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

 /*
  * Copyright (C) 2016 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;

 import android.annotation.NonNull;
 import android.app.Activity;
 import android.app.admin.DevicePolicyManager;
 import android.content.DialogInterface;
 import android.content.pm.UserInfo;
 import android.net.http.SslCertificate;
 import android.os.UserHandle;
 import android.os.UserManager;
 import android.view.View;
 import android.view.animation.AnimationUtils;
 import android.widget.AdapterView;
 import android.widget.ArrayAdapter;
 import android.widget.Button;
 import android.widget.LinearLayout;
 import android.widget.Spinner;

 import androidx.appcompat.app.AlertDialog;

 import com.android.internal.widget.LockPatternUtils;
 import com.android.settings.TrustedCredentialsFragment.CertHolder;
 import com.android.settingslib.RestrictedLockUtils;

 import java.security.cert.X509Certificate;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.function.IntConsumer;

 class TrustedCredentialsDialogBuilder extends AlertDialog.Builder {
     public interface DelegateInterface {
         List<X509Certificate> getX509CertsFromCertHolder(CertHolder certHolder);
         void removeOrInstallCert(CertHolder certHolder);
         boolean startConfirmCredentialIfNotConfirmed(int userId,
                 IntConsumer onCredentialConfirmedListener);
     }

     private final DialogEventHandler mDialogEventHandler;

     public TrustedCredentialsDialogBuilder(Activity activity, DelegateInterface delegate) {
         super(activity);
         mDialogEventHandler = new DialogEventHandler(activity, delegate);

         initDefaultBuilderParams();
     }

     public TrustedCredentialsDialogBuilder setCertHolder(CertHolder certHolder) {
         return setCertHolders(certHolder == null ? new CertHolder[0]
                 : new CertHolder[]{certHolder});
     }

     public TrustedCredentialsDialogBuilder setCertHolders(@NonNull CertHolder[] certHolders) {
         mDialogEventHandler.setCertHolders(certHolders);
         return this;
     }

     @Override
     public AlertDialog create() {
         AlertDialog dialog = super.create();
         dialog.setOnShowListener(mDialogEventHandler);
         mDialogEventHandler.setDialog(dialog);
         return dialog;
     }

     private void initDefaultBuilderParams() {
         setTitle(com.android.internal.R.string.ssl_certificate);
         setView(mDialogEventHandler.mRootContainer);

         // Enable buttons here. The actual labels and listeners are configured in nextOrDismiss
         setPositiveButton(R.string.trusted_credentials_trust_label, null);
         setNegativeButton(android.R.string.ok, null);
     }

     private static class DialogEventHandler implements DialogInterface.OnShowListener,
             View.OnClickListener  {
         private static final long OUT_DURATION_MS = 300;
         private static final long IN_DURATION_MS = 200;

         private final Activity mActivity;
         private final DevicePolicyManager mDpm;
         private final UserManager mUserManager;
         private final DelegateInterface mDelegate;
         private final LinearLayout mRootContainer;

         private int mCurrentCertIndex = -1;
         private AlertDialog mDialog;
         private Button mPositiveButton;
         private Button mNegativeButton;
         private boolean mNeedsApproval;
         private CertHolder[] mCertHolders = new CertHolder[0];
         private View mCurrentCertLayout = null;

         public DialogEventHandler(Activity activity, DelegateInterface delegate) {
             mActivity = activity;
             mDpm = activity.getSystemService(DevicePolicyManager.class);
             mUserManager = activity.getSystemService(UserManager.class);
             mDelegate = delegate;

             mRootContainer = new LinearLayout(mActivity);
             mRootContainer.setOrientation(LinearLayout.VERTICAL);
         }

         public void setDialog(AlertDialog dialog) {
             mDialog = dialog;
         }

         public void setCertHolders(CertHolder[] certHolder) {
             mCertHolders = certHolder;
         }

         @Override
         public void onShow(DialogInterface dialogInterface) {
             // Config the display content only when the dialog is shown because the
             // positive/negative buttons don't exist until the dialog is shown
             nextOrDismiss();
         }

