本文實例講述了Android互聯網訪問圖片并在客戶端顯示的方法。分享給大家供大家參考，具體如下：
1、布局界面
<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: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" > <EditText android:id="@+id/url_text" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_alignParentRight="true" android:layout_alignParentTop="true" android:ems="10" android:inputType="textPostalAddress" android:text="@string/url_text" > <requestFocus /> </EditText> <Button android:id="@+id/btn_text" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/url_text" android:layout_below="@+id/url_text" android:layout_marginTop="32dp" android:onClick="sendHttp" android:text="@string/btn_text" /> <ImageView android:id="@+id/iv_ie" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_alignParentLeft="true" android:layout_alignRight="@+id/url_text" android:layout_below="@+id/btn_text" android:src="@drawable/ic_launcher" /></RelativeLayout>
2、封轉的一些類
URL的封裝：
package com.example.lession08_code.utis;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.URL;import android.graphics.Bitmap;import android.graphics.BitmapFactory;public class HttpUtils { public static String sendGet(String path){ String content=null; try{ //設置訪問的url URL url=new URL(path); //打開請求 HttpURLConnection httpURLConnection=(HttpURLConnection) url.openConnection(); //設置請求的信息 httpURLConnection.setRequestMethod("GET"); //設置請求是否超時 httpURLConnection.setConnectTimeout(5000); //判斷服務器是否響應成功 if(httpURLConnection.getResponseCode()==200){ //獲取響應的輸入流對象 InputStream is=httpURLConnection.getInputStream(); byte data[]=StreamTools.isTodata(is); //把轉換成字符串 content=new String(data); //內容編碼方式 if(content.contains("gb2312")){ content=new String(data,"gb2312"); } } //斷開連接 httpURLConnection.disconnect(); }catch(Exception e){ e.printStackTrace(); } return content; } public static Bitmap sendGets(String path){ Bitmap bitmap=null; try{ //設置訪問的url URL url=new URL(path); //打開請求 HttpURLConnection httpURLConnection=(HttpURLConnection) url.openConnection(); //設置請求的信息 httpURLConnection.setRequestMethod("GET"); //設置請求是否超時 httpURLConnection.setConnectTimeout(5000); //判斷服務器是否響應成功 if(httpURLConnection.getResponseCode()==200){ //獲取響應的輸入流對象 InputStream is=httpURLConnection.getInputStream(); //直接把is的流轉換成Bitmap對象 bitmap=BitmapFactory.decodeStream(is); } //斷開連接 httpURLConnection.disconnect(); }catch(Exception e){ e.printStackTrace(); } return bitmap; }}判斷網絡是否連接的封裝類
package com.example.lession08_code.utis;import android.app.AlertDialog;import android.content.ComponentName;import android.content.Context;import android.content.DialogInterface;import android.content.Intent;import android.net.ConnectivityManager;import android.net.NetworkInfo;import android.widget.Toast;public class NetWorkUtils { private Context context; // 網路鏈接管理對象 public ConnectivityManager connectivityManager; public NetWorkUtils(Context context) { this.context = context; // 獲取網絡鏈接的對象 connectivityManager = (ConnectivityManager) context .getSystemService(Context.CONNECTIVITY_SERVICE); } public boolean setActiveNetWork() { boolean flag=false; // 獲取可用的網絡鏈接對象 NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo(); if (networkInfo == null) { new AlertDialog.Builder(context) .setTitle("網絡不可用") .setMessage("可以設置網絡?") .setPositiveButton("確認", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { Toast.makeText(context, "點擊確認", Toast.LENGTH_LONG).show(); // 聲明意圖 Intent intent = new Intent(); intent.setAction(Intent.ACTION_MAIN); intent.addCategory("android.intent.category.LAUNCHER"); intent.setComponent(new ComponentName( "com.android.settings", "com.android.settings.Settings")); intent.setFlags(0x10200000); // 執行意圖 context.startActivity(intent); } }) .setNegativeButton("取消", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { } }).show();// 必須.show(); } if(networkInfo!=null){ flag=true; } return flag; }}輸出流的封裝類
package com.example.lession08_code.utis;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.InputStream;public class StreamTools { public static byte[] isTodata(InputStream is) throws IOException{ //字節輸出流 ByteArrayOutputStream bops=new ByteArrayOutputStream(); //讀取數據的緩沖區 byte buffer[]=new byte[1024]; //讀取記錄的長度 int len=0; while((len=is.read(buffer))!=-1){ bops.write(buffer, 0, len); } //把讀取的內容轉換成byte數組 byte data[]=bops.toByteArray(); return data; }}注意：在這里還需要加權限問題
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/><uses-permission android:name="android.permission.INTERNET"/>
希望本文所述對大家Android程序設計有所幫助。
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