我试图从Android应用程序调用Web服务方法，但我收到错误执行doInBackground（）时发生java.lang.RuntimeException错误 和应用程序停止我已经看到很多关于这个问题，但他们解决了通过添加到清单文件的互联网权限，但它没有工作
这是我的代码
package tony.ds_hw;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONObject;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class get_info extends Activity implements OnClickListener {
Button infobutton;
EditText nametext;
private static String URL="http://192.168.1.102:8080/DS_HW-war/webresources/Getinfo";
private static final String GET_REQUEST="GET";
private static final String POST_REQUEST="POST";
JSONParser jsonParser=new JSONParser();
ProgressDialog pDialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
nametext=(EditText) findViewById(R.id.editText1);
setContentView(R.layout.get_info);
infobutton=(Button) findViewById(R.id.button1);
infobutton.setOnClickListener(this);
}
@Override
public void onClick(View v) {
if (v.getId()==R.id.button1)
{
new Find().execute(URL);
}
}
class Find extends AsyncTask<String,Void,String>
{
String json=null;
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(get_info.this);
pDialog.setMessage("Loading Please wait!");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
Toast.makeText(get_info.this,"finsih pre",Toast.LENGTH_LONG).show();
}
@Override
protected String doInBackground(String... params) {
String name =nametext.getText().toString();
List<NameValuePair> param=new ArrayList<NameValuePair>();
param.add(new BasicNameValuePair("name", name));
JSONObject jsonObject=jsonParser.makeHttpRequest(params[0], GET_REQUEST, param);
json=jsonObject.toString();
if(json != null)
{
Log.d("msg","Success");
}
else
{
Log.d("msg","Failed" );
}
return json;
}
@Override
protected void onPostExecute(String result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
pDialog.dismiss();
if(result!=null) {
Toast.makeText(get_info.this,"Data Loaded successfully", Toast.LENGTH_LONG).show();
Intent i=new Intent(get_info.this,Result.class ).putExtra("jsonstring",result);
finish();
startActivity(i);
} else
Toast.makeText(get_info.this,"Failed To Load Data", Toast.LENGTH_LONG).show();
}
}
}
和logcat
12-31 23:35:58.593: E/AndroidRuntime(1124): FATAL EXCEPTION: AsyncTask #1
12-31 23:35:58.593: E/AndroidRuntime(1124): java.lang.RuntimeException: An error occured while executing doInBackground()
12-31 23:35:58.593: E/AndroidRuntime(1124): at android.os.AsyncTask$3.done(AsyncTask.java:278)
12-31 23:35:58.593: E/AndroidRuntime(1124): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
12-31 23:35:58.593: E/AndroidRuntime(1124): at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
12-31 23:35:58.593: E/AndroidRuntime(1124): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
12-31 23:35:58.593: E/AndroidRuntime(1124): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
12-31 23:35:58.593: E/AndroidRuntime(1124): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208)
12-31 23:35:58.593: E/AndroidRuntime(1124): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
12-31 23:35:58.593: E/AndroidRuntime(1124): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
12-31 23:35:58.593: E/AndroidRuntime(1124): at java.lang.Thread.run(Thread.java:856)
12-31 23:35:58.593: E/AndroidRuntime(1124): Caused by: java.lang.NullPointerException
12-31 23:35:58.593: E/AndroidRuntime(1124): at tony.ds_hw.get_info$Find.doInBackground(get_info.java:73)
12-31 23:35:58.593: E/AndroidRuntime(1124): at tony.ds_hw.get_info$Find.doInBackground(get_info.java:1)
12-31 23:35:58.593: E/AndroidRuntime(1124): at android.os.AsyncTask$2.call(AsyncTask.java:264)
12-31 23:35:58.593: E/AndroidRuntime(1124): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
12-31 23:35:58.593: E/AndroidRuntime(1124): ... 5 more
12-31 23:35:58.943: E/WindowManager(1124): Activity tony.ds_hw.get_info has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@2be0f4a0 that was originally added here
12-31 23:35:58.943: E/WindowManager(1124): android.view.WindowLeaked: Activity tony.ds_hw.get_info has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@2be0f4a0 that was originally added here
12-31 23:35:58.943: E/WindowManager(1124): at android.view.ViewRootImpl.<init>(ViewRootImpl.java:344)
12-31 23:35:58.943: E/WindowManager(1124): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:267)
12-31 23:35:58.943: E/WindowManager(1124): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:215)
12-31 23:35:58.943: E/WindowManager(1124): at android.view.WindowManagerImpl$CompatModeWrapper.addView(WindowManagerImpl.java:140)
12-31 23:35:58.943: E/WindowManager(1124): at android.view.Window$LocalWindowManager.addView(Window.java:537)
12-31 23:35:58.943: E/WindowManager(1124): at android.app.Dialog.show(Dialog.java:278)
12-31 23:35:58.943: E/WindowManager(1124): at tony.ds_hw.get_info$Find.onPreExecute(get_info.java:67)
12-31 23:35:58.943: E/WindowManager(1124): at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:561)
12-31 23:35:58.943: E/WindowManager(1124): at android.os.AsyncTask.execute(AsyncTask.java:511)
12-31 23:35:58.943: E/WindowManager(1124): at tony.ds_hw.get_info.onClick(get_info.java:51)
12-31 23:35:58.943: E/WindowManager(1124): at android.view.View.performClick(View.java:3534)
12-31 23:35:58.943: E/WindowManager(1124): at android.view.View$PerformClick.run(View.java:14263)
12-31 23:35:58.943: E/WindowManager(1124): at android.os.Handler.handleCallback(Handler.java:605)
12-31 23:35:58.943: E/WindowManager(1124): at android.os.Handler.dispatchMessage(Handler.java:92)
12-31 23:35:58.943: E/WindowManager(1124): at android.os.Looper.loop(Looper.java:137)
12-31 23:35:58.943: E/WindowManager(1124): at android.app.ActivityThread.main(ActivityThread.java:4441)
12-31 23:35:58.943: E/WindowManager(1124): at java.lang.reflect.Method.invokeNative(Native Method)
12-31 23:35:58.943: E/WindowManager(1124): at java.lang.reflect.Method.invoke(Method.java:511)
12-31 23:35:58.943: E/WindowManager(1124): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
12-31 23:35:58.943: E/WindowManager(1124): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
12-31 23:35:58.943: E/WindowManager(1124): at dalvik.system.NativeStart.main(Native Method)
答案 0 :(得分：3)
您的问题出在EditText上。您在设置导致windowLeaked和NPE的活动内容之前已经识别出来。
所以要解决这个改变：
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
nametext=(EditText) findViewById(R.id.editText1); //move this!
setContentView(R.layout.get_info);
infobutton=(Button) findViewById(R.id.button1);
为：
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.get_info);
nametext=(EditText) findViewById(R.id.editText1); //to here
infobutton=(Button) findViewById(R.id.button1);
祝你的应用程序运气好，并且编程愉快。