Android:索引1处的绑定值为空错误
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【中文标题】Android:索引1处的绑定值为空错误【英文标题】:Android: the bind value at index 1 is null error 【发布时间】:2015-06-19 14:42:50 【问题描述】:我正在开发一个应用程序,我在其中运行后台服务:
startService(new Intent(getApplicationContext(), ContactService.class));
在清单中:
<service android:name=".ContactService" ></service>
而服务代码如下:
public class ContactService extends Service
private int mContactCount;
@Override
public IBinder onBind(Intent arg0)
return null;
@Override
public void onCreate()
super.onCreate();
// Get contact count at start of service
mContactCount = getContactCount();
this.getContentResolver().registerContentObserver(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, true, mObserver);
Cursor curval = getApplicationContext().getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, null, null, null);
if (curval != null && curval.getCount() > 0)
curval.getCount();
curval.close();
private int getContactCount()
try
cursor = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, null, null, null);
if (cursor != null)
return cursor.getCount();
else
cursor.close();
return 0;
catch (Exception ignore)
finally
cursor.close();
return 0;
private ContentObserver mObserver = new ContentObserver(new Handler())
@Override
public void onChange(boolean selfChange)
new changeInContact().execute();
;
public class changeInContact extends AsyncTask<String, Void, String>
@Override
protected void onPreExecute()
super.onPreExecute();
@Override
protected String doInBackground(String... arg0)
ArrayList<Integer> arrayListContactID = new ArrayList<Integer>();
int currentCount = getContactCount();
// Add contact
if (currentCount > mContactCount)
// Adding the contact if max contact id from device to sqlite database
else if (currentCount < mContactCount)
// Delete contact from sqlite database which is not available in device
else if (currentCount == mContactCount)
// Check version of contact. If updated change info from device to sqlite
mContactCount = currentCount;
return "";
@Override
protected void onPostExecute(String result)
@Override
public int onStartCommand(Intent intent, int flags, int startId)
return Service.START_STICKY;
当我的服务在后台运行时,我收到错误并且我的应用程序崩溃。错误如下:
java.lang.RuntimeException: An error occured while executing doInBackground() at android.os.AsyncTask$3.done(AsyncTask.java:299)
at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
at java.util.concurrent.FutureTask.run(FutureTask.java:137)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
at java.lang.Thread.run(Thread.java:856)
Caused by: java.lang.IllegalArgumentException: the bind value at index 1 is null at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:170)
at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:140)
at android.content.ContentProviderProxy.query(ContentProviderNative.java:366)
at android.content.ContentResolver.query(ContentResolver.java:372)
at android.content.ContentResolver.query(ContentResolver.java:315)
at com.demo.example.ContactService$changeInContact.doInBackground(ContactService.java:577)
at com.demo.example.ContactService$changeInContact.doInBackground(ContactService.java:1)
at android.os.AsyncTask$2.call(AsyncTask.java:287)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
... 5 more
java.lang.IllegalArgumentException: the bind value at index 1 is null at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:170)
at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:140)
at android.content.ContentProviderProxy.query(ContentProviderNative.java:366)
at android.content.ContentResolver.query(ContentResolver.java:372)
at android.content.ContentResolver.query(ContentResolver.java:315)
at com.demo.example.ContactService$changeInContact.doInBackground(ContactService.java:577)
at com.demo.example.ContactService$changeInContact.doInBackground(ContactService.java:1)
at android.os.AsyncTask$2.call(AsyncTask.java:287)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
at java.util.concurrent.FutureTask.run(FutureTask.java:137)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
at java.lang.Thread.run(Thread.java:856)
我不明白出了什么问题。请向我提出您的宝贵建议。由于这个原因,我在我的应用程序中非常糟糕。请给我你的意见。
【问题讨论】:
ContactService.java:577 上有什么内容? 为什么onStartCommand在AsyncTask里面? @iago:那是拼写错误。如果异步任务,onStart 就退出了。立即查看更新。 @RohanKandwal ContactService 是我的后台服务。 选择争论为null时发生此错误,您是否可以确保每次执行该特定查询时null not null? span> 【参考方案1】:the bind value
只不过是query
的selectionArgs
。如果selectionArgs
在任何时候为空,您将在触发query
时收到此错误。
【讨论】:
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