Android实现网页图片浏览功能

本文实例为大家分享了AndAndroid实现网页图片浏览的具体代码，供大家参考，具体内容如下

基本功能：输入图片的url然后点击按钮加载出来图片

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:id="@+id/activity_main"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical"
 tools:context="cn.edu.bzu.imageview.MainActivity"> 

 <ImageView
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:id="@+id/iv"
  android:layout_weight="1000"
  />
 <EditText
  android:id="@+id/et_path"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:hint="请输入图片的路径"
  android:text="http://pic.58pic.com/58pic/16/62/63/97m58PICyWM_1024.jpg"
  android:singleLine="true" />
 <Button
  android:text="浏览"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:onClick="click"/>
</LinearLayout>

MainActivity：

package cn.edu.bzu.imageview; 

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.text.TextUtils;
import android.view.View;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast; 

import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL; 

public class MainActivity extends Activity {
 protected static final int CHANGE_UI = 1;
 protected static final int ERROR = 2;
 private EditText et_path;
 private ImageView iv;
 private Handler handler = new Handler() {
  public void handleMessage(Message msg) {
   if (msg.what == CHANGE_UI) {
    Bitmap bitmap = (Bitmap) msg.obj;
    iv.setImageBitmap(bitmap); 

   } else if (msg.what == ERROR) {
    Toast.makeText(MainActivity.this, "显示图片错误",Toast.LENGTH_SHORT).show();
   }
  } 

  ;
 }; 

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  et_path = (EditText) findViewById(R.id.et_path);
  iv = (ImageView) findViewById(R.id.iv);
 } 

 public void click(View view) {
  final String path = et_path.getText().toString().trim();
  if (TextUtils.isEmpty(path)) {
   Toast.makeText(this, "图片路径不能为空", Toast.LENGTH_SHORT).show();
  } else {
//子线程请求网络，android4.0以后访问网络不能放在主线程中
   new Thread() {
    private HttpURLConnection conn;
    private Bitmap bitmap; 

    public void run() {//连接服务器get请求，获取图片
     //创建URL对象
     try {
      URL url = new URL(path);
      conn = (HttpURLConnection) url.openConnection();//根据url发送http的请求
      conn.setRequestMethod("GET");//设置请求的方式
      conn.setConnectTimeout(5000);//设置超时时间
      conn.setRequestProperty("User-Agent", "Mozilla/4.0(compatible;MSIE 6.0;Windows NT 5.1;" + "SV1;.NET4.0C;.NET4.0E;.NET CLR 2.0.50727;" + ".NET CLR 3.0.4506.2152;.NET CLR 3.5.30729;Shuame)");//设置浏览器的版本
      int code = conn.getResponseCode();//得到服务器返回的响应码
      if (code == 200) {//请求成功后返回码是200
       InputStream is = conn.getInputStream();
       bitmap = BitmapFactory.decodeStream(is);
       Message msg = new Message();
       msg.what = CHANGE_UI;
       msg.obj = bitmap;
       handler.sendMessage(msg);
      } else {
       Message msg = new Message();
       msg.what = ERROR;
       handler.sendMessage(msg);
      } 

     } catch (java.io.IOException e) {
      e.printStackTrace();
      Message msg = new Message();
      msg.what = ERROR;
      handler.sendMessage(msg);
     }
    }
   }.start();
  }
 }

这样基本功能就能实现了。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持我们。