android - 不幸的是，该应用已停止

This question already has answers here:

Unfortunately MyApp has stopped. How can I solve this?

(20个答案)

4年前关闭。

我试图制作一个登录注册应用程序，但是当我打开注册 Activity 时，它崩溃了。
我似乎无法弄清楚在给定https://www.youtube.com/watch?v=M4VTi5-Aw20的情况下我遵循了教程系列中相同步骤的问题是什么
以下是我的代码:
Register.java:
包com.mohd.loginre;

    import android.content.Intent;
        import android.os.Bundle;
        import android.support.v7.app.ActionBarActivity;
        import android.view.View;
        import android.widget.Button;
        import android.widget.EditText;


        public class Register extends ActionBarActivity implements View.OnClickListener {

        EditText user=(EditText)findViewById(R.id.rusername);
        EditText pass=(EditText)findViewById(R.id.rpassword);
        EditText ag=(EditText)findViewById(R.id.rage);
        Button rsubmit;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_register);
            rsubmit=(Button)findViewById(R.id.rsubmit);
            rsubmit.setOnClickListener( this);
        }


        @Override
        public void onClick(View v) {
            if(v.getId()==R.id.rsubmit){
                String username=user.getText().toString();
                String password=pass.getText().toString();
                int age=Integer.parseInt(ag.getText().toString());
                User user=new User(username,password,age);
                registerhim(user);
            }
        }

        private void registerhim(User user) {
            ServerRequests serverRequest=new ServerRequests(this);
            serverRequest.storeUserDataInBackground(user, new GetUserCallback() {
                @Override
                public void done(User returnedUser) {
                    Intent loginIntent = new Intent(Register.this, Login.class);
                    startActivity(loginIntent);
                }
            });


        }
    }




    ServerRequests.java

    package com.mohd.loginre;

    import android.app.ProgressDialog;
    import android.content.Context;
    import android.os.AsyncTask;
    import android.util.Log;

    import org.apache.http.HttpEntity;
    import org.apache.http.HttpResponse;
    import org.apache.http.NameValuePair;
    import org.apache.http.client.HttpClient;
    import org.apache.http.client.entity.UrlEncodedFormEntity;
    import org.apache.http.client.methods.HttpPost;
    import org.apache.http.impl.client.DefaultHttpClient;
    import org.apache.http.message.BasicNameValuePair;
    import org.apache.http.params.BasicHttpParams;
    import org.apache.http.params.HttpConnectionParams;
    import org.apache.http.params.HttpParams;
    import org.apache.http.util.EntityUtils;
    import org.json.JSONObject;

    import java.util.ArrayList;

    public class ServerRequests {
        ProgressDialog progressDialog;
        public static final int Timeout = 1000 * 15;
        public static final String server = "http://mohdgadi.netai.net/";
    public ServerRequests(Context context) {
        progressDialog = new ProgressDialog(context);
        progressDialog.setCancelable(false);
        progressDialog.setTitle("Processing...");
        progressDialog.setMessage("Please wait...");
    }

    public void storeUserDataInBackground(User user,
                                          GetUserCallback userCallBack) {
        progressDialog.show();
        new StoreUserDataAsyncTask(user, userCallBack).execute();
    }

    public void fetchUserDataAsyncTask(User user, GetUserCallback userCallBack) {
        progressDialog.show();
        new fetchUserDataAsyncTask(user, userCallBack).execute();
    }

    /**
     * parameter sent to task upon execution progress published during
     * background computation result of the background computation
     */

    public class StoreUserDataAsyncTask extends AsyncTask<Void, Void, Void> {
        User user;
        GetUserCallback userCallBack;

        public StoreUserDataAsyncTask(User user, GetUserCallback userCallBack) {
            this.user = user;
            this.userCallBack = userCallBack;
        }

        @Override
        protected Void doInBackground(Void... params) {
            ArrayList<NameValuePair> dataToSend = new ArrayList<>();
            dataToSend.add(new BasicNameValuePair("username", user.username));
            dataToSend.add(new BasicNameValuePair("password", user.password));
            dataToSend.add(new BasicNameValuePair("age", user.age + ""));

            HttpParams httpRequestParams = getHttpRequestParams();

            HttpClient client = new DefaultHttpClient(httpRequestParams);
            HttpPost post = new HttpPost(server
                    + "Register.php");

            try {
                post.setEntity(new UrlEncodedFormEntity(dataToSend));
                client.execute(post);
            } catch (Exception e) {
                e.printStackTrace();
            }

            return null;
        }

        private HttpParams getHttpRequestParams() {
            HttpParams httpRequestParams = new BasicHttpParams();
            HttpConnectionParams.setConnectionTimeout(httpRequestParams,
                   Timeout);
            HttpConnectionParams.setSoTimeout(httpRequestParams,
                    Timeout);
            return httpRequestParams;
        }

        @Override
        protected void onPostExecute(Void result) {
            super.onPostExecute(result);
            progressDialog.dismiss();
            userCallBack.done(null);
        }

    }

    public class fetchUserDataAsyncTask extends AsyncTask<Void, Void, User> {
        User user;
        GetUserCallback userCallBack;

        public fetchUserDataAsyncTask(User user, GetUserCallback userCallBack) {
            this.user = user;
            this.userCallBack = userCallBack;
        }

        @Override
        protected User doInBackground(Void... params) {
            ArrayList<NameValuePair> dataToSend = new ArrayList<>();
            dataToSend.add(new BasicNameValuePair("username", user.username));
            dataToSend.add(new BasicNameValuePair("password", user.password));

            HttpParams httpRequestParams = new BasicHttpParams();
            HttpConnectionParams.setConnectionTimeout(httpRequestParams,
                    Timeout);
            HttpConnectionParams.setSoTimeout(httpRequestParams,
                    Timeout);

            HttpClient client = new DefaultHttpClient(httpRequestParams);
            HttpPost post = new HttpPost(server
                    + "FetchUserData.php");

            User returnedUser = null;

            try {
                post.setEntity(new UrlEncodedFormEntity(dataToSend));
                HttpResponse httpResponse = client.execute(post);

                HttpEntity entity = httpResponse.getEntity();
                String result = EntityUtils.toString(entity);
                JSONObject jObject = new JSONObject(result);

                if (jObject.length() != 0){
                    Log.v("happened", "2");
                    String name = jObject.getString("name");
                    int age = jObject.getInt("age");

                    returnedUser = new User(user.username,
                            user.password,age);
                }

            } catch (Exception e) {
                e.printStackTrace();
            }

            return returnedUser;
        }

        @Override
        protected void onPostExecute(User returnedUser) {
            super.onPostExecute(returnedUser);
            progressDialog.dismiss();
            userCallBack.done(returnedUser);
        }
    }
}

我没有在编译过程中遇到任何错误，但我在模拟器以及Android设备上尝试过此错误，但存在相同的error.Please帮助!

最佳答案

移动

EditText user=(EditText)findViewById(R.id.rusername);
EditText pass=(EditText)findViewById(R.id.rpassword);
EditText ag=(EditText)findViewById(R.id.rage);

在onCreate(..)之后的setContentView(R.layout.activity_register);内部

关于android - 不幸的是，该应用已停止，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/34042782/

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