         @Override
         public void onClick(View view) {
             if (view == mPositiveButton) {
                 if (mNeedsApproval) {
                     onClickTrust();
                 } else {
                     onClickOk();
                 }
             } else if (view == mNegativeButton) {
                 onClickEnableOrDisable();
             }
         }

         private void onClickOk() {
             nextOrDismiss();
         }

         private void onClickTrust() {
             CertHolder certHolder = getCurrentCertInfo();
             if (!mDelegate.startConfirmCredentialIfNotConfirmed(certHolder.getUserId(),
                     this::onCredentialConfirmed)) {
                 mDpm.approveCaCert(certHolder.getAlias(), certHolder.getUserId(), true);
                 nextOrDismiss();
             }
         }

         private void onClickEnableOrDisable() {
             final CertHolder certHolder = getCurrentCertInfo();
             DialogInterface.OnClickListener onConfirm = new DialogInterface.OnClickListener() {
                 @Override
                 public void onClick(DialogInterface dialog, int id) {
                     mDelegate.removeOrInstallCert(certHolder);
                     nextOrDismiss();
                 }
             };
             if (certHolder.isSystemCert()) {
                 // Removing system certs is reversible, so skip confirmation.
                 onConfirm.onClick(null, -1);
             } else {
                 new AlertDialog.Builder(mActivity)
                         .setMessage(R.string.trusted_credentials_remove_confirmation)
                         .setPositiveButton(android.R.string.ok, onConfirm)
                         .setNegativeButton(android.R.string.cancel, null)
                         .show();

             }
         }

         private void onCredentialConfirmed(int userId) {
             if (mDialog.isShowing() && mNeedsApproval && getCurrentCertInfo() != null
                     && getCurrentCertInfo().getUserId() == userId) {
                 // Treat it as user just clicks "trust" for this cert
                 onClickTrust();
             }
         }

         private CertHolder getCurrentCertInfo() {
             return mCurrentCertIndex < mCertHolders.length ? mCertHolders[mCurrentCertIndex] : null;
         }

         private void nextOrDismiss() {
             mCurrentCertIndex++;
             // find next non-null cert or dismiss
             while (mCurrentCertIndex < mCertHolders.length && getCurrentCertInfo() == null) {
                 mCurrentCertIndex++;
             }

             if (mCurrentCertIndex >= mCertHolders.length) {
                 mDialog.dismiss();
                 return;
             }

             updateViewContainer();
             updatePositiveButton();
             updateNegativeButton();
         }

         /**
          * @return true if current user or parent user is guarded by screenlock
          */
         private boolean isUserSecure(int userId) {
             final LockPatternUtils lockPatternUtils = new LockPatternUtils(mActivity);
             if (lockPatternUtils.isSecure(userId)) {
                 return true;
             }
             UserInfo parentUser = mUserManager.getProfileParent(userId);
             if (parentUser == null) {
                 return false;
             }
             return lockPatternUtils.isSecure(parentUser.id);
         }

         private void updatePositiveButton() {
             final CertHolder certHolder = getCurrentCertInfo();
             mNeedsApproval = !certHolder.isSystemCert()
                     && isUserSecure(certHolder.getUserId())
                     && !mDpm.isCaCertApproved(certHolder.getAlias(), certHolder.getUserId());

             final boolean isProfileOrDeviceOwner = RestrictedLockUtils.getProfileOrDeviceOwner(
                     mActivity, UserHandle.of(certHolder.getUserId())) != null;

             // Show trust button only when it requires consumer user (non-PO/DO) to approve
             CharSequence displayText = mActivity.getText(!isProfileOrDeviceOwner && mNeedsApproval
                     ? R.string.trusted_credentials_trust_label
                     : android.R.string.ok);
             mPositiveButton = updateButton(DialogInterface.BUTTON_POSITIVE, displayText);
         }

         private void updateNegativeButton() {
             final CertHolder certHolder = getCurrentCertInfo();
             final boolean showRemoveButton = !mUserManager.hasUserRestriction(
                     UserManager.DISALLOW_CONFIG_CREDENTIALS,
                     new UserHandle(certHolder.getUserId()));
             CharSequence displayText = mActivity.getText(getButtonLabel(certHolder));
             mNegativeButton = updateButton(DialogInterface.BUTTON_NEGATIVE, displayText);
             mNegativeButton.setVisibility(showRemoveButton ? View.VISIBLE : View.GONE);
         }

