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首先我将用文字简要描述过程/问题。之后，我会附上所有的代码。onPostExecute被调用的太迟
- 我以调试模式启动android应用程序。
- 主要活动被调用。
- 它通过“intent”调用Activity2。
然后（在onCreate）我开始一个异步活动，以便从Web服务器获取信息。我用这个命令“new Kontakt（info1，info2，information）.execute（）;”
我已经在“Kontakt”的onPostExecute方法中设置了一个断点来查看会发生什么。但！！它并不止于此。然后我想，“okey，doInBackground方法并没有因为某种原因而被调用”
当我继续运行代码时，令人惊讶的是，onPostExecute被调用（在onClick结尾的某处）并停止只是我想要它的方式，而不是已经太晚了，因为我希望在onCreate方法中已经有输出，我称之为“新Kontakt（info1，info2，information）.execute（）;”。
那么为什么它调用onPostExecute为时已晚，我可以做些什么来使进程调用它已经在onCreate中的新行Kontakt（info1，info2，information）.execute（）;“在Activity2中？
的代码是下面
MainActivity.java
package com.example.myapplication;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Color;
import android.graphics.PorterDuff;
import android.graphics.drawable.Drawable;
import android.preference.PreferenceManager;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends ActionBarActivity implements View.OnClickListener {
Button button1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button1 = (Button) findViewById(R.id.button1);
button1.setOnClickListener(this);
}
@Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.button1:
Intent intent = new Intent(this, Activity2.class);
startActivity(intent);
break;
}
}
}
Activity2.java
package com.example.myapplication;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.SharedPreferences;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.preference.PreferenceManager;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.text.InputType;
import android.text.TextUtils;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.WindowManager;
import android.view.inputmethod.InputMethodManager;
import android.widget.Button;
import android.widget.EditText;
import org.apache.http.NameValuePair;
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 org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import java.io.IOException;
import java.net.MalformedURLException;
import java.util.ArrayList;
public class Activty2 extends ActionBarActivity implements View.OnClickListener {
Button button;
Context information;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity2);
information=this;
String info1="Yeah";
String info2="Yeah";
new Kontakt(info1, info2, information).execute();
button = (Button) findViewById(R.id.button);
button.setOnClickListener(this);
}
@Override
public void onClick(View view) {
if (view.getId() == R.id.button) {
}
}
Kontakt.java
package com.example.myapplication;
import android.content.Context;
import android.content.DialogInterface;
import android.content.SharedPreferences;
import android.os.AsyncTask;
import android.util.Log;
import org.apache.http.NameValuePair;
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 org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import org.json.JSONObject;
import java.util.ArrayList;
public class Kontakt extends AsyncTask<Void, Void, Integer> {
public static final int CONNECTION_TIMEOUT = 1000 * 15;
public static final String SERVER_ADDRESS = "http://test.site.net/";
String info1;
String info2;
private final Context information;
public Kontakt(String info1, String info2, Context context) {
this.info1=info1;
this.Info2=info2;
this.information=context;
}
@Override
protected Integer doInBackground(Void... params) {
ArrayList<NameValuePair> dataToSend = new ArrayList<>();
dataToSend.add(new BasicNameValuePair("user", info1));
dataToSend.add(new BasicNameValuePair("password", info2));
HttpParams httpRequestParams = getHttpRequestParams();
HttpClient client = new DefaultHttpClient(httpRequestParams);
HttpPost post = new HttpPost(SERVER_ADDRESS
+ "Register.php");
try {
post.setEntity(new UrlEncodedFormEntity(dataToSend));
client.execute(post);
int result=1;
return result;
} catch (Exception e) {
e.printStackTrace();
int result=0;
return result;
}
//return null;
}
private HttpParams getHttpRequestParams() {
HttpParams httpRequestParams = new BasicHttpParams();
HttpConnectionParams.setConnectionTimeout(httpRequestParams,
CONNECTION_TIMEOUT);
HttpConnectionParams.setSoTimeout(httpRequestParams,
CONNECTION_TIMEOUT);
return httpRequestParams;
}
@Override
protected void onPostExecute(Integer result)
{
super.onPostExecute(result);
SharedPreferences.Editor editor = information.getSharedPreferences("INTERNET_KOLL", Context.MODE_PRIVATE).edit();
editor.putString("internet_status", String.valueOf(result));
editor.commit();
}
}
不再...使用线程的AsyncTask ...您无法在onCreate中获得结果...为什么？因为它是**异步**任务http://ideone.com/PPHi95 – Selvin
@Selvin我不明白你的评论：这个代码中没有线程。 ?? – Xebax
说真的，你看不到相似之处？也许有一天......无论如何，使用AsyncTask你甚至可以确定它不会运行onPostExecute，直到onCreate完成，因为它使用处理程序来执行后主线程.. – Selvin