src/com/android/packageinstaller/permission/ui/GrantPermissionsDefaultViewHandler.java - platform/packages/apps/PackageInstaller - Git at Google

 /*
  * Copyright (C) 2015 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.packageinstaller.permission.ui;

 import android.animation.Animator;
 import android.animation.AnimatorListenerAdapter;
 import android.animation.ObjectAnimator;
 import android.content.Context;
 import android.graphics.drawable.Icon;
 import android.os.Bundle;
 import android.util.SparseArray;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.view.View.OnLayoutChangeListener;
 import android.view.ViewGroup;
 import android.view.ViewParent;
 import android.view.ViewRootImpl;
 import android.view.WindowManager.LayoutParams;
 import android.view.animation.Animation;
 import android.view.animation.AnimationUtils;
 import android.view.animation.Interpolator;
 import android.widget.Button;
 import android.widget.CheckBox;
 import android.widget.ImageView;
 import android.widget.TextView;

 import com.android.internal.widget.ButtonBarLayout;
 import com.android.packageinstaller.R;

 import java.util.ArrayList;

 final class GrantPermissionsDefaultViewHandler
         implements GrantPermissionsViewHandler, OnClickListener {

     public static final String ARG_GROUP_NAME = "ARG_GROUP_NAME";
     public static final String ARG_GROUP_COUNT = "ARG_GROUP_COUNT";
     public static final String ARG_GROUP_INDEX = "ARG_GROUP_INDEX";
     public static final String ARG_GROUP_ICON = "ARG_GROUP_ICON";
     public static final String ARG_GROUP_MESSAGE = "ARG_GROUP_MESSAGE";
     public static final String ARG_GROUP_SHOW_DO_NOT_ASK = "ARG_GROUP_SHOW_DO_NOT_ASK";
     public static final String ARG_GROUP_DO_NOT_ASK_CHECKED = "ARG_GROUP_DO_NOT_ASK_CHECKED";

     // Animation parameters.
     private static final long SIZE_START_DELAY = 300;
     private static final long SIZE_START_LENGTH = 233;
     private static final long FADE_OUT_START_DELAY = 300;
     private static final long FADE_OUT_START_LENGTH = 217;
     private static final long TRANSLATE_START_DELAY = 367;
     private static final long TRANSLATE_LENGTH = 317;
     private static final long GROUP_UPDATE_DELAY = 400;
     private static final long DO_NOT_ASK_CHECK_DELAY = 450;

     private final Context mContext;

     private ResultListener mResultListener;

     private String mGroupName;
     private int mGroupCount;
     private int mGroupIndex;
     private Icon mGroupIcon;
     private CharSequence mGroupMessage;
     private boolean mShowDonNotAsk;
     private boolean mDoNotAskChecked;

     private ImageView mIconView;
     private TextView mCurrentGroupView;
     private TextView mMessageView;
     private CheckBox mDoNotAskCheckbox;
     private Button mAllowButton;

     private ArrayList<ViewHeightController> mHeightControllers;
     private ManualLayoutFrame mRootView;

     // Needed for animation
     private ViewGroup mDescContainer;
     private ViewGroup mCurrentDesc;
     private ViewGroup mNextDesc;

     private ViewGroup mDialogContainer;

     private final Runnable mUpdateGroup = new Runnable() {
         @Override
         public void run() {
             updateGroup();
         }
     };

     GrantPermissionsDefaultViewHandler(Context context) {
         mContext = context;
     }

     @Override
     public GrantPermissionsDefaultViewHandler setResultListener(ResultListener listener) {
         mResultListener = listener;
         return this;
     }

     @Override
     public void saveInstanceState(Bundle arguments) {
         arguments.putString(ARG_GROUP_NAME, mGroupName);
         arguments.putInt(ARG_GROUP_COUNT, mGroupCount);
         arguments.putInt(ARG_GROUP_INDEX, mGroupIndex);
         arguments.putParcelable(ARG_GROUP_ICON, mGroupIcon);
         arguments.putCharSequence(ARG_GROUP_MESSAGE, mGroupMessage);
         arguments.putBoolean(ARG_GROUP_SHOW_DO_NOT_ASK, mShowDonNotAsk);
         arguments.putBoolean(ARG_GROUP_DO_NOT_ASK_CHECKED, mDoNotAskCheckbox.isChecked());
     }

