android_备份还原通讯录

package cn.m15.helper.logic;
 
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
 
import android.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
import android.content.res.AssetFileDescriptor;
import android.database.Cursor;
import android.net.Uri;
import android.os.Environment;
import android.provider.ContactsContract;
 
public class ContactsSyncer extends Syncer {
 
    public void backup(Context context) {
        ContentResolver cr = context.getContentResolver();
        Cursor cur = cr.query(ContactsContract.Contacts.CONTENT_URI, null,
                null, null, null);
        int index = cur.getColumnIndex(ContactsContract.Contacts.LOOKUP_KEY);
        FileOutputStream fout;
        try {
            fout = new FileOutputStream(
                    Environment.getExternalStorageDirectory() + "/go.vcf");
            byte[] data = new byte[1024 * 1];
            while (cur.moveToNext()) {
                String lookupKey = cur.getString(index);
                Uri uri = Uri.withAppendedPath(
                        ContactsContract.Contacts.CONTENT_VCARD_URI, lookupKey);
                AssetFileDescriptor fd = context.getContentResolver()
                        .openAssetFileDescriptor(uri, "r");
                FileInputStream fin = fd.createInputStream();
                int len = -1;
                while ((len = fin.read(data)) != -1) {
                    fout.write(data, 0, len);
                }
                fin.close();
            }
            fout.close();
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
 
    public void restore(Context context, String filename) {
        Intent intent = new Intent();
        intent.setPackage("com.android.contacts");
        Uri uri = Uri.fromFile(new File(filename));
        intent.setAction(Intent.ACTION_VIEW);
        intent.setDataAndType(uri, "text/x-vcard");
        context.startActivity(intent);
    }
}
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