Java 错误:必须从UI线程调用getText
我正在尝试将姓名、电话和电子邮件输入mysql数据库。我在doInBackground方法中遇到一个错误,需要从ui线程调用getText 这是我的用户详细信息文件:Java 错误:必须从UI线程调用getText,java,android,json,listview,Java,Android,Json,Listview,我正在尝试将姓名、电话和电子邮件输入mysql数据库。我在doInBackground方法中遇到一个错误,需要从ui线程调用getText 这是我的用户详细信息文件: import java.util.ArrayList; import java.util.List; import org.apache.http.NameValuePair; import org.apache.http.message.BasicNameValuePair; import org.json.JSONExcep
import java.util.ArrayList;
import java.util.List;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class UserDetails extends Activity {
// Progress Dialog
private ProgressDialog pDialog;
JSONParser1 jsonParser = new JSONParser1();
EditText inputName;
EditText inputPhone;
EditText inputEmail;
// url to create new product
private static String url_create_product = "http://bookit.net16.net//book.php";
// JSON Node names
private static final String TAG_SUCCESS = "success";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.content_user_details);
// Edit Text
inputName = (EditText) findViewById(R.id.inputName);
inputPhone = (EditText) findViewById(R.id.inputPhone);
inputEmail = (EditText) findViewById(R.id.inputEmail);
// Create button
Button btnCreateProduct = (Button) findViewById(R.id.proceed);
// button click event
btnCreateProduct.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
// creating new product in background thread
new CreateNewProduct().execute();
}
});
}
/**
* Background Async Task to Create new product
* */
class CreateNewProduct extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(UserDetails.this);
pDialog.setMessage("Creating Product..");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
/**
* Creating product
* */
protected String doInBackground(String... args) {
String name = inputName.getText().toString();
String phone = inputPhone.getText().toString();
String email = inputEmail.getText().toString();
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("name", name));
params.add(new BasicNameValuePair("phone", phone));
params.add(new BasicNameValuePair("email", email));
// getting JSON Object
// Note that create product url accepts POST method
JSONObject json = JSONParser1.makeHttpRequest(url_create_product,
"POST", params);
// check log cat fro response
Log.d("Create Response", json.toString());
// check for success tag
try {
int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// successfully created product
// closing this screen
finish();
} else {
// failed to create product
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog once done
pDialog.dismiss();
}
}
import java.util.ArrayList;
导入java.util.List;
导入org.apache.http.NameValuePair;
导入org.apache.http.message.BasicNameValuePair;
导入org.json.JSONException;
导入org.json.JSONObject;
导入android.app.Activity;
导入android.app.ProgressDialog;
导入android.content.Intent;
导入android.os.AsyncTask;
导入android.os.Bundle;
导入android.util.Log;
导入android.view.view;
导入android.widget.Button;
导入android.widget.EditText;
公共类UserDetails扩展活动{
//进度对话框
私人对话;
JSONParser1 jsonParser=新的JSONParser1();
编辑文本输入名;
编辑文本输入电话;
编辑文本输入电子邮件;
//创建新产品的url
私有静态字符串url\u创建\u产品=”http://bookit.net16.net//book.php";
//JSON节点名称
私有静态最终字符串标记_SUCCESS=“SUCCESS”;
@凌驾
创建时的公共void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.content\u user\u详细信息);
//编辑文本
inputName=(EditText)findViewById(R.id.inputName);
inputPhone=(EditText)findViewById(R.id.inputPhone);
inputEmail=(EditText)findViewById(R.id.inputEmail);
//创建按钮
按钮btnCreateProduct=(按钮)findViewById(R.id.procedure);
//按钮点击事件
btnCreateProduct.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图){
//在后台线程中创建新产品
新建CreateNewProduct().execute();
}
});
}
/**
*创建新产品的后台异步任务
* */
类CreateNewProduct扩展了AsyncTask{
/**
