Android的HTTP通信 XML解析和异步消息处理

核心提示：employeeElement.getElementsByTagName("dateOfBirth").item(0).getFirstChild().getNodeValue();textView.append("name: "+name+" salary: &quo

employeeElement.getElementsByTagName("dateOfBirth").item(0).getFirstChild().getNodeValue();

textView.append(" name: "+name+" salary: "+salary+" dateOfBirth: " + dateOfBirth);

}

} catch (Exception e) {

textView.setText(e.toString());

}

}

// 以 SAX 方式解析 XML(xml 数据详见 res/raw/employee.xml)

// SAX 解析器的实现详见 MySAXHandler.java

private void SAXDemo(){

try {

SAXParserFactory saxFactory = SAXParserFactory.newInstance();

SAXParser parser = saxFactory.newSAXParser();

XMLReader reader = parser.getXMLReader();

MySAXHandler handler = new MySAXHandler();

reader.setContentHandler(handler);

reader.parse(new InputSource(this.getResources().openRawResource(R.raw.employee)));

String result = handler.getResult();

textView.setText("SAXDemo" + " ");

textView.append(result);

} catch (Exception e) {

textView.setText(e.toString());

}

}

// 辅助方法，用于把流转换为字符串

private String convertStreamToString(InputStream is) {

BufferedReader reader = new BufferedReader(new InputStreamReader(is));

StringBuilder sb = new StringBuilder();

String line = null;

try {

while ((line = reader.readLine()) != null) {

sb.append(line + " ");

}

} catch (IOException e) {

e.printStackTrace();

} finally {

try {

is.close();

} catch (IOException e) {

e.printStackTrace();

}

}

return sb.toString();

}

}

2、用 Handler 来实现异步消息处理，以一个可以实时汇报下载进度的异步下载类为例

开发一个 Android 类库，本例中此类库名为 webabcd_util

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