Java 仍然得到android.os.NetworkOnMainThreadException，我做错了什么？
只是想从MySql服务器上的php文件中获取一点信息，以显示应用程序建立了连接。此时，它会使应用程序崩溃，并抛出org.Apache.http.client.clientprotocolexecption，如果这是一个noob问题，请原谅，我用java编程才4个月 logcat:Java 仍然得到android.os.NetworkOnMainThreadException，我做错了什么？,java,android,Java,Android,只是想从MySql服务器上的php文件中获取一点信息，以显示应用程序建立了连接。此时，它会使应用程序崩溃，并抛出org.Apache.http.client.clientprotocolexecption，如果这是一个noob问题，请原谅，我用java编程才4个月 logcat: 11-06 09:51:20.268: E/log.tag(2748): Error in http connection org.apache.http.client.ClientProtocolException
11-06 09:51:20.268: E/log.tag(2748): Error in http connection org.apache.http.client.ClientProtocolException
11-06 09:51:20.268: W/dalvikvm(2748): threadid=13: thread exiting with uncaught exception (group=0x40a13300)
11-06 09:51:20.288: E/AndroidRuntime(2748): FATAL EXCEPTION: Thread-83
11-06 09:51:20.288: E/AndroidRuntime(2748): android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
11-06 09:51:20.288: E/AndroidRuntime(2748): at android.view.ViewRootImpl.checkThread(ViewRootImpl.java:4609)
11-06 09:51:20.288: E/AndroidRuntime(2748): at android.view.ViewRootImpl.invalidateChildInParent(ViewRootImpl.java:867)
11-06 09:51:20.288: E/AndroidRuntime(2748): at android.view.ViewGroup.invalidateChild(ViewGroup.java:4066)
11-06 09:51:20.288: E/AndroidRuntime(2748): at android.view.View.invalidate(View.java:10250)
11-06 09:51:20.288: E/AndroidRuntime(2748): at android.view.View.invalidate(View.java:10205)
11-06 09:51:20.288: E/AndroidRuntime(2748): at android.widget.TextView.checkForRelayout(TextView.java:6296)
11-06 09:51:20.288: E/AndroidRuntime(2748): at android.widget.TextView.setText(TextView.java:3547)
11-06 09:51:20.288: E/AndroidRuntime(2748): at android.widget.TextView.setText(TextView.java:3405)
11-06 09:51:20.288: E/AndroidRuntime(2748): at android.widget.TextView.setText(TextView.java:3380)
11-06 09:51:20.288: E/AndroidRuntime(2748): at com.mobile.donswholesale.AppInfo$1$1.run(AppInfo.java:111)
11-06 09:51:20.288: E/AndroidRuntime(2748): at java.lang.Thread.run(Thread.java:856)
test.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
new Thread(new Runnable() {
public void run() {
try {
HttpParams httpParams = new BasicHttpParams();
HttpClient httpclient = new DefaultHttpClient();
HttpPost httpost = new HttpPost("http://"
+ serverIp.getText().toString()
+ "/mobile.php");
httpost.setHeader("Accept", "application/json");
HttpResponse response = httpclient.execute(httpost);
HttpEntity entity = response.getEntity();
isr = entity.getContent();
} catch (Exception e) {
Log.e("log.tag",
"Error in http connection " + e.toString());
resultView.setText("Could not connect to Database");
}
try {
BufferedReader reader = new BufferedReader(
new InputStreamReader(isr, "iso=8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
isr.close();
result = sb.toString();
} catch (Exception e) {
Log.e("log.tag",
"Error converting result " + e.toString());
}
try {
String s = "";
JSONArray jArray = new JSONArray(result);
for (int i = 0; i < jArray.length(); i++) {
JSONObject json = jArray.getJSONObject(i);
s = s + "User :" + json.getString("UserName");
}
resultView.setText(s);
} catch (Exception e) {
Log.e("log.tag",
"Error Parsing Data " + e.toString());
}
Log.d(MainActivity.DEBUGTAG, "Didn't Work ");
return;
}
protected void onPostExecute(Void results) {
}
}).start();
}
});
11-06 09:51:20.268: E/log.tag(2748): Error in http connection org.apache.http.client.ClientProtocolException
11-06 09:51:20.268: W/dalvikvm(2748): threadid=13: thread exiting with uncaught exception (group=0x40a13300)
11-06 09:51:20.288: E/AndroidRuntime(2748): FATAL EXCEPTION: Thread-83
11-06 09:51:20.288: E/AndroidRuntime(2748): android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
11-06 09:51:20.288: E/AndroidRuntime(2748): at android.view.ViewRootImpl.checkThread(ViewRootImpl.java:4609)
11-06 09:51:20.288: E/AndroidRuntime(2748): at android.view.ViewRootImpl.invalidateChildInParent(ViewRootImpl.java:867)
11-06 09:51:20.288: E/AndroidRuntime(2748): at android.view.ViewGroup.invalidateChild(ViewGroup.java:4066)
11-06 09:51:20.288: E/AndroidRuntime(2748): at android.view.View.invalidate(View.java:10250)
11-06 09:51:20.288: E/AndroidRuntime(2748): at android.view.View.invalidate(View.java:10205)
