src/com/android/settings/security/RequestManageCredentials.java - LeafOS-Project/android_packages_apps_Settings - Gitiles

 /*
  * Copyright (C) 2020 The Android Open Source Project
  *
  * 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.android.settings.security;

 import static android.view.WindowManager.LayoutParams.SYSTEM_FLAG_HIDE_NON_SYSTEM_OVERLAY_WINDOWS;

 import android.app.Activity;
 import android.app.admin.DevicePolicyEventLogger;
 import android.app.admin.DevicePolicyManager;
 import android.content.Context;
 import android.content.pm.ApplicationInfo;
 import android.content.pm.PackageManager;
 import android.content.pm.UserInfo;
 import android.content.res.Configuration;
 import android.net.Uri;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.HandlerThread;
 import android.os.Process;
 import android.os.RemoteException;
 import android.os.UserManager;
 import android.security.AppUriAuthenticationPolicy;
 import android.security.Credentials;
 import android.security.KeyChain;
 import android.stats.devicepolicy.DevicePolicyEnums;
 import android.text.TextUtils;
 import android.util.Log;
 import android.view.View;
 import android.widget.Button;
 import android.widget.ImageView;
 import android.widget.LinearLayout;
 import android.widget.TextView;

 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.annotation.VisibleForTesting;
 import androidx.recyclerview.widget.LinearLayoutManager;
 import androidx.recyclerview.widget.RecyclerView;

 import com.android.settings.R;

 import com.google.android.material.floatingactionbutton.ExtendedFloatingActionButton;

 import java.util.Map;

 /**
  * Displays a full screen to the user asking whether the calling app can manage the user's
  * KeyChain credentials. This screen includes the authentication policy highlighting what apps and
  * URLs the calling app can authenticate the user to.
  * <p>
  * Users can allow or deny the calling app. If denied, the calling app may re-request this
  * capability. If allowed, the calling app will become the credential management app and will be
  * able to manage the user's KeyChain credentials. The following APIs can be called to manage
  * KeyChain credentials:
  * {@link DevicePolicyManager#installKeyPair}
  * {@link DevicePolicyManager#removeKeyPair}
  * {@link DevicePolicyManager#generateKeyPair}
  * {@link DevicePolicyManager#setKeyPairCertificate}
  * <p>
  *
  * @see AppUriAuthenticationPolicy
  */
 public class RequestManageCredentials extends Activity {

     private static final String TAG = "ManageCredentials";

     private String mCredentialManagerPackage;
     private AppUriAuthenticationPolicy mAuthenticationPolicy;

     private RecyclerView mRecyclerView;
     private LinearLayoutManager mLayoutManager;
     private LinearLayout mButtonPanel;
     private ExtendedFloatingActionButton mExtendedFab;

     private HandlerThread mKeyChainTread;
     private KeyChain.KeyChainConnection mKeyChainConnection;

     private boolean mDisplayingButtonPanel = false;
     private boolean mIsLandscapeMode = false;

     @Override
     public void onCreate(@Nullable Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);

         if (!Credentials.ACTION_MANAGE_CREDENTIALS.equals(getIntent().getAction())) {
             Log.e(TAG, "Unable to start activity because intent action is not "
                     + Credentials.ACTION_MANAGE_CREDENTIALS);
             logRequestFailure();
             finishWithResultCancelled();
             return;
         }
         if (isManagedDevice()) {
             Log.e(TAG, "Credential management on managed devices should be done by the Device "
                     + "Policy Controller, not a credential management app");
             logRequestFailure();
             finishWithResultCancelled();
             return;
         }
         mCredentialManagerPackage = getLaunchedFromPackage();
         if (TextUtils.isEmpty(mCredentialManagerPackage)) {
             Log.e(TAG, "Unknown credential manager app");
             logRequestFailure();
             finishWithResultCancelled();
             return;
         }
         DevicePolicyEventLogger
                 .createEvent(DevicePolicyEnums.CREDENTIAL_MANAGEMENT_APP_REQUEST_NAME)
                 .setStrings(mCredentialManagerPackage)
                 .write();
         setContentView(R.layout.request_manage_credentials);
         getWindow().addSystemFlags(SYSTEM_FLAG_HIDE_NON_SYSTEM_OVERLAY_WINDOWS);
         mIsLandscapeMode = getResources().getConfiguration().orientation
                 == Configuration.ORIENTATION_LANDSCAPE;

         mKeyChainTread = new HandlerThread("KeyChainConnection");
         mKeyChainTread.start();
         mKeyChainConnection = getKeyChainConnection(this, mKeyChainTread);

