能把錯誤訊息貼出來嗎??

可能是 網路權限沒開

這是錯誤訊息:
06-01 18:57:28.505 17833-17833/? I/art: Not late-enabling -Xcheck:jni (already on)
06-01 18:57:28.506 17833-17833/? W/art: Unexpected CPU variant for X86 using defaults: x86
06-01 18:57:28.534 17833-17840/? E/art: Failed sending reply to debugger: Broken pipe
06-01 18:57:28.534 17833-17840/? I/art: Debugger is no longer active
Starting a blocking GC Instrumentation
06-01 18:57:28.851 17833-17833/? W/System: ClassLoader referenced unknown path: /data/app/com.example.wutx2.logintestv3forjdbc131-1/lib/x86
06-01 18:57:28.861 17833-17833/? I/InstantRun: starting instant run server: is main process
06-01 18:57:28.963 17833-17833/? W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable
06-01 18:57:29.168 17833-17849/? I/OpenGLRenderer: Initialized EGL, version 1.4
06-01 18:57:29.168 17833-17849/? D/OpenGLRenderer: Swap behavior 1
06-01 18:57:29.168 17833-17849/? W/OpenGLRenderer: Failed to choose config with EGL_SWAP_BEHAVIOR_PRESERVED, retrying without...
06-01 18:57:29.168 17833-17849/? D/OpenGLRenderer: Swap behavior 0
06-01 18:57:29.217 17833-17849/? D/EGL_emulation: eglCreateContext: 0xa090d660: maj 2 min 0 rcv 2
06-01 18:57:29.251 17833-17849/? D/EGL_emulation: eglMakeCurrent: 0xa090d660: ver 2 0 (tinfo 0xa08d76d0)
06-01 18:57:29.331 17833-17833/? W/art: Before Android 4.1, method int android.support.v7.widget.DropDownListView.lookForSelectablePosition(int, boolean) would have incorrectly overridden the package-private method in android.widget.ListView
06-01 18:57:29.343 17833-17849/? D/EGL_emulation: eglMakeCurrent: 0xa090d660: ver 2 0 (tinfo 0xa08d76d0)


這是Manifest檔:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.wutx2.logintestv3forjdbc131">
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />

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

</manifest>

這很像不是錯誤訊息...

不過應該是執行續安全的問題
你要建立新的執行續 去做連線

不然在onCreate修改執行續的策略 不建議這麼做
StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder() .detectDiskReads() .detectDiskWrites() .detectNetwork() .detectResourceMismatches() .detectCustomSlowCalls() .penaltyDeath() .build());

意思是說我貼錯錯誤訊息了嗎?還是說這個不是錯誤?
新建一個執行緒，意思是說我要寫一個新的Handler這樣嗎?
感謝大大的指點~~

不用handler
直接new Thread or 用asynctask