实验效果：
主要代码：
MainActivity.java package com.example.androidwebpicture; import Java.io.IOException; import java.io.InputStream; import java.NET.HttpURLConnection; import java.Net.MalformedURLException; import java.net.URL; import javax.crypto.spec.IvParameterSpec; import Android.os.Bundle; import android.os.Handler; import android.os.Message; import android.app.Activity; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.text.TextUtils; import android.view.Menu; import android.view.View; import android.widget.EditText; import android.widget.ImageView; import android.widget.Toast; public class MainActivity extends Activity { private EditText etUrl; private ImageView ivImageShow; private static final int SHOWIMAGE=1; private Handler handler=new Handler(){ public void handleMessage(android.os.Message msg) { switch (msg.what) { case SHOWIMAGE: Bitmap bitmap=(Bitmap) msg.obj; ivImageShow.setImageBitmap(bitmap); break; default: break; } }; }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initViews(); } private void initViews() { etUrl=(EditText) findViewById(R.id.etImageUrl); ivImageShow=(ImageView) findViewById(R.id.ivImage); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } public void showImage(View view){ final String path=etUrl.getText().toString(); if(TextUtils.isEmpty(path)){ Toast.makeText(this, "图片不能为空", Toast.LENGTH_LONG).show(); }else{ new Thread(){ public void run(){ try { URL url=new URL(path); HttpURLConnection connection=(HttpURLConnection) url.openConnection(); connection.setRequestMethod("GET"); connection.setConnectTimeout(5000); int responseCode=connection.getResponseCode(); if(responseCode==200){ InputStream inputStream=connection.getInputStream(); Bitmap bitmap=BitmapFactory.decodeStream(inputStream); //ivImageShow.setImageBitmap(bitmap); Message message=new Message(); message.what=SHOWIMAGE; message.obj=bitmap; handler.sendMessage(message); } } catch (MalformedURLException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } }; }.start(); } } } 页面布局代码： <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/LinearLayout1" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".MainActivity" > <ImageView android:id="@+id/ivImage" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_gravity="center" android:layout_weight="1" /> <EditText android:id="@+id/etImageUrl" android:layout_width="match_parent" android:layout_height="wrap_content" android:ems="10" android:text="http://imgsrc.baidu.com/forum/w=580/sign=60880cfd0cf41bd5da53e8fc61db81a0/396a7301213fb80e667a8a0134d12f2ebb3894c4.jpg" /> <Button android:id="@+id/btnView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:onClick="showImage" android:text="浏览" /> </LinearLayout>