Android向/從PHP發送和接收數據

Question

我正在嘗試將數據發送到php文件，並獲得對我的android活動的響應。

我正在使用它來將參數發送到php並從中接收：

    String name = "snake", price = "10", description = "nada nada nada";

    List<NameValuePair> params = new ArrayList<NameValuePair>();
    params.add(new BasicNameValuePair("name", name));
    params.add(new BasicNameValuePair("price", price));
    params.add(new BasicNameValuePair("description", description));

    // Create a new HttpClient and Post Header
    HttpClient httpclient = new DefaultHttpClient();
    HttpPost httppost = new HttpPost("http://192.168.1.122/example/example.php");

    // This is the data to send

    try {
        httppost.setEntity(new UrlEncodedFormEntity(params));

        // Execute HTTP Post Request

        ResponseHandler<String> responseHandler = new BasicResponseHandler();
        String response = httpclient.execute(httppost, responseHandler);

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

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

和我的PHP文件是這樣的：

<?php

//code to reverse the string

$reversed = strrev($_POST["action"]);

echo $reversed;

?>

我認為問題是當我嘗試從php文件接收數據時。 因為當我使用調試模式時，它進入String response = httpclient.execute(httppost, responseHandler); 是我得到例外的時候。

logcat的：

06-20 10:19:39.173: E/AndroidRuntime(3580): FATAL EXCEPTION: main
06-20 10:19:39.173: E/AndroidRuntime(3580): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.login/com.example.plataformavideos.GraficosLinhas}: android.os.NetworkOnMainThreadException
06-20 10:19:39.173: E/AndroidRuntime(3580):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
06-20 10:19:39.173: E/AndroidRuntime(3580):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
06-20 10:19:39.173: E/AndroidRuntime(3580):     at android.app.ActivityThread.access$600(ActivityThread.java:141)
06-20 10:19:39.173: E/AndroidRuntime(3580):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
06-20 10:19:39.173: E/AndroidRuntime(3580):     at android.os.Handler.dispatchMessage(Handler.java:99)
06-20 10:19:39.173: E/AndroidRuntime(3580):     at android.os.Looper.loop(Looper.java:137)
06-20 10:19:39.173: E/AndroidRuntime(3580):     at android.app.ActivityThread.main(ActivityThread.java:5041)
06-20 10:19:39.173: E/AndroidRuntime(3580):     at java.lang.reflect.Method.invokeNative(Native Method)
06-20 10:19:39.173: E/AndroidRuntime(3580):     at java.lang.reflect.Method.invoke(Method.java:511)
06-20 10:19:39.173: E/AndroidRuntime(3580):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
06-20 10:19:39.173: E/AndroidRuntime(3580):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
06-20 10:19:39.173: E/AndroidRuntime(3580):     at dalvik.system.NativeStart.main(Native Method)
06-20 10:19:39.173: E/AndroidRuntime(3580): Caused by: android.os.NetworkOnMainThreadException
06-20 10:19:39.173: E/AndroidRuntime(3580):     at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)
06-20 10:19:39.173: E/AndroidRuntime(3580):     at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84)
06-20 10:19:39.173: E/AndroidRuntime(3580):     at libcore.io.IoBridge.connectErrno(IoBridge.java:127)
06-20 10:19:39.173: E/AndroidRuntime(3580):     at libcore.io.IoBridge.connect(IoBridge.java:112)
06-20 10:19:39.173: E/AndroidRuntime(3580):     at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
06-20 10:19:39.173: E/AndroidRuntime(3580):     at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)
06-20 10:19:39.173: E/AndroidRuntime(3580):     at java.net.Socket.connect(Socket.java:842)
06-20 10:19:39.173: E/AndroidRuntime(3580):     at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119)
06-20 10:19:39.173: E/AndroidRuntime(3580):     at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:144)
06-20 10:19:39.173: E/AndroidRuntime(3580):     at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
06-20 10:19:39.173: E/AndroidRuntime(3580):     at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
06-20 10:19:39.173: E/AndroidRuntime(3580):     at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
06-20 10:19:39.173: E/AndroidRuntime(3580):     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
06-20 10:19:39.173: E/AndroidRuntime(3580):     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:653)
06-20 10:19:39.173: E/AndroidRuntime(3580):     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:627)
06-20 10:19:39.173: E/AndroidRuntime(3580):     at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:616)
06-20 10:19:39.173: E/AndroidRuntime(3580):     at com.example.plataformavideos.GraficosLinhas.postData(GraficosLinhas.java:91)
06-20 10:19:39.173: E/AndroidRuntime(3580):     at com.example.plataformavideos.GraficosLinhas.onCreate(GraficosLinhas.java:70)
06-20 10:19:39.173: E/AndroidRuntime(3580):     at android.app.Activity.performCreate(Activity.java:5104)
06-20 10:19:39.173: E/AndroidRuntime(3580):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
06-20 10:19:39.173: E/AndroidRuntime(3580):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
06-20 10:19:39.173: E/AndroidRuntime(3580):     ... 11 more

Answer 1

首先檢查您的設備是否可以連接到本地網絡

NetworkOnMainThreadException

當應用程序嘗試在其主線程上執行聯網操作時引發的異常。

http://developer.android.com/reference/android/os/NetworkOnMainThreadException.html

首選使用AsynkTask進行網絡操作 ...

編輯

您需要對代碼進行一些更改。......將代碼放入ASYNKTASK

http://developer.android.com/reference/android/os/AsyncTask.html

改變這個

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

這個

List<NameValuePair> params = new ArrayList<NameValuePair>(3);

並且您正在將變量傳遞到您的PHP服務器（名稱，價格，描述），請確保您的PHP代碼文件中包含3個變量