Subversion Repositories SmartDukaan

/**

 * Copyright 2010-present Facebook.

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *    http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.facebook;

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.util.Log;

import android.view.View;

import com.facebook.android.R;

/**

 * This Activity is a necessary part of the overall Facebook login process

 * but is not meant to be used directly. Add this activity to your

 * AndroidManifest.xml to ensure proper handling of Facebook login.

 * <pre>

 * {@code

 * <activity android:name="com.facebook.LoginActivity"

 *           android:theme="@android:style/Theme.Translucent.NoTitleBar"

 *           android:label="@string/app_name" />

 * }

 * </pre>

 * Do not start this activity directly.

 */

public class LoginActivity extends Activity {

    static final String RESULT_KEY = "com.facebook.LoginActivity:Result";

    private static final String TAG = LoginActivity.class.getName();

    private static final String NULL_CALLING_PKG_ERROR_MSG =

            "Cannot call LoginActivity with a null calling package. " +

                    "This can occur if the launchMode of the caller is singleInstance.";

    private static final String SAVED_CALLING_PKG_KEY = "callingPackage";

    private static final String SAVED_AUTH_CLIENT = "authorizationClient";

    private static final String EXTRA_REQUEST = "request";

    private String callingPackage;

    private AuthorizationClient authorizationClient;

    private AuthorizationClient.AuthorizationRequest request;

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.com_facebook_login_activity_layout);

        if (savedInstanceState != null) {

            callingPackage = savedInstanceState.getString(SAVED_CALLING_PKG_KEY);

            authorizationClient = (AuthorizationClient) savedInstanceState.getSerializable(SAVED_AUTH_CLIENT);

        } else {

            callingPackage = getCallingPackage();

            authorizationClient = new AuthorizationClient();

            request = (AuthorizationClient.AuthorizationRequest) getIntent().getSerializableExtra(EXTRA_REQUEST);

        }

        authorizationClient.setContext(this);

        authorizationClient.setOnCompletedListener(new AuthorizationClient.OnCompletedListener() {

            @Override

            public void onCompleted(AuthorizationClient.Result outcome) {

                onAuthClientCompleted(outcome);

            }

        });

        authorizationClient.setBackgroundProcessingListener(new AuthorizationClient.BackgroundProcessingListener() {

            @Override

            public void onBackgroundProcessingStarted() {

                findViewById(R.id.com_facebook_login_activity_progress_bar).setVisibility(View.VISIBLE);

            }

            @Override

            public void onBackgroundProcessingStopped() {

                findViewById(R.id.com_facebook_login_activity_progress_bar).setVisibility(View.GONE);

            }

        });

    }

    private void onAuthClientCompleted(AuthorizationClient.Result outcome) {

        request = null;

        int resultCode = (outcome.code == AuthorizationClient.Result.Code.CANCEL) ?

                RESULT_CANCELED : RESULT_OK;

        Bundle bundle = new Bundle();

        bundle.putSerializable(RESULT_KEY, outcome);

        Intent resultIntent = new Intent();

        resultIntent.putExtras(bundle);

        setResult(resultCode, resultIntent);

        finish();

    }

    @Override

    public void onResume() {

        super.onResume();

        // If the calling package is null, this generally means that the callee was started

        // with a launchMode of singleInstance. Unfortunately, Android does not allow a result

        // to be set when the callee is a singleInstance, so we log an error and return.

        if (callingPackage == null) {

            Log.e(TAG, NULL_CALLING_PKG_ERROR_MSG);

            finish();

            return;

        }

        authorizationClient.startOrContinueAuth(request);

    }

    @Override

    public void onPause() {

        super.onPause();

        authorizationClient.cancelCurrentHandler();

        findViewById(R.id.com_facebook_login_activity_progress_bar).setVisibility(View.GONE);

    }

    @Override

    public void onSaveInstanceState(Bundle outState) {

        super.onSaveInstanceState(outState);

        outState.putString(SAVED_CALLING_PKG_KEY, callingPackage);

        outState.putSerializable(SAVED_AUTH_CLIENT, authorizationClient);

    }

    @Override

    protected void onActivityResult(int requestCode, int resultCode, Intent data) {

        authorizationClient.onActivityResult(requestCode, resultCode, data);

    }

    static Bundle populateIntentExtras(AuthorizationClient.AuthorizationRequest request) {

        Bundle extras = new Bundle();

        extras.putSerializable(EXTRA_REQUEST, request);

        return extras;

    }

}