Android- Run a php script from java

Question

I want to run a php script located on a web server from my android app. this is the code

try {
    URL url = new URL("http://www.xxx.com/add.php");     
    URLConnection con = url.openConnection();
    con.setDoOutput(true);
    PrintStream out = new PrintStream(con.getOutputStream());
    con.getInputStream();
    System.out.print("asdad ");
    out.close();
} catch (MalformedURLException e) {
    e.printStackTrace();
} catch (IOException e) {
    e.printStackTrace();
}

This code is running well when used inside a simple java application, but it results error when used inside android app. I used the permission inside manifest:

<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

Errors:

04-22 17:10:37.421: E/AndroidRuntime(4518): FATAL EXCEPTION: main

04-22 17:10:37.421: E/AndroidRuntime(4518): java.lang.IllegalStateException: Could not execute method of the activity

04-22 17:10:37.421: E/AndroidRuntime(4518):     at android.view.View$1.onClick(View.java:3758)

04-22 17:10:37.421: E/AndroidRuntime(4518):     at android.view.View.performClick(View.java:4377)

04-22 17:10:37.421: E/AndroidRuntime(4518):     at android.view.View$PerformClick.run(View.java:18031)

04-22 17:10:37.421: E/AndroidRuntime(4518):     at android.os.Handler.handleCallback(Handler.java:725)

04-22 17:10:37.421: E/AndroidRuntime(4518):     at android.os.Handler.dispatchMessage(Handler.java:92)

04-22 17:10:37.421: E/AndroidRuntime(4518):     at android.os.Looper.loop(Looper.java:137)

04-22 17:10:37.421: E/AndroidRuntime(4518):     at 
android.app.ActivityThread.main(ActivityThread.java:5306)

04-22 17:10:37.421: E/AndroidRuntime(4518):     at java.lang.reflect.Method.invokeNative(Native Method)

04-22 17:10:37.421: E/AndroidRuntime(4518):     at java.lang.reflect.Method.invoke(Method.java:511)

04-22 17:10:37.421: E/AndroidRuntime(4518):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)

04-22 17:10:37.421: E/AndroidRuntime(4518):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)

04-22 17:10:37.421: E/AndroidRuntime(4518):     at dalvik.system.NativeStart.main(Native Method)

04-22 17:10:37.421: E/AndroidRuntime(4518): Caused by: java.lang.reflect.InvocationTargetException

04-22 17:10:37.421: E/AndroidRuntime(4518):     at java.lang.reflect.Method.invokeNative(Native Method)

04-22 17:10:37.421: E/AndroidRuntime(4518):     at java.lang.reflect.Method.invoke(Method.java:511)

04-22 17:10:37.421: E/AndroidRuntime(4518):     at android.view.View$1.onClick(View.java:3753)

04-22 17:10:37.421: E/AndroidRuntime(4518):     ... 11 more

04-22 17:10:37.421: E/AndroidRuntime(4518): Caused by: android.os.NetworkOnMainThreadException

04-22 17:10:37.421: E/AndroidRuntime(4518):     at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1128)

04-22 17:10:37.421: E/AndroidRuntime(4518):     at java.net.InetAddress.lookupHostByName(InetAddress.java:385)

04-22 17:10:37.421: E/AndroidRuntime(4518):     at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)

04-22 17:10:37.421: E/AndroidRuntime(4518):     at java.net.InetAddress.getAllByName(InetAddress.java:214)

04-22 17:10:37.421: E/AndroidRuntime(4518):     at libcore.net.http.HttpConnection.<init>(HttpConnection.java:70)

04-22 17:10:37.421: E/AndroidRuntime(4518):     at libcore.net.http.HttpConnection.<init>(HttpConnection.java:50)

04-22 17:10:37.421: E/AndroidRuntime(4518):     at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:340)

04-22 17:10:37.421: E/AndroidRuntime(4518):     at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:87)

04-22 17:10:37.421: E/AndroidRuntime(4518):     at libcore.net.http.HttpConnection.connect(HttpConnection.java:128)

04-22 17:10:37.421: E/AndroidRuntime(4518):     at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:316)

04-22 17:10:37.421: E/AndroidRuntime(4518):     at libcore.net.http.HttpEngine.connect(HttpEngine.java:311)

04-22 17:10:37.421: E/AndroidRuntime(4518):     at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:290)

04-22 17:10:37.421: E/AndroidRuntime(4518):     at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:240)

04-22 17:10:37.421: E/AndroidRuntime(4518):     at libcore.net.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:81)

04-22 17:10:37.421: E/AndroidRuntime(4518):     at libcore.net.http.HttpURLConnectionImpl.getOutputStream(HttpURLConnectionImpl.java:197)

04-22 17:10:37.421: E/AndroidRuntime(4518):     at com.example.tmapp.User.AddToDatabase(User.java:79)

04-22 17:10:37.421: E/AndroidRuntime(4518):     at com.example.tmapp.Registration.reg(Registration.java:85)

04-22 17:10:37.421: E/AndroidRuntime(4518):     ... 14 more

NetworkOnMainThreadException -- You should executed your code using an Asynctask (in this case is the right way) not in the Main thread — Marco Acierno
– Marco Acierno, Commented Apr 22, 2014 at 14:15
read this: developer.android.com/reference/android/os/AsyncTask.html @user3066678 — donfuxx
– donfuxx, Commented Apr 22, 2014 at 14:19

Gustek · Accepted Answer · 2014-04-22 14:16:28Z

1

Since Android 3.0 (Honeycomb) network connections can't be done on main thread. You have to use AsyncTask or other methods of concurrency.

Read this manual page on network connections.

answered Apr 22, 2014 at 14:16

Gustek

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