为什么运行此代码时模拟器会崩溃?
TextView servmsg;
String data;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.test_msg);
Vars();
new SendtheData().execute("");
}
private void Vars() {
// TODO Auto-generated method stub
servmsg = (TextView) findViewById(R.id.tvServerMsg);
}
public class SendtheData extends AsyncTask<String, Integer, Void> {
protected void onPreExecute(String f) {
// called before doInBackground has started
f = "f";
}
protected Void doInBackground(String... params) {
// TODO Auto-generated method stub
HttpClient client = new DefaultHttpClient();
HttpPost post = new HttpPost(
"http://192.168.1.6/androidp2p/process.php");
try {
List<NameValuePair> pairs = new ArrayList<NameValuePair>(3);
pairs.add(new BasicNameValuePair("from", "test4"));
pairs.add(new BasicNameValuePair("to", ""));
pairs.add(new BasicNameValuePair("message", ""));
post.setEntity(new UrlEncodedFormEntity(pairs));
HttpResponse response = client.execute(post);
// Convert the response into a String
HttpEntity resEntity = response.getEntity();
// Print the response
data = EntityUtils.toString(resEntity);
servmsg.setText(data);
// Write the response to a log file
if (resEntity != null) {
Log.i("RESPONSE", EntityUtils.toString(resEntity));
}
} catch (UnsupportedEncodingException uee) {
uee.printStackTrace();
} catch (ClientProtocolException cpe) {
cpe.printStackTrace();
} catch (IOException ioe) {
ioe.printStackTrace();
}
return null;
}
protected void onProgressUpdate(Integer... progress) {
// called when the background task has made any progress
}
protected void onPostExecute() {
// called after doInBackground has finished
}
}
但是当我发表评论时:
// data = EntityUtils.toString(resEntity) // servmsg.setText(data)
它工作正常。如何将服务器的响应发送到xml TextView?
此外,如果我可以添加,服务器的响应有3个字段,“to,from和message”。将每个文件放入自己的TextViews的最佳方法是什么?
logcat的:
E/Trace(1584): error opening trace file: No such file or directory (2)
D/gralloc_goldfish(1584): Emulator without GPU emulation detected.
I/Choreographer(1584): Skipped 102 frames! The application may be doing too much work on its main thread.
W/dalvikvm(1584): threadid=11: thread exiting with uncaught exception (group=0x40a13300)
E/AndroidRuntime(1584): FATAL EXCEPTION: AsyncTask #1
E/AndroidRuntime(1584): java.lang.RuntimeException: An error occured while executing doInBackground()
E/AndroidRuntime(1584): at android.os.AsyncTask$3.done(AsyncTask.java:299)
E/AndroidRuntime(1584): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
E/AndroidRuntime(1584): at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
E/AndroidRuntime(1584): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
E/AndroidRuntime(1584): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
提前致谢。
尝试后 protected void onPostExecute(){ //在doInBackground完成后调用 servmsg.setText(数据); }
这是新的LogCat:
03-27 00:56:24.006: W/dalvikvm(1736): threadid=11: thread exiting with uncaught exception (group=0x40a13300)
03-27 00:56:24.048: E/AndroidRuntime(1736): FATAL EXCEPTION: AsyncTask #1
03-27 00:56:24.048: E/AndroidRuntime(1736): java.lang.RuntimeException: An error occured while executing doInBackground()
03-27 00:56:24.048: E/AndroidRuntime(1736): at android.os.AsyncTask$3.done(AsyncTask.java:299)
03-27 00:56:24.048: E/AndroidRuntime(1736): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
03-27 00:56:24.048: E/AndroidRuntime(1736): at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
03-27 00:56:24.048: E/AndroidRuntime(1736): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
03-27 00:56:24.048: E/AndroidRuntime(1736): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
03-27 00:56:24.048: E/AndroidRuntime(1736): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
03-27 00:56:24.048: E/AndroidRuntime(1736): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
03-27 00:56:24.048: E/AndroidRuntime(1736): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
03-27 00:56:24.048: E/AndroidRuntime(1736): at java.lang.Thread.run(Thread.java:856)
