我正在尝试在空白游戏中创建一个填充。我已经给出了在旋转器下拉菜单中选择的选项（10个旋转器用于10个空白）。直到它的工作。但是为了计算分数，我想将所选选项存储在字符串数组中。我在这里得到NullPointerException。
package com.example.harimohan.myapplication;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
public class StartPage extends AppCompatActivity implements AdapterView.OnItemSelectedListener {
TextView substring1;
TextView substring2;
TextView substring3;
TextView substring4;
TextView substring5;
TextView substring6;
TextView substring7;
TextView substring8;
TextView substring9;
TextView substring10;
TextView substring11;
Spinner blank1 ;
Spinner blank2 ;
Spinner blank3 ;
Spinner blank4 ;
Spinner blank5 ;
Spinner blank6 ;
Spinner blank7 ;
Spinner blank8 ;
Spinner blank9 ;
Spinner blank10;
String[] subs = new String[20] ;
String[] words = "batsmen domestically scored ranked appearances previously outstanding announced recipient aviation".split(" ");
String[] ans = new String[10];
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_start_page);
blank1 = (Spinner) findViewById(R.id.Blank1);
Spinner blank2 = (Spinner) findViewById(R.id.Blank2);
Spinner blank3 = (Spinner) findViewById(R.id.Blank3);
Spinner blank4 = (Spinner) findViewById(R.id.Blank4);
Spinner blank5 = (Spinner) findViewById(R.id.Blank5);
Spinner blank6 = (Spinner) findViewById(R.id.Blank6);
Spinner blank7 = (Spinner) findViewById(R.id.Blank7);
Spinner blank8 = (Spinner) findViewById(R.id.Blank8);
Spinner blank9 = (Spinner) findViewById(R.id.Blank9);
Spinner blank10 = (Spinner) findViewById(R.id.Blank10);
blank1.setOnItemSelectedListener(this );
blank2.setOnItemSelectedListener( this);
blank3.setOnItemSelectedListener( this);
blank4.setOnItemSelectedListener( this);
blank5.setOnItemSelectedListener( this);
blank6.setOnItemSelectedListener( this);
blank7.setOnItemSelectedListener( this);
blank8.setOnItemSelectedListener( this);
blank9.setOnItemSelectedListener( this);
blank10.setOnItemSelectedListener( this);
substring1 = (TextView) findViewById(R.id.subs1);
substring2 = (TextView) findViewById(R.id.subs2);
substring3 = (TextView) findViewById(R.id.subs3);
substring4 = (TextView) findViewById(R.id.subs4);
substring5 = (TextView) findViewById(R.id.subs5);
substring6 = (TextView) findViewById(R.id.subs6);
substring7 = (TextView) findViewById(R.id.subs7);
substring8 = (TextView) findViewById(R.id.subs8);
substring9 = (TextView) findViewById(R.id.subs9);
substring10= (TextView) findViewById(R.id.subs10);
substring11= (TextView) findViewById(R.id.subs11);
new jsontask(). execute("https://en.wikipedia.org/w/api.php?action=query&prop=extracts&explaintext=&titles=Sachin_Tendulkar&formatversion=2&format=json");
List<String> categories = new ArrayList<String>();
categories.add("Select Answer");
categories.add(words[8]);
categories.add(words[1]);
categories.add(words[4]);
categories.add(words[3]);
categories.add(words[7]);
categories.add(words[5]);
categories.add(words[6]);
categories.add(words[0]);
categories.add(words[2]);
categories.add(words[9]);
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, categories);
dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
blank1.setAdapter(dataAdapter);
blank2.setAdapter(dataAdapter);
blank3.setAdapter(dataAdapter);
blank4.setAdapter(dataAdapter);
blank5.setAdapter(dataAdapter);
blank6.setAdapter(dataAdapter);
blank7.setAdapter(dataAdapter);
blank8.setAdapter(dataAdapter);
blank9.setAdapter(dataAdapter);
blank10.setAdapter(dataAdapter);
/*ans[0] = blank1.getSelectedItem().toString();
ans[1] = blank2.getSelectedItem().toString();
ans[2] = blank3.getSelectedItem().toString();
ans[3]= blank4.getSelectedItem().toString();
ans[4] = blank5.getSelectedItem().toString();
ans[5] = blank6.getSelectedItem().toString();
ans[6] = blank7.getSelectedItem().toString();
ans[7] = blank8.getSelectedItem().toString();
