我只是尝试使用HttpUrlConnection通过我的android模拟器添加评论帖，但它没有通过。我有我的互联网权限集和PHP文件工作，因为我可以在浏览器上成功提交。这是我的代码
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add_comment);
MyTask tasker= new MyTask();
tasker.execute();
}
private class MyTask extends AsyncTask<String, String, String> {
@Override
protected String doInBackground(String... params) {
adcomment = (Button) findViewById(R.id.adcomment);
adcomment.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
try {
url = new URL("http://10.0.2.2:8080/addcomment.php");
String param = "user=bb&title=ss&message=uu";
byte[] postData = param.getBytes(Charset.forName("UTF-8"));
conn = (HttpURLConnection) url.openConnection();
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setRequestMethod("POST");
conn.setFixedLengthStreamingMode(param.getBytes().length);
(conn).setFixedLengthStreamingMode(param.length());
DataOutputStream wr = new DataOutputStream(conn.getOutputStream());
wr.write(postData);
Toast.makeText(AddComment.this, "It worked", Toast.LENGTH_LONG).show();
} catch (Exception e) {
e.printStackTrace();
Toast.makeText(AddComment.this, "It failed", Toast.LENGTH_LONG).show();
}
}
});
return null;
}
}
应用程序不会崩溃它只是转到Catch语句，并且此特定行显示在调试中 DataOutputStream wr = new DataOutputStream（conn.getOutputStream（））;
PHP文件是一个简单的插入语句
<?php
require("configExo.php");
if (!empty($_POST)) {
// initial query
$query = "INSERT INTO comments ( username, title, message ) VALUES ( :user, :title, :message ) ";
//Update query
$query_params = array(
':user' => $_POST['username'],
':title' => $_POST['title'],
':message' => $_POST['message']
);
//execute query
try {
$stmt = $db->prepare($query);
$result = $stmt->execute($query_params);
}
catch (PDOException $ex) {
$response["success"] = 0;
$response["message"] = "Database Error. Couldn't add post!";
die(json_encode($response));
}
$response["message"] = "Username Successfully Added!";
echo json_encode($response);
}
else {
?>
<h1>Add Comment</h1>
<form action="addcomment.php" method="post">
Username:<br />
<input type="text" name="username" placeholder="username" />
<br /><br />
Title:<br />
<input type="text" name="title" placeholder="post title" />
<br /><br />
Message:<br />
<input type="text" name="message" placeholder="post message" />
<br /><br />
<input type="submit" value="Add Comment" />
</form>
<?php
}
?>
这是我最新实例的Logcat
04-23 22:43:03.374 78-78/? E/BatteryService﹕ usbOnlinePath not found
04-23 22:43:03.374 78-78/? E/BatteryService﹕ batteryVoltagePath not found
04-23 22:43:03.374 78-78/? E/BatteryService﹕ batteryTemperaturePath not found
04-23 22:43:03.505 78-93/? A/BatteryStatsImpl﹕ problem reading network stats
java.lang.IllegalStateException: problem parsing idx 1
at com.android.internal.net.NetworkStatsFactory.readNetworkStatsDetail(NetworkStatsFactory.java:300)
at com.android.internal.net.NetworkStatsFactory.readNetworkStatsDetail(NetworkStatsFactory.java:250)
at com.android.internal.os.BatteryStatsImpl.getNetworkStatsDetailGroupedByUid(BatteryStatsImpl.java:5734)
at com.android.internal.os.BatteryStatsImpl.access$100(BatteryStatsImpl.java:76)
at com.android.internal.os.BatteryStatsImpl$Uid.computeCurrentTcpBytesReceived(BatteryStatsImpl.java:2457)
at com.android.internal.os.BatteryStatsImpl$Uid.getTcpBytesReceived(BatteryStatsImpl.java:2446)
at com.android.internal.os.BatteryStatsImpl.writeSummaryToParcel(BatteryStatsImpl.java:5437)
at com.android.internal.os.BatteryStatsImpl.writeLocked(BatteryStatsImpl.java:4836)
at com.android.internal.os.BatteryStatsImpl.writeAsyncLocked(BatteryStatsImpl.java:4818)
at com.android.server.am.ActivityManagerService.<init>(ActivityManagerService.java:1492)
at com.android.server.am.ActivityManagerService.<init>(ActivityManagerService.java:151)
at com.android.server.am.ActivityManagerService$AThread.run(ActivityManagerService.java:1393)
Caused by: java.io.FileNotFoundException: /proc/net/xt_qtaguid/stats: open failed: ENOENT (No such file or directory)
at libcore.io.IoBridge.open(IoBridge.java:406)
