此代码未将我与我的数据库连接。无论是在寄存器还是在登录情况下。没有语法错误。它会被执行到进度条，然后应用程序转到上一个活动并且进度条会解除。
我使用正确运行的HTML表单测试了我的数据库查询，但是在这里使用Android无法正常工作。
public class Backgroundworker extends AsyncTask<String,Void,String> {
String register_url= "http://10.0.2.2/aps.dp/register.php";
String login_url= "http://10.0.2.2/aps.dp/login.php";
Context cnx;
Activity activity;
AlertDialog.Builder builder;
ProgressDialog progressDialog;
public Backgroundworker(Context cnx){
this.cnx =cnx;
activity = (Activity)cnx;
}
@Override
protected void onPreExecute() {
builder=new AlertDialog.Builder(activity);
progressDialog= new ProgressDialog(cnx);
progressDialog.setTitle("Please Wait");
progressDialog.setMessage("Connecting to server....");
progressDialog.setIndeterminate(true);
progressDialog.setCancelable(false);
progressDialog.show();
}
@Override
protected String doInBackground(String... params) {
String type = params[0];
if (type.equals("register")) {
try {
URL url = new URL(register_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 name = params[1];
String email = params[2];
String password = params[3];
String age = params[4];
String data = URLEncoder.encode("name", "UTF-8") + "=" + URLEncoder.encode(name, "UTF-8")
+ "&" + URLEncoder.encode("email", "UTF-8") + "=" + URLEncoder.encode(email, "UTF-8")
+ "&" + URLEncoder.encode("password", "UTF-8") + "=" + URLEncoder.encode(password, "UTF-8")
+ "&" + URLEncoder.encode("age", "UTF-8") + "=" + URLEncoder.encode(age, "UTF-8");
bufferedWriter.write(data);
bufferedWriter.flush();
bufferedWriter.close();
outputStream.close();
InputStream inputStream = httpURLConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
StringBuilder stringBuilder = new StringBuilder();
String line = "";
while ((line = bufferedReader.readLine()) != null) ;
{
stringBuilder.append(line + "/n");
}
bufferedReader.close();
inputStream.close();
httpURLConnection.disconnect();
Thread.sleep(5000);
return bufferedReader.toString().trim();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
else 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 email = params[1];
String password = params[2];
String data = URLEncoder.encode("email", "UTF-8") + "=" + URLEncoder.encode(email, "UTF-8")
+ "&" + URLEncoder.encode("password", "UTF-8") + "=" + URLEncoder.encode(password, "UTF-8");
bufferedWriter.write(data);
bufferedWriter.flush();
bufferedWriter.close();
outputStream.close();
InputStream inputStream = httpURLConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
StringBuilder stringBuilder = new StringBuilder();
String line = "";
while ((line = bufferedReader.readLine()) != null) ;
{
stringBuilder.append(line + "/n");
}
bufferedReader.close();
inputStream.close();
httpURLConnection.disconnect();
Thread.sleep(5000);
return bufferedReader.toString().trim();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (ProtocolException e) {
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
return null;
}
@Override
protected void onPostExecute(String json) {
try {
progressDialog.dismiss();
JSONObject jsonObject = new JSONObject(json);
JSONArray jsonArray = jsonObject.getJSONArray("server_response");
JSONObject JO = jsonArray.getJSONObject(0);
String code = JO.getString("code");
String message = JO.getString("message");
if (code.equals("reg.true")){
showDialog("Registration Success", message,code);
}
else if (code.equals("reg_false")){
showDialog("Registration Failed", message,code);
}
else if (code.equals("login_ture"))
{
Intent intent = new Intent(activity,MainActivity.class);
intent.putExtra("message",message);
activity.startActivity(intent);
}
else if (code.equals("login_false"))
{
showDialog("Login Error......", message,code);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
@Override
protected void onProgressUpdate(Void... values) {
super.onProgressUpdate(values);
}
public void showDialog (String title, String message,String code ){
builder.setTitle(title);
if ((code.equals("reg_true"))||(code.equals("reg_false")))
{
builder.setMessage(message);
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
activity.finish();
}
});
}
else if (code.equals("login_false"))
{
builder.setMessage(message);
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
EditText email, password;
email = (EditText) activity.findViewById(R.id.logEmail);
password = (EditText) activity.findViewById(R.id.logpass);
email.setText("");
password.setText("");
dialog.dismiss();
}
});
}
AlertDialog alertDialog = builder.create();
alertDialog.show();
}
}