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我正在尝试从我的 Android 应用程序发送数据并根据输入接收输出。但是，只要我单击按钮，应用程序就会关闭。这是我在android中的java文件代码：

package com.example.diary;


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

import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.BasicResponseHandler;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;

import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ProgressBar;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener
{
    private EditText value;
    private Button btn;
    private ProgressBar pb;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        value=(EditText)findViewById(R.id.editText1);
        btn=(Button)findViewById(R.id.button1);
        pb=(ProgressBar)findViewById(R.id.progressBar1);
        pb.setVisibility(View.GONE);
        btn.setOnClickListener(this);
    }
    @Override
    public void onClick(View arg0) {
        // TODO Auto-generated method stub
                    if(value.getText().toString().length()<1){

                        // out of range
                        Toast.makeText(this, "please enter something", Toast.LENGTH_LONG).show();
                    }else{
                        pb.setVisibility(View.VISIBLE);
                        new MyAsyncTask().execute(value.getText().toString());      
                    }

    }
    private class MyAsyncTask extends AsyncTask<String, Integer, Double>{

        @Override
        protected Double doInBackground(String... params) {
            // TODO Auto-generated method stub
            postData(params[0]);
            return null;
        }

        protected void onPostExecute(Double result){
            pb.setVisibility(View.GONE);
            Toast.makeText(getApplicationContext(), "Code Sent", Toast.LENGTH_LONG).show();
        }
        protected void onProgressUpdate(Integer... progress){
            pb.setProgress(progress[0]);
        }
        public void postData(String valueIWantToSend) {

            HttpClient httpclient = new DefaultHttpClient();
            HttpPost httppost = new HttpPost("http://10.0.2.2/remoteaccess/index.php");
            //HttpPost httppost = new HttpPost("http://192.168.1.13/educlinic/Widget/AndroidApp");
            try {

                // Add your data
                List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
                nameValuePairs.add(new BasicNameValuePair("myHttpData", valueIWantToSend));
                httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
                ResponseHandler<String> responseHandler = new BasicResponseHandler();
                String response = httpclient.execute(httppost, responseHandler);

                //This is the response from a php application
                String reverseString = response;
                Toast.makeText(getApplicationContext(), "response" + reverseString, Toast.LENGTH_LONG).show();

                } catch (ClientProtocolException e) {
                Toast.makeText(getApplicationContext(), "CPE response " + e.toString(), Toast.LENGTH_LONG).show();
                // TODO Auto-generated catch block
                } catch (IOException e) {
                Toast.makeText(getApplicationContext(), "IOE response " + e.toString(), Toast.LENGTH_LONG).show();
                // TODO Auto-generated catch block
                }
        }

}}

这是xml文件的代码：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" 
        android:id="@+id/text1"/>

    <EditText
        android:id="@+id/editText1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/text1"
        android:layout_below="@+id/text1"
        android:layout_marginLeft="21dp"
        android:layout_marginTop="22dp"
        android:ems="10" >

        <requestFocus />
    </EditText>

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/editText1"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="59dp"
        android:text="Button" />

    <ProgressBar
        android:id="@+id/progressBar1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/button1"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="44dp" />

</RelativeLayout>

这是针对 php 的：

<?php
$data = $_POST['myHttpData'];
 echo $data;
?>

提前致谢。

4

1 回答 1

1

很可能您会收到以下错误：

RuntimeException：无法在未调用 Looper.prepare() 的线程内创建处理程序

在postData您尝试显示 Toast 的方法内部。但是您正在postData 从非 UI 线程调用方法（来自 AsyncTask 的 doInBackground 方法）。

postData只需从方法中删除 Toast或用于onPostExecute访问或更新 UI 元素

于 2013-03-15T06:38:40.883 回答