我正在使用登录和注册功能创建应用程序。我正在使用wamp服务器为我的应用程序执行数据库。但是当我在手机上运行应用程序时，它会一直显示以下错误;并且没有任何东西存储在本地主机数据库中。大约2周时间我一直在努力解决这个问题但仍然无法解决。有人可以帮助我吗？
16071/com.example.chang.e_ktm E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.chang.e_ktm, PID: 16071
java.lang.IllegalStateException: Could not execute method of the activity
at android.view.View$1.onClick(View.java:4074)
at android.view.View.performClick(View.java:4848)
at android.view.View$PerformClick.run(View.java:20300)
at android.os.Handler.handleCallback(Handler.java:815)
at android.os.Handler.dispatchMessage(Handler.java:104)
at android.os.Looper.loop(Looper.java:210)
at android.app.ActivityThread.main(ActivityThread.java:5830)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1113)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:879)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at android.view.View$1.onClick(View.java:4069)
at android.view.View.performClick(View.java:4848)
at android.view.View$PerformClick.run(View.java:20300)
at android.os.Handler.handleCallback(Handler.java:815)
at android.os.Handler.dispatchMessage(Handler.java:104)
at android.os.Looper.loop(Looper.java:210)
at android.app.ActivityThread.main(ActivityThread.java:5830)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1113)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:879)
Caused by: java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
at android.view.ViewGroup.addViewInner(ViewGroup.java:4088)
at android.view.ViewGroup.addView(ViewGroup.java:3938)
at android.view.ViewGroup.addView(ViewGroup.java:3910)
at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:464)
at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:445)
at android.app.Activity.setContentView(Activity.java:2218)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at android.view.View$1.onClick(View.java:4069)
at android.view.View.performClick(View.java:4848)
at android.view.View$PerformClick.run(View.java:20300)
at android.os.Handler.handleCallback(Handler.java:815)
at android.os.Handler.dispatchMessage(Handler.java:104)
at android.os.Looper.loop(Looper.java:210)
at android.app.ActivityThread.main(ActivityThread.java:5830)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1113)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:879)
这是我的Register.java文件
package com.example.chang.e_ktm;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import java.lang.String;
public class RegisterActivity extends Activity {
Button reg_button;
EditText etName, etUserName, etPassword, etAge, etEmail;
String name, user_name, password, email;
int age;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_register);
etName = (EditText) findViewById(R.id.etName);
etUserName = (EditText) findViewById(R.id.etUserName);
etPassword = (EditText) findViewById(R.id.etPassword);
etAge = (EditText) findViewById(R.id.etAge);
etEmail = (EditText) findViewById(R.id.etEmail);
reg_button = (Button)findViewById(R.id.bRegister);
}
public void userReg(View view)
{
name = etName.getText().toString();
user_name = etUserName.getText().toString();
password = etPassword.getText().toString();
age = Integer.parseInt(etAge.getText().toString());
email = etEmail.getText().toString();
String method = "register";
BackgroundTask backgroundTask = new BackgroundTask(this);
backgroundTask.execute(method, name,user_name,password,age,email);
finish();
}
}
，这个是BackgroundTask.java文件
package com.example.chang.e_ktm;
import android.content.Context;
import android.os.AsyncTask;
import android.widget.Toast;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
/**
* Created by Chang on 21/9/2016.
*/
public class BackgroundTask extends AsyncTask<String,Void,String> {
Context ctx;
BackgroundTask(Context ctx)
{
this.ctx = ctx;
}
@Override
protected void onPreExecute(){
super.onPreExecute();
}
@Override
protected String doInBackground(String... params) {
String reg_url = "http://192.168.0.104/register.php";
String login_url = "http://192.168.0.104/login.php";
String method = params[0];
if(method.equals("register"))
{
String name = params[1];
String user_name = params[2];
String password = params[3];
int age = Integer.parseInt(params[4]);
String email = params[5];
try{
URL url = new URL(reg_url);
HttpURLConnection httpURLConnection = (HttpURLConnection)url.openConnection();
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setDoOutput(true);
OutputStream OS = httpURLConnection.getOutputStream();
BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(OS,"UTF-8"));
String data = URLEncoder.encode("user", "UTF-8") + "="+URLEncoder.encode(name,"UTF-8") +"&"+
URLEncoder.encode("user_name", "UTF-8") + "="+URLEncoder.encode(user_name, "UTF-8") +"&"+
URLEncoder.encode("password", "UTF-8") + "="+URLEncoder.encode(password, "UTF-8") +"&"+
URLEncoder.encode("age", "UTF-8") + "="+URLEncoder.encode(String.valueOf(age), "UTF-8") +"&"+
URLEncoder.encode("email", "UTF-8") + "="+URLEncoder.encode(email, "UTF-8");
bufferedWriter.write(data);
bufferedWriter.flush();
bufferedWriter.close();
OS.close();
InputStream IS = httpURLConnection.getInputStream();
IS.close();
return "Registration Success";
}catch(IOException e)
{
e.printStackTrace();
}
}
return null;
}
@Override
protected void onProgressUpdate(Void...values){
super.onProgressUpdate(values);
}
@Override
protected void onPostExecute(String result){
Toast.makeText(ctx,result,Toast.LENGTH_LONG).show();
}
public void execute(String method, String name, String username, String password, int age, String email) {
}
}