at java.io.FileInputStream.<init>(FileInputStream.java:78)
at com.android.internal.net.NetworkStatsFactory.readNetworkStatsDetail(NetworkStatsFactory.java:269)
at com.android.internal.net.NetworkStatsFactory.readNetworkStatsDetail(NetworkStatsFactory.java:250)
at com.android.internal.os.BatteryStatsImpl.getNetworkStatsDetailGroupedByUid(BatteryStatsImpl.java:5734)
at com.android.internal.os.BatteryStatsImpl.access$100(BatteryStatsImpl.java:76)
at com.android.internal.os.BatteryStatsImpl$Uid.computeCurrentTcpBytesReceived(BatteryStatsImpl.java:2457)
at com.android.internal.os.BatteryStatsImpl$Uid.getTcpBytesReceived(BatteryStatsImpl.java:2446)
at com.android.internal.os.BatteryStatsImpl.writeSummaryToParcel(BatteryStatsImpl.java:5437)
at com.android.internal.os.BatteryStatsImpl.writeLocked(BatteryStatsImpl.java:4836)
at com.android.internal.os.BatteryStatsImpl.writeAsyncLocked(BatteryStatsImpl.java:4818)
at com.android.server.am.ActivityManagerService.<init>(ActivityManagerService.java:1492)
at com.android.server.am.ActivityManagerService.<init>(ActivityManagerService.java:151)
at com.android.server.am.ActivityManagerService$AThread.run(ActivityManagerService.java:1393)
Caused by: libcore.io.ErrnoException: open failed: ENOENT (No such file or directory)
at libcore.io.Posix.open(Native Method)
at libcore.io.BlockGuardOs.open(BlockGuardOs.java:110)
at libcore.io.IoBridge.open(IoBridge.java:390)
at java.io.FileInputStream.<init>(FileInputStream.java:78)
at com.android.internal.net.NetworkStatsFactory.readNetworkStatsDetail(NetworkStatsFactory.java:269)
at com.android.internal.net.NetworkStatsFactory.readNetworkStatsDetail(NetworkStatsFactory.java:250)
at com.android.internal.os.BatteryStatsImpl.getNetworkStatsDetailGroupedByUid(BatteryStatsImpl.java:5734)
at com.android.internal.os.BatteryStatsImpl.access$100(BatteryStatsImpl.java:76)
at com.android.internal.os.BatteryStatsImpl$Uid.computeCurrentTcpBytesReceived(BatteryStatsImpl.java:2457)
at com.android.internal.os.BatteryStatsImpl$Uid.getTcpBytesReceived(BatteryStatsImpl.java:2446)
at com.android.internal.os.BatteryStatsImpl.writeSummaryToParcel(BatteryStatsImpl.java:5437)
at com.android.internal.os.BatteryStatsImpl.writeLocked(BatteryStatsImpl.java:4836)
at com.android.internal.os.BatteryStatsImpl.writeAsyncLocked(BatteryStatsImpl.java:4818)
at com.android.server.am.ActivityManagerService.<init>(ActivityManagerService.java:1492)
at com.android.server.am.ActivityManagerService.<init>(ActivityManagerService.java:151)
at com.android.server.am.ActivityManagerService$AThread.run(ActivityManagerService.java:1393)
04-23 22:43:03.535 78-93/? E/AndroidRuntime﹕ Error reporting WTF
java.lang.NullPointerException
at com.android.internal.os.RuntimeInit.wtf(RuntimeInit.java:345)
at android.util.Log$1.onTerribleFailure(Log.java:103)
at android.util.Log.wtf(Log.java:278)
at com.android.internal.os.BatteryStatsImpl.getNetworkStatsDetailGroupedByUid(BatteryStatsImpl.java:5738)
at com.android.internal.os.BatteryStatsImpl.access$100(BatteryStatsImpl.java:76)
at com.android.internal.os.BatteryStatsImpl$Uid.computeCurrentTcpBytesReceived(BatteryStatsImpl.java:2457)
at com.android.internal.os.BatteryStatsImpl$Uid.getTcpBytesReceived(BatteryStatsImpl.java:2446)
at com.android.internal.os.BatteryStatsImpl.writeSummaryToParcel(BatteryStatsImpl.java:5437)
at com.android.internal.os.BatteryStatsImpl.writeLocked(BatteryStatsImpl.java:4836)
at com.android.internal.os.BatteryStatsImpl.writeAsyncLocked(BatteryStatsImpl.java:4818)
at com.android.server.am.ActivityManagerService.<init>(ActivityManagerService.java:1492)
at com.android.server.am.ActivityManagerService.<init>(ActivityManagerService.java:151)
at com.android.server.am.ActivityManagerService$AThread.run(ActivityManagerService.java:1393)
04-23 22:43:04.104 78-87/? E/StrictMode﹕ A resource was acquired at attached stack trace but never released. See java.io.Closeable for information on avoiding resource leaks.
