我正在工作如何在登录和注册后显示警告不同的消息。 由于onPreExecute(),它在登录后显示Login success alertDialog,并进行注册。 我试图使用异常,但我失败了。 我该怎么做呢?
这是BackgroundTask.java
public class BackgroundTask extends AsyncTask<String,Void,String> {
AlertDialog alertDialog;
Context ctx;
BackgroundTask(Context ctx) {
this.ctx = ctx;
}
protected void onPreExecute() {
alertDialog = new AlertDialog.Builder(ctx).create();
alertDialog.setTitle("Loading");
alertDialog.setMessage("Load Success");
alertDialog.show();
}
@Override
protected String doInBackground(String... params) {
String reg_url = "http://35.160.135.119/webapp/register.php";
String login_url = "http://35.160.135.119/webapp/login.php";
String method = params[0];
if (method.equals("register")) {
String user = params[1];
String user_name = params[2];
String user_pass = params[3];
try {
URL url = new URL(reg_url);
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setDoOutput(true);
//httpURLConnection.setDoInput(true);
OutputStream OS = httpURLConnection.getOutputStream();
BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(OS, "UTF-8"));
String data = URLEncoder.encode("user", "UTF-8") + "=" + URLEncoder.encode(user, "UTF-8") + "&" +
URLEncoder.encode("user_name", "UTF-8") + "=" + URLEncoder.encode(user_name, "UTF-8") + "&" +
URLEncoder.encode("user_pass", "UTF-8") + "=" + URLEncoder.encode(user_pass, "UTF-8");
bufferedWriter.write(data);
bufferedWriter.flush();
bufferedWriter.close();
OS.close();
InputStream IS = httpURLConnection.getInputStream();
IS.close();
//httpURLConnection.connect();
httpURLConnection.disconnect();
return "Registration Success...";
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
} else if (method.equals("login")) {
String login_name = params[1];
String login_pass = params[2];
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 data = URLEncoder.encode("login_name", "UTF-8") + "=" + URLEncoder.encode(login_name, "UTF-8") + "&" +
URLEncoder.encode("login_pass", "UTF-8") + "=" + URLEncoder.encode(login_pass, "UTF-8");
bufferedWriter.write(data);
bufferedWriter.flush();
bufferedWriter.close();
outputStream.close();
InputStream inputStream = httpURLConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, "iso-8859-1"));
String response = "";
String line = "";
while ((line = bufferedReader.readLine()) != null) {
response += line;
}
bufferedReader.close();
inputStream.close();
httpURLConnection.disconnect();
return response;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
@Override
protected void onProgressUpdate(Void... values) {
super.onProgressUpdate(values);
}
@Override
protected void onPostExecute(String result) {
if (result.equals("Registration Success...")) {
Toast.makeText(ctx, result, Toast.LENGTH_LONG).show();
} else {
alertDialog.setMessage(result);
alertDialog.show();
}
}
}
这是LoginActivity。
public class LoginActivity extends Activity {
EditText ET_NAME,ET_PASS;
String login_name,login_pass;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
ET_NAME = (EditText)findViewById(R.id.user_name);
ET_PASS = (EditText)findViewById(R.id.user_pass);
}
public void userReg(View view)
{
startActivity(new Intent(this,Register.class));
}
public void userLogin(View view)
{
login_name = ET_NAME.getText().toString();
login_pass = ET_PASS.getText().toString();
String method = "login";
BackgroundTask backgroundTask = new BackgroundTask(this);
backgroundTask.execute(method,login_name,login_pass);
Intent intent = new Intent(this, MainActivity.class);
intent.putExtra("ID", login_name);
intent.putExtra("PW", login_pass);
startActivity(intent);
}
}
这是Register类。
public class Register extends Activity {
EditText ET_NAME, ET_USER_NAME, ET_USER_PASS;
String user, user_name, user_pass;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.register_layout);
ET_NAME = (EditText) findViewById(R.id.user);
ET_USER_NAME = (EditText) findViewById(R.id.new_user_name);
ET_USER_PASS = (EditText) findViewById(R.id.new_user_pass);
}
public void userReg(View view) {
user = ET_NAME.getText().toString();
user_name = ET_USER_NAME.getText().toString();
