我正在尝试添加getByName以获取主机名的IP地址，并在我的POST命令中使用它 问题是无论我在哪里插入此代码，它都会崩溃 我试图插入doInBackground它也崩溃所以我应该在哪里插入??
package com.example.loginad;
import java.net.InetAddress;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import android.os.AsyncTask;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class Logindb extends Activity {
Button login;
EditText u,p;
TextView res;
String result;
String x="mobile";
String host;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.logindb);
login=(Button)findViewById(R.id.login);
u=(EditText)findViewById(R.id.u);
p=(EditText)findViewById(R.id.p);
res=(TextView)findViewById(R.id.res);
login.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
new MyAsyncTask().execute(u.getText().toString(),p.getText().toString());
}
});
}
private class MyAsyncTask extends AsyncTask<String, Integer, Boolean>{
@Override
protected Boolean doInBackground(String... params) {
// TODO Auto-generated method stub
boolean success = postData(params[0],params[1]);
try
{
InetAddress address=null;
address = InetAddress.getByName("Nicky-PC");
host=address.getHostAddress();
}
catch(Exception e)
{
e.printStackTrace();
}
return success;
}
protected void onPostExecute(Boolean localres){
if (localres){
res.setText("A Correct Username and Password");
}else{
res.setText("Incorrect Username or Password");
}
Toast.makeText(getApplicationContext(), "command sent", Toast.LENGTH_LONG).show();
}
protected void onProgressUpdate(Integer... progress){
//pb.setProgress(progress[0]);
//Toast.makeText(getApplicationContext(), "Done", Toast.LENGTH_LONG).show();
}
/*public void ObtainHost()
{
try
{
}
catch(Exception e)
{
Toast.makeText(getApplicationContext(), e.toString(), Toast.LENGTH_LONG).show();
}
} */
public Boolean postData(String a,String b) {
ArrayList<NameValuePair> postParameters = new ArrayList<NameValuePair>();
postParameters.add(new BasicNameValuePair("username", a));
postParameters.add(new BasicNameValuePair("password", b));
postParameters.add(new BasicNameValuePair("mobileid",x));
// String valid = "1";
String response = null;
try {
// Toast.makeText(getApplicationContext(), host.toString(), Toast.LENGTH_LONG).show();
response = CustomHttpClient.executeHttpPost("http://"+host+"/new/check.php",postParameters);
//now in result you will have the response from php file either 0 or 1.
result = response.toString();
// res = res.trim();
result = result.replaceAll("\\s+", "");
// error.setText(res);
} catch (Exception e) {
res.setText(e.toString());
}
return result.equals("1");
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.logindb, menu);
return true;
}
}
堆栈跟踪
11-26 21:28:37.856: D/libEGL(17150): loaded /system/lib/egl/libEGL_genymotion.so
11-26 21:28:37.876: D/(17150): HostConnection::get() New Host Connection established 0xb8ed35a8, tid 17150
11-26 21:28:37.900: D/libEGL(17150): loaded /system/lib/egl/libGLESv1_CM_genymotion.so
11-26 21:28:37.900: D/libEGL(17150): loaded /system/lib/egl/libGLESv2_genymotion.so
11-26 21:28:37.968: W/EGL_genymotion(17150): eglSurfaceAttrib not implemented
11-26 21:28:37.976: E/OpenGLRenderer(17150): Getting MAX_TEXTURE_SIZE from GradienCache
11-26 21:28:37.996: E/OpenGLRenderer(17150): Getting MAX_TEXTURE_SIZE from Caches::initConstraints()
11-26 21:28:37.996: D/OpenGLRenderer(17150): Enabling debug mode 0
11-26 21:28:44.876: W/dalvikvm(17150): threadid=13: thread exiting with uncaught exception (group=0xa4c1f648)
11-26 21:28:44.920: E/AndroidRuntime(17150): FATAL EXCEPTION: AsyncTask #3
11-26 21:28:44.920: E/AndroidRuntime(17150): java.lang.RuntimeException: An error occured while executing doInBackground()
11-26 21:28:44.920: E/AndroidRuntime(17150): at android.os.AsyncTask$3.done(AsyncTask.java:299)
11-26 21:28:44.920: E/AndroidRuntime(17150): at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352)
11-26 21:28:44.920: E/AndroidRuntime(17150): at java.util.concurrent.FutureTask.setException(FutureTask.java:219)
11-26 21:28:44.920: E/AndroidRuntime(17150): at java.util.concurrent.FutureTask.run(FutureTask.java:239)
11-26 21:28:44.920: E/AndroidRuntime(17150): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
11-26 21:28:44.920: E/AndroidRuntime(17150): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
11-26 21:28:44.920: E/AndroidRuntime(17150): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
11-26 21:28:44.920: E/AndroidRuntime(17150): at java.lang.Thread.run(Thread.java:841)
11-26 21:28:44.920: E/AndroidRuntime(17150): Caused by: android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
11-26 21:28:44.920: E/AndroidRuntime(17150): at android.view.ViewRootImpl.checkThread(ViewRootImpl.java:5908)
11-26 21:28:44.920: E/AndroidRuntime(17150): at android.view.ViewRootImpl.requestLayout(ViewRootImpl.java:837)
11-26 21:28:44.920: E/AndroidRuntime(17150): at android.view.View.requestLayout(View.java:15792)
11-26 21:28:44.920: E/AndroidRuntime(17150): at android.view.View.requestLayout(View.java:15792)
11-26 21:28:44.920: E/AndroidRuntime(17150): at android.view.View.requestLayout(View.java:15792)