*在启动后台线程显示进度对话框之前
* */
@凌驾
受保护的void onPreExecute(){
super.onPreExecute();
pDialog=newprogressdialog(UserDetails.this);
pDialog.setMessage(“创建产品…”);
pDialog.setUndeterminate(假);
pDialog.setCancelable(真);
pDialog.show();
}
/**
*创造产品
* */
受保护的字符串doInBackground(字符串…args){
字符串名称=inputName.getText().toString();
字符串phone=inputPhone.getText().toString();
字符串email=inputEmail.getText().toString();
//建筑参数
List params=new ArrayList();
参数添加(新的BasicNameValuePair(“名称”),名称);
参数添加(新的BasicNameValuePair(“电话”,电话));
参数添加(新的BasicNameValuePair(“电子邮件”),电子邮件);
//获取JSON对象
//请注意,创建产品url接受POST方法
JSONObject json=JSONParser1.makeHttpRequest(url\u create\u product,
“POST”,params);
//检查cat fro响应日志
d(“创建响应”,json.toString());
//检查成功标签
试一试{
int success=json.getInt(TAG_success);
如果(成功==1){
//已成功创建产品
//关闭此屏幕
完成();
}否则{
//未能创建产品
}
}捕获(JSONException e){
e、 printStackTrace();
}
返回null;
}
/**
*完成后台任务后,关闭“进度”对话框
* **/
受保护的void onPostExecute(字符串文件\u url){
//完成后关闭对话框
pDialog.disclose();
}
}
}对视图的任何访问都必须在UI线程上完成,而不是在另一个线程或异步任务上完成。将它们作为参数传入,而不是在doInBackground中查询它们。在onPreExecute中请求它们是完全可以的。创建一个类,扩展应用程序的类,并在其上定义一个处理程序
public class Global extends Application{
public static Handler HANDLER = new Handler();
onCreate(){
}
}
然后,关于代码使用:
Global.HANDLER.post(new Runable(){
// do anythin with UI you like
});
不要从
doInBackground
获取字符串,而是在调用异步任务并将其作为参数传递之前获取字符串
btnCreateProduct.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
// creating new product in background thread
String name = inputName.getText().toString();
String phone = inputPhone.getText().toString();
String email = inputEmail.getText().toString();
new CreateNewProduct(name,phone,email).execute();
}
});
并在异步任务中创建构造函数
class CreateNewProduct extends AsyncTask<String, String, String> {
String name, phone, email;
public CreateNewProduct(String param1, String param2, String param3) {
name= param1;
phone =param2;
email = param3;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(UserDetails.this);
pDialog.setMessage("Creating Product..");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
/**
* Creating product
* */
protected String doInBackground(String... args) {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("name", name));
params.add(new BasicNameValuePair("phone", phone));
params.add(new BasicNameValuePair("email", email));
// getting JSON Object
// Note that create product url accepts POST method
JSONObject json = JSONParser1.makeHttpRequest(url_create_product,
"POST", params);
// check log cat fro response
Log.d("Create Response", json.toString());
// check for success tag
try {
int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// successfully created product
// closing this screen
finish();
} else {
// failed to create product
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog once done
pDialog.dismiss();
}
}
class CreateNewProduct扩展了异步任务{
字符串名称、电话、电子邮件;
public CreateNewProduct(字符串param1、字符串param2、字符串param3){
name=param1;
电话=2;
email=param3;
}
@凌驾
受保护的void onPreExecute(){
super.onPreExecute();
pDialog=newprogressdialog(UserDetails.this);
pDialog.setMessage(“创建产品…”);
pDialog.setUndeterminate(假);
pDialog.setCancelable(真);
pDialog.show();
}
/**
*创造产品
* */
受保护的字符串doInBackground(字符串…args){
//建筑参数
List params=new ArrayList();
参数添加(新的BasicNameValuePair(“名称”),名称);
参数添加(新的BasicNameValuePair(“电话”,电话));
参数添加(新的BasicNameValuePair(“电子邮件”),电子邮件);
//获取JSON对象
//请注意,创建产品url接受POST方法
JSONObject json=JSONParser1.makeHttpRequest(url\u create\u product,
“POST”,params);
//检查cat fro响应日志
d(“创建响应”,json.toString());
//检查成功标签
试一试{
int success=json.getInt(TAG_success);
如果(成功==1){
//已成功创建产品
//关闭此屏幕
完成();
}否则{
//未能创建产品
}
}捕获(JSONException e){
e、 printStackTrace();
}
返回null;
}
/**
*完成后台任务后,关闭“进度”对话框
* **/
受保护的void onPostExecute(字符串fil