我有两个数组，第一个是选项列表，就像这样由json填充
public class Options {
private String age;
private String optionNo;
private String installmentAmount;
private String noInstallment;
public String getNoInstallment() {
return noInstallment;
}
public void setNoInstallment(String noInstallment) {
this.noInstallment = noInstallment;
}
public String getInstallmentAmount() {
return installmentAmount;
}
public void setInstallmentAmount(String installmentAmount) {
this.installmentAmount = installmentAmount;
}
public String getOptionNo() {
return optionNo;
}
public void setOptionNo(String optionNo) {
this.optionNo = optionNo;
}
second one is templst
public class TempList {
private String tage;
private String toptionNo;
private int tinstallmentAmount;
private int tnoInstallment;
private String tdescription;
private String tto;
private String tmode;
private String tfrom;
public String getTage() {
return tage;
}
public void setTage(String tage) {
this.tage = tage;
}
public String getToptionNo() {
return toptionNo;
}
public void setToptionNo(String toptionNo) {
this.toptionNo = toptionNo;
}
public int getTinstallmentAmount() {
return tinstallmentAmount;
}
public void setTinstallmentAmount(int tinstallmentAmount) {
this.tinstallmentAmount = tinstallmentAmount;
}
public int getTnoInstallment() {
return tnoInstallment;
}
public void setTnoInstallment(int tnoInstallment) {
this.tnoInstallment = tnoInstallment;
}
public String getTdescription() {
return tdescription;
}
public void setTdescription(String tdescription) {
this.tdescription = tdescription;
}
public String getTto() {
return tto;
}
public void setTto(String tto) {
this.tto = tto;
}
public String getTmode() {
return tmode;
}
public void setTmode(String tmode) {
this.tmode = tmode;
}
public String getTfrom() {
return tfrom;
}
public void setTfrom(String tfrom) {
this.tfrom = tfrom;
}
}
在我的主要活动中，我希望将一些细节复制到最新的，因为用户输入的年龄这是我的代码
int age=18;
int amount = 10000;
int installamt;
int tempIndx=0;
for(int i=0; i < optionlst.length; i++){
if (age == Integer.parseInt(optionlst[i].getAge()))
{
installamt = (amount/10000)*(Integer.parseInt(optionlst[i].getInstallmentAmount()));
templst[tempIndx].setTinstallmentAmount(installamt);
templst[tempIndx].setTnoInstallment(Integer.parseInt(optionlst[i].getNoInstallment()));
tempIndx++ ;
}
}
但是当我运行程序时，它给错误应用程序意外停止这是我的logcat，如果有些可以请求我的代码中的错误是什么？
11-26 11:35:36.143: E/AndroidRuntime(656): FATAL EXCEPTION: main
11-26 11:35:36.143: E/AndroidRuntime(656): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.jsonfinal/com.example.jsonfinal.MainActivity}: java.lang.NullPointerException
11-26 11:35:36.143: E/AndroidRuntime(656): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
11-26 11:35:36.143: E/AndroidRuntime(656): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
11-26 11:35:36.143: E/AndroidRuntime(656): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
11-26 11:35:36.143: E/AndroidRuntime(656): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
11-26 11:35:36.143: E/AndroidRuntime(656): at android.os.Handler.dispatchMessage(Handler.java:99)
11-26 11:35:36.143: E/AndroidRuntime(656): at android.os.Looper.loop(Looper.java:123)
11-26 11:35:36.143: E/AndroidRuntime(656): at android.app.ActivityThread.main(ActivityThread.java:3683)
11-26 11:35:36.143: E/AndroidRuntime(656): at java.lang.reflect.Method.invokeNative(Native Method)
11-26 11:35:36.143: E/AndroidRuntime(656): at java.lang.reflect.Method.invoke(Method.java:507)
11-26 11:35:36.143: E/AndroidRuntime(656): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
11-26 11:35:36.143: E/AndroidRuntime(656): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
11-26 11:35:36.143: E/AndroidRuntime(656): at dalvik.system.NativeStart.main(Native Method)
11-26 11:35:36.143: E/AndroidRuntime(656): Caused by: java.lang.NullPointerException
11-26 11:35:36.143: E/AndroidRuntime(656): at com.example.jsonfinal.MainActivity.onCreate(MainActivity.java:170)
11-26 11:35:36.143: E/AndroidRuntime(656): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
11-26 11:35:36.143: E/AndroidRuntime(656): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
11-26 11:35:36.143: E/AndroidRuntime(656): ... 11 more
我的主要活动
import java.io.IOException;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.util.EntityUtils;
import org.apache.http.client.*;
import org.apache.http.impl.client.DefaultHttpClient;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonParser;
import android.support.v7.app.ActionBarActivity;
import android.net.ParseException;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