11-06 09:51:20.288: E/AndroidRuntime(2748): at android.widget.TextView.checkForRelayout(TextView.java:6296)
11-06 09:51:20.288: E/AndroidRuntime(2748): at android.widget.TextView.setText(TextView.java:3547)
11-06 09:51:20.288: E/AndroidRuntime(2748): at android.widget.TextView.setText(TextView.java:3405)
11-06 09:51:20.288: E/AndroidRuntime(2748): at android.widget.TextView.setText(TextView.java:3380)
11-06 09:51:20.288: E/AndroidRuntime(2748): at com.mobile.donswholesale.AppInfo$1$1.run(AppInfo.java:111)
11-06 09:51:20.288: E/AndroidRuntime(2748): at java.lang.Thread.run(Thread.java:856)
test.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
new Thread(new Runnable() {
public void run() {
try {
HttpParams httpParams = new BasicHttpParams();
HttpClient httpclient = new DefaultHttpClient();
HttpPost httpost = new HttpPost("http://"
+ serverIp.getText().toString()
+ "/mobile.php");
httpost.setHeader("Accept", "application/json");
HttpResponse response = httpclient.execute(httpost);
HttpEntity entity = response.getEntity();
isr = entity.getContent();
} catch (Exception e) {
Log.e("log.tag",
"Error in http connection " + e.toString());
resultView.setText("Could not connect to Database");
}
try {
BufferedReader reader = new BufferedReader(
new InputStreamReader(isr, "iso=8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
isr.close();
result = sb.toString();
} catch (Exception e) {
Log.e("log.tag",
"Error converting result " + e.toString());
}
try {
String s = "";
JSONArray jArray = new JSONArray(result);
for (int i = 0; i < jArray.length(); i++) {
JSONObject json = jArray.getJSONObject(i);
s = s + "User :" + json.getString("UserName");
}
resultView.setText(s);
} catch (Exception e) {
Log.e("log.tag",
"Error Parsing Data " + e.toString());
}
Log.d(MainActivity.DEBUGTAG, "Didn't Work ");
return;
}
protected void onPostExecute(Void results) {
}
}).start();
}
});
test.setOnClickListener（新视图.OnClickListener（）{
@凌驾
公共void onClick（视图v）{
新线程（newrunnable（））{
公开募捐{
试一试{
HttpParams HttpParams=新的BasicHttpParams（）；
HttpClient HttpClient=新的DefaultHttpClient（）；
HttpPost HttpPost=新的HttpPost（“http://”
+serverIp.getText（）.toString（）
+“/mobile.php”）；
setHeader（“接受”、“应用程序/json”）；
HttpResponse response=httpclient.execute（httpost）；
HttpEntity=response.getEntity（）；
isr=entity.getContent（）；
}捕获（例外e）{
Log.e（“Log.tag”，
“http连接错误”+e.toString（））；
resultView.setText（“无法连接到数据库”）；
}
试一试{
BufferedReader reader=新的BufferedReader(
新的InputStreamReader（isr，“iso=8859-1”），8）；
StringBuilder sb=新的StringBuilder（）；
字符串行=null；
而（（line=reader.readLine（））！=null）{
sb.追加（第+行“\n”）；
}
isr.close（）；
结果=sb.toString（）；
}捕获（例外e）{
Log.e（“Log.tag”，
“转换结果时出错”+e.toString（））；
}
试一试{
字符串s=“”；
JSONArray jArray=新JSONArray（结果）；
for（int i=0；i class A extends AsyncTask<Void, Void, String> {
protected String doInBackground(Void... params) {
String result = "";
try {
HttpParams httpParams = new BasicHttpParams();
HttpClient httpclient = new DefaultHttpClient();
HttpPost httpost = new HttpPost("http://"
+ serverIp.getText().toString()
+ "/mobile.php");
httpost.setHeader("Accept", "application/json");
HttpResponse response = httpclient.execute(httpost);
HttpEntity entity = response.getEntity();
isr = entity.getContent();
} catch (Exception e) {
Log.e("log.tag",
"Error in http connection " + e.toString());
return null;
//resultView.setText("Could not connect to Database");
}
try {
BufferedReader reader = new BufferedReader(
new InputStreamReader(isr, "iso=8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
isr.close();
result = sb.toString();
} catch (Exception e) {
Log.e("log.tag",
"Error converting result " + e.toString());
}
try {
String s = "";
JSONArray jArray = new JSONArray(result);
for (int i = 0; i < jArray.length(); i++) {
JSONObject json = jArray.getJSONObject(i);
s = s + "User :" + json.getString("UserName");
}
return s;
} catch (Exception e) {
Log.e("log.tag",
"Error Parsing Data " + e.toString());
}
}
protected void onPostExecute(String s) {
if (s == null) {
resultView.setText("Could not connect to Database");
}
else {
resultView.setText(s);
}
}
您的问题是您试图在UI线程之外的视图上设置文本。因此，您已经为http访问创建了新线程，现在您可以从同一线程调用setText。如上所述，使用AsyncTask 您是否添加了权限：什么是logcat输出？我怀疑您是否得到了您认为的异常，因为线程看起来很好，但是您似乎正在尝试从非UI线程更新某些UI元素，而您无法做到是internet已启用，log cat:HTTP连接org.Apache.HTTP.client.ClientProtocolExecOption中的错误。“只有创建视图层次结构的原始线程才能接触其视图。”它就在stacktrace中，您可能没有读过。