         /**
          * mDialog.setButton doesn't trigger text refresh since mDialog has been shown.
          * It's invoked only in case mDialog is refreshed.
          * setOnClickListener is invoked to avoid dismiss dialog onClick
          */
         private Button updateButton(int buttonType, CharSequence displayText) {
             mDialog.setButton(buttonType, displayText, (DialogInterface.OnClickListener) null);
             Button button = mDialog.getButton(buttonType);
             button.setText(displayText);
             button.setOnClickListener(this);
             return button;
         }


         private void updateViewContainer() {
             CertHolder certHolder = getCurrentCertInfo();
             LinearLayout nextCertLayout = getCertLayout(certHolder);

             // Displaying first cert doesn't require animation
             if (mCurrentCertLayout == null) {
                 mCurrentCertLayout = nextCertLayout;
                 mRootContainer.addView(mCurrentCertLayout);
             } else {
                 animateViewTransition(nextCertLayout);
             }
         }

         private LinearLayout getCertLayout(final CertHolder certHolder) {
             final ArrayList<View> views =  new ArrayList<View>();
             final ArrayList<String> titles = new ArrayList<String>();
             List<X509Certificate> certificates = mDelegate.getX509CertsFromCertHolder(certHolder);
             if (certificates != null) {
                 for (X509Certificate certificate : certificates) {
                     SslCertificate sslCert = new SslCertificate(certificate);
                     views.add(sslCert.inflateCertificateView(mActivity));
                     titles.add(sslCert.getIssuedTo().getCName());
                 }
             }

             ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(mActivity,
                     android.R.layout.simple_spinner_item,
                     titles);
             arrayAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
             Spinner spinner = new Spinner(mActivity);
             spinner.setAdapter(arrayAdapter);
             spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
                 @Override
                 public void onItemSelected(AdapterView<?> parent, View view, int position,
                         long id) {
                     for (int i = 0; i < views.size(); i++) {
                         views.get(i).setVisibility(i == position ? View.VISIBLE : View.GONE);
                     }
                 }

                 @Override
                 public void onNothingSelected(AdapterView<?> parent) {
                 }
             });

             LinearLayout certLayout = new LinearLayout(mActivity);
             certLayout.setOrientation(LinearLayout.VERTICAL);
             // Prevent content overlapping with spinner
             certLayout.setClipChildren(true);
             certLayout.addView(spinner);
             for (int i = 0; i < views.size(); ++i) {
                 View certificateView = views.get(i);
                 // Show first cert by default
                 certificateView.setVisibility(i == 0 ? View.VISIBLE : View.GONE);
                 certLayout.addView(certificateView);
             }

             return certLayout;
         }

         private static int getButtonLabel(CertHolder certHolder) {
             return certHolder.isSystemCert() ? ( certHolder.isDeleted()
                         ? R.string.trusted_credentials_enable_label
                         : R.string.trusted_credentials_disable_label )
                     : R.string.trusted_credentials_remove_label;
         }

         /* Animation code */
         private void animateViewTransition(final View nextCertView) {
             animateOldContent(new Runnable() {
                 @Override
                 public void run() {
                     addAndAnimateNewContent(nextCertView);
                 }
             });
         }

         private void animateOldContent(Runnable callback) {
             // Fade out
             mCurrentCertLayout.animate()
                     .alpha(0)
                     .setDuration(OUT_DURATION_MS)
                     .setInterpolator(AnimationUtils.loadInterpolator(mActivity,
                             android.R.interpolator.fast_out_linear_in))
                     .withEndAction(callback)
                     .start();
         }

         private void addAndAnimateNewContent(View nextCertLayout) {
             mCurrentCertLayout = nextCertLayout;
             mRootContainer.removeAllViews();
             mRootContainer.addView(nextCertLayout);

             mRootContainer.addOnLayoutChangeListener( new View.OnLayoutChangeListener() {
                 @Override
                 public void onLayoutChange(View v, int left, int top, int right, int bottom,
                         int oldLeft, int oldTop, int oldRight, int oldBottom) {
                     mRootContainer.removeOnLayoutChangeListener(this);