ans[8] = blank9.getSelectedItem().toString();
ans[9] = blank10.getSelectedItem().toString();*/
}
public int Score( String[] WordString, String[] AnsString){
for (int j=0;j<AnsString.length;j++) {
Log.d("Ans: " ,j +" : "+ AnsString[j]);
}
int scores=0;
for (int i=0;i<WordString.length;i++){
if (WordString[i].contains(AnsString[i])) {
scores++;
}
}
Log.d("scores",Integer.toString(scores));
return scores;
}
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
// On selecting a spinner item
String item = parent.getItemAtPosition(position).toString();
try{
Spinner spinner = (Spinner) parent;
Log.d("spinner=",Integer.toString(spinner.getId()));
Log.d("R.id.Blank1=",Integer.toString(R.id.Blank1));
Log.d("Blank1 value=",blank1.getSelectedItem().toString());
/*if(spinner.getId() == R.id.Blank1)
{*/
String ans = blank1.getSelectedItem().toString();
Log.d("ans0 ",ans);
/*}
else if(spinner.getId() == R.id.Blank2)
{
ans[1] = blank2.getSelectedItem().toString();
Log.d("ans1 ",ans[1]);
}*/
}catch (Exception exception)
{
exception.printStackTrace();
}
// Showing selected spinner item
Toast.makeText(parent.getContext(), "Selected: " + item +" at "+position+""+id, Toast.LENGTH_LONG).show();
}
@Override
public void onNothingSelected(AdapterView<?> adapterView) {
}
public class jsontask extends AsyncTask<String, String, String[]> {
@Override
protected String[] doInBackground(String... params) {
HttpURLConnection connection = null;
BufferedReader reader = null;
try {
URL url = new URL(params[0]);
connection = (HttpURLConnection) url.openConnection();
connection.connect();
InputStream stream = connection.getInputStream();
reader = new BufferedReader(new InputStreamReader(stream));
StringBuffer buffer = new StringBuffer();
String line ;
while ((line=reader.readLine())!= null) {
buffer.append(line);
}
String json = buffer.toString();
JSONObject parentObj = new JSONObject(json);
JSONObject query = parentObj.getJSONObject("query");
JSONArray pages = query.getJSONArray("pages");
JSONObject pagearray = pages.getJSONObject(0);
String extract = pagearray.getString("extract");
int lines = 0;
int pos = 0;
String print = null;
int x;
while ((pos = extract.indexOf(".", pos) + 1) != 0) {
lines++;
if(lines==10){
x= extract.indexOf("\n",pos);
print = extract.substring(0,x);
break;
}
}
String[] sentence = print.split(" ");
for (int j = 0 ; j < words.length;j++){
boolean flag= false;
for (int i = 0; i < sentence.length ; i++) {
if (sentence[i].equals(words[j])) {
/* System.out.println(words[j]+" is found at "+ i);
System.out.println("size of "+words[j]+"="+words[j].length());
*/
if (j==0){
System.out.println("end "+print.indexOf(words[j]));
System.out.println(print.substring(0,i));
subs[j]= print.substring(0,print.indexOf(words[j]));
System.out.println(print.indexOf(words[j]));
}
else{
int start = print.indexOf(words[j-1])+ words[j-1].length();
/*System.out.println(print.indexOf(words[j-1])+"+" +words[j-1].length());
System.out.println("start"+start);
System.out.println("end"+print.indexOf(words[j]));*/
subs[j]= print.substring(start,print.indexOf(words[j]));
if(j==9){
int n =print.indexOf(words[j])+ words[j].length();
subs[10]=print.substring(n);
}
}
flag= true;
break;
}
}
if (!flag ){
System.out.println("doesnt found");
}
}
return subs;
} catch (MalformedURLException e1) {
e1.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
} finally {
if (connection != null) {
connection.disconnect();
}
try {
if (reader != null) {
reader.close();
}
} catch (IOException e3) {
e3.printStackTrace();
}
}
return null;
}
@Override
protected void onPostExecute(String[] result) {
super.onPostExecute(result);
substring1.setText(subs[0]);
substring2.setText(subs[1]);
substring3.setText(subs[2]);
substring4.setText(subs[3]);
substring5.setText(subs[4]);
substring6.setText(subs[5]);
substring7.setText(subs[6]);