         AppUriAuthenticationPolicy policy =
                 getIntent().getParcelableExtra(KeyChain.EXTRA_AUTHENTICATION_POLICY);
         if (!isValidAuthenticationPolicy(policy)) {
             Log.e(TAG, "Invalid authentication policy");
             logRequestFailure();
             finishWithResultCancelled();
             return;
         }
         mAuthenticationPolicy = policy;
         DevicePolicyEventLogger
                 .createEvent(DevicePolicyEnums.CREDENTIAL_MANAGEMENT_APP_REQUEST_POLICY)
                 .setStrings(getNumberOfAuthenticationPolicyApps(mAuthenticationPolicy),
                         getNumberOfAuthenticationPolicyUris(mAuthenticationPolicy))
                 .write();

         if (mIsLandscapeMode) {
             loadHeader();
         }
         loadRecyclerView();
         loadButtons();
         loadExtendedFloatingActionButton();
         addOnScrollListener();
     }

     @Override
     protected void onDestroy() {
         super.onDestroy();
         if (mKeyChainConnection != null) {
             mKeyChainConnection.close();
             mKeyChainConnection = null;
             mKeyChainTread.quitSafely();
         }
     }

     private boolean isValidAuthenticationPolicy(AppUriAuthenticationPolicy policy) {
         if (policy == null || policy.getAppAndUriMappings().isEmpty()) {
             return false;
         }
         try {
             // Check whether any of the aliases in the policy already exist
             for (String alias : policy.getAliases()) {
                 if (mKeyChainConnection.getService().requestPrivateKey(alias) != null) {
                     return false;
                 }
             }
         } catch (RemoteException e) {
             Log.e(TAG, "Invalid authentication policy", e);
             return false;
         }
         return true;
     }

     private boolean isManagedDevice() {
         DevicePolicyManager dpm = getSystemService(DevicePolicyManager.class);

         return dpm.getDeviceOwnerUser() != null
                 || dpm.getProfileOwner() != null
                 || hasManagedProfile();
     }

     private boolean hasManagedProfile() {
         UserManager um = getSystemService(UserManager.class);
         for (final UserInfo userInfo : um.getProfiles(getUserId())) {
             if (userInfo.isManagedProfile()) {
                 return true;
             }
         }
         return false;
     }

     private void loadRecyclerView() {
         mLayoutManager = new LinearLayoutManager(this);
         mRecyclerView = findViewById(R.id.apps_list);
         mRecyclerView.setLayoutManager(mLayoutManager);

         CredentialManagementAppAdapter recyclerViewAdapter = new CredentialManagementAppAdapter(
                 this, mCredentialManagerPackage, mAuthenticationPolicy.getAppAndUriMappings(),
                 /* include header= */ !mIsLandscapeMode, /* include expander= */ false);
         mRecyclerView.setAdapter(recyclerViewAdapter);
     }

     private void loadButtons() {
         mButtonPanel = findViewById(R.id.button_panel);
         Button dontAllowButton = findViewById(R.id.dont_allow_button);
         dontAllowButton.setFilterTouchesWhenObscured(true);
         Button allowButton = findViewById(R.id.allow_button);
         allowButton.setFilterTouchesWhenObscured(true);

         dontAllowButton.setOnClickListener(b -> {
             DevicePolicyEventLogger
                     .createEvent(DevicePolicyEnums.CREDENTIAL_MANAGEMENT_APP_REQUEST_DENIED)
                     .write();
             finishWithResultCancelled();
         });
         allowButton.setOnClickListener(b -> setOrUpdateCredentialManagementAppAndFinish());
     }

     private void loadExtendedFloatingActionButton() {
         mExtendedFab = findViewById(R.id.extended_fab);
         mExtendedFab.setOnClickListener(v -> {
             final int position = mIsLandscapeMode
                     ? mAuthenticationPolicy.getAppAndUriMappings().size() - 1
                     : mAuthenticationPolicy.getAppAndUriMappings().size();
             mRecyclerView.scrollToPosition(position);
             mExtendedFab.hide();
             showButtonPanel();
         });
     }

