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：
复制代码 代码如下:
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();
}
}
以上所述就是本文的全部内容了，希望大家能喜欢。