我正在使用Android 2.1平台。要做一个基于DropBox的项目。我使用DBUtility类来列出DropBox中的联系人。 DBUtility不是主类。它是一个子类.Main类从这个类中调用一些函数。
它运作良好，下面代码中的Createfolder（）只包含一个语句
mDBApi.createFolder（ “联系人”）;
如上所述没有错误。当我添加一些基于联系人的代码时。我得到了错误，如
“方法getContentResolver（）未定义类型DropBoxUtility”。
代码
public class DropBoxUtility {
private DropboxAPI<AndroidAuthSession> mDBApi;
public DropBoxUtility(DropboxAPI<AndroidAuthSession> Api) {
mDBApi = Api;
}
public void ContactFolder() throws DropboxException {
mDBApi.createFolder("Contacts");
ArrayAdapter<String>itemAdapter;
ArrayList<String> contactlist = new ArrayList<String>();
String displayName="All Contacts Here";
ByteArrayInputStream inputStream = new ByteArrayInputStream(displayName.getBytes());
Entry newEntry = mDBApi.putFile("Contacts/abhi.doc", inputStream, displayName.length(), null, null);
/* I got Error on this line */
ContentResolver cr = getContentResolver() ;
Cursor cursor = cr.query(ContactsContract.Contacts.CONTENT_URI, null, null, null, null);
while (cursor.moveToNext()) {
displayName = "";
displayName = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
String id = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts._ID));
String holder = "";
holder = holder + displayName;
/* Phone Number and Type */
ArrayList<String> phoneList = new ArrayList<String>();
if (Integer.parseInt(cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER))) > 0) {
Cursor pCur = cr.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, ContactsContract.CommonDataKinds.Phone.CONTACT_ID + " = ?", new String[] { id }, null);
while (pCur.moveToNext()) {
int phoneType = pCur
.getInt(pCur
.getColumnIndex(ContactsContract.CommonDataKinds.Phone.TYPE));
String pnum = pCur.getString(pCur
.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
switch (phoneType) {
case ContactsContract.CommonDataKinds.Phone.TYPE_HOME:
phoneList.add(", Home, "+pnum);
break;
case ContactsContract.CommonDataKinds.Phone.TYPE_WORK:
phoneList.add(", Work, "+pnum);
break;
case ContactsContract.CommonDataKinds.Phone.TYPE_MOBILE:
phoneList.add(", Mobile, "+pnum);
break;
case ContactsContract.CommonDataKinds.Phone.TYPE_OTHER:
phoneList.add(", Other, "+pnum);
break;
}
} // end of while
pCur.close();
} // end of if
/* Email */
Cursor emails = cr.query(Email.CONTENT_URI, null, Email.CONTACT_ID
+ " = " + id, null, null);
ArrayList<String> emailList = new ArrayList<String>();
while (emails.moveToNext()) {
int emailType = emails
.getInt(emails
.getColumnIndex(ContactsContract.CommonDataKinds.Email.TYPE));
String email = emails.getString(emails
.getColumnIndex(ContactsContract.CommonDataKinds.Email.DATA));
switch (emailType) {
case ContactsContract.CommonDataKinds.Email.TYPE_HOME:
emailList.add(", Home, "+email);
break;
case ContactsContract.CommonDataKinds.Email.TYPE_WORK:
emailList.add(", Work, "+email);
break;
case ContactsContract.CommonDataKinds.Email.TYPE_MOBILE:
emailList.add(", Mobile, "+email);
break;
case ContactsContract.CommonDataKinds.Email.TYPE_OTHER:
emailList.add(", Other, "+email);
break;
}
}
emails.close();
if(phoneList.size()>=emailList.size()) {
for(int i=0;i<phoneList.size();i++) {
holder = displayName + phoneList.get(i);
try{
holder = holder + emailList.get(i);
}catch(Exception ex){
holder = holder + ", , ";
}
contactlist.add(holder);
}
}else {
for(int i=0;i<emailList.size();i++) {
try{
holder = displayName+ phoneList.get(i);
}catch(Exception ex){
holder = holder + ", , ";
}
holder = holder + emailList.get(i);
contactlist.add(holder);
}
}
}
Collections.sort(contactlist);
cursor.close();
}
logcat的
07-05 14:57:54.734: W/dalvikvm(392): threadid=3: thread exiting with uncaught exception (group=0x4001b188)
07-05 14:57:54.734: E/AndroidRuntime(392): Uncaught handler: thread main exiting due to uncaught exception
07-05 14:57:54.744: E/AndroidRuntime(392): java.lang.SecurityException: Permission Denial: reading com.android.providers.contacts.ContactsProvider2 uri content://com.android.contacts/contacts from pid=392, uid=10028 requires android.permission.READ_CONTACTS
07-05 14:57:54.744: E/AndroidRuntime(392): at android.os.Parcel.readException(Parcel.java:1218)
07-05 14:57:54.744: E/AndroidRuntime(392): at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:160)
07-05 14:57:54.744: E/AndroidRuntime(392): at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:114)
07-05 14:57:54.744: E/AndroidRuntime(392): at android.content.ContentProviderProxy.bulkQuery(ContentProviderNative.java:326)
07-05 14:57:54.744: E/AndroidRuntime(392): at android.content.ContentProviderProxy.query(ContentProviderNative.java:345)
07-05 14:57:54.744: E/AndroidRuntime(392): at android.content.ContentResolver.query(ContentResolver.java:202)
07-05 14:57:54.744: E/AndroidRuntime(392): at com.abhi.DropBoxUtility.ContactFolder(DropBoxUtility.java:47)
如何解决这个问题？
答案 0 :(得分：1)
getContentResolver类中存在 Context方法。您可以直接从活动中调用它，因为Activity是一个Context。您的DropBoxUtility不是Activity，因此您需要在其中包含上下文才能使用getContentResolver方法。最简单的方法是将它传递给构造函数：
public class DropBoxUtility
{
private DropboxAPI<AndroidAuthSession> mDBApi;
private Context context;
public DropBoxUtility(DropboxAPI<AndroidAuthSession> Api, Context ctx)
{
mDBApi = Api;
context = ctx;
}
...
}
然后，当您需要拨打电话时，请使用context.getContentResolver()。
您可以将活动中的此类实例化为new DropBoxUtility(api, this);
编辑：要阅读联系信息，您需要为清单添加相应的权限：
<uses-permission android:name="android.permission.READ_CONTACTS"/>
答案 1 :(得分：0)
// I got Error on this line ContentResolver cr = getContentResolver() ;
我不知道 DropBox api ，但我肯定可以指出这个错误，getContentResolver()是android 活动类的方法而不是< strong> DropBoxUtility ，您可以使用此活动的上下文（参考）在不同的类中使用此方法。
将Android Activity的上下文传递给DropBoxUtility构造函数并使用该上下文 等，
ContentResolver cr = mContext.getContentResolver(); // Here mContext is a reference of your Activity class from which your are calling this DropBox class.
试试这个，
答案 2 :(得分：0)
类DropBoxUtility不会从任何提供getContentResolver方法的类（即Activity）继承。要么必须从另一个类派生类，要么必须声明并实现getContentResolver方法。
正如user370305所说，您可以将Activity的实例传递给DropBoxUtility类的构造函数，并在该实例上调用该方法。