java - Android Studio 方法 gettext 必须从 ui 线程调用，当前推断线程是工作线程

Question

我正在尝试为应用程序创建一个表单。该表单包含两个编辑文本字段和一个提交按钮。无论如何，我在 doInBackground() 下收到“必须从 ui 线程调用方法 getText”错误。

这是我的代码:

package com.example.jinson.myapplication;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
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 android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.view.View;
import android.support.design.widget.NavigationView;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.EditText;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class SubmitUname extends AppCompatActivity {

 private EditText editTextName;
 private EditText editTextUname;

@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.submit_uname);

 editTextName = (EditText) findViewById(R.id.editName);
 editTextUname = (EditText) findViewById(R.id.editUserName);


 Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
 setSupportActionBar(toolbar);
 DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
 ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
         this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
 drawer.setDrawerListener(toggle);
 toggle.syncState();
}

 public void insert(View view){
  String name = editTextName.getText().toString();
  String uname = editTextUname.getText().toString();
  insertToDatabase(name,uname);
 }

 private void insertToDatabase(String name, String uname){
  class SendPostReqAsyncTask extends AsyncTask<String, Void, String> {
   @Override
   protected String doInBackground(String... params) {

     String paramUsername = params[0];
     String paramAddress = params[1];


       String name = editTextName.getText().toString();
       String uname = editTextUname.getText().toString();

     List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
     nameValuePairs.add(new BasicNameValuePair("name", name));
     nameValuePairs.add(new BasicNameValuePair("uname", uname));

     try {
      HttpClient httpClient = new DefaultHttpClient();
      HttpPost httpPost = new HttpPost(
              "http://localhost/insert-db.php");
      httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

      HttpResponse response = httpClient.execute(httpPost);

      HttpEntity entity = response.getEntity();


     } catch (ClientProtocolException e) {

     } catch (IOException e) {

     }

   return "success";
   }

   @Override
   protected void onPostExecute(String result) {
   super.onPostExecute(result);
   }
  }
 SendPostReqAsyncTask sendPostReqAsyncTask = new SendPostReqAsyncTask();
  sendPostReqAsyncTask.execute(name, uname);
  }

}

Android studio 表示必须按照以下说明从 UI 线程调用 getText() 方法:editTextName.getText().toString();和 editTextUname.getText().toString();可能的解决方案？？

我是这个领域的新手，请给我一个解决方案。

Answer 1

Android studio says that method getText() must be called from the UI Thread

正确。如果用户旋转屏幕或以其他方式触发配置更改，则当您从 doInBackground() 调用该代码时，您的 Activity 可能会消失。

Possible solutions?

• 向 SendPostReqAsyncTask 添加一个构造函数，并将所需的任何值传入其中，例如 EditText 中的文本

• 向 SendPostReqAsyncTask 添加 setter ，并在调用 execute( ) 或 executeOnExecutor()

另请注意:

• HttpClient 多年来一直不被推荐，在 Android 5.1 中已弃用，并在 Android 6.0 中从 SDK 中删除

• 使用 AsyncTask 的嵌套类实现(正如您使用 SendPostReqAsyncTask 所做的那样)将在设备发生配置更改(例如，更改配置)时导致内存泄漏。 ，用户将设备从纵向旋转为横向)