我在android中完全是菜鸟！ 但我试图找出如何连接Android与MySql数据库。 我发现的方法是对连接到数据库的php文件执行Http请求。但当我做一个httpPost请求时，应用程序崩溃！ （不幸的是，应用......已经停止了！）
这是我的方法代码：
public void makeHTTPRequest(View v) {
HttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost("http://www.babyschuh.de/malte/androidApp/getAllDaten.php"); //URL eintragen!!!
List<NameValuePair> nameValuePair = new ArrayList<NameValuePair>(2);
nameValuePair.add(new BasicNameValuePair("name", "Malte Schlichting"));
nameValuePair.add(new BasicNameValuePair("raum", "12"));
// Encoding the POST parameters
try {
httpPost.setEntity(new UrlEncodedFormEntity(nameValuePair));
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
// Making fHTTP Request
try {
HttpResponse response = httpClient.execute(httpPost);
Log.d("Http Response", response.toString());
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch ( IOException e) {
e.printStackTrace();
}
}
和logcat：
11-25 15:51:09.021 10114-10114/? D/dalvikvm﹕ Not late-enabling CheckJNI (already on)
11-25 15:51:10.412 10114-10114/com.malte.httprequests E/Trace﹕ error opening trace file: No such file or directory (2)
11-25 15:51:10.751 10114-10114/com.malte.httprequests W/dalvikvm﹕ VFY: unable to find class referenced in signature (Landroid/view/SearchEvent;)
11-25 15:51:10.762 10114-10114/com.malte.httprequests I/dalvikvm﹕ Could not find method android.view.Window$Callback.onSearchRequested, referenced from method android.support.v7.internal.view.WindowCallbackWrapper.onSearchRequested
11-25 15:51:10.762 10114-10114/com.malte.httprequests W/dalvikvm﹕ VFY: unable to resolve interface method 14064: Landroid/view/Window$Callback;.onSearchRequested (Landroid/view/SearchEvent;)Z
11-25 15:51:10.781 10114-10114/com.malte.httprequests D/dalvikvm﹕ VFY: replacing opcode 0x72 at 0x0002
11-25 15:51:10.781 10114-10114/com.malte.httprequests I/dalvikvm﹕ Could not find method android.view.Window$Callback.onWindowStartingActionMode, referenced from method android.support.v7.internal.view.WindowCallbackWrapper.onWindowStartingActionMode
11-25 15:51:10.791 10114-10114/com.malte.httprequests W/dalvikvm﹕ VFY: unable to resolve interface method 14068: Landroid/view/Window$Callback;.onWindowStartingActionMode (Landroid/view/ActionMode$Callback;I)Landroid/view/ActionMode;
11-25 15:51:10.791 10114-10114/com.malte.httprequests D/dalvikvm﹕ VFY: replacing opcode 0x72 at 0x0002
11-25 15:51:11.131 10114-10114/com.malte.httprequests I/dalvikvm﹕ Could not find method android.view.ViewGroup.onRtlPropertiesChanged, referenced from method android.support.v7.widget.Toolbar.onRtlPropertiesChanged
11-25 15:51:11.131 10114-10114/com.malte.httprequests W/dalvikvm﹕ VFY: unable to resolve virtual method 13965: Landroid/view/ViewGroup;.onRtlPropertiesChanged (I)V
11-25 15:51:11.131 10114-10114/com.malte.httprequests D/dalvikvm﹕ VFY: replacing opcode 0x6f at 0x0007
11-25 15:51:11.151 10114-10114/com.malte.httprequests I/dalvikvm﹕ Could not find method android.content.res.TypedArray.getChangingConfigurations, referenced from method android.support.v7.internal.widget.TintTypedArray.getChangingConfigurations
11-25 15:51:11.161 10114-10114/com.malte.httprequests W/dalvikvm﹕ VFY: unable to resolve virtual method 408: Landroid/content/res/TypedArray;.getChangingConfigurations ()I
11-25 15:51:11.171 10114-10114/com.malte.httprequests D/dalvikvm﹕ VFY: replacing opcode 0x6e at 0x0002
11-25 15:51:11.171 10114-10114/com.malte.httprequests I/dalvikvm﹕ Could not find method android.content.res.TypedArray.getType, referenced from method android.support.v7.internal.widget.TintTypedArray.getType
11-25 15:51:11.171 10114-10114/com.malte.httprequests W/dalvikvm﹕ VFY: unable to resolve virtual method 430: Landroid/content/res/TypedArray;.getType (I)I
11-25 15:51:11.181 10114-10114/com.malte.httprequests D/dalvikvm﹕ VFY: replacing opcode 0x6e at 0x0002