                     // Animate slide in from the right
                     final int containerWidth = mRootContainer.getWidth();
                     mCurrentCertLayout.setTranslationX(containerWidth);
                     mCurrentCertLayout.animate()
                             .translationX(0)
                             .setInterpolator(AnimationUtils.loadInterpolator(mActivity,
                                     android.R.interpolator.linear_out_slow_in))
                             .setDuration(IN_DURATION_MS)
                             .start();
                 }
             });
         }
     }
 }
	/*
	* Copyright (C) 2016 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;

	import android.annotation.NonNull;
	import android.app.Activity;
	import android.app.admin.DevicePolicyManager;
	import android.content.DialogInterface;
	import android.content.pm.UserInfo;
	import android.net.http.SslCertificate;
	import android.os.UserHandle;
	import android.os.UserManager;
	import android.view.View;
	import android.view.animation.AnimationUtils;
	import android.widget.AdapterView;
	import android.widget.ArrayAdapter;
	import android.widget.Button;
	import android.widget.LinearLayout;
	import android.widget.Spinner;

	import androidx.appcompat.app.AlertDialog;

	import com.android.internal.widget.LockPatternUtils;
	import com.android.settings.TrustedCredentialsFragment.CertHolder;
	import com.android.settingslib.RestrictedLockUtils;

	import java.security.cert.X509Certificate;
	import java.util.ArrayList;
	import java.util.List;
	import java.util.function.IntConsumer;

	class TrustedCredentialsDialogBuilder extends AlertDialog.Builder {
	public interface DelegateInterface {
	List<X509Certificate> getX509CertsFromCertHolder(CertHolder certHolder);
	void removeOrInstallCert(CertHolder certHolder);
	boolean startConfirmCredentialIfNotConfirmed(int userId,
	IntConsumer onCredentialConfirmedListener);
	}

	private final DialogEventHandler mDialogEventHandler;

	public TrustedCredentialsDialogBuilder(Activity activity, DelegateInterface delegate) {
	super(activity);
	mDialogEventHandler = new DialogEventHandler(activity, delegate);

	initDefaultBuilderParams();
	}

	public TrustedCredentialsDialogBuilder setCertHolder(CertHolder certHolder) {
	return setCertHolders(certHolder == null ? new CertHolder[0]
	: new CertHolder[]{certHolder});
	}

	public TrustedCredentialsDialogBuilder setCertHolders(@NonNull CertHolder[] certHolders) {
	mDialogEventHandler.setCertHolders(certHolders);
	return this;
	}

	@Override
	public AlertDialog create() {
	AlertDialog dialog = super.create();
	dialog.setOnShowListener(mDialogEventHandler);
	mDialogEventHandler.setDialog(dialog);
	return dialog;
	}

	private void initDefaultBuilderParams() {
	setTitle(com.android.internal.R.string.ssl_certificate);
	setView(mDialogEventHandler.mRootContainer);

	// Enable buttons here. The actual labels and listeners are configured in nextOrDismiss
	setPositiveButton(R.string.trusted_credentials_trust_label, null);
	setNegativeButton(android.R.string.ok, null);
	}

	private static class DialogEventHandler implements DialogInterface.OnShowListener,
	View.OnClickListener {
	private static final long OUT_DURATION_MS = 300;
	private static final long IN_DURATION_MS = 200;

	private final Activity mActivity;
	private final DevicePolicyManager mDpm;
	private final UserManager mUserManager;
	private final DelegateInterface mDelegate;
	private final LinearLayout mRootContainer;

	private int mCurrentCertIndex = -1;
	private AlertDialog mDialog;
	private Button mPositiveButton;
	private Button mNegativeButton;
	private boolean mNeedsApproval;
	private CertHolder[] mCertHolders = new CertHolder[0];
	private View mCurrentCertLayout = null;

	public DialogEventHandler(Activity activity, DelegateInterface delegate) {
	mActivity = activity;
	mDpm = activity.getSystemService(DevicePolicyManager.class);
	mUserManager = activity.getSystemService(UserManager.class);
	mDelegate = delegate;

	mRootContainer = new LinearLayout(mActivity);
	mRootContainer.setOrientation(LinearLayout.VERTICAL);
	}

	public void setDialog(AlertDialog dialog) {
	mDialog = dialog;
	}

	public void setCertHolders(CertHolder[] certHolder) {
	mCertHolders = certHolder;
	}

	@Override
	public void onShow(DialogInterface dialogInterface) {
	// Config the display content only when the dialog is shown because the
	// positive/negative buttons don't exist until the dialog is shown
	nextOrDismiss();
	}

