<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"

    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    android:paddingBottom="@dimen/activity_vertical_margin"

    tools:context="com.basillee.asus.demo.MainActivity3">

<ImageView

    android:id="@+id/imageView"

    android:layout_width="wrap_content"

    android:layout_height="wrap_content"

    android:layout_centerInParent="true"

></ImageView>

</RelativeLayout>

package com.basillee.asus.demo;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.os.Bundle;

import android.support.v7.app.ActionBarActivity;

import android.widget.ImageView;

import java.io.IOException;

import java.io.InputStream;

import java.net.MalformedURLException;

import java.net.URL;

import java.net.URLConnection;

public class MainActivity3 extends ActionBarActivity {

    private ImageView imageView=null;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main_activity3);

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

        new Thread(new Runnable() {

            @Override

            public void run() {

                final Bitmap bitmap=getPicture("http://h.hiphotos.baidu.com/news/q%3D100/sign=be8e90f30cfa513d57aa68de0d6d554c/c75c10385343fbf29d10a30cb47eca8065388fe4.jpg");

                try {

                    Thread.sleep();

                } catch (InterruptedException e) {

                    e.printStackTrace();

                }

                imageView.post(new Runnable() {

                    @Override

                    public void run() {

                        imageView.setImageBitmap(bitmap);

                    }

                });

            }

        }).start();

    }

    public Bitmap getPicture(String path){

        Bitmap bm=null;

        try{

            URL url=new URL(path);

            URLConnection connection=url.openConnection();

            connection.connect();

            InputStream inputStream=connection.getInputStream();

            bm= BitmapFactory.decodeStream(inputStream);

        } catch (MalformedURLException e) {

            e.printStackTrace();

        } catch (IOException e) {

            e.printStackTrace();

        }

        return  bm;

    }

}