Can't update contact details in android using code

I'm trying to update/change contact ringtone using this code:

ContentValues values = new ContentValues();
values.put(ContactsContract.Data.CUSTOM_RINGTONE, "D:/TempDownloads/BurpSounds/Alex.wav");

getContentResolver().update(ContactsContract.Contacts.CONTENT_URI, values , "DISPLAY_NAME = 'Ani'", null);

I get the message: " the application has stopped unexpectedly"

what is wrong with my code and how do I do it?

thanks

I managed to use logcat and ddms here is the log:

04-10 13:47:45.419: ERROR/AndroidRuntime(399): Caused by: java.lang.SecurityException: Permission Denial: writing com.android.providers.contacts.ContactsProvider2 uri content://com.android.contacts/contacts from pid=399, uid=10025 requires android.permission.WRITE_CONTACTS
04-10 13:47:45.419: ERROR/AndroidRuntime(399):     at android.os.Parcel.readException(Parcel.java:1218)
04-10 13:47:45.419: ERROR/AndroidRuntime(399):     at android.database.DatabaseUtils.readExceptionFromPar开发者_开发知识库cel(DatabaseUtils.java:160)
04-10 13:47:45.419: ERROR/AndroidRuntime(399):     at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:114)
04-10 13:47:45.419: ERROR/AndroidRuntime(399):     at android.content.ContentProviderProxy.update(ContentProviderNative.java:532)
04-10 13:47:45.419: ERROR/AndroidRuntime(399):     at android.content.ContentResolver.update(ContentResolver.java:737)
04-10 13:47:45.419: ERROR/AndroidRuntime(399):     at com.example.helloandroid.HelloAndroid.getContactList(HelloAndroid.java:36)
04-10 13:47:45.419: ERROR/AndroidRuntime(399):     at com.example.helloandroid.HelloAndroid.onCreate(HelloAndroid.java:19)
04-10 13:47:45.419: ERROR/AndroidRuntime(399):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
04-10 13:47:45.419: ERROR/AndroidRuntime(399):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2459)
04-10 13:47:45.419: ERROR/AndroidRuntime(399):     ... 11 more

the path I used: Environment.getExternalStorageDirectory().getPath() + "/Alex.wav"

First, you should use adb logcat, DDMS, or the DDMS perspective in Eclipse to examine the Java stack trace associated with "the application has stopped unexpectedly", so you can see what went wrong.

In this case, neither your Android phone nor your Android emulator will have a D: drive, since Android is not Windows.