[英]Android connecting with MySql using AsyncTask and return data in form of JSON or String
我一直在努力將MySql數據庫連接到我的Android應用程序並在互聯網上搜索。 一些解決方案解決了一個問題。 問題是函數以String的形式返回數據,String的內容是:
[{"id":1,"username":"admin","password":"root","email":"admin@localhost.com","fullname":"Site Admin"}]
但是我希望數據以某種形式存在,通過它我可以分別獲得所有用戶數據,如電子郵件,全名。 我試圖實現一個功能但是沒有用。 以下是代碼:
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是一個在后台工作並與數據庫連接的類。 在MainActivity中,它被稱為如下:
MainActivity
public void onLogin(View view, String user, String pass){
String type = "login";
BackgroundWorker backgroundWorker = new BackgroundWorker(this);
backgroundWorker.execute(type,user,pass);
}
調用功能:
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);
}
});
簡而言之,我想從我的MainActivity
protected void onPostExecute(String result)
返回變量result或tresult,並將其轉換為Array。 謝謝! 等待專家意見。
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.