java.lang.Throwable: Explicit termination method 'close' not called
at dalvik.system.CloseGuard.open(CloseGuard.java:184)
at java.io.FileInputStream.<init>(FileInputStream.java:80)
at com.android.server.pm.UserManager.readUserList(UserManager.java:114)
at com.android.server.pm.UserManager.<init>(UserManager.java:81)
at com.android.server.pm.UserManager.<init>(UserManager.java:85)
at com.android.server.pm.PackageManagerService.<init>(PackageManagerService.java:923)
at com.android.server.pm.PackageManagerService.main(PackageManagerService.java:833)
at com.android.server.ServerThread.run(SystemServer.java:163)
04-23 22:43:08.134 78-121/? E/SoundPool﹕ error loading /system/media/audio/ui/Lock.ogg
04-23 22:43:08.134 78-121/? E/SoundPool﹕ error loading /system/media/audio/ui/Unlock.ogg
04-23 22:43:08.235 78-126/? E/EventHub﹕ could not get driver version for /dev/input/mouse0, Not a typewriter
04-23 22:43:08.235 78-126/? E/EventHub﹕ could not get driver version for /dev/input/mice, Not a typewriter
04-23 22:43:08.414 33-56/? E/CommandListener﹕ Failed to open /proc/sys/net/ipv6/conf/wlan0/disable_ipv6: No such file or directory
04-23 22:43:08.414 78-92/? E/WifiStateMachine﹕ Failed to disable IPv6: java.lang.IllegalStateException: Unable to communicate to native daemon for disabling ipv6
04-23 22:43:08.464 78-92/? E/MobileDataStateTracker﹕ default: Ignoring feature request because could not acquire PhoneService
04-23 22:43:08.464 78-92/? E/MobileDataStateTracker﹕ default: Could not enable APN type "default"
04-23 22:43:12.955 158-229/? E/ActivityThread﹕ Failed to find provider info for com.android.inputmethod.latin.dictionarypack
04-23 22:43:13.015 158-229/? E/BinaryDictionaryGetter﹕ Could not find a dictionary pack
04-23 22:43:19.748 78-129/? A/NetworkStats﹕ problem reading network stats
java.lang.IllegalStateException: problem parsing idx 1
at com.android.internal.net.NetworkStatsFactory.readNetworkStatsDetail(NetworkStatsFactory.java:300)
at com.android.server.NetworkManagementService.getNetworkStatsUidDetail(NetworkManagementService.java:1282)
at com.android.server.net.NetworkStatsService.performPollLocked(NetworkStatsService.java:831)
at com.android.server.net.NetworkStatsService.updateIfacesLocked(NetworkStatsService.java:743)
at com.android.server.net.NetworkStatsService.updateIfaces(NetworkStatsService.java:721)
at com.android.server.net.NetworkStatsService.access$000(NetworkStatsService.java:128)
at com.android.server.net.NetworkStatsService$8.handleMessage(NetworkStatsService.java:1633)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:137)
at android.os.HandlerThread.run(HandlerThread.java:60)
Caused by: java.io.FileNotFoundException: /proc/net/xt_qtaguid/stats: open failed: ENOENT (No such file or directory)
at libcore.io.IoBridge.open(IoBridge.java:406)
at java.io.FileInputStream.<init>(FileInputStream.java:78)
at com.android.internal.net.NetworkStatsFactory.readNetworkStatsDetail(NetworkStatsFactory.java:269)
at com.android.server.NetworkManagementService.getNetworkStatsUidDetail(NetworkManagementService.java:1282)
at com.android.server.net.NetworkStatsService.performPollLocked(NetworkStatsService.java:831)
at com.android.server.net.NetworkStatsService.updateIfacesLocked(NetworkStatsService.java:743)
at com.android.server.net.NetworkStatsService.updateIfaces(NetworkStatsService.java:721)