11-26 21:28:44.920: E/AndroidRuntime(17150): at android.view.View.requestLayout(View.java:15792)
11-26 21:28:44.920: E/AndroidRuntime(17150): at android.widget.RelativeLayout.requestLayout(RelativeLayout.java:358)
11-26 21:28:44.920: E/AndroidRuntime(17150): at android.view.View.requestLayout(View.java:15792)
11-26 21:28:44.920: E/AndroidRuntime(17150): at android.widget.TextView.checkForRelayout(TextView.java:6524)
11-26 21:28:44.920: E/AndroidRuntime(17150): at android.widget.TextView.setText(TextView.java:3771)
11-26 21:28:44.920: E/AndroidRuntime(17150): at android.widget.TextView.setText(TextView.java:3629)
11-26 21:28:44.920: E/AndroidRuntime(17150): at android.widget.TextView.setText(TextView.java:3604)
11-26 21:28:44.920: E/AndroidRuntime(17150): at com.example.loginad.Logindb$MyAsyncTask.postData(Logindb.java:130)
11-26 21:28:44.920: E/AndroidRuntime(17150): at com.example.loginad.Logindb$MyAsyncTask.doInBackground(Logindb.java:70)
11-26 21:28:44.920: E/AndroidRuntime(17150): at com.example.loginad.Logindb$MyAsyncTask.doInBackground(Logindb.java:1)
11-26 21:28:44.920: E/AndroidRuntime(17150): at android.os.AsyncTask$2.call(AsyncTask.java:287)
11-26 21:28:44.920: E/AndroidRuntime(17150): at java.util.concurrent.FutureTask.run(FutureTask.java:234)
11-26 21:28:44.920: E/AndroidRuntime(17150): ... 4 more
11-26 21:28:44.932: D/dalvikvm(17150): GC_FOR_ALLOC freed 259K, 5% free 6365K/6660K, paused 8ms, total 8ms
答案 0 :(得分：1)
首先，如果您将使用AsyncHttpClient，那么您不需要AsyncTask，但如果您将使用HttpClient，则需要AsyncTask任务。 以下代码是执行get和post请求的工作代码的一部分。根据需要修改
@Override
protected String doInBackground(String... params) {
backGroundExecuted = false;
Log.d("doInBackground", "Start processing doInBackground");
HttpClient httpClient = null;
HttpPost httpPost = null;
HttpGet httpGet = null;
if (httpMethodType == null || url == null) {
Log.d("doInBackground" , "The URL and Method Type is mandatory, cannot be null - httpMethodType =" + httpMethodType + " and url =" + url);
this.getApiResponse().setSuccess(false);
this.getApiResponse().setResponseCode(HttpResponseCode.BAD_REQUEST);
this.getApiResponse().setResponseDescription("The URL and Method Type is mandatory, cannot be null");
return null;
}
try {
//set timeout
HttpParams httpParameters = new BasicHttpParams();
HttpConnectionParams.setConnectionTimeout(httpParameters, TIME_OUT);
HttpConnectionParams.setSoTimeout(httpParameters, SOCKET_TIME_OUT);
httpClient = new DefaultHttpClient(httpParameters);
HttpResponse httpResponse = null;
if (httpMethodType.equals(HTTPMethodType.POST.toString())) {
httpPost = new HttpPost(url);
//setting json object to request.
if (postParams != null) {
AbstractHttpEntity entity = null;
entity = new ByteArrayEntity(postParams.getBytes("UTF8"));
if (httpContentType != null) {
entity.setContentType(new BasicHeader(HTTP.CONTENT_TYPE, httpContentType));
}
httpPost.setEntity(entity);
}
httpResponse = httpClient.execute(httpPost);
} else if (httpMethodType.equals(HTTPMethodType.GET.toString()) || httpMethodType.equals(HTTPMethodType.PUT.toString())) {
if (queryParams != null) {
url = url + "?" + URLEncodedUtils.format(queryParams, "utf-8");
Log.d(TAG ,"new URL :" + url);
}
httpGet = new HttpGet(url);
httpResponse = httpClient.execute(httpGet);
}
this.getApiResponse().setResponseCode(httpResponse.getStatusLine().getStatusCode());
this.getApiResponse().setResponseDescription(httpResponse.getStatusLine().getReasonPhrase());
if (this.getApiResponse().getResponseCode() != HttpStatus.SC_OK) {
this.getApiResponse().setSuccess(false);
Log.w(getClass().getSimpleName(),
"Error " + this.getApiResponse().getResponseCode() + " for URL " + url);
Log.w(getClass().getSimpleName(),
"Error " + this.getApiResponse().getResponseDescription() + " for URL " + url);
}
Log.d("doInBackground", "The API call executed and will check the response");
HttpEntity entityResp = httpResponse.getEntity();
if (entityResp != null) {
this.getApiResponse().setResponse(appHelper.getStringFromInputStream(entityResp.getContent()));
Log.d("doInBackground","The response is :" + this.getApiResponse().getResponse());
this.getApiResponse().setSuccess(true);
}
} catch (UnsupportedEncodingException e1) {
Log.e("doInBackground","Exception :" + e1.toString());
this.getApiResponse().setSuccess(false);
this.getApiResponse().setResponseCode(HttpResponseCode.BAD_REQUEST);
this.getApiResponse().setResponseDescription("Exception :" + e1.toString());
Log.e("doInBackground","Exception :" + e1.toString());
e1.printStackTrace();
} catch (Exception e) {
Log.e("doInBackground","Exception :" + e.toString());
this.getApiResponse().setSuccess(false);
this.getApiResponse().setResponseCode(HttpResponseCode.BAD_REQUEST);
this.getApiResponse().setResponseDescription("Exception :" + e.toString());
if (httpPost != null && !httpPost.isAborted()) {
httpPost.abort();
}
} finally {
if (httpClient != null) {
httpClient.getConnectionManager().shutdown();
}
backGroundExecuted = true;
}
return null;
}