03-27 00:56:24.048: E/AndroidRuntime(1736): Caused by: java.lang.IllegalStateException: Content has been consumed
03-27 00:56:24.048: E/AndroidRuntime(1736): at org.apache.http.entity.BasicHttpEntity.getContent(BasicHttpEntity.java:84)
03-27 00:56:24.048: E/AndroidRuntime(1736): at org.apache.http.conn.BasicManagedEntity.getContent(BasicManagedEntity.java:100)
03-27 00:56:24.048: E/AndroidRuntime(1736): at org.apache.http.util.EntityUtils.toString(EntityUtils.java:112)
03-27 00:56:24.048: E/AndroidRuntime(1736): at org.apache.http.util.EntityUtils.toString(EntityUtils.java:146)
03-27 00:56:24.048: E/AndroidRuntime(1736): at com.project.keegan.testPrintMsg$SendtheData.doInBackground(testPrintMsg.java:77)
03-27 00:56:24.048: E/AndroidRuntime(1736): at com.project.keegan.testPrintMsg$SendtheData.doInBackground(testPrintMsg.java:1)
03-27 00:56:24.048: E/AndroidRuntime(1736): at android.os.AsyncTask$2.call(AsyncTask.java:287)
03-27 00:56:24.048: E/AndroidRuntime(1736): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
这是我的PHP代码:
<?php
/* connect to database */
$db = mysql_connect("localhost", "root", "root");
if (!$db)
die('could not connect');
mysql_select_db('androidp2p')
or die("could not select database");
$from = mysql_real_escape_string($_POST['from']);
$to = mysql_real_escape_string($_POST['to']);
$message = mysql_real_escape_string($_POST['message']);
if ($_POST['to'])
{
/* user wants to send a message */
$query = "INSERT INTO messages (fromuser, touser, message) VALUES ('$from', '$to', '$message')";
mysql_query($query)
or die("\n\ndatabase error!\n". mysql_error());
echo "ok. Messages have been saved.";
}
else
{
/* user wants to retrieve his messages*/
$query = "SELECT * FROM messages WHERE touser='$from'";
$result = mysql_query($query)
or die("\n\ndatabase error!\n". mysql_error());
$message_count = mysql_num_rows($result);
if( $message_count == 0)
{
/* no messages*/
echo "ok. There are no messages.";
}
else
{
/* output messages */
while ($row = mysql_fetch_assoc($result))
{
echo "message start\n{$row['fromuser']}\n{$row['message']}\nmessage end\n";
}
/* clear messages */
$query = "DELETE FROM messages WHERE touser='$from'";
mysql_query($query)
or die("\n\ndatabase error!\n". mysql_error());
echo "ok. Cleared all messages.";
}
}
?>
答案 0 :(得分:0)
public class SendtheData extends AsyncTask<String, Integer, String> {
protected void onPreExecute(String f) {
// called before doInBackground has started
f = "f";
}
protected String doInBackground(String... params) {
// TODO Auto-generated method stub
String data = null;
HttpClient client = new DefaultHttpClient();
HttpPost post = new HttpPost(
"http://192.168.1.6/androidp2p/process.php");
try {
List<NameValuePair> pairs = new ArrayList<NameValuePair>(3);
pairs.add(new BasicNameValuePair("from", "test4"));
pairs.add(new BasicNameValuePair("to", ""));
pairs.add(new BasicNameValuePair("message", ""));
post.setEntity(new UrlEncodedFormEntity(pairs));
HttpResponse response = client.execute(post);
// Convert the response into a String
HttpEntity resEntity = response.getEntity();
// Print the response
data = EntityUtils.toString(resEntity);
// Write the response to a log file
if (resEntity != null) {
Log.i("RESPONSE", EntityUtils.toString(resEntity));
}
} catch (UnsupportedEncodingException uee) {
uee.printStackTrace();
} catch (ClientProtocolException cpe) {
cpe.printStackTrace();
} catch (IOException ioe) {
ioe.printStackTrace();
}
return data;
}
protected void onProgressUpdate(Integer... progress) {
// called when the background task has made any progress
}
protected void onPostExecute(String data) {
if(null != data)
{
servmsg.setText(data);
}else{
//handle Error
}
}
}
您可以像这样更改AsyncTask
,实施。始终使用onPsotExecute
的{{1}}方法处理结果。希望这会有所帮助。
另外如果我可以添加,服务器的响应有3个字段, “来自,来自和消息”。将这些中的每一个放入的最佳方法是什么? 他们自己的TextViews?
您从PHP页面返回的响应,您可以将其设为AsyncTask
响应,并从客户端使用android JSON
解析JSON
响应,您的响应可能如下所示JSONParser