at com.android.server.net.NetworkStatsService.access$000(NetworkStatsService.java:128)
at com.android.server.net.NetworkStatsService$8.handleMessage(NetworkStatsService.java:1633)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:137)
at android.os.HandlerThread.run(HandlerThread.java:60)
Caused by: libcore.io.ErrnoException: open failed: ENOENT (No such file or directory)
at libcore.io.Posix.open(Native Method)
at libcore.io.BlockGuardOs.open(BlockGuardOs.java:110)
at libcore.io.IoBridge.open(IoBridge.java:390)
at java.io.FileInputStream.<init>(FileInputStream.java:78)
at com.android.internal.net.NetworkStatsFactory.readNetworkStatsDetail(NetworkStatsFactory.java:269)
at com.android.server.NetworkManagementService.getNetworkStatsUidDetail(NetworkManagementService.java:1282)
at com.android.server.net.NetworkStatsService.performPollLocked(NetworkStatsService.java:831)
at com.android.server.net.NetworkStatsService.updateIfacesLocked(NetworkStatsService.java:743)
at com.android.server.net.NetworkStatsService.updateIfaces(NetworkStatsService.java:721)
at com.android.server.net.NetworkStatsService.access$000(NetworkStatsService.java:128)
at com.android.server.net.NetworkStatsService$8.handleMessage(NetworkStatsService.java:1633)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:137)
at android.os.HandlerThread.run(HandlerThread.java:60)
04-23 22:43:24.138 78-141/? E/SoundPool﹕ error loading /system/media/audio/ui/Effect_Tick.ogg
04-23 22:43:24.138 78-141/? E/SoundPool﹕ error loading /system/media/audio/ui/Effect_Tick.ogg
04-23 22:43:24.138 78-141/? E/SoundPool﹕ error loading /system/media/audio/ui/Effect_Tick.ogg
04-23 22:43:24.138 78-141/? E/SoundPool﹕ error loading /system/media/audio/ui/Effect_Tick.ogg
04-23 22:43:24.138 78-141/? E/SoundPool﹕ error loading /system/media/audio/ui/Effect_Tick.ogg
04-23 22:43:24.149 78-141/? E/SoundPool﹕ error loading /system/media/audio/ui/KeypressStandard.ogg
04-23 22:43:24.149 78-141/? E/SoundPool﹕ error loading /system/media/audio/ui/KeypressSpacebar.ogg
04-23 22:43:24.149 78-141/? E/SoundPool﹕ error loading /system/media/audio/ui/KeypressDelete.ogg
04-23 22:43:24.149 78-141/? E/SoundPool﹕ error loading /system/media/audio/ui/KeypressReturn.ogg
04-23 22:43:25.839 78-129/? A/NetworkStats﹕ problem reading network stats
java.lang.IllegalStateException: problem parsing idx 1
at com.android.internal.net.NetworkStatsFactory.readNetworkStatsDetail(NetworkStatsFactory.java:300)
at com.android.server.NetworkManagementService.getNetworkStatsUidDetail(NetworkManagementService.java:1282)
at com.android.server.net.NetworkStatsService.performPollLocked(NetworkStatsService.java:831)
at com.android.server.net.NetworkStatsService.updateIfacesLocked(NetworkStatsService.java:743)
at com.android.server.net.NetworkStatsService.updateIfaces(NetworkStatsService.java:721)
at com.android.server.net.NetworkStatsService.access$000(NetworkStatsService.java:128)
at com.android.server.net.NetworkStatsService$1.onReceive(NetworkStatsService.java:612)
at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:728)
at android.os.Handler.handleCallback(Handler.java:605)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.os.HandlerThread.run(HandlerThread.java:60)
Caused by: java.io.FileNotFoundException: /proc/net/xt_qtaguid/stats: open failed: ENOENT (No such file or directory)
at libcore.io.IoBridge.open(IoBridge.java:406)
