我想与联系人分开获取名字和姓氏。
但是当我使用以下过程时,程序出现运行时错误。
Unfortunately, XXX has stopped
问题出在哪里?
private void PrintContacts(Cursor c){
if(c.moveToFirst()){
do{
String contactID = c.getString(c.getColumnIndex(ContactsContract.Contacts._ID));
String contactGivenName = c.getString(c.getColumnIndex(ContactsContract.CommonDataKinds.StructuredName.GIVEN_NAME));
Toast.makeText(this, contactGivenName, Toast.LENGTH_SHORT).show();
}while(c.moveToNext());
}
}
日志错误:
08-17 12:02:43.750: ERROR/AndroidRuntime(21049): FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.mhb.Provider/com.mhb.Provider.MainActivity}: java.lang.IllegalStateException: Couldn't read row 0, col -1 from CursorWindow. Make sure the Cursor is initialized correctly before accessing data from it.
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2110)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2135)
at android.app.ActivityThread.access$700(ActivityThread.java:140)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1237)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4921)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1027)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:794)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.IllegalStateException: Couldn't read row 0, col -1 from CursorWindow. Make sure the Cursor is initialized correctly before accessing data from it.
at android.database.CursorWindow.nativeGetString(Native Method)
at android.database.CursorWindow.getString(CursorWindow.java:438)
at android.database.AbstractWindowedCursor.getString(AbstractWindowedCursor.java:51)
at android.database.CursorWrapper.getString(CursorWrapper.java:114)
at com.mhb.Provider.MainActivity.PrintContacts(MainActivity.java:62)
at com.mhb.Provider.MainActivity.onCreate(MainActivity.java:54)
at android.app.Activity.performCreate(Activity.java:5206)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1094)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2074)
... 11 more
-------------------------------------------------- -----
代码的其他部分:
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Uri allContacts = ContactsContract.Contacts.CONTENT_URI;
Cursor c;
if (android.os.Build.VERSION.SDK_INT <11) {
c = managedQuery(allContacts, null, null, null, null);
} else {
CursorLoader cursorLoader = new CursorLoader(this, allContacts, null, null, null, null);
c = cursorLoader.loadInBackground();
}
String[] columns = new String[] {
ContactsContract.Contacts.DISPLAY_NAME,
ContactsContract.Contacts._ID
};
int[] views = new int[] {R.id.contactName, R.id.contactID};
SimpleCursorAdapter adapter;
if(Build.VERSION.SDK_INT <11){
adapter = new SimpleCursorAdapter(this, R.layout.main, c, columns, views);
} else {
adapter = new SimpleCursorAdapter(this, R.layout.main, c, columns, views,
CursorAdapter.FLAG_REGISTER_CONTENT_OBSERVER);
}
this.setListAdapter(adapter);
PrintContacts(c);
}