substring8.setText(subs[7]);
substring9.setText(subs[8]);
substring10.setText(subs[9]);
substring11.setText(subs[10]);
}
}
public void gotoScorePage(View view){
Score(words,ans);
Intent nextPage=new Intent(StartPage.this,ScorePage.class);
nextPage.putExtra("Score",Score(words,ans));
startActivity(nextPage);
}
}
这是logcat
07-13 12:33:18.360 19760-19760/com.example.harimohan.myapplication D/dalvikvm: VFY: replacing opcode 0x20 at 0x0016
07-13 12:33:18.810 19760-19760/com.example.harimohan.myapplication D/spinner=: 2131492976
07-13 12:33:18.810 19760-19760/com.example.harimohan.myapplication D/R.id.Blank1=: 2131492976
07-13 12:33:18.810 19760-19760/com.example.harimohan.myapplication W/System.err: java.lang.NullPointerException
07-13 12:33:18.810 19760-19760/com.example.harimohan.myapplication W/System.err: at com.example.harimohan.myapplication.StartPage.onItemSelected(StartPage.java:174)
07-13 12:33:18.810 19760-19760/com.example.harimohan.myapplication W/System.err: at android.widget.AdapterView.fireOnSelected(AdapterView.java:893)
07-13 12:33:18.820 19760-19760/com.example.harimohan.myapplication W/System.err: at android.widget.AdapterView.access$200(AdapterView.java:48)
07-13 12:33:18.820 19760-19760/com.example.harimohan.myapplication W/System.err: at android.widget.AdapterView$SelectionNotifier.run(AdapterView.java:861)
07-13 12:33:18.820 19760-19760/com.example.harimohan.myapplication W/System.err: at android.os.Handler.handleCallback(Handler.java:733)
07-13 12:33:18.820 19760-19760/com.example.harimohan.myapplication W/System.err: at android.os.Handler.dispatchMessage(Handler.java:95)
07-13 12:33:18.830 19760-19760/com.example.harimohan.myapplication W/System.err: at android.os.Looper.loop(Looper.java:136)
07-13 12:33:18.830 19760-19760/com.example.harimohan.myapplication W/System.err: at android.app.ActivityThread.main(ActivityThread.java:5017)
07-13 12:33:18.830 19760-19760/com.example.harimohan.myapplication W/System.err: at java.lang.reflect.Method.invokeNative(Native Method)
07-13 12:33:18.830 19760-19760/com.example.harimohan.myapplication W/System.err: at java.lang.reflect.Method.invoke(Method.java:515)
07-13 12:33:18.830 19760-19760/com.example.harimohan.myapplication W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
07-13 12:33:18.830 19760-19760/com.example.harimohan.myapplication W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
07-13 12:33:18.830 19760-19760/com.example.harimohan.myapplication W/System.err: at dalvik.system.NativeStart.main(Native Method)
07-13 12:33:18.840 19760-19760/com.example.harimohan.myapplication D/spinner=: 2131492978
07-13 12:33:18.840 19760-19760/com.example.harimohan.myapplication D/R.id.Blank1=: 2131492976
07-13 12:33:18.850 19760-19760/com.example.harimohan.myapplication W/System.err: java.lang.NullPointerException
07-13 12:33:18.850 19760-19760/com.example.harimohan.myapplication W/System.err: at com.example.harimohan.myapplication.StartPage.onItemSelected(StartPage.java:174)
07-13 12:33:18.860 19760-19760/com.example.harimohan.myapplication W/System.err: at android.widget.AdapterView.fireOnSelected(AdapterView.java:893)
07-13 12:33:18.860 19760-19760/com.example.harimohan.myapplication W/System.err: at android.widget.AdapterView.access$200(AdapterView.java:48)
07-13 12:33:18.860 19760-19760/com.example.harimohan.myapplication W/System.err: at android.widget.AdapterView$SelectionNotifier.run(AdapterView.java:861)
07-13 12:33:18.860 19760-19760/com.example.harimohan.myapplication W/System.err: at android.os.Handler.handleCallback(Handler.java:733)
07-13 12:33:18.860 19760-19760/com.example.harimohan.myapplication W/System.err: at android.os.Handler.dispatchMessage(Handler.java:95)
07-13 12:33:18.860 19760-19760/com.example.harimohan.myapplication W/System.err: at android.os.Looper.loop(Looper.java:136)
