Android网络应用（图片查看器）

布局：

<?xml version="1.0" encoding="utf-8"?><LinearLayoutandroid:id="@+id/widget32"android:layout_width="fill_parent"android:layout_height="fill_parent"android:orientation="vertical"xmlns:android="http://schemas.android.com/apk/res/android"><ImageViewandroid:id="@+id/iv"android:layout_width="match_parent"android:layout_height="match_parent"android:layout_weight="1000" /><EditTextandroid:id="@+id/et"android:layout_width="match_parent"android:layout_height="wrap_content"android:hint="&#35831;&#36755;&#20837;&#22320;&#22336;"android:textSize="18sp"android:text="http://i7.hexunimg.cn/2013-03-29/152620496.jpg"android:gravity="center" /><Button    android:onClick="click"android:id="@+id/btn"android:layout_width="match_parent"android:layout_height="wrap_content"android:text="&#33719;&#21462;&#24182;&#27983;&#35272;" /></LinearLayout>

核心Activity：

package com.pas.imgviewer;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.URL;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{protected static final int CHANGE_UI = 1;protected static final int TOAST = 2;private Handler handler = new Handler(){@Overridepublic void handleMessage(android.os.Message msg){if (msg.what == CHANGE_UI){ImageView iv = (ImageView) findViewById(R.id.iv);iv.setImageBitmap((Bitmap) msg.obj);}if (msg.what == TOAST){Toast.makeText(MainActivity.this, msg.obj.toString(), Toast.LENGTH_SHORT).show();}};};@Overrideprotected void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);}@Overridepublic 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 click(View view){final String imgurl = ((EditText) findViewById(R.id.et)).getText().toString().trim();if (TextUtils.isEmpty(imgurl)){Toast.makeText(this, "路径不可为空", Toast.LENGTH_SHORT).show();} else{///*// * android 4.0开始网络操作不可以在主线程中进行 会导致ANR// * 需要在子线程中进行 // * 导致ANR原因，主线程做过多耗时的操作// * // */new Thread(){public void run(){try{// 链接服务器URL url = new URL(imgurl);HttpURLConnection conn = (HttpURLConnection) url.openConnection();conn.setRequestMethod("GET");conn.setConnectTimeout(5000);conn.setReadTimeout(10000);// 请求参数// 1、浏览器版本conn.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/21.0.1180.89 Safari/537.1");// 2、Refferconn.setRequestProperty("Referer", "http://image.baidu.com/i?ct=503316480&z=0&tn=baiduimagedetail&ipn=d&word=K29&step_word=&ie=utf-8&in=11493&cl=2&" + "lm=-1&st=-1&pn=4&rn=1&di=76845442520&ln=1951&fr=&&fmq=1390817152763_R&ic=0&s=&se=1&sme=0&tab=&width=0&height=0&face=0&is=&istype=2&ist=&jit=" + "&objurl=http%3A%2F%2Fi7.hexunimg.cn%2F2013-03-29%2F152620496.jpg#pn4&-1&di76845442520&objURLhttp%3A%2F%2Fi7.hexunimg.cn%2F2013-03-29%2F152620496.jpg&" + "fromURLippr_z2C%24qAzdH3FAzdH3Fpjvi_z%26e3Bijx7g_z%26e3Bv54AzdH3Fda8n-an-dlAzdH3F8cdmda9l9_z%26e3Bip4s&W500&H375&T5700&S32&TPjpg");int resCode = conn.getResponseCode();if (resCode == -1){Toast.makeText(MainActivity.this, "获取失败,请检查地址,Code=" + resCode, Toast.LENGTH_SHORT).show();} else if (resCode == 200){InputStream ins = conn.getInputStream();Bitmap img = BitmapFactory.decodeStream(ins);// ImageView iv = (ImageView) findViewById(R.id.iv);// iv.setImageBitmap(img);///*// * 子线程中不可以修改UI // * 刷新UI只能在UI线程当中// * 此处利用android消息处理机制解决// */Message msg = new Message();msg.what = CHANGE_UI;msg.obj = img;handler.sendMessage(msg);} else{Message msg = new Message();msg.what = TOAST;msg.obj = "获取失败,请检查地址,Code=" + resCode;handler.sendMessage(msg);}} catch (Exception e){e.printStackTrace();Message msg = new Message();msg.what = TOAST;msg.obj = "获取失败";handler.sendMessage(msg);}}}.start();}}}

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