     private void loadHeader() {
         final ImageView mAppIconView = findViewById(R.id.credential_management_app_icon);
         final TextView mTitleView = findViewById(R.id.credential_management_app_title);
         try {
             ApplicationInfo applicationInfo =
                     getPackageManager().getApplicationInfo(mCredentialManagerPackage, 0);
             mAppIconView.setImageDrawable(getPackageManager().getApplicationIcon(applicationInfo));
             mTitleView.setText(TextUtils.expandTemplate(
                     getText(R.string.request_manage_credentials_title),
                     applicationInfo.loadLabel(getPackageManager())));
         } catch (PackageManager.NameNotFoundException e) {
             mAppIconView.setImageDrawable(null);
             mTitleView.setText(TextUtils.expandTemplate(
                     getText(R.string.request_manage_credentials_title),
                     mCredentialManagerPackage));
         }
     }

     private void setOrUpdateCredentialManagementAppAndFinish() {
         try {
             mKeyChainConnection.getService().setCredentialManagementApp(
                     mCredentialManagerPackage, mAuthenticationPolicy);
             DevicePolicyEventLogger
                     .createEvent(DevicePolicyEnums.CREDENTIAL_MANAGEMENT_APP_REQUEST_ACCEPTED)
                     .write();
             setResult(RESULT_OK);
         } catch (RemoteException e) {
             Log.e(TAG, "Unable to set credential manager app", e);
             logRequestFailure();
         }
         finish();
     }

     @VisibleForTesting
     KeyChain.KeyChainConnection getKeyChainConnection(Context context, HandlerThread thread) {
         final Handler handler = new Handler(thread.getLooper());
         try {
             KeyChain.KeyChainConnection connection = KeyChain.bindAsUser(
                     context, handler, Process.myUserHandle());
             return connection;
         } catch (InterruptedException e) {
             throw new RuntimeException("Faile to bind to KeyChain", e);
         }
     }

     private void addOnScrollListener() {
         mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
             @Override
             public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
                 super.onScrolled(recyclerView, dx, dy);
                 if (!mDisplayingButtonPanel) {
                     // On down scroll, hide text in floating action button by setting
                     // extended to false.
                     if (dy > 0 && mExtendedFab.getVisibility() == View.VISIBLE) {
                         mExtendedFab.shrink();
                     }
                     if (isRecyclerScrollable()) {
                         mExtendedFab.show();
                         hideButtonPanel();
                     } else {
                         mExtendedFab.hide();
                         showButtonPanel();
                     }
                 }
             }
         });
     }

     private void showButtonPanel() {
         // Add padding to remove overlap between recycler view and button panel.
         int padding_in_px = (int) (60 * getResources().getDisplayMetrics().density + 0.5f);
         mRecyclerView.setPadding(0, 0, 0, padding_in_px);
         mButtonPanel.setVisibility(View.VISIBLE);
         mDisplayingButtonPanel = true;
     }

     private void hideButtonPanel() {
         mRecyclerView.setPadding(0, 0, 0, 0);
         mButtonPanel.setVisibility(View.GONE);
     }

     private boolean isRecyclerScrollable() {
         if (mLayoutManager == null || mRecyclerView.getAdapter() == null) {
             return false;
         }
         return mLayoutManager.findLastCompletelyVisibleItemPosition()
                 < mRecyclerView.getAdapter().getItemCount() - 1;
     }

     private void finishWithResultCancelled() {
         setResult(RESULT_CANCELED);
         finish();
     }

     private void logRequestFailure() {
         DevicePolicyEventLogger
                 .createEvent(DevicePolicyEnums.CREDENTIAL_MANAGEMENT_APP_REQUEST_FAILED)
                 .write();
     }

     private String getNumberOfAuthenticationPolicyUris(AppUriAuthenticationPolicy policy) {
         int numberOfUris = 0;
         for (Map.Entry<String, Map<Uri, String>> appsToUris :
                 policy.getAppAndUriMappings().entrySet()) {
             numberOfUris += appsToUris.getValue().size();
         }
         return String.valueOf(numberOfUris);
     }

     private String getNumberOfAuthenticationPolicyApps(AppUriAuthenticationPolicy policy) {
         return String.valueOf(policy.getAppAndUriMappings().size());
     }

