网络通信之网页源码查看 并显示屏幕上

1.主MainActivity 类代码如下：

public class MainActivity extends Activity {
	private EditText pathText;
	private TextView codeView;
	private Button button;
	private String html;

	Handler handler = new Handler() {
		@Override
		public void handleMessage(Message msg) {
			super.handleMessage(msg);
			codeView.setText(html);
		}
	};
	Runnable runnable = new Runnable() {
		@Override
		public void run() {
			String path = pathText.getText().toString();
			try {
				html = HtmlTool.getHtml(path);

			} catch (Exception e) {
				// TODO Auto-generated catch block
				Toast.makeText(MainActivity.this, "获取图片失败", 1).show();
				e.printStackTrace();
			}
			Message msg = new Message();
			handler.sendMessage(msg);
		}
	};

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		pathText = (EditText) findViewById(R.id.pagepath);
		codeView = (TextView) findViewById(R.id.codeView);
		button = (Button) findViewById(R.id.button);
		button.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				new Thread(runnable).start();
			}
		});
	}
}

2.HtmlTool类代码：

public class HtmlTool {

	public static String getHtml(String path) throws Exception {
		// TODO Auto-generated method stub

		URL url = new URL(path);
		HttpURLConnection connection = (HttpURLConnection) url.openConnection();
		connection.setRequestMethod("GET");
		connection.setConnectTimeout(5000);
		if (connection.getResponseCode() == 200) {
			InputStream inputStream = connection.getInputStream();

			byte data[] = read(inputStream);
			String html = new String(data, "UTF-8");
			return html;
		}
		return null;
	}

	private static byte[] read(InputStream inputStream) throws IOException {
		// TODO Auto-generated method stub

		ByteArrayOutputStream arrayOutputStream = new ByteArrayOutputStream();
		int len = 0;
		byte buffer[] = new byte[1024];
		while ((len = inputStream.read(buffer)) != -1) {
			arrayOutputStream.write(buffer, 0, len);
		}
		// arrayOutputStream.close();
		inputStream.close();
		return arrayOutputStream.toByteArray();
	}

}

3.activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/pagepath" />

    <EditText
        android:id="@+id/pagepath"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="http://blog.youkuaiyun.com/evahuangchen/article/details/48292747" />

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/button" />

    <ScrollView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" >

        <TextView
            android:id="@+id/codeView"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content" />
    </ScrollView>

</LinearLayout>

4.清单文件里加权限：

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

5.运行结果：