width="150px"

android:layout_height="150px"

android:src="@drawable/icon_selfinfo"/>

android:layout_width="fill_parent"

android:orientation="vertical"

android:layout_height="wrap_content"

android:gravity="center"

android:paddingTop="30dp">

android:layout_width="80dp"

android:layout_height="wrap_content" android:background="@drawable/login_btn"

android:text="上传"

android:id="@+id/btn_savaCmt"/>

后台代码

package com.gec.android.activity;

import java.io.ByteArrayOutputStream;

import java.io.File;

import org.json.JSONObject;

import android.app.Activity;

import android.app.AlertDialog;

import android.content.DialogInterface;

import android.content.Intent;

import android.content.SharedPreferences;

import android.graphics.Bitmap;

import android.graphics.drawable.BitmapDrawable;

import android.graphics.drawable.Drawable;

import android.net.Uri;

import android.os.Bundle;

import android.os.Environment;

import android.provider.MediaStore;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.ImageView;

import android.widget.Toast;

public class PicCutActivity extends Activity{

ProcessInfoUtil processInfoUtil = new

ProcessInfoUtil();//底层帮助类与服务器交互

SharedPreferences settings;//用户登录信息

ImageView ib=null;

private byte[] bytes;//得到了裁切后图片的byte[] 在用base64

encodeToString下上传至服务器

boolean isUpload=false;

@Override

protected void onCreate(Bundle

savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.piccut);

settings =

getSharedPreferences("SETTING_Infos", 0);

ib = (ImageView)

findViewById(R.id.userImage);

String result =

processInfoUtil.getCurrentUser();

Drawable img = null;

JSONObject jb = null;

try {

jb = new

JSONObject(result.toString());

img =

ImageUtil.getImgDrawable(getApplicationContext(),

jb.getString("currentUserLogo"), ib);

if (img !=

null || "".equals(img)) {

ib.setImageDrawable(img);

}

} catch (Exception se)

{

se.printStackTrace();

}

ib.setOnClickListener(new

OnClickListener() {

@Override

public void

onClick(View v) {

ShowPickDialog(); }

});

final Button btn = (Button)

findViewById(R.id.btn_savaCmt);

btn.setOnClickListener(new

OnClickListener() {

@Override

public void

onClick(View v) {

btn.setBackgroundDrawable(getResources().getDrawable(R.drawable.login_btn_on));

if

(isUpload) {

ImageUtil

util = new ImageUtil();

String

name = settings.getString("NAME", "");

boolean

isSuc = util.uploadFile(name, "", bytes);

if

(isSuc) {

Toast.makeText(getApplicationContext(),

" 图像上传成功！", 1000).show();

}

else {

Toast.makeText(getApplicationContext(),

" 图像上传失败！", 1000).show();

}

Intent

intent = new Intent();

intent.setClass(PicCutActivity.this,

GecAndroidActivity.class);

intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

// 清除activity

startActivity(intent);

finish();

}

else {

Toast.makeText(getApplicationContext(),

"请先选择新的头像！", 1000).show();

}

}

});

}

private void ShowPickDialog()

{ new AlertDialog.Builder(this) .setTitle("设置头像...") .setNegativeButton("相册", new DialogInterface.OnClickListener()

{ public void onClick(DialogInterface dialog, int which)

{ dialog.dismiss(); Intent

intent = new Intent(Intent.ACTION_PICK,

null);