从网络上面获得html数据以及 handler Message的使用形式

我们是将这个html义字符串的形式输出

Message msg = Message.obtain();

msg.what = SUCCESS;

msg.obj = result;

handler.sendMessage(msg);

Message msg = Message.obtain();

msg.what = FAILED;

msg.obj = "服务器返回数据失败";

handler.sendMessage(msg);

Message msg = Message.obtain();

msg.what = ERROR;

msg.obj = "网络连接失败";

handler.sendMessage(msg);

private Handler handler = new Handler(){

public void handleMessage(android.os.Message msg) {

String result = (String) msg.obj;

switch (msg.what) {

case SUCCESS:

tv.setText(result);

break;

case FAILED:

Toast.makeText(MainActivity.this, result, 0).show();

break;

case ERROR:

Toast.makeText(MainActivity.this, result, 0).show();

break;

}

};

};

我们返回的数据 就是一个流 但是

public class StreamTools {

/**

* 把输入流转换成一个字符串

* @param is 输入流

* @return 返回一个字符串，如果转换失败就返回一个空字符

*/

public static String readStream(InputStream is){

try {

ByteArrayOutputStream baos = new ByteArrayOutputStream();

byte[] buffer = new byte[1024];

int len = -1;

while((len = is.read(buffer)) != -1){

baos.write(buffer, 0, len);

}

is.close();

return new String(baos.toByteArray());

} catch (Exception e) {

return "";

}

}

}