     @Override
     public void loadInstanceState(Bundle savedInstanceState) {
         mGroupName = savedInstanceState.getString(ARG_GROUP_NAME);
         mGroupMessage = savedInstanceState.getCharSequence(ARG_GROUP_MESSAGE);
         mGroupIcon = savedInstanceState.getParcelable(ARG_GROUP_ICON);
         mGroupCount = savedInstanceState.getInt(ARG_GROUP_COUNT);
         mGroupIndex = savedInstanceState.getInt(ARG_GROUP_INDEX);
         mShowDonNotAsk = savedInstanceState.getBoolean(ARG_GROUP_SHOW_DO_NOT_ASK);
         mDoNotAskChecked = savedInstanceState.getBoolean(ARG_GROUP_DO_NOT_ASK_CHECKED);
     }

     @Override
     public void updateUi(String groupName, int groupCount, int groupIndex, Icon icon,
             CharSequence message, boolean showDonNotAsk) {
         mGroupName = groupName;
         mGroupCount = groupCount;
         mGroupIndex = groupIndex;
         mGroupIcon = icon;
         mGroupMessage = message;
         mShowDonNotAsk = showDonNotAsk;
         mDoNotAskChecked = false;
         // If this is a second (or later) permission and the views exist, then animate.
         if (mIconView != null) {
             if (mGroupIndex > 0) {
                 // The first message will be announced as the title of the activity, all others
                 // we need to announce ourselves.
                 mDescContainer.announceForAccessibility(message);
                 animateToPermission();
             } else {
                 updateDescription();
                 updateGroup();
                 updateDoNotAskCheckBox();
             }
         }
     }

     private void animateToPermission() {
         if (mHeightControllers == null) {
             // We need to manually control the height of any views heigher than the root that
             // we inflate.  Find all the views up to the root and create ViewHeightControllers for
             // them.
             mHeightControllers = new ArrayList<>();
             ViewRootImpl viewRoot = mRootView.getViewRootImpl();
             ViewParent v = mRootView.getParent();
             addHeightController(mDialogContainer);
             addHeightController(mRootView);
             while (v != viewRoot) {
                 addHeightController((View) v);
                 v = v.getParent();
             }
             // On the heighest level view, we want to setTop rather than setBottom to control the
             // height, this way the dialog will grow up rather than down.
             ViewHeightController realRootView =
                     mHeightControllers.get(mHeightControllers.size() - 1);
             realRootView.setControlTop(true);
         }

         // Grab the current height/y positions, then wait for the layout to change,
         // so we can get the end height/y positions.
         final SparseArray<Float> startPositions = getViewPositions();
         final int startHeight = mRootView.getLayoutHeight();
         mRootView.addOnLayoutChangeListener(new OnLayoutChangeListener() {
             @Override
             public void onLayoutChange(View v, int left, int top, int right, int bottom, int oldLeft,
                     int oldTop, int oldRight, int oldBottom) {
                 mRootView.removeOnLayoutChangeListener(this);
                 SparseArray<Float> endPositions = getViewPositions();
                 int endHeight = mRootView.getLayoutHeight();
                 if (startPositions.get(R.id.do_not_ask_checkbox) == 0
                         && endPositions.get(R.id.do_not_ask_checkbox) != 0) {
                     // If the checkbox didn't have a position before but has one now then set
                     // the start position to the end position because it just became visible.
                     startPositions.put(R.id.do_not_ask_checkbox,
                             endPositions.get(R.id.do_not_ask_checkbox));
                 }
                 animateYPos(startPositions, endPositions, endHeight - startHeight);
             }
         });