07-13 12:33:18.860 19760-19760/com.example.harimohan.myapplication W/System.err: at android.app.ActivityThread.main(ActivityThread.java:5017)
07-13 12:33:18.860 19760-19760/com.example.harimohan.myapplication W/System.err: at java.lang.reflect.Method.invokeNative(Native Method)
07-13 12:33:18.860 19760-19760/com.example.harimohan.myapplication W/System.err: at java.lang.reflect.Method.invoke(Method.java:515)
07-13 12:33:18.860 19760-19760/com.example.harimohan.myapplication W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
07-13 12:33:18.860 19760-19760/com.example.harimohan.myapplication W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
07-13 12:33:18.860 19760-19760/com.example.harimohan.myapplication W/System.err: at dalvik.system.NativeStart.main(Native Method)
07-13 12:33:18.860 19760-19760/com.example.harimohan.myapplication D/spinner=: 2131492980
07-13 12:33:18.860 19760-19760/com.example.harimohan.myapplication D/R.id.Blank1=: 2131492976
07-13 12:33:18.860 19760-19760/com.example.harimohan.myapplication W/System.err: java.lang.NullPointerException
07-13 12:33:18.860 19760-19760/com.example.harimohan.myapplication W/System.err: at com.example.harimohan.myapplication.StartPage.onItemSelected(StartPage.java:174)
07-13 12:33:18.860 19760-19760/com.example.harimohan.myapplication W/System.err: at android.widget.AdapterView.fireOnSelected(AdapterView.java:893)
07-13 12:33:18.860 19760-19760/com.example.harimohan.myapplication W/System.err: at android.widget.AdapterView.access$200(AdapterView.java:48)
07-13 12:33:18.860 19760-19760/com.example.harimohan.myapplication W/System.err: at android.widget.AdapterView$SelectionNotifier.run(AdapterView.java:861)
07-13 12:33:18.860 19760-19760/com.example.harimohan.myapplication W/System.err: at android.os.Handler.handleCallback(Handler.java:733)
07-13 12:33:18.860 19760-19760/com.example.harimohan.myapplication W/System.err: at android.os.Handler.dispatchMessage(Handler.java:95)
07-13 12:33:18.860 19760-19760/com.example.harimohan.myapplication W/System.err: at android.os.Looper.loop(Looper.java:136)
07-13 12:33:18.860 19760-19760/com.example.harimohan.myapplication W/System.err: at android.app.ActivityThread.main(ActivityThread.java:5017)
07-13 12:33:18.860 19760-19760/com.example.harimohan.myapplication W/System.err: at java.lang.reflect.Method.invokeNative(Native Method)
07-13 12:33:18.860 19760-19760/com.example.harimohan.myapplication W/System.err: at java.lang.reflect.Method.invoke(Method.java:515)
07-13 12:33:18.860 19760-19760/com.example.harimohan.myapplication W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
07-13 12:33:18.860 19760-19760/com.example.harimohan.myapplication W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
07-13 12:33:18.860 19760-19760/com.example.harimohan.myapplication W/System.err: at dalvik.system.NativeStart.main(Native Method)
07-13 12:33:18.880 19760-19760/com.example.harimohan.myapplication D/spinner=: 2131492982
07-13 12:33:18.880 19760-19760/com.example.harimohan.myapplication D/R.id.Blank1=: 2131492976
07-13 12:33:18.880 19760-19760/com.example.harimohan.myapplication W/System.err: java.lang.NullPointerException
07-13 12:33:18.880 19760-19760/com.example.harimohan.myapplication W/System.err: at com.example.harimohan.myapplication.StartPage.onItemSelected(StartPage.java:174)
07-13 12:33:18.880 19760-19760/com.example.harimohan.myapplication W/System.err: at android.widget.AdapterView.fireOnSelected(AdapterView.java:893)
07-13 12:33:18.880 19760-19760/com.example.harimohan.myapplication W/System.err: at android.widget.AdapterView.access$200(AdapterView.java:48)
07-13 12:33:18.880 19760-19760/com.example.harimohan.myapplication W/System.err: at android.widget.AdapterView$SelectionNotifier.run(AdapterView.java:861)