 }
	/*
	* Copyright (C) 2020 The Android Open Source Project
	*
	* 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.android.settings.security;

	import static android.view.WindowManager.LayoutParams.SYSTEM_FLAG_HIDE_NON_SYSTEM_OVERLAY_WINDOWS;

	import android.app.Activity;
	import android.app.admin.DevicePolicyEventLogger;
	import android.app.admin.DevicePolicyManager;
	import android.content.Context;
	import android.content.pm.ApplicationInfo;
	import android.content.pm.PackageManager;
	import android.content.pm.UserInfo;
	import android.content.res.Configuration;
	import android.net.Uri;
	import android.os.Bundle;
	import android.os.Handler;
	import android.os.HandlerThread;
	import android.os.Process;
	import android.os.RemoteException;
	import android.os.UserManager;
	import android.security.AppUriAuthenticationPolicy;
	import android.security.Credentials;
	import android.security.KeyChain;
	import android.stats.devicepolicy.DevicePolicyEnums;
	import android.text.TextUtils;
	import android.util.Log;
	import android.view.View;
	import android.widget.Button;
	import android.widget.ImageView;
	import android.widget.LinearLayout;
	import android.widget.TextView;

	import androidx.annotation.NonNull;
	import androidx.annotation.Nullable;
	import androidx.annotation.VisibleForTesting;
	import androidx.recyclerview.widget.LinearLayoutManager;
	import androidx.recyclerview.widget.RecyclerView;

	import com.android.settings.R;

	import com.google.android.material.floatingactionbutton.ExtendedFloatingActionButton;

	import java.util.Map;

	/**
	* Displays a full screen to the user asking whether the calling app can manage the user's
	* KeyChain credentials. This screen includes the authentication policy highlighting what apps and
	* URLs the calling app can authenticate the user to.
	* <p>
	* Users can allow or deny the calling app. If denied, the calling app may re-request this
	* capability. If allowed, the calling app will become the credential management app and will be
	* able to manage the user's KeyChain credentials. The following APIs can be called to manage
	* KeyChain credentials:
	* {@link DevicePolicyManager#installKeyPair}
	* {@link DevicePolicyManager#removeKeyPair}
	* {@link DevicePolicyManager#generateKeyPair}
	* {@link DevicePolicyManager#setKeyPairCertificate}
	* <p>
	*
	* @see AppUriAuthenticationPolicy
	*/
	public class RequestManageCredentials extends Activity {

	private static final String TAG = "ManageCredentials";

	private String mCredentialManagerPackage;
	private AppUriAuthenticationPolicy mAuthenticationPolicy;

	private RecyclerView mRecyclerView;
	private LinearLayoutManager mLayoutManager;
	private LinearLayout mButtonPanel;
	private ExtendedFloatingActionButton mExtendedFab;

	private HandlerThread mKeyChainTread;
	private KeyChain.KeyChainConnection mKeyChainConnection;

	private boolean mDisplayingButtonPanel = false;
	private boolean mIsLandscapeMode = false;

	@Override
	public void onCreate(@Nullable Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);

	if (!Credentials.ACTION_MANAGE_CREDENTIALS.equals(getIntent().getAction())) {
	Log.e(TAG, "Unable to start activity because intent action is not "
	+ Credentials.ACTION_MANAGE_CREDENTIALS);
	logRequestFailure();
	finishWithResultCancelled();
	return;
	}
	if (isManagedDevice()) {
	Log.e(TAG, "Credential management on managed devices should be done by the Device "
	+ "Policy Controller, not a credential management app");
	logRequestFailure();
	finishWithResultCancelled();
	return;
	}
	mCredentialManagerPackage = getLaunchedFromPackage();
	if (TextUtils.isEmpty(mCredentialManagerPackage)) {
	Log.e(TAG, "Unknown credential manager app");
	logRequestFailure();
	finishWithResultCancelled();
	return;
	}
	DevicePolicyEventLogger
	.createEvent(DevicePolicyEnums.CREDENTIAL_MANAGEMENT_APP_REQUEST_NAME)
	.setStrings(mCredentialManagerPackage)
	.write();
	setContentView(R.layout.request_manage_credentials);
	getWindow().addSystemFlags(SYSTEM_FLAG_HIDE_NON_SYSTEM_OVERLAY_WINDOWS);
	mIsLandscapeMode = getResources().getConfiguration().orientation
	== Configuration.ORIENTATION_LANDSCAPE;

	mKeyChainTread = new HandlerThread("KeyChainConnection");
	mKeyChainTread.start();
	mKeyChainConnection = getKeyChainConnection(this, mKeyChainTread);