user_pass = ET_USER_PASS.getText().toString();
String method = "register";
BackgroundTask backgroundTask = new BackgroundTask(this);
backgroundTask.execute(method, user, user_name, user_pass);
finish();
}
}
答案 0 :(得分:0)
抱歉,你做错了。在执行长时间运行之前要完成的事情。例如,显示ProgessDialog。
protected void onPreExecute() {
ProgressDialog progress = ProgressDialog.show(this, "dialog title",
"dialog message", true);
progress.show();
}
@Override
protected String doInBackground(String... params) {
String reg_url = "http://35.160.135.119/webapp/register.php";
String login_url = "http://35.160.135.119/webapp/login.php";
String method = params[0];
if (method.equals("register")) {
String user = params[1];
String user_name = params[2];
String user_pass = params[3];
try {
URL url = new URL(reg_url);
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setDoOutput(true);
//httpURLConnection.setDoInput(true);
OutputStream OS = httpURLConnection.getOutputStream();
BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(OS, "UTF-8"));
String data = URLEncoder.encode("user", "UTF-8") + "=" + URLEncoder.encode(user, "UTF-8") + "&" +
URLEncoder.encode("user_name", "UTF-8") + "=" + URLEncoder.encode(user_name, "UTF-8") + "&" +
URLEncoder.encode("user_pass", "UTF-8") + "=" + URLEncoder.encode(user_pass, "UTF-8");
bufferedWriter.write(data);
bufferedWriter.flush();
bufferedWriter.close();
OS.close();
InputStream IS = httpURLConnection.getInputStream();
IS.close();
//httpURLConnection.connect();
httpURLConnection.disconnect();
return "Registration Success...";
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
} else if (method.equals("login")) {
String login_name = params[1];
String login_pass = params[2];
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 data = URLEncoder.encode("login_name", "UTF-8") + "=" + URLEncoder.encode(login_name, "UTF-8") + "&" +
URLEncoder.encode("login_pass", "UTF-8") + "=" + URLEncoder.encode(login_pass, "UTF-8");
bufferedWriter.write(data);
bufferedWriter.flush();
bufferedWriter.close();
outputStream.close();
InputStream inputStream = httpURLConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, "iso-8859-1"));
String response = "";
String line = "";
while ((line = bufferedReader.readLine()) != null) {
response += line;
}
bufferedReader.close();
inputStream.close();
httpURLConnection.disconnect();
return response;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
@Override
protected void onProgressUpdate(Void... values) {
super.onProgressUpdate(values);
}
@Override
protected void onPostExecute(String result) {
if (result.equals("Registration Success...")) {
Toast.makeText(ctx, result, Toast.LENGTH_LONG).show();
} else {
alertDialog = new AlertDialog.Builder(ctx).create();
alertDialog.setTitle("Loading");
alertDialog.setMessage("Load Success");
alertDialog.show();
alertDialog.setMessage(result);
alertDialog.show();
}
}
答案 1 :(得分:0)
您可以使用constructor
中的BackgroundTask
来指定您要拨打的服务。
public class BackgroundTask extends AsyncTask<String,Void,String> {
AlertDialog alertDialog;
Context ctx;
String request;
public static final int TYPE_LOGIN = 1;
public static final int TYPE_REGISTER = 2;
private int type;
BackgroundTask(Context ctx, int type) {
this.ctx = ctx;
this.type = type;
}
protected void onPreExecute() {
alertDialog = new AlertDialog.Builder(ctx).create();
if(type == TYPE_LOGIN){
alertDialog.setTitle("Loading");
alertDialog.setMessage("Logging you in");
} else if (type == TYPE_REGISTER) {
alertDialog.setTitle("Loading");
alertDialog.setMessage("Registering your account");
}
alertDialog.show();
}
@Override
protected void onPostExecute(String result) {
alertDialog.setTitle("Success");
if(type == TYPE_LOGIN){
alertDialog.setMessage("Login Success");
} else if (type == TYPE_REGISTER) {
alertDialog.setMessage("Registration Success");
}
alertDialog.show();
...
}
}
登录请求的用法,
BackgroundTask backgroundTask = new BackgroundTask(this, BackgroundTask.TYPE_LOGIN);
注册请求的用法,
BackgroundTask backgroundTask = new BackgroundTask(this, BackgroundTask.TYPE_REGISTER);