1、佈局介面

<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{
			//設定訪問的url
			URL url=new URL(path);
			//開啟請求
			HttpURLConnection httpURLConnection=(HttpURLConnection) url.openConnection();
			//設定請求的資訊
			httpURLConnection.setRequestMethod("GET");
			//設定請求是否超時
			httpURLConnection.setConnectTimeout(5000);
			//判斷伺服器是否響應成功
			if(httpURLConnection.getResponseCode()==200){
				//獲取響應的輸入流物件
				InputStream is=httpURLConnection.getInputStream();
				byte data[]=StreamTools.isTodata(is);
				//把轉換成字串
				content=new String(data);
				//內容編碼方式
				if(content.contains("gb2312")){
					content=new String(data,"gb2312");
				}
			}
			//斷開連線
			httpURLConnection.disconnect();
		}catch(Exception e){
			e.printStackTrace();
		}
		
		return content;
	}
	
	
	public static Bitmap sendGets(String path){
		Bitmap bitmap=null;
		try{
			//設定訪問的url
			URL url=new URL(path);
			//開啟請求
			HttpURLConnection httpURLConnection=(HttpURLConnection) url.openConnection();
			//設定請求的資訊
			httpURLConnection.setRequestMethod("GET");
			//設定請求是否超時
			httpURLConnection.setConnectTimeout(5000);
			//判斷伺服器是否響應成功
			if(httpURLConnection.getResponseCode()==200){
				//獲取響應的輸入流物件
				InputStream is=httpURLConnection.getInputStream();
				//直接把is的流轉換成Bitmap物件
				bitmap=BitmapFactory.decodeStream(is);
			}
			//斷開連線
			httpURLConnection.disconnect();
		}catch(Exception e){
			e.printStackTrace();
		}
		
		return bitmap;
	}
}
 

判斷網路是否連線的封裝類

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;

	// 網路連結管理物件
	public ConnectivityManager connectivityManager;

	public NetWorkUtils(Context context) {
		this.context = context;
		// 獲取網路連結的物件
		connectivityManager = (ConnectivityManager) context
				.getSystemService(Context.CONNECTIVITY_SERVICE);
	}

	public boolean setActiveNetWork() {
		boolean flag=false;
		// 獲取可用的網路連結物件
		NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
		if (networkInfo == null) {
			new AlertDialog.Builder(context)
					.setTitle("網路不可用")
					.setMessage("可以設定網路?")
					.setPositiveButton("確認",
							new DialogInterface.OnClickListener() {
								@Override
								public void onClick(DialogInterface dialog,
										int which) {
									Toast.makeText(context, "點選確認",
											Toast.LENGTH_LONG).show();

									
									// 宣告意圖
									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{
		//位元組輸出流
		ByteArrayOutputStream bops=new ByteArrayOutputStream();
		//讀取資料的緩衝區
		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陣列
		byte data[]=bops.toByteArray();
		return data;
	}
}

注意：在這裡還需要加許可權問題

 <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
    <uses-permission android:name="android.permission.INTERNET"/>