我的应用程序未将数据发布到Android上的MySQL数据库

Question

My App can't post data to a MySQL database on Android.

The App is not responding because I add this line of code.

//StrictMode.ThreadPolicy policy = new            StrictMode.ThreadPolicy.Builder().permitAll().build();
//StrictMode.setThreadPolicy(policy);

It crashes without this line of code.

Here's my code.

MainActivity.java

package com.example.testingtesting;

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

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.annotation.SuppressLint;
import android.os.Bundle;
import android.os.StrictMode;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends ActionBarActivity {
    EditText et1,et2,et3;
    Button b;
    InputStream is = null;
    @SuppressLint("NewApi")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
        StrictMode.setThreadPolicy(policy);
        setContentView(R.layout.activity_main);

        et1 = (EditText)findViewById(R.id.editText1);
        et2 = (EditText)findViewById(R.id.editText2);
        et3 = (EditText)findViewById(R.id.editText3);
        b = (Button)findViewById(R.id.button1);
        b.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                String name = "" +et1.getText().toString();
                String age = "" +et2.getText().toString();
                String email = "" +et3.getText().toString();

                List<NameValuePair> list = new ArrayList<NameValuePair>();

                list.add(new BasicNameValuePair("name", name));
                list.add(new BasicNameValuePair("age", age));
                list.add(new BasicNameValuePair("email", email));

                try{
                    HttpClient httpClient = new DefaultHttpClient();
                    HttpPost httpPost = new HttpPost("http://10.0.2.2/testing.php");
                    httpPost.setEntity(new UrlEncodedFormEntity(list));
                    HttpResponse response = httpClient.execute(httpPost);
                    HttpEntity entity = response.getEntity();

                    is = entity.getContent();
                    String msg = "Data Entered Succesfully";
                    Toast.makeText(getApplicationContext(), msg, Toast.LENGTH_SHORT).show();
                }catch(ClientProtocolException e){
                    Log.e("ClientProtocol", "Log_tag");
                }catch(IOException e){
                    Log.e("Log_tag", "IOException");
                    e.printStackTrace();
                }
            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

activity_main.xml

<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="com.example.testingtesting.MainActivity" >

    <EditText
        android:id="@+id/editText1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="31dp"
        android:hint="Name"
        android:ems="10" >

        <requestFocus />
    </EditText>

    <EditText
        android:id="@+id/editText2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/editText1"
        android:layout_below="@+id/editText1"
        android:layout_marginTop="63dp"
        android:hint="Age"
        android:ems="10" />

    <EditText
        android:id="@+id/editText3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/editText2"
        android:layout_below="@+id/editText2"
        android:layout_marginTop="73dp"
        android:hint="Address"
        android:ems="10" />

    <Button
        android:id="@+id/button1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/editText3"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="42dp"
        android:text="Submit" />

</RelativeLayout>

Manifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.testingtesting"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="21" />
    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

testing.php

<?php
$con = mysql_connect('localhost', 'root', '');
mysql_select_db("newdb", $con);

$name = $_POST['name'];
$age = $_POST['age'];
$email = $_POST['email'];

mysql_query("insert into mytable(name, age, email) values('{$name}','{$age}','{$email}')");
//mysql_close();
?>

LogCat without

StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);

09-15 09:51:04.629: D/dalvikvm(870): Not late-enabling CheckJNI (already on)
09-15 09:51:05.628: E/Trace(870): error opening trace file: No such file or directory (2)
09-15 09:51:06.998: D/gralloc_goldfish(870): Emulator without GPU emulation detected.
09-15 09:51:07.098: D/dalvikvm(870): GC_CONCURRENT freed 137K, 4% free 4352K/4516K, paused 5ms+3ms, total 198ms
09-15 09:53:27.838: I/Choreographer(870): Skipped 39 frames!  The application may be doing too much work on its main thread.
09-15 09:53:37.089: I/Choreographer(870): Skipped 32 frames!  The application may be doing too much work on its main thread.
09-15 09:53:38.789: D/AndroidRuntime(870): Shutting down VM
09-15 09:53:38.789: W/dalvikvm(870): threadid=1: thread exiting with uncaught exception (group=0x2bd39930)
09-15 09:53:38.828: E/AndroidRuntime(870): FATAL EXCEPTION: main
09-15 09:53:38.828: E/AndroidRuntime(870): android.os.NetworkOnMainThreadException
09-15 09:53:38.828: E/AndroidRuntime(870):  at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)
09-15 09:53:38.828: E/AndroidRuntime(870):  at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84)
09-15 09:53:38.828: E/AndroidRuntime(870):  at libcore.io.IoBridge.connectErrno(IoBridge.java:127)
09-15 09:53:38.828: E/AndroidRuntime(870):  at libcore.io.IoBridge.connect(IoBridge.java:112)
09-15 09:53:38.828: E/AndroidRuntime(870):  at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
09-15 09:53:38.828: E/AndroidRuntime(870):  at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)
09-15 09:53:38.828: E/AndroidRuntime(870):  at java.net.Socket.connect(Socket.java:842)
09-15 09:53:38.828: E/AndroidRuntime(870):  at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119)
09-15 09:53:38.828: E/AndroidRuntime(870):  at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:144)
09-15 09:53:38.828: E/AndroidRuntime(870):  at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
09-15 09:53:38.828: E/AndroidRuntime(870):  at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
09-15 09:53:38.828: E/AndroidRuntime(870):  at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
09-15 09:53:38.828: E/AndroidRuntime(870):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
09-15 09:53:38.828: E/AndroidRuntime(870):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
09-15 09:53:38.828: E/AndroidRuntime(870):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
09-15 09:53:38.828: E/AndroidRuntime(870):  at com.example.testingtesting.MainActivity$1.onClick(MainActivity.java:65)
09-15 09:53:38.828: E/AndroidRuntime(870):  at android.view.View.performClick(View.java:4202)
09-15 09:53:38.828: E/AndroidRuntime(870):  at android.view.View$PerformClick.run(View.java:17340)
09-15 09:53:38.828: E/AndroidRuntime(870):  at android.os.Handler.handleCallback(Handler.java:725)
09-15 09:53:38.828: E/AndroidRuntime(870):  at android.os.Handler.dispatchMessage(Handler.java:92)
09-15 09:53:38.828: E/AndroidRuntime(870):  at android.os.Looper.loop(Looper.java:137)
09-15 09:53:38.828: E/AndroidRuntime(870):  at android.app.ActivityThread.main(ActivityThread.java:5039)
09-15 09:53:38.828: E/AndroidRuntime(870):  at java.lang.reflect.Method.invokeNative(Native Method)
09-15 09:53:38.828: E/AndroidRuntime(870):  at java.lang.reflect.Method.invoke(Method.java:511)
09-15 09:53:38.828: E/AndroidRuntime(870):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
09-15 09:53:38.828: E/AndroidRuntime(870):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
09-15 09:53:38.828: E/AndroidRuntime(870):  at dalvik.system.NativeStart.main(Native Method)

Answer 1

尝试浏览JSON，在php中使用json_encode，以及尝试使用AsyncTask或更好地迁移至Google Android Volley库，以保持最新/最快的可靠网络调用。

Answer 2

use Asynctask for network calls. you won't be able to do any network task if your targetsdkversion is greater than 10. you must strictly use asynctask for android 3.x or after that.

and you still want to run this app than lower your android:targetSdkVersion to 10 or 9 than i might think it will work. but i suggest you to switch over asynctask.

for more visit : http://aiyazparmar.blogspot.in/2014/04/how-to-post-http-request-to-server-in.html