07-13 12:33:18.880 19760-19760/com.example.harimohan.myapplication W/System.err: at android.os.Handler.handleCallback(Handler.java:733)
07-13 12:33:18.880 19760-19760/com.example.harimohan.myapplication W/System.err: at android.os.Handler.dispatchMessage(Handler.java:95)
07-13 12:33:18.880 19760-19760/com.example.harimohan.myapplication W/System.err: at android.os.Looper.loop(Looper.java:136)
07-13 12:33:18.880 19760-19760/com.example.harimohan.myapplication W/System.err: at android.app.ActivityThread.main(ActivityThread.java:5017)
07-13 12:33:18.880 19760-19760/com.example.harimohan.myapplication W/System.err: at java.lang.reflect.Method.invokeNative(Native Method)
07-13 12:33:18.880 19760-19760/com.example.harimohan.myapplication W/System.err: at java.lang.reflect.Method.invoke(Method.java:515)
07-13 12:33:18.880 19760-19760/com.example.harimohan.myapplication W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
07-13 12:33:18.880 19760-19760/com.example.harimohan.myapplication W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
07-13 12:33:18.880 19760-19760/com.example.harimohan.myapplication W/System.err: at dalvik.system.NativeStart.main(Native Method)
07-13 12:33:18.890 19760-19760/com.example.harimohan.myapplication D/spinner=: 2131492984
07-13 12:33:18.890 19760-19760/com.example.harimohan.myapplication D/R.id.Blank1=: 2131492976
07-13 12:33:18.890 19760-19760/com.example.harimohan.myapplication W/System.err: java.lang.NullPointerException
07-13 12:33:18.890 19760-19760/com.example.harimohan.myapplication W/System.err: at com.example.harimohan.myapplication.StartPage.onItemSelected(StartPage.java:174)
07-13 12:33:18.890 19760-19760/com.example.harimohan.myapplication W/System.err: at android.widget.AdapterView.fireOnSelected(AdapterView.java:893)
07-13 12:33:18.890 19760-19760/com.example.harimohan.myapplication W/System.err: at android.widget.AdapterView.access$200(AdapterView.java:48)
07-13 12:33:18.890 19760-19760/com.example.harimohan.myapplication W/System.err: at android.widget.AdapterView$SelectionNotifier.run(AdapterView.java:861)
07-13 12:33:18.890 19760-19760/com.example.harimohan.myapplication W/System.err: at android.os.Handler.handleCallback(Handler.java:733)
07-13 12:33:18.890 19760-19760/com.example.harimohan.myapplication W/System.err: at android.os.Handler.dispatchMessage(Handler.java:95)
07-13 12:33:18.890 19760-19760/com.example.harimohan.myapplication W/System.err: at android.os.Looper.loop(Looper.java:136)
07-13 12:33:18.890 19760-19760/com.example.harimohan.myapplication W/System.err: at android.app.ActivityThread.main(ActivityThread.java:5017)
07-13 12:33:18.890 19760-19760/com.example.harimohan.myapplication W/System.err: at java.lang.reflect.Method.invokeNative(Native Method)
07-13 12:33:18.890 19760-19760/com.example.harimohan.myapplication W/System.err: at java.lang.reflect.Method.invoke(Method.java:515)
07-13 12:33:18.890 19760-19760/com.example.harimohan.myapplication W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
07-13 12:33:18.890 19760-19760/com.example.harimohan.myapplication W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
07-13 12:33:18.890 19760-19760/com.example.harimohan.myapplication W/System.err: at dalvik.system.NativeStart.main(Native Method)
07-13 12:33:18.890 19760-19760/com.example.harimohan.myapplication D/spinner=: 2131492986
07-13 12:33:18.890 19760-19760/com.example.harimohan.myapplication D/R.id.Blank1=: 2131492976
07-13 12:33:18.890 19760-19760/com.example.harimohan.myapplication W/System.err: java.lang.NullPointerException
07-13 12:33:18.890 19760-19760/com.example.harimohan.myapplication W/System.err: at com.example.harimohan.myapplication.StartPage.onItemSelected(StartPage.java:174)