         // Fade out old description group and scale out the icon for it.
         Interpolator interpolator = AnimationUtils.loadInterpolator(mContext,
                 android.R.interpolator.fast_out_linear_in);
         mIconView.animate()
                 .scaleX(0)
                 .scaleY(0)
                 .setStartDelay(FADE_OUT_START_DELAY)
                 .setDuration(FADE_OUT_START_LENGTH)
                 .setInterpolator(interpolator)
                 .start();
         mCurrentDesc.animate()
                 .alpha(0)
                 .setStartDelay(FADE_OUT_START_DELAY)
                 .setDuration(FADE_OUT_START_LENGTH)
                 .setInterpolator(interpolator)
                 .setListener(null)
                 .start();

         // Update the index of the permission after the animations have started.
         mCurrentGroupView.getHandler().postDelayed(mUpdateGroup, GROUP_UPDATE_DELAY);

         // Add the new description and translate it in.
         mNextDesc = (ViewGroup) LayoutInflater.from(mContext).inflate(
                 R.layout.permission_description, mDescContainer, false);

         mMessageView = (TextView) mNextDesc.findViewById(R.id.permission_message);
         mIconView = (ImageView) mNextDesc.findViewById(R.id.permission_icon);
         updateDescription();

         int width = mDescContainer.getRootView().getWidth();
         mDescContainer.addView(mNextDesc);
         mNextDesc.setTranslationX(width);

         final View oldDesc = mCurrentDesc;
         // Remove the old view from the description, so that we can shrink if necessary.
         mDescContainer.removeView(oldDesc);
         oldDesc.setPadding(mDescContainer.getLeft(), mDescContainer.getTop(),
                 mRootView.getRight() - mDescContainer.getRight(), 0);
         mRootView.addView(oldDesc);

         mCurrentDesc = mNextDesc;
         mNextDesc.animate()
                 .translationX(0)
                 .setStartDelay(TRANSLATE_START_DELAY)
                 .setDuration(TRANSLATE_LENGTH)
                 .setInterpolator(AnimationUtils.loadInterpolator(mContext,
                         android.R.interpolator.linear_out_slow_in))
                 .setListener(new AnimatorListenerAdapter() {
                     @Override
                     public void onAnimationEnd(Animator animation) {
                         // This is the longest animation, when it finishes, we are done.
                         mRootView.removeView(oldDesc);
                     }
                 })
                 .start();

         boolean visibleBefore = mDoNotAskCheckbox.getVisibility() == View.VISIBLE;
         updateDoNotAskCheckBox();
         boolean visibleAfter = mDoNotAskCheckbox.getVisibility() == View.VISIBLE;
         if (visibleBefore != visibleAfter) {
             Animation anim = AnimationUtils.loadAnimation(mContext,
                     visibleAfter ? android.R.anim.fade_in : android.R.anim.fade_out);
             anim.setStartOffset(visibleAfter ? DO_NOT_ASK_CHECK_DELAY : 0);
             mDoNotAskCheckbox.startAnimation(anim);
         }
     }

     private void addHeightController(View v) {
         ViewHeightController heightController = new ViewHeightController(v);
         heightController.setHeight(v.getHeight());
         mHeightControllers.add(heightController);
     }

     private SparseArray<Float> getViewPositions() {
         SparseArray<Float> locMap = new SparseArray<>();
         final int N = mDialogContainer.getChildCount();
         for (int i = 0; i < N; i++) {
             View child = mDialogContainer.getChildAt(i);
             if (child.getId() <= 0) {
                 // Only track views with ids.
                 continue;
             }
             locMap.put(child.getId(), child.getY());
         }
         return locMap;
     }

     private void animateYPos(SparseArray<Float> startPositions, SparseArray<Float> endPositions,
             int heightDiff) {
         final int N = startPositions.size();
         for (int i = 0; i < N; i++) {
             int key = startPositions.keyAt(i);
             float start = startPositions.get(key);
             float end = endPositions.get(key);
             if (start != end) {
                 final View child = mDialogContainer.findViewById(key);
                 child.setTranslationY(start - end);
                 child.animate()
                         .setStartDelay(SIZE_START_DELAY)
                         .setDuration(SIZE_START_LENGTH)
                         .translationY(0)
                         .start();
             }
         }
         for (int i = 0; i < mHeightControllers.size(); i++) {
             mHeightControllers.get(i).animateAddHeight(heightDiff);
         }
     }

