Android实现本地上传图片并设置为圆形头像

先从本地把图片上传到服务器，然后根据URL把头像处理成圆形头像。

因为上传图片用到bmob的平台，所以要到bmob（http://www.bmob.cn）申请密钥。

效果图：

核心代码：

public class MainActivity extends Activity {

        private ImageView iv;

        private String appKey="";                //填写你的Application ID

        private String path=Environment.getExternalStorageDirectory()+"/11.jpeg";        //要上传的图片的路径

        public final int SIZE=2*1024;                

        protected void onCreate(Bundle savedInstanceState) {

                super.onCreate(savedInstanceState);

                Bmob.initialize(this, appKey);                //初始化bmob SDK

                setContentView(R.layout.activity_main);

                initView();

        }

        private void initView() {

                // TODO Auto-generated method stub

                iv=(ImageView)findViewById(R.id.iv);

        }

        /**

         * 上传文件到bmob后台

         * */

        public void upload(View v){

                final BmobFile file=new BmobFile(new File(path));

                file.uploadblock(this, new UploadFileListener() {

                        @Override

                        public void onSuccess() {

                                // TODO Auto-generated method stub

                                Person p=new Person();

                                p.setUrl(file.getFileUrl(MainActivity.this));

                                p.save(MainActivity.this);

                                MyTask task=new MyTask();

                                task.execute(file.getFileUrl(MainActivity.this));

                                toast("上传成功 ");

                        }

                        @Override

                        public void onFailure(int arg0, String arg1) {

                                // TODO Auto-generated method stub

                                toast("上传失败 "+arg1);

                                Log.i("---------", "------error "+arg1);

                        }

                });

        }

        /**

         * 根据URL获取Bitmap

         * */

        public Bitmap getHttpBitmap(String url){

                Bitmap bitmap=null;

                URL myUrl;

                try {

                        myUrl=new URL(url);

                        HttpURLConnection conn=(HttpURLConnection)myUrl.openConnection();

                        conn.setConnectTimeout(5000);

                        conn.connect();

                        InputStream is=conn.getInputStream();

                        bitmap=BitmapFactory.decodeStream(is);

                        //把bitmap转成圆形

                        bitmap=toRoundBitmap(bitmap);

                        is.close();

                } catch (MalformedURLException e) {

                        // TODO Auto-generated catch block

                        e.printStackTrace();

                } catch (IOException e) {

                        // TODO Auto-generated catch block

                        e.printStackTrace();

                }

                //返回圆形bitmap

                return bitmap;

        }

        /**

         * 把bitmap转成圆形

         * */

        public Bitmap toRoundBitmap(Bitmap bitmap){

                int width=bitmap.getWidth();

                int height=bitmap.getHeight();

                int r=0;

                //取最短边做边长

                if(width<height){

                        r=width;

                }else{

                        r=height;

                }

                //构建一个bitmap

                Bitmap backgroundBm=Bitmap.createBitmap(width,height,Config.ARGB_8888);

                //new一个Canvas，在backgroundBmp上画图 

                Canvas canvas=new Canvas(backgroundBm);

                Paint p=new Paint();

                //设置边缘光滑，去掉锯齿 

                p.setAntiAlias(true);

                RectF rect=new RectF(0, 0, r, r);

                //通过制定的rect画一个圆角矩形，当圆角X轴方向的半径等于Y轴方向的半径时，  

                //且都等于r/2时，画出来的圆角矩形就是圆形 

                canvas.drawRoundRect(rect, r/2, r/2, p);

                //设置当两个图形相交时的模式，SRC_IN为取SRC图形相交的部分，多余的将被去掉

                p.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));

                //canvas将bitmap画在backgroundBmp上

                canvas.drawBitmap(bitmap, null, rect, p);

                return backgroundBm;

        }

        class MyTask extends AsyncTask<String, String, Bitmap>{

  

                @Override

                protected Bitmap doInBackground(String... arg0) {

                        // TODO Auto-generated method stub

                        String url=arg0[0];

                        Bitmap bm=getHttpBitmap(url);

                        return bm;

                }

                @Override

                protected void onPostExecute(Bitmap result) {

                        // TODO Auto-generated method stub

                        iv.setImageBitmap(result);

                }

        }

        public void toast(String msg){

                Toast.makeText(this, msg, Toast.LENGTH_SHORT).show();

        }

}

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