11-25 15:51:11.311 10114-10118/com.malte.httprequests D/dalvikvm﹕ GC_CONCURRENT freed 214K, 2% free 18950K/19271K, paused 43ms+6ms, total 111ms
11-25 15:51:11.311 10114-10114/com.malte.httprequests D/dalvikvm﹕ WAIT_FOR_CONCURRENT_GC blocked 17ms
11-25 15:51:11.461 10114-10114/com.malte.httprequests D/libEGL﹕ loaded /system/lib/egl/libEGL_emulation.so
11-25 15:51:11.461 10114-10114/com.malte.httprequests D/libEGL﹕ loaded /system/lib/egl/libGLESv1_CM_emulation.so
11-25 15:51:11.481 10114-10114/com.malte.httprequests D/libEGL﹕ loaded /system/lib/egl/libGLESv2_emulation.so
11-25 15:51:11.492 10114-10114/com.malte.httprequests D/﹕ HostConnection::get() New Host Connection established 0x2a080d78, tid 10114
11-25 15:51:11.551 10114-10114/com.malte.httprequests W/EGL_emulation﹕ eglSurfaceAttrib not implemented
11-25 15:51:11.581 10114-10114/com.malte.httprequests D/OpenGLRenderer﹕ Enabling debug mode 0
11-25 15:51:15.222 10114-10114/com.malte.httprequests D/AndroidRuntime﹕ Shutting down VM
11-25 15:51:15.222 10114-10114/com.malte.httprequests W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0x40a122a0)
11-25 15:51:15.262 10114-10114/com.malte.httprequests E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.IllegalStateException: Could not execute method of the activity
at android.view.View$1.onClick(View.java:3591)
at android.view.View.performClick(View.java:4084)
at android.view.View$PerformClick.run(View.java:16966)
at android.os.Handler.handleCallback(Handler.java:615)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4745)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at android.view.View$1.onClick(View.java:3586)
at android.view.View.performClick(View.java:4084)
at android.view.View$PerformClick.run(View.java:16966)
at android.os.Handler.handleCallback(Handler.java:615)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4745)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.os.NetworkOnMainThreadException
at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)
at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
at java.net.InetAddress.getAllByName(InetAddress.java:214)
at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
at com.malte.httprequests.MainActivity.makeHTTPRequest(MainActivity.java:48)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at android.view.View$1.onClick(View.java:3586)
at android.view.View.performClick(View.java:4084)
at android.view.View$PerformClick.run(View.java:16966)
at android.os.Handler.handleCallback(Handler.java:615)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4745)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
11-25 15:51:20.231 10114-10114/com.malte.httprequests I/Process﹕ Sending signal. PID: 10114 SIG: 9
我只是不知道该怎么办!! ：/ 但是当我使用Volley类提出获取JSONArray的请求时，一切正常。
所以我的问题是： 为什么上面的例子不起作用？ 如果有一种更简单的方法将android连接到mysql数据库？
PS：-min。 android SDK：16 -Adroid Studio 1.3.2 - 是的，我插入了互联网许可
PPS：我尝试了不同的示例应用，但没有任何效果。
答案 0 :(得分：0)
创建Asynctask：
private class NetworkTask extends AsyncTask<Void, Void, Void>{
@Override
protected Void doInBackground(Void... arg0) {
HttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost("http://www.babyschuh.de/malte/androidApp/getAllDaten.php"); //URL eintragen!!!
List<NameValuePair> nameValuePair = new ArrayList<NameValuePair>(2);
nameValuePair.add(new BasicNameValuePair("name", "Malte Schlichting"));
nameValuePair.add(new BasicNameValuePair("raum", "12"));
// Encoding the POST parameters
try {
httpPost.setEntity(new UrlEncodedFormEntity(nameValuePair));
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
// Making fHTTP Request
try {
HttpResponse response = httpClient.execute(httpPost);
Log.d("Http Response", response.toString());
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch ( IOException e) {
e.printStackTrace();
}
}
}
通过调用
启动此任务new NetworkTask().execute();
You Exception意味着您不允许在主线程上执行任何与网络相关的操作。原因是，如果您在主线程上执行这些操作，则当您的应用与服务器通信时，您的UI不会响应。