     @Override
     public View createView() {
         mRootView = (ManualLayoutFrame) LayoutInflater.from(mContext)
                 .inflate(R.layout.grant_permissions, null);
         ((ButtonBarLayout) mRootView.findViewById(R.id.button_group)).setAllowStacking(
                 Resources.getSystem().getBoolean(
                         com.android.internal.R.bool.allow_stacked_button_bar));

         mDialogContainer = (ViewGroup) mRootView.findViewById(R.id.dialog_container);
         mMessageView = (TextView) mRootView.findViewById(R.id.permission_message);
         mIconView = (ImageView) mRootView.findViewById(R.id.permission_icon);
         mCurrentGroupView = (TextView) mRootView.findViewById(R.id.current_page_text);
         mDoNotAskCheckbox = (CheckBox) mRootView.findViewById(R.id.do_not_ask_checkbox);
         mAllowButton = (Button) mRootView.findViewById(R.id.permission_allow_button);

         mDescContainer = (ViewGroup) mRootView.findViewById(R.id.desc_container);
         mCurrentDesc = (ViewGroup) mRootView.findViewById(R.id.perm_desc_root);

         mAllowButton.setOnClickListener(this);
         mRootView.findViewById(R.id.permission_deny_button).setOnClickListener(this);
         mDoNotAskCheckbox.setOnClickListener(this);

         if (mGroupName != null) {
             updateDescription();
             updateGroup();
             updateDoNotAskCheckBox();
         }

         return mRootView;
     }

     @Override
     public void updateWindowAttributes(LayoutParams outLayoutParams) {
         // No-op
     }

     private void updateDescription() {
         mIconView.setImageDrawable(mGroupIcon.loadDrawable(mContext));
         mMessageView.setText(mGroupMessage);
     }

     private void updateGroup() {
         if (mGroupCount > 1) {
             mCurrentGroupView.setVisibility(View.VISIBLE);
             mCurrentGroupView.setText(mContext.getString(R.string.current_permission_template,
                     mGroupIndex + 1, mGroupCount));
         } else {
             mCurrentGroupView.setVisibility(View.INVISIBLE);
         }
     }

     private void updateDoNotAskCheckBox() {
         if (mShowDonNotAsk) {
             mDoNotAskCheckbox.setVisibility(View.VISIBLE);
             mDoNotAskCheckbox.setOnClickListener(this);
             mDoNotAskCheckbox.setChecked(mDoNotAskChecked);
         } else {
             mDoNotAskCheckbox.setVisibility(View.GONE);
             mDoNotAskCheckbox.setOnClickListener(null);
         }
     }

     @Override
     public void onClick(View view) {
         switch (view.getId()) {
             case R.id.permission_allow_button:
                 if (mResultListener != null) {
                     view.clearAccessibilityFocus();
                     mResultListener.onPermissionGrantResult(mGroupName, true, false);
                 }
                 break;
             case R.id.permission_deny_button:
                 mAllowButton.setEnabled(true);
                 if (mResultListener != null) {
                     view.clearAccessibilityFocus();
                     mResultListener.onPermissionGrantResult(mGroupName, false,
                             mDoNotAskCheckbox.isChecked());
                 }
                 break;
             case R.id.do_not_ask_checkbox:
                 mAllowButton.setEnabled(!mDoNotAskCheckbox.isChecked());
                 break;
         }
     }

     @Override
     public void onBackPressed() {
         if (mResultListener != null) {
             final boolean doNotAskAgain = mDoNotAskCheckbox.isChecked();
             mResultListener.onPermissionGrantResult(mGroupName, false, doNotAskAgain);
         }
     }

