Develop Reference

what is difference between import by package and import direct code in flutter

what is the difference between importing files by `package
import 'package:fileName/colorFile.dart';
and direct import
import 'fileName/colorFile.dart';

Cannot resolve symbol 'SCOPE_FILE'

I'm new to app development, and I'm working with Android Studio 3.1.4. I'm working with the Google APIs for sign-in, which have worked well when getting the user's ID, email address, and basic profile. However, I'm now trying to get the Google Drive API working, and I've been stuck for almost two days on this one nagging problem, which is the first step in getting this API to work. Here is the code that's being problematic.
GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
.requestEmail()
.requestScopes(Drive.SCOPE_FILE)
.build();
For some reason, SCOPE_FILE is showing up red and I get a tool tip that reads, "Cannot resolve symbol 'SCOPE_FILE'" when I hover over it. Based on everything that I've read, this should not be an issue. I've tried restarting Android Studio and my computer several times. I upgraded to the most recent version of Android Studio and the most recent version of Gradle. I'm pretty sure I've imported all the necessary classes, which are listed here:
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.TextView;
import com.google.android.gms.auth.api.signin.GoogleSignIn;
import com.google.android.gms.auth.api.signin.GoogleSignInAccount;
import com.google.android.gms.auth.api.signin.GoogleSignInClient;
import com.google.android.gms.auth.api.signin.GoogleSignInOptions;
import com.google.android.gms.common.api.ApiException;
import com.google.android.gms.common.api.Scope;
import com.google.api.services.drive.Drive;
import com.google.android.gms.tasks.Task;
import java.util.HashSet;
import java.util.Set;
I feel as though this must be a simple issue with a simple solution, but I can't figure it out. What am I missing?

The problem is that you are importing the wrong Drive class, which does not have the SCOPE_FILE field. The solution is to
import com.google.android.gms.drive.Drive;
instead of
import com.google.api.services.drive.Drive;

import this See
import com.google.android.gms.drive.Drive;

Why android.os.IServiceManager in Android not resolving

I am coding for DialerDemo, But import android.os.IServiceManager;import android.os.ServiceManagerNative; import android.telephony.IPhone; are not resolving
CODE:
package com.umesh.umeshfilereadwritedemo1;
import android.app.Activity;
import android.os.Bundle;
import android.os.DeadObjectException;
import android.os.IServiceManager;
import android.os.ServiceManagerNative;
import android.telephony.IPhone;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class DialerDemo extends Activity
{
...
...
}

These are all internal classes of the SDK, and are not available publicly.
You cannot build source.android.com applications on their own. They can only be built as part of a firmware image. Please follow the instructions to build the entire firmware. While you can use Eclipse to edit the firmware source, you will still use make to build the firmware.

java.lang.NoClassDefFoundError: oauth.signpost.commonshttp.CommonsHttpOAuthConsumer android

Am using twitter integration using SocialLib project. But the thing is constantly am getting
java.lang.NoClassDefFoundError: oauth.signpost.commonshttp.CommonsHttpOAuthConsumer
at the line
httpOauthConsumer = new CommonsHttpOAuthConsumer(consumerKey, consumerSecret);
and my imports are:
import oauth.signpost.commonshttp.CommonsHttpOAuthConsumer;
import oauth.signpost.commonshttp.CommonsHttpOAuthProvider;
import oauth.signpost.exception.OAuthCommunicationException;
import oauth.signpost.exception.OAuthExpectationFailedException;
import oauth.signpost.exception.OAuthMessageSignerException;
import oauth.signpost.exception.OAuthNotAuthorizedException;
and the jars i used and downloaded from:http://code.google.com/p/oauth-signpost/downloads/list
How to reslove this?
Hanks

Here is jarlibrary: http://code.google.com/p/oauth-signpost/downloads/detail?name=signpost-commonshttp4-1.2.1.1.jar&can=2&q= You should add it to your project as a external jar.

ADT import of android.media cannot be resolved

i try create my first android application for android 2.1 api level 7 in ADT. I wrote the following line to the default view and eclipse says, that android.media cannot be resolved:
import android.media;
how come, that this doesn't work?
thanks a lot

you cannot import android.media; because it is a package, try using:
import android.media.*;
or
import android.media.MediaPlayer; // if you want to import MediaPlayer
import android.media.Ringtone; // if you want to import Ringtone