Added google drive api

GoogleDriveApiClient.java

@@ -0,0 +1,108 @@
+
+
+
+public class GoogleDriveApiClient extends AppCompatActivity implements GoogleApiClient.OnConnectionFailedListener,GoogleApiClient.ConnectionCallbacks{
+
+
+			public GoogleApiClient mGoogleApiClient;
+			public static final int REQUEST_DRIVE_SIGNIN = 123;
+
+        	protected void onCreate(Bundle savedInstanceState) {
+        		super.onCreate(savedInstanceState);
+
+
+        		//create a api client to connect to drive
+        		mGoogleApiClient =   new GoogleApiClient.Builder(this)
+                					.addApi(Drive.API)
+					                .addScope(Drive.SCOPE_FILE)
+					                .addConnectionCallbacks(this)
+					                .addScope(Drive.SCOPE_APPFOLDER)
+					                .addOnConnectionFailedListener(this)
+					                .build();
+
+				//call to connect
+				mGoogleApiClient.connect();
+
+
+        	}
+
+        	 @Override
+		    public void onConnected(@Nullable Bundle bundle) {
+		    		//implement the code after connecting
+		    }
+
+		    @Override
+		    public void onConnectionSuspended(int i) {
+		        if(mGoogleApiClient!=null){
+		            mGoogleApiClient.disconnect();
+		        }
+
+		    }
+
+		    @Override
+		    public void onConnectionFailed(@NonNull ConnectionResult result) {
+		        if (!result.hasResolution()) {
+		            GoogleApiAvailability.getInstance().getErrorDialog(this, result.getErrorCode(), 0).show();
+		            return;
+		        }
+		        try {
+		        	//call for connection again
+		            result.startResolutionForResult(this, REQUEST_DRIVE_SIGNIN);
+		        } catch (Exception e) {
+		            e.printStackTrace();
+		        }
+		    }
+
+		    @Override
+		    protected void onActivityResult(final int requestCode, final int resultCode, final Intent data) {
+		        switch (requestCode) {
+
+		            case REQUEST_DRIVE_SIGNIN:
+
+		                if (resultCode == Activity.RESULT_OK) {
+
+		                    mGoogleApiClient.connect();
+
+		                }
+		                else if (resultCode == RESULT_CANCELED){
+
+		                    Log.d("TAG","result cancelled");
+		                    return ;
+		                }
+		                break;
+		            }
+		    }
+
+		     @Override
+		    protected void onPause() {
+		        super.onPause();
+		    }
+
+
+		    @Override
+		    protected void onResume() {
+
+		        super.onResume();
+		        if (mGoogleApiClient == null) {
+		            mGoogleApiClient = new GoogleApiClient.Builder(this)
+		                    .addApi(Drive.API)
+		                    .addScope(Drive.SCOPE_FILE)
+		                    .addConnectionCallbacks(this)
+		                    .addOnConnectionFailedListener(this)
+		                    .build();
+		            mGoogleApiClient.connect();
+		        }
+
+		    }
+
+		    @Override
+		    protected void onDestroy() {
+		        super.onDestroy();
+		        if ((mGoogleApiClient != null)&& (mGoogleApiClient.isConnected())){
+
+		            mGoogleApiClient.clearDefaultAccountAndReconnect();
+		            mGoogleApiClient.disconnect();
+		        }
+		    }
+}
+