	@Override
	public void onClick(View view) {
	if (view == mPositiveButton) {
	if (mNeedsApproval) {
	onClickTrust();
	} else {
	onClickOk();
	}
	} else if (view == mNegativeButton) {
	onClickEnableOrDisable();
	}
	}

	private void onClickOk() {
	nextOrDismiss();
	}

	private void onClickTrust() {
	CertHolder certHolder = getCurrentCertInfo();
	if (!mDelegate.startConfirmCredentialIfNotConfirmed(certHolder.getUserId(),
	this::onCredentialConfirmed)) {
	mDpm.approveCaCert(certHolder.getAlias(), certHolder.getUserId(), true);
	nextOrDismiss();
	}
	}

	private void onClickEnableOrDisable() {
	final CertHolder certHolder = getCurrentCertInfo();
	DialogInterface.OnClickListener onConfirm = new DialogInterface.OnClickListener() {
	@Override
	public void onClick(DialogInterface dialog, int id) {
	mDelegate.removeOrInstallCert(certHolder);
	nextOrDismiss();
	}
	};
	if (certHolder.isSystemCert()) {
	// Removing system certs is reversible, so skip confirmation.
	onConfirm.onClick(null, -1);
	} else {
	new AlertDialog.Builder(mActivity)
	.setMessage(R.string.trusted_credentials_remove_confirmation)
	.setPositiveButton(android.R.string.ok, onConfirm)
	.setNegativeButton(android.R.string.cancel, null)
	.show();

	}
	}

	private void onCredentialConfirmed(int userId) {
	if (mDialog.isShowing() && mNeedsApproval && getCurrentCertInfo() != null
	&& getCurrentCertInfo().getUserId() == userId) {
	// Treat it as user just clicks "trust" for this cert
	onClickTrust();
	}
	}

	private CertHolder getCurrentCertInfo() {
	return mCurrentCertIndex < mCertHolders.length ? mCertHolders[mCurrentCertIndex] : null;
	}

	private void nextOrDismiss() {
	mCurrentCertIndex++;
	// find next non-null cert or dismiss
	while (mCurrentCertIndex < mCertHolders.length && getCurrentCertInfo() == null) {
	mCurrentCertIndex++;
	}

	if (mCurrentCertIndex >= mCertHolders.length) {
	mDialog.dismiss();
	return;
	}

	updateViewContainer();
	updatePositiveButton();
	updateNegativeButton();
	}

	/**
	* @return true if current user or parent user is guarded by screenlock
	*/
	private boolean isUserSecure(int userId) {
	final LockPatternUtils lockPatternUtils = new LockPatternUtils(mActivity);
	if (lockPatternUtils.isSecure(userId)) {
	return true;
	}
	UserInfo parentUser = mUserManager.getProfileParent(userId);
	if (parentUser == null) {
	return false;
	}
	return lockPatternUtils.isSecure(parentUser.id);
	}

	private void updatePositiveButton() {
	final CertHolder certHolder = getCurrentCertInfo();
	mNeedsApproval = !certHolder.isSystemCert()
	&& isUserSecure(certHolder.getUserId())
	&& !mDpm.isCaCertApproved(certHolder.getAlias(), certHolder.getUserId());

	final boolean isProfileOrDeviceOwner = RestrictedLockUtils.getProfileOrDeviceOwner(
	mActivity, UserHandle.of(certHolder.getUserId())) != null;

	// Show trust button only when it requires consumer user (non-PO/DO) to approve
	CharSequence displayText = mActivity.getText(!isProfileOrDeviceOwner && mNeedsApproval
	? R.string.trusted_credentials_trust_label
	: android.R.string.ok);
	mPositiveButton = updateButton(DialogInterface.BUTTON_POSITIVE, displayText);
	}

	private void updateNegativeButton() {
	final CertHolder certHolder = getCurrentCertInfo();
	final boolean showRemoveButton = !mUserManager.hasUserRestriction(
	UserManager.DISALLOW_CONFIG_CREDENTIALS,
	new UserHandle(certHolder.getUserId()));
	CharSequence displayText = mActivity.getText(getButtonLabel(certHolder));
	mNegativeButton = updateButton(DialogInterface.BUTTON_NEGATIVE, displayText);
	mNegativeButton.setVisibility(showRemoveButton ? View.VISIBLE : View.GONE);
	}