public class MainActivity extends ActionBarActivity {
HttpClient httpclient1 = new DefaultHttpClient();
HttpClient httpclient2 = new DefaultHttpClient();
Packages[] packagelst;
Options[] optionlst;
TempList[] templst;
int age=18;
int amount = 10000; // to get the expected monthly benefit
int installamt;
int tempIndx=0;
private Thread t1 = null;
private Thread t2 = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
t1 = new Thread(new Runnable() {
public void run() {
try {
HttpGet httpGet = new HttpGet("here my web service address");
// httpGet.setHeader("Content-Type", "application/json");
// httpGet.setHeader("Accept", "JSON");
HttpResponse httpResponse = httpclient1.execute(httpGet);
HttpEntity resEntity = httpResponse.getEntity();
if (resEntity != null) {
String resppack = EntityUtils.toString(resEntity);
Log.i("Response", resppack);
GsonBuilder gsonb = new GsonBuilder();
Gson gson = gsonb.create();
// EDineOpeningHoursServerResponse serverResponse = null;
JsonParser parser = new JsonParser();
if (parser.parse(resppack).isJsonArray()) {
packagelst = gson.fromJson(resppack, Packages[].class);
} else if (parser.parse(resppack).isJsonArray()) {
}
// for(int i = 0; i<packagelst.length; i++)
// {
// Log.i("Option No" , packagelst[i].getOptionNo());
// }
// return serverResponse;
}
else{ Log.i("TAG", "null");}
//return null;
} catch (ClientProtocolException e) {
e.printStackTrace();
// throw new EDineDeliveryException(100, "Error Occurred while processing the request");
} catch (IllegalArgumentException e) {
e.printStackTrace();
// throw new EDineDeliveryException(101, "Invalid user input");
} catch (IOException e) {
e.printStackTrace();
// throw new EDineDeliveryException(102, ApplicationConstants.CONNECTION_LOST_ERROR_MSG);
} catch (ParseException e) {
e.printStackTrace();
// throw new EDineDeliveryException(103, ApplicationConstants.CONNECTION_LOST_ERROR_MSG);
} catch (Exception e) {
e.printStackTrace();
// throw new EDineDeliveryException(106, "Error Occurred while processing the request");
}
}
});
t2 = new Thread(new Runnable() {
public void run() {
try {
HttpGet httpGet = new HttpGet("here my web service address");
// httpGet.setHeader("Content-Type", "application/json");
// httpGet.setHeader("Accept", "JSON");
HttpResponse httpResponse = httpclient2.execute(httpGet);
HttpEntity resEntity = httpResponse.getEntity();
if (resEntity != null) {
String resp = EntityUtils.toString(resEntity);
Log.i("Response", resp);
GsonBuilder gsonb = new GsonBuilder();
Gson gson = gsonb.create();
// EDineOpeningHoursServerResponse serverResponse = null;
JsonParser parser = new JsonParser();
if (parser.parse(resp).isJsonArray()) {
optionlst = gson.fromJson(resp, Options[].class);
} else if (parser.parse(resp).isJsonArray()) {
}
// for(int i = 0; i<optionlst.length; i++)
// {
// Log.i("Age" , optionlst[i].getAge());
// }
// return serverResponse;
}
else{ Log.i("TAG", "null");}
//return null;
} catch (ClientProtocolException e) {
e.printStackTrace();
// throw new EDineDeliveryException(100, "Error Occurred while processing the request");
} catch (IllegalArgumentException e) {
e.printStackTrace();
// throw new EDineDeliveryException(101, "Invalid user input");
} catch (IOException e) {
e.printStackTrace();
// throw new EDineDeliveryException(102, ApplicationConstants.CONNECTION_LOST_ERROR_MSG);
} catch (ParseException e) {
e.printStackTrace();
// throw new EDineDeliveryException(103, ApplicationConstants.CONNECTION_LOST_ERROR_MSG);
} catch (Exception e) {
e.printStackTrace();
// throw new EDineDeliveryException(106, "Error Occurred while processing the request");
}
}
});
t1.start();
t2.start();
for(int i=0; i < optionlst.length; i++){
if (age == Integer.parseInt(optionlst[i].getAge()))
{
installamt = (amount/10000)*(Integer.parseInt(optionlst[i].getInstallmentAmount()));
templst[tempIndx].setTinstallmentAmount(installamt);
templst[tempIndx].setTnoInstallment(Integer.parseInt(optionlst[i].getNoInstallment()));
tempIndx++ ;
}
}
/*
tempIndx = 0;
for(int k=0; k < optionlst.length; k++){
templst[k].setTto(packagelst[k].getTo());
templst[k].setTfrom(packagelst[k].getFrom());
templst[k].setTmode(packagelst[k].getMode());
}
*/
// opp("http://172.20.106.125:8080/BOCService/webresources/abhimana/packages");
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
答案 0 :(得分：0)
您正在尝试从templst数组访问数据，该数据在从中访问数据之前从不进行初始化。
答案 1 :(得分：0)
初始化变量templst：
<强>像：
TempList[] templst = new TempList[size];
或
ArrayList<TempList> templst = new ArrayList<TempList>();
答案 2 :(得分：0)
你的数组templst永远不会被初始化。你可以在循环之前初始化它.Arrays需要一个固定的大小来实例化。