MainActivity.java Source code

Introduction

Here is the source code for MainActivity.java

Source

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
import android.widget.Toast;

import com.google.android.gms.auth.api.Auth;
import com.google.android.gms.auth.api.signin.GoogleSignInAccount;
import com.google.android.gms.auth.api.signin.GoogleSignInOptions;
import com.google.android.gms.auth.api.signin.GoogleSignInResult;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;

public class MainActivity extends AppCompatActivity {

    private final int REQUEST_SIGN_IN = 1;
    GoogleApiClient mGoogleApiClient;

    GoogleApiClient.OnConnectionFailedListener mOnConnectionFailedListener = new GoogleApiClient.OnConnectionFailedListener() {
        @Override
        public void onConnectionFailed(ConnectionResult connectionResult) {
            Toast.makeText(MainActivity.this, "connectionResult=" + connectionResult.getErrorMessage(),
                    Toast.LENGTH_SHORT).show();
        }
    };

    GoogleApiClient.ConnectionCallbacks mConnectionCallbacks = new GoogleApiClient.ConnectionCallbacks() {
        @Override
        public void onConnected(Bundle bundle) {
            Toast.makeText(MainActivity.this, "onConnected()", Toast.LENGTH_SHORT).show();
        }

        @Override
        public void onConnectionSuspended(int i) {
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        GoogleSignInOptions googleSignInOptions = new GoogleSignInOptions.Builder(
                GoogleSignInOptions.DEFAULT_SIGN_IN).requestEmail().build();
        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addOnConnectionFailedListener(mOnConnectionFailedListener)
                .addConnectionCallbacks(mConnectionCallbacks).addApi(Auth.GOOGLE_SIGN_IN_API, googleSignInOptions)
                .build();
        findViewById(R.id.signInButton).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                signIn();
            }
        });
    }

    public void signIn() {
        Intent signInIntent = Auth.GoogleSignInApi.getSignInIntent(mGoogleApiClient);
        startActivityForResult(signInIntent, REQUEST_SIGN_IN);
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == REQUEST_SIGN_IN) {
            GoogleSignInResult googleSignInResult = Auth.GoogleSignInApi.getSignInResultFromIntent(data);
            if (googleSignInResult.isSuccess()) {
                GoogleSignInAccount googleSignInAccount = googleSignInResult.getSignInAccount();
                TextView textView = (TextView) findViewById(R.id.textView);
                textView.setText("Signed in: " + googleSignInAccount.getDisplayName());
                findViewById(R.id.signInButton).setVisibility(View.GONE);
            }
        }
    }

}