	/**
	* mDialog.setButton doesn't trigger text refresh since mDialog has been shown.
	* It's invoked only in case mDialog is refreshed.
	* setOnClickListener is invoked to avoid dismiss dialog onClick
	*/
	private Button updateButton(int buttonType, CharSequence displayText) {
	mDialog.setButton(buttonType, displayText, (DialogInterface.OnClickListener) null);
	Button button = mDialog.getButton(buttonType);
	button.setText(displayText);
	button.setOnClickListener(this);
	return button;
	}


	private void updateViewContainer() {
	CertHolder certHolder = getCurrentCertInfo();
	LinearLayout nextCertLayout = getCertLayout(certHolder);

	// Displaying first cert doesn't require animation
	if (mCurrentCertLayout == null) {
	mCurrentCertLayout = nextCertLayout;
	mRootContainer.addView(mCurrentCertLayout);
	} else {
	animateViewTransition(nextCertLayout);
	}
	}

	private LinearLayout getCertLayout(final CertHolder certHolder) {
	final ArrayList<View> views = new ArrayList<View>();
	final ArrayList<String> titles = new ArrayList<String>();
	List<X509Certificate> certificates = mDelegate.getX509CertsFromCertHolder(certHolder);
	if (certificates != null) {
	for (X509Certificate certificate : certificates) {
	SslCertificate sslCert = new SslCertificate(certificate);
	views.add(sslCert.inflateCertificateView(mActivity));
	titles.add(sslCert.getIssuedTo().getCName());
	}
	}

	ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(mActivity,
	android.R.layout.simple_spinner_item,
	titles);
	arrayAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
	Spinner spinner = new Spinner(mActivity);
	spinner.setAdapter(arrayAdapter);
	spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
	@Override
	public void onItemSelected(AdapterView<?> parent, View view, int position,
	long id) {
	for (int i = 0; i < views.size(); i++) {
	views.get(i).setVisibility(i == position ? View.VISIBLE : View.GONE);
	}
	}

	@Override
	public void onNothingSelected(AdapterView<?> parent) {
	}
	});

	LinearLayout certLayout = new LinearLayout(mActivity);
	certLayout.setOrientation(LinearLayout.VERTICAL);
	// Prevent content overlapping with spinner
	certLayout.setClipChildren(true);
	certLayout.addView(spinner);
	for (int i = 0; i < views.size(); ++i) {
	View certificateView = views.get(i);
	// Show first cert by default
	certificateView.setVisibility(i == 0 ? View.VISIBLE : View.GONE);
	certLayout.addView(certificateView);
	}

	return certLayout;
	}

	private static int getButtonLabel(CertHolder certHolder) {
	return certHolder.isSystemCert() ? ( certHolder.isDeleted()
	? R.string.trusted_credentials_enable_label
	: R.string.trusted_credentials_disable_label )
	: R.string.trusted_credentials_remove_label;
	}

	/* Animation code */
	private void animateViewTransition(final View nextCertView) {
	animateOldContent(new Runnable() {
	@Override
	public void run() {
	addAndAnimateNewContent(nextCertView);
	}
	});
	}

	private void animateOldContent(Runnable callback) {
	// Fade out
	mCurrentCertLayout.animate()
	.alpha(0)
	.setDuration(OUT_DURATION_MS)
	.setInterpolator(AnimationUtils.loadInterpolator(mActivity,
	android.R.interpolator.fast_out_linear_in))
	.withEndAction(callback)
	.start();
	}

	private void addAndAnimateNewContent(View nextCertLayout) {
	mCurrentCertLayout = nextCertLayout;
	mRootContainer.removeAllViews();
	mRootContainer.addView(nextCertLayout);

	mRootContainer.addOnLayoutChangeListener( new View.OnLayoutChangeListener() {
	@Override
	public void onLayoutChange(View v, int left, int top, int right, int bottom,
	int oldLeft, int oldTop, int oldRight, int oldBottom) {
	mRootContainer.removeOnLayoutChangeListener(this);

	// Animate slide in from the right
	final int containerWidth = mRootContainer.getWidth();
	mCurrentCertLayout.setTranslationX(containerWidth);
	mCurrentCertLayout.animate()
	.translationX(0)
	.setInterpolator(AnimationUtils.loadInterpolator(mActivity,
	android.R.interpolator.linear_out_slow_in))
	.setDuration(IN_DURATION_MS)
	.start();
	}
	});
	}
	}
	}