	AppUriAuthenticationPolicy policy =
	getIntent().getParcelableExtra(KeyChain.EXTRA_AUTHENTICATION_POLICY);
	if (!isValidAuthenticationPolicy(policy)) {
	Log.e(TAG, "Invalid authentication policy");
	logRequestFailure();
	finishWithResultCancelled();
	return;
	}
	mAuthenticationPolicy = policy;
	DevicePolicyEventLogger
	.createEvent(DevicePolicyEnums.CREDENTIAL_MANAGEMENT_APP_REQUEST_POLICY)
	.setStrings(getNumberOfAuthenticationPolicyApps(mAuthenticationPolicy),
	getNumberOfAuthenticationPolicyUris(mAuthenticationPolicy))
	.write();

	if (mIsLandscapeMode) {
	loadHeader();
	}
	loadRecyclerView();
	loadButtons();
	loadExtendedFloatingActionButton();
	addOnScrollListener();
	}

	@Override
	protected void onDestroy() {
	super.onDestroy();
	if (mKeyChainConnection != null) {
	mKeyChainConnection.close();
	mKeyChainConnection = null;
	mKeyChainTread.quitSafely();
	}
	}

	private boolean isValidAuthenticationPolicy(AppUriAuthenticationPolicy policy) {
	if (policy == null \|\| policy.getAppAndUriMappings().isEmpty()) {
	return false;
	}
	try {
	// Check whether any of the aliases in the policy already exist
	for (String alias : policy.getAliases()) {
	if (mKeyChainConnection.getService().requestPrivateKey(alias) != null) {
	return false;
	}
	}
	} catch (RemoteException e) {
	Log.e(TAG, "Invalid authentication policy", e);
	return false;
	}
	return true;
	}

	private boolean isManagedDevice() {
	DevicePolicyManager dpm = getSystemService(DevicePolicyManager.class);

	return dpm.getDeviceOwnerUser() != null
	\|\| dpm.getProfileOwner() != null
	\|\| hasManagedProfile();
	}

	private boolean hasManagedProfile() {
	UserManager um = getSystemService(UserManager.class);
	for (final UserInfo userInfo : um.getProfiles(getUserId())) {
	if (userInfo.isManagedProfile()) {
	return true;
	}
	}
	return false;
	}

	private void loadRecyclerView() {
	mLayoutManager = new LinearLayoutManager(this);
	mRecyclerView = findViewById(R.id.apps_list);
	mRecyclerView.setLayoutManager(mLayoutManager);

	CredentialManagementAppAdapter recyclerViewAdapter = new CredentialManagementAppAdapter(
	this, mCredentialManagerPackage, mAuthenticationPolicy.getAppAndUriMappings(),
	/* include header= / !mIsLandscapeMode, / include expander= */ false);
	mRecyclerView.setAdapter(recyclerViewAdapter);
	}

	private void loadButtons() {
	mButtonPanel = findViewById(R.id.button_panel);
	Button dontAllowButton = findViewById(R.id.dont_allow_button);
	dontAllowButton.setFilterTouchesWhenObscured(true);
	Button allowButton = findViewById(R.id.allow_button);
	allowButton.setFilterTouchesWhenObscured(true);

	dontAllowButton.setOnClickListener(b -> {
	DevicePolicyEventLogger
	.createEvent(DevicePolicyEnums.CREDENTIAL_MANAGEMENT_APP_REQUEST_DENIED)
	.write();
	finishWithResultCancelled();
	});
	allowButton.setOnClickListener(b -> setOrUpdateCredentialManagementAppAndFinish());
	}

	private void loadExtendedFloatingActionButton() {
	mExtendedFab = findViewById(R.id.extended_fab);
	mExtendedFab.setOnClickListener(v -> {
	final int position = mIsLandscapeMode
	? mAuthenticationPolicy.getAppAndUriMappings().size() - 1
	: mAuthenticationPolicy.getAppAndUriMappings().size();
	mRecyclerView.scrollToPosition(position);
	mExtendedFab.hide();
	showButtonPanel();
	});
	}

