[英]Android connecting with MySql using AsyncTask and return data in form of JSON or String
我一直在努力将MySql数据库连接到我的Android应用程序并在互联网上搜索。 一些解决方案解决了一个问题。 问题是函数以String的形式返回数据,String的内容是:
[{"id":1,"username":"admin","password":"root","email":"admin@localhost.com","fullname":"Site Admin"}]
但是我希望数据以某种形式存在,通过它我可以分别获得所有用户数据,如电子邮件,全名。 我试图实现一个功能但是没有用。 以下是代码:
BackgroundWorker.java
public class BackgroundWorker extends AsyncTask<String,Void,String> {
Context context;
AlertDialog alertDialog;
String tresult;
BackgroundWorker (Context ctx){
context = ctx;
}
@Override
protected String doInBackground(String... params) {
String type = params[0];
String username = params[1];
String password = params[2];
String login_url = "http://192.168.1.18/myproj/api/query1.php";
if (type.equals("login")){
try {
URL url = new URL(login_url);
HttpURLConnection httpURLConnection = (HttpURLConnection)url.openConnection();
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setDoOutput(true);
httpURLConnection.setDoInput(true);
OutputStream outputStream = httpURLConnection.getOutputStream();
BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream,"UTF-8"));
String post_data = URLEncoder.encode("username","UTF-8")+"="+URLEncoder.encode(username,"UTF-8")+"&"+
URLEncoder.encode("password","UTF-8")+"="+URLEncoder.encode(password,"UTF-8");
bufferedWriter.write(post_data);
bufferedWriter.flush();
bufferedWriter.close();
outputStream.close();
InputStream inputStream = httpURLConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream,"iso-8859-1"));
String line="";
String result="";
while((line = bufferedReader.readLine())!= null){
result+=line;
}
bufferedReader.close();
inputStream.close();
httpURLConnection.disconnect();
return result;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
alertDialog = new AlertDialog.Builder(context).create();
alertDialog.setTitle("Login Status");
}
@Override
protected void onPostExecute(String result) {
alertDialog.setMessage(result);
alertDialog.show();
tresult = result;
//return tresult;
}
@Override
protected void onProgressUpdate(Void... values) {
super.onProgressUpdate(values);
}
}
BackgroundWorker是一个在后台工作并与数据库连接的类。 在MainActivity中,它被称为如下:
MainActivity
public void onLogin(View view, String user, String pass){
String type = "login";
BackgroundWorker backgroundWorker = new BackgroundWorker(this);
backgroundWorker.execute(type,user,pass);
}
调用功能:
loginbtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String username = user_edittext.getText().toString();
String password = pass_edittext.getText().toString();
onLogin(v,username,password);
}
});
简而言之,我想从我的MainActivity
protected void onPostExecute(String result)
返回变量result或tresult,并将其转换为Array。 谢谢! 等待专家意见。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.