1、首先實現介面的佈局

效果如下

程式碼佈局程式碼如下

<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"
    tools:context="${packageName}.${activityClass}" >

    <EditText
        android:id="@+id/et_url"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="textUri"
        android:text="@string/http_url" />

    <Button
        android:id="@+id/btn_send"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/et_url"
        android:text="@string/btn_send"
        android:onClick="sendHttpUrl" />

    <ScrollView
        android:id="@+id/sc"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_below="@+id/btn_send" >

        <TextView
            android:id="@+id/tv_code"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="@string/tv_tip" />
    </ScrollView>

</RelativeLayout>
 

2、新增jar檔案android-async-http-1.4.4.jar

3、建立監聽事件sendHttpUrl

4、獲取地址引數

5、建立客戶端物件

AsyncHttpClient client = new AsyncHttpClient();

6、返回內容

String result = new String(responseBody,default_charset);//default_charset網頁編碼方式

7、設定控制元件文字

tv_text.setText(result);

通過這幾步基本實現了獲取網頁原始碼的功能

8、加強

通過獲取Content-Type的值來獲取網頁的編碼方式

//獲取Content-Type的值 text/html; charset=utf-8
for (Header header : headers) {
<span style="white-space:pre">	</span>if (header.equals(contentType_value)) {
	<span style="white-space:pre">	</span>// header.
	<span style="white-space:pre">	</span>contentType_value = header.getValue();
	}
}
 

1. Content-Type獲取的值為“ text/html; charset=utf-8" 通過判斷字串中字元的“=”的位置確定網頁編碼的字串，即index+1到contentType_value.length()。陣列獲取長度為length，字串獲取長度為length()。

//處理Content-Type的值，獲取網頁編碼方式
if (contentType_value != null) {
	if (contentType_value.contains("=")) {
		int index = contentType_value.indexOf("=");
		default_charset = contentType_value.substring(
		index + 1, contentType_value.length());
	} else {
		String result = new String(responseBody);
		default_charset = getCharset(result);
	<span style="white-space:pre">	</span>}
<span style="white-space:pre">	</span>} else {
		String result = new String(responseBody);
	<span style="white-space:pre">	</span>default_charset = getCharset(result);
}

private String getCharset(String result) {
	// TODO Auto-generated method stub
	String defaultCharset = null;
	if (result != null) {
		//content=\"text/html; charset=GBK\   中間沒有空格
		if (result.contains("content=\"text/html; charset=GBK\"")) {
			defaultCharset = "GBK";
		} else if (result.contains("content=\"text/html; charset=UTF-8\"")) {
			defaultCharset = "UTF-8";
		} else if (result.contains("content=\"text/html; charset=gb2312\"")) {
			defaultCharset = "gb2312";
		} else if (result.contains("charset=\"UTF-8\"")) {
			defaultCharset = "UTF-8";
		} else if (result.contains("charset=\"GBK\"")) {
		<span style="white-space:pre">	</span>defaultCharset = "GBK";
		}

	}
	return defaultCharset;
}

package www.csdn.net.webcode;

import java.io.UnsupportedEncodingException;

import org.apache.http.Header;

import com.loopj.android.http.AsyncHttpClient;
import com.loopj.android.http.AsyncHttpResponseHandler;

import android.app.Activity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {

	private EditText et_url;
	private TextView tv_text;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		et_url = (EditText) findViewById(R.id.et_url);
		tv_text = (TextView) findViewById(R.id.tv_code);
	}

	public void sendHttpUrl(View v) {
		int i = v.getId();
		switch (i) {
		case R.id.btn_send:
			String url = et_url.getText().toString();
			if (TextUtils.isEmpty(url)) {
				Toast.makeText(this, "地址不能為空", Toast.LENGTH_LONG).show();
			} else {
				AsyncHttpClient client = new AsyncHttpClient();
				client.get(url, new AsyncHttpResponseHandler() {

					@Override
					public void onSuccess(int statusCode, Header[] headers,
							byte[] responseBody) {
						// TODO Auto-generated method stub

						String contentType_value = null;
						//獲取Content-Type的值 text/html; charset=utf-8
						for (Header header : headers) {
							if (header.equals(contentType_value)) {
								// header.
								contentType_value = header.getValue();
							}
						}

						String default_charset = "UTF-8";
						//處理Content-Type的值，獲取網頁編碼方式
						if (contentType_value != null) {
							if (contentType_value.contains("=")) {
								int index = contentType_value.indexOf("=");
								default_charset = contentType_value.substring(
										index + 1, contentType_value.length());
							} else {
								String result = new String(responseBody);
								default_charset = getCharset(result);
							}
						} else {
							String result = new String(responseBody);
							default_charset = getCharset(result);
						}

						Toast.makeText(MainActivity.this,
								"編碼是" + default_charset, 1).show();

						if (statusCode == 200) {
							try {
								String result = new String(responseBody,
										default_charset);
								tv_text.setText(result);
							} catch (UnsupportedEncodingException e) {
								// TODO Auto-generated catch block
								e.printStackTrace();
								System.out.println(e.getMessage());
							}
						} else {
							System.out.println("發生錯誤");
						}
					}

					private String getCharset(String result) {
						// TODO Auto-generated method stub
						String defaultCharset = null;
						if (result != null) {
							//content=\"text/html; charset=GBK\   中間沒有空格
							if (result
									.contains("content=\"text/html; charset=GBK\"")) {
								defaultCharset = "GBK";
							} else if (result
									.contains("content=\"text/html; charset=UTF-8\"")) {
								defaultCharset = "UTF-8";
							} else if (result
									.contains("content=\"text/html; charset=gb2312\"")) {
								defaultCharset = "gb2312";
							} else if (result.contains("charset=\"UTF-8\"")) {
								defaultCharset = "UTF-8";
							} else if (result.contains("charset=\"GBK\"")) {
								defaultCharset = "GBK";
							}

						}
						return defaultCharset;
					}

				});
			}
			break;
		}
	}
}