     /**
      * Manually controls the height of a view through getBottom/setTop.  Also listens
      * for layout changes and sets the height again to be sure it doesn't change.
      */
     private static final class ViewHeightController implements OnLayoutChangeListener {
         private final View mView;
         private int mHeight;
         private int mNextHeight;
         private boolean mControlTop;
         private ObjectAnimator mAnimator;

         public ViewHeightController(View view) {
             mView = view;
             mView.addOnLayoutChangeListener(this);
         }

         public void setControlTop(boolean controlTop) {
             mControlTop = controlTop;
         }

         public void animateAddHeight(int heightDiff) {
             if (heightDiff != 0) {
                 if (mNextHeight == 0) {
                     mNextHeight = mHeight;
                 }
                 mNextHeight += heightDiff;
                 if (mAnimator != null) {
                     mAnimator.cancel();
                 }
                 mAnimator = ObjectAnimator.ofInt(this, "height", mHeight, mNextHeight);
                 mAnimator.setStartDelay(SIZE_START_DELAY);
                 mAnimator.setDuration(SIZE_START_LENGTH);
                 mAnimator.start();
             }
         }

         public void setHeight(int height) {
             mHeight = height;
             updateHeight();
         }

         @Override
         public void onLayoutChange(View v, int left, int top, int right, int bottom, int oldLeft,
                 int oldTop, int oldRight, int oldBottom) {
             // Ensure that the height never changes.
             updateHeight();
         }

         private void updateHeight() {
             if (mControlTop) {
                 mView.setTop(mView.getBottom() - mHeight);
             } else {
                 mView.setBottom(mView.getTop() + mHeight);
             }
         }
     }
 }
	/*
	* Copyright (C) 2015 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.packageinstaller.permission.ui;

	import android.animation.Animator;
	import android.animation.AnimatorListenerAdapter;
	import android.animation.ObjectAnimator;
	import android.content.Context;
	import android.graphics.drawable.Icon;
	import android.os.Bundle;
	import android.util.SparseArray;
	import android.view.LayoutInflater;
	import android.view.View;
	import android.view.View.OnClickListener;
	import android.view.View.OnLayoutChangeListener;
	import android.view.ViewGroup;
	import android.view.ViewParent;
	import android.view.ViewRootImpl;
	import android.view.WindowManager.LayoutParams;
	import android.view.animation.Animation;
	import android.view.animation.AnimationUtils;
	import android.view.animation.Interpolator;
	import android.widget.Button;
	import android.widget.CheckBox;
	import android.widget.ImageView;
	import android.widget.TextView;

	import com.android.internal.widget.ButtonBarLayout;
	import com.android.packageinstaller.R;

	import java.util.ArrayList;

	final class GrantPermissionsDefaultViewHandler
	implements GrantPermissionsViewHandler, OnClickListener {

	public static final String ARG_GROUP_NAME = "ARG_GROUP_NAME";
	public static final String ARG_GROUP_COUNT = "ARG_GROUP_COUNT";
	public static final String ARG_GROUP_INDEX = "ARG_GROUP_INDEX";
	public static final String ARG_GROUP_ICON = "ARG_GROUP_ICON";
	public static final String ARG_GROUP_MESSAGE = "ARG_GROUP_MESSAGE";
	public static final String ARG_GROUP_SHOW_DO_NOT_ASK = "ARG_GROUP_SHOW_DO_NOT_ASK";
	public static final String ARG_GROUP_DO_NOT_ASK_CHECKED = "ARG_GROUP_DO_NOT_ASK_CHECKED";

	// Animation parameters.
	private static final long SIZE_START_DELAY = 300;
	private static final long SIZE_START_LENGTH = 233;
	private static final long FADE_OUT_START_DELAY = 300;
	private static final long FADE_OUT_START_LENGTH = 217;
	private static final long TRANSLATE_START_DELAY = 367;
	private static final long TRANSLATE_LENGTH = 317;
	private static final long GROUP_UPDATE_DELAY = 400;
	private static final long DO_NOT_ASK_CHECK_DELAY = 450;

	private final Context mContext;

	private ResultListener mResultListener;

	private String mGroupName;
	private int mGroupCount;
	private int mGroupIndex;
	private Icon mGroupIcon;
	private CharSequence mGroupMessage;
	private boolean mShowDonNotAsk;
	private boolean mDoNotAskChecked;

	private ImageView mIconView;
	private TextView mCurrentGroupView;
	private TextView mMessageView;
	private CheckBox mDoNotAskCheckbox;
	private Button mAllowButton;

	private ArrayList<ViewHeightController> mHeightControllers;
	private ManualLayoutFrame mRootView;

	// Needed for animation
	private ