Android Studio,应用程序停止工作
我是安卓工作室的新手。 我关注Youtube和Google错误的教程,但这次我似乎找不到如何解决这个问题 我正在创建一个简单的登录和注册应用程序,它使用mysql数据库。当我启动应用程序并点击注册按钮时,应用程序关闭并声明:“应用程序停止工作” 我查看了日志,发现:Android Studio,应用程序停止工作,android,mysql,Android,Mysql,我是安卓工作室的新手。 我关注Youtube和Google错误的教程,但这次我似乎找不到如何解决这个问题 我正在创建一个简单的登录和注册应用程序,它使用mysql数据库。当我启动应用程序并点击注册按钮时,应用程序关闭并声明:“应用程序停止工作” 我查看了日志,发现: 09-13 17:23:19.607 2229-2236/com.example.appname.appname E/art﹕ Failed sending reply to debugger: Broken pipe 09-
09-13 17:23:19.607 2229-2236/com.example.appname.appname E/art﹕ Failed sending reply to debugger: Broken pipe
09-13 17:23:47.756 2229-2229/com.example.appname.appname E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.example.appname.appname, PID: 2229
java.lang.IllegalStateException: Could not find method userReg(View) in a parent or ancestor Context for android:onClick attribute defined on view class android.widget.Button
at android.view.View$DeclaredOnClickListener.resolveMethod(View.java:4479)
at android.view.View$DeclaredOnClickListener.onClick(View.java:4443)
at android.view.View.performClick(View.java:5198)
at android.view.View$PerformClick.run(View.java:21147)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Mainactivity.java
import android.app.Activity;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void userReg()
{
startActivity(new Intent(this, Register.class));
}
public void userLogin(View view)
{
}
}
Register.java
import android.app.Activity;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.EditText;
public class Register extends Activity {
EditText ET_NAME,ET_USER_NAME,ET_USER_PASS;
String name,user_name,user_pass;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.register_layout);
ET_NAME = (EditText) findViewById(R.id.name);
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)
{
name = 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,name,user_name,user_pass);
finish();
}
}
Backgroundtask.java
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.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
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://10.0.2.2.2/webapp/register.php";
String login_url = "http://10.0.2.2.2/webapp/login.php";
String method = params[0];
if(method.equals("register"))
{
String name = 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);
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("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();
return "Registration Success..";
} 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) {
Toast.makeText(ctx,result,Toast.LENGTH_LONG).show();
}
}
导入android.content.Context;
导入android.os.AsyncTask;
导入android.widget.Toast;
导入java.io.BufferedWriter;
导入java.io.IOException;
导入java.io.InputStream;
导入java.io.OutputStream;
导入java.io.OutputStreamWriter;
导入java.net.HttpURLConnection;
导入java.net.MalformedURLException;
导入java.net.URL;
导入java.net.urlcoder;
公共类BackgroundTask扩展了AsyncTask{
上下文ctx;
背景任务(上下文ctx)
{
这个.ctx=ctx;
}
@凌驾
受保护的void onPreExecute(){
super.onPreExecute();
}
@凌驾
受保护的字符串doInBackground(字符串…参数){
字符串注册表url=”http://10.0.2.2.2/webapp/register.php";
字符串登录\u url=”http://10.0.2.2.2/webapp/login.php";
字符串方法=参数[0];
if(方法等于(“寄存器”))
{
字符串名称=参数[1];
字符串user_name=params[2];
字符串user_pass=params[3];
试一试{
URL=新URL(注册URL);
HttpURLConnection HttpURLConnection=(HttpURLConnection)url.openConnection();
httpURLConnection.setRequestMethod(“POST”);
httpURLConnection.setDoOutput(true);
OutputStream OS=httpURLConnection.getOutputStream();
BufferedWriter BufferedWriter=新的BufferedWriter(新的OutputStreamWriter(OS,“UTF-8”));
字符串数据=urlcoder.encode(“用户”、“UTF-8”)+“=”+urlcoder.encode(名称,“UTF-8”)+“&”+
URLEncoder.encode(“用户名”,“UTF-8”)+”=“+URLEncoder.encode(用户名,“UTF-8”)+”&”+
urlcoder.encode(“用户密码”,“UTF-8”)+“=”+urlcoder.encode(用户密码,“UTF-8”);
bufferedWriter.write(数据);
bufferedWriter.flush();
bufferedWriter.close();
OS.close();
InputStream=httpURLConnection.getInputStream();
IS.close();
返回“注册成功…”;
}捕获(格式错误){
e、 printStackTrace();
}捕获(IOE异常){
e、 printStackTrace();
}
}
返回null;
}
@凌驾
受保护的void onProgressUpdate(void…值){
super.onProgressUpdate(值);
}
@凌驾
受保护的void onPostExecute(字符串结果){
Toast.makeText(ctx,result,Toast.LENGTH_LONG).show();
}
}
更改您的Mainactivity.java
public void userReg()
{
startActivity(new Intent(this, Register.class));
}
public void userReg(View view)
{
name = 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,name,user_name,user_pass);
finish();
}
到
在Register.java中
public void userReg()
{
startActivity(new Intent(this, Register.class));
}
public void userReg(View view)
{
name = 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,name,user_name,user_pass);
finish();
}
到
更改您的Mainactivity.java
public void userReg()
{
startActivity(new Intent(this, Register.class));
}
public void userReg(View view)
{
name = 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,name,user_name,user_pass);
finish();
}
到
在Register.java中
public void userReg()
{
startActivity(new Intent(this, Register.class));
}
public void userReg(View view)
{
name = 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,name,user_name,user_pass);
finish();
}
到
出现错误是因为应用程序找不到在xml中按钮的onClick属性中编写的userReg(View)方法。您需要在方法中添加参数“View”。只需修复以下代码行:
MainActivity.java
public void userReg() {
startActivity(new Intent(this, Register.class));
}
到
出现错误是因为应用程序找不到在xml中按钮的onClick属性中编写的userReg(View)方法。您需要在方法中添加参数“View”。只需修复以下代码行:
MainActivity.java
public void userReg() {
startActivity(new Intent(this, Register.class));
}
到
然后呢?这是一个更安全的选择,因为他可以避免问题,如果他将来想让听众从中受益的话?这是一个更安全的选择,因为他可以避免问题,如果他将来想让听众从中受益的话。