at java.io.FileInputStream.<init>(FileInputStream.java:78)
at com.android.internal.net.NetworkStatsFactory.readNetworkStatsDetail(NetworkStatsFactory.java:269)
at com.android.server.NetworkManagementService.getNetworkStatsUidDetail(NetworkManagementService.java:1282)
at com.android.server.net.NetworkStatsService.performPollLocked(NetworkStatsService.java:831)
at com.android.server.net.NetworkStatsService.updateIfacesLocked(NetworkStatsService.java:743)
at com.android.server.net.NetworkStatsService.updateIfaces(NetworkStatsService.java:721)
at com.android.server.net.NetworkStatsService.access$000(NetworkStatsService.java:128)
at com.android.server.net.NetworkStatsService$1.onReceive(NetworkStatsService.java:612)
at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:728)
at android.os.Handler.handleCallback(Handler.java:605)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.os.HandlerThread.run(HandlerThread.java:60)
Caused by: libcore.io.ErrnoException: open failed: ENOENT (No such file or directory)
at libcore.io.Posix.open(Native Method)
at libcore.io.BlockGuardOs.open(BlockGuardOs.java:110)
at libcore.io.IoBridge.open(IoBridge.java:390)
at java.io.FileInputStream.<init>(FileInputStream.java:78)
at com.android.internal.net.NetworkStatsFactory.readNetworkStatsDetail(NetworkStatsFactory.java:269)
at com.android.server.NetworkManagementService.getNetworkStatsUidDetail(NetworkManagementService.java:1282)
at com.android.server.net.NetworkStatsService.performPollLocked(NetworkStatsService.java:831)
at com.android.server.net.NetworkStatsService.updateIfacesLocked(NetworkStatsService.java:743)
at com.android.server.net.NetworkStatsService.updateIfaces(NetworkStatsService.java:721)
at com.android.server.net.NetworkStatsService.access$000(NetworkStatsService.java:128)
at com.android.server.net.NetworkStatsService$1.onReceive(NetworkStatsService.java:612)
at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:728)
at android.os.Handler.handleCallback(Handler.java:605)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.os.HandlerThread.run(HandlerThread.java:60)
04-23 22:43:30.578 320-344/? E/DefaultVoicemailNotifier﹕ No voicemails to notify about: clear the notification.
答案 0 :(得分：1)
看起来问题是你的OnClickListener在doInBackground内。
将OnClickListener移至onCreate()，并在点击该按钮时启动AsyncTask：
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add_comment);
adcomment = (Button) findViewById(R.id.adcomment);
adcomment.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//Start AsyncTask
MyTask tasker= new MyTask();
tasker.execute();
}
});
}
private class MyTask extends AsyncTask<String, String, String> {
@Override
protected String doInBackground(String... params) {
try {
url = new URL("http://10.0.2.2:8080/addcomment.php");
String param = "user=bb&title=ss&message=uu";
byte[] postData = param.getBytes(Charset.forName("UTF-8"));
conn = (HttpURLConnection) url.openConnection();
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setRequestMethod("POST");
conn.setFixedLengthStreamingMode(param.getBytes().length);
(conn).setFixedLengthStreamingMode(param.length());
DataOutputStream wr = new DataOutputStream(conn.getOutputStream());
wr.write(postData);
Toast.makeText(AddComment.this, "It worked", Toast.LENGTH_LONG).show();
} catch (Exception e) {
e.printStackTrace();
Toast.makeText(AddComment.this, "It failed", Toast.LENGTH_LONG).show();
}
return null;
}
}