本文实例讲述了Android互联网访问图片并在客户端显示的方法。分享给大家供大家参考，具体如下：
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、封转的一些类
URL的封装：
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{ //设置访问的url URL url=new URL(path); //打开请求 HttpURLConnection httpURLConnection=(HttpURLConnection) url.openConnection(); //设置请求的信息 httpURLConnection.setRequestMethod("GET"); //设置请求是否超时 httpURLConnection.setConnectTimeout(5000); //判断服务器是否响应成功 if(httpURLConnection.getResponseCode()==200){ //获取响应的输入流对象 InputStream is=httpURLConnection.getInputStream(); byte data[]=StreamTools.isTodata(is); //把转换成字符串 content=new String(data); //内容编码方式 if(content.contains("gb2312")){ content=new String(data,"gb2312"); } } //断开连接 httpURLConnection.disconnect(); }catch(Exception e){ e.printStackTrace(); } return content; } public static Bitmap sendGets(String path){ Bitmap bitmap=null; try{ //设置访问的url URL url=new URL(path); //打开请求 HttpURLConnection httpURLConnection=(HttpURLConnection) url.openConnection(); //设置请求的信息 httpURLConnection.setRequestMethod("GET"); //设置请求是否超时 httpURLConnection.setConnectTimeout(5000); //判断服务器是否响应成功 if(httpURLConnection.getResponseCode()==200){ //获取响应的输入流对象 InputStream is=httpURLConnection.getInputStream(); //直接把is的流转换成Bitmap对象 bitmap=BitmapFactory.decodeStream(is); } //断开连接 httpURLConnection.disconnect(); }catch(Exception e){ e.printStackTrace(); } return bitmap; } }
判断网络是否连接的封装类
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; // 网路链接管理对象 public ConnectivityManager connectivityManager; public NetWorkUtils(Context context) { this.context = context; // 获取网络链接的对象 connectivityManager = (ConnectivityManager) context .getSystemService(Context.CONNECTIVITY_SERVICE); } public boolean setActiveNetWork() { boolean flag=false; // 获取可用的网络链接对象 NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo(); if (networkInfo == null) { new AlertDialog.Builder(context) .setTitle("网络不可用") .setMessage("可以设置网络") .setPositiveButton("确认", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { Toast.makeText(context, "点击确认", Toast.LENGTH_LONG).show(); // 声明意图 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); // 执行意图 context.startActivity(intent); } }) .setNegativeButton("取消", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { } }).show();// 必须.show(); } if(networkInfo!=null){ flag=true; } return flag; } }
输出流的封装类
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{ //字节输出流 ByteArrayOutputStream bops=new ByteArrayOutputStream(); //读取数据的缓冲区 byte buffer[]=new byte[1024]; //读取记录的长度 int len=0; while((len=is.read(buffer))!=-1){ bops.write(buffer, 0, len); } //把读取的内容转换成byte数组 byte data[]=bops.toByteArray(); return data; } }
注意：在这里还需要加权限问题
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/> <uses-permission android:name="android.permission.INTERNET"/>
希望本文所述对大家Android程序设计有所帮助。