07-13 12:33:18.890 19760-19760/com.example.harimohan.myapplication W/System.err: at android.widget.AdapterView.fireOnSelected(AdapterView.java:893)
07-13 12:33:18.890 19760-19760/com.example.harimohan.myapplication W/System.err: at android.widget.AdapterView.access$200(AdapterView.java:48)
07-13 12:33:18.890 19760-19760/com.example.harimohan.myapplication W/System.err: at android.widget.AdapterView$SelectionNotifier.run(AdapterView.java:861)
07-13 12:33:18.890 19760-19760/com.example.harimohan.myapplication W/System.err: at android.os.Handler.handleCallback(Handler.java:733)
07-13 12:33:18.890 19760-19760/com.example.harimohan.myapplication W/System.err: at android.os.Handler.dispatchMessage(Handler.java:95)
07-13 12:33:18.900 19760-19760/com.example.harimohan.myapplication W/System.err: at android.os.Looper.loop(Looper.java:136)
07-13 12:33:18.900 19760-19760/com.example.harimohan.myapplication W/System.err: at android.app.ActivityThread.main(ActivityThread.java:5017)
07-13 12:33:18.900 19760-19760/com.example.harimohan.myapplication W/System.err: at java.lang.reflect.Method.invokeNative(Native Method)
07-13 12:33:18.900 19760-19760/com.example.harimohan.myapplication W/System.err: at java.lang.reflect.Method.invoke(Method.java:515)
07-13 12:33:18.900 19760-19760/com.example.harimohan.myapplication W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
07-13 12:33:18.900 19760-19760/com.example.harimohan.myapplication W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
07-13 12:33:18.900 19760-19760/com.example.harimohan.myapplication W/System.err: at dalvik.system.NativeStart.main(Native Method)
07-13 12:33:18.900 19760-19760/com.example.harimohan.myapplication D/spinner=: 2131492988
07-13 12:33:18.900 19760-19760/com.example.harimohan.myapplication D/R.id.Blank1=: 2131492976
07-13 12:33:18.900 19760-19760/com.example.harimohan.myapplication W/System.err: java.lang.NullPointerException
07-13 12:33:18.900 19760-19760/com.example.harimohan.myapplication W/System.err: at com.example.harimohan.myapplication.StartPage.onItemSelected(StartPage.java:174)
07-13 12:33:18.900 19760-19760/com.example.harimohan.myapplication W/System.err: at android.widget.AdapterView.fireOnSelected(AdapterView.java:893)
07-13 12:33:18.900 19760-19760/com.example.harimohan.myapplication W/System.err: at android.widget.AdapterView.access$200(AdapterView.java:48)
07-13 12:33:18.900 19760-19760/com.example.harimohan.myapplication W/System.err: at android.widget.AdapterView$SelectionNotifier.run(AdapterView.java:861)
07-13 12:33:18.900 19760-19760/com.example.harimohan.myapplication W/System.err: at android.os.Handler.handleCallback(Handler.java:733)
07-13 12:33:18.900 19760-19760/com.example.harimohan.myapplication W/System.err: at android.os.Handler.dispatchMessage(Handler.java:95)
07-13 12:33:18.900 19760-19760/com.example.harimohan.myapplication W/System.err: at android.os.Looper.loop(Looper.java:136)
07-13 12:33:18.900 19760-19760/com.example.harimohan.myapplication W/System.err: at android.app.ActivityThread.main(ActivityThread.java:5017)
07-13 12:33:18.900 19760-19760/com.example.harimohan.myapplication W/System.err: at java.lang.reflect.Method.invokeNative(Native Method)
07-13 12:33:18.900 19760-19760/com.example.harimohan.myapplication W/System.err: at java.lang.reflect.Method.invoke(Method.java:515)
07-13 12:33:18.900 19760-19760/com.example.harimohan.myapplication W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
07-13 12:33:18.900 19760-19760/com.example.harimohan.myapplication W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
07-13 12:33:18.900 19760-19760/com.example.harimohan.myapplication
答案 0 :(得分：0)
您可以尝试检查第174行中null的位置（blank1.getSelectedItem（）返回null值）。这对你解决问题很有帮助。请原谅我的英语很差。
答案 1 :(得分：0)
有：
at com.example.harimohan.myapplication.StartPage.onItemSelected(StartPage.java:174)
你选择了null值
也许你应该在create方法中初始化blank1。