	private void loadHeader() {
	final ImageView mAppIconView = findViewById(R.id.credential_management_app_icon);
	final TextView mTitleView = findViewById(R.id.credential_management_app_title);
	try {
	ApplicationInfo applicationInfo =
	getPackageManager().getApplicationInfo(mCredentialManagerPackage, 0);
	mAppIconView.setImageDrawable(getPackageManager().getApplicationIcon(applicationInfo));
	mTitleView.setText(TextUtils.expandTemplate(
	getText(R.string.request_manage_credentials_title),
	applicationInfo.loadLabel(getPackageManager())));
	} catch (PackageManager.NameNotFoundException e) {
	mAppIconView.setImageDrawable(null);
	mTitleView.setText(TextUtils.expandTemplate(
	getText(R.string.request_manage_credentials_title),
	mCredentialManagerPackage));
	}
	}

	private void setOrUpdateCredentialManagementAppAndFinish() {
	try {
	mKeyChainConnection.getService().setCredentialManagementApp(
	mCredentialManagerPackage, mAuthenticationPolicy);
	DevicePolicyEventLogger
	.createEvent(DevicePolicyEnums.CREDENTIAL_MANAGEMENT_APP_REQUEST_ACCEPTED)
	.write();
	setResult(RESULT_OK);
	} catch (RemoteException e) {
	Log.e(TAG, "Unable to set credential manager app", e);
	logRequestFailure();
	}
	finish();
	}

	@VisibleForTesting
	KeyChain.KeyChainConnection getKeyChainConnection(Context context, HandlerThread thread) {
	final Handler handler = new Handler(thread.getLooper());
	try {
	KeyChain.KeyChainConnection connection = KeyChain.bindAsUser(
	context, handler, Process.myUserHandle());
	return connection;
	} catch (InterruptedException e) {
	throw new RuntimeException("Faile to bind to KeyChain", e);
	}
	}

	private void addOnScrollListener() {
	mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
	@Override
	public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
	super.onScrolled(recyclerView, dx, dy);
	if (!mDisplayingButtonPanel) {
	// On down scroll, hide text in floating action button by setting
	// extended to false.
	if (dy > 0 && mExtendedFab.getVisibility() == View.VISIBLE) {
	mExtendedFab.shrink();
	}
	if (isRecyclerScrollable()) {
	mExtendedFab.show();
	hideButtonPanel();
	} else {
	mExtendedFab.hide();
	showButtonPanel();
	}
	}
	}
	});
	}

	private void showButtonPanel() {
	// Add padding to remove overlap between recycler view and button panel.
	int padding_in_px = (int) (60 * getResources().getDisplayMetrics().density + 0.5f);
	mRecyclerView.setPadding(0, 0, 0, padding_in_px);
	mButtonPanel.setVisibility(View.VISIBLE);
	mDisplayingButtonPanel = true;
	}

	private void hideButtonPanel() {
	mRecyclerView.setPadding(0, 0, 0, 0);
	mButtonPanel.setVisibility(View.GONE);
	}

	private boolean isRecyclerScrollable() {
	if (mLayoutManager == null \|\| mRecyclerView.getAdapter() == null) {
	return false;
	}
	return mLayoutManager.findLastCompletelyVisibleItemPosition()
	< mRecyclerView.getAdapter().getItemCount() - 1;
	}

	private void finishWithResultCancelled() {
	setResult(RESULT_CANCELED);
	finish();
	}

	private void logRequestFailure() {
	DevicePolicyEventLogger
	.createEvent(DevicePolicyEnums.CREDENTIAL_MANAGEMENT_APP_REQUEST_FAILED)
	.write();
	}

	private String getNumberOfAuthenticationPolicyUris(AppUriAuthenticationPolicy policy) {
	int numberOfUris = 0;
	for (Map.Entry<String, Map<Uri, String>> appsToUris :
	policy.getAppAndUriMappings().entrySet()) {
	numberOfUris += appsToUris.getValue().size();
	}
	return String.valueOf(numberOfUris);
	}

	private String getNumberOfAuthenticationPolicyApps(AppUriAuthenticationPolicy policy) {
	return String.valueOf(policy.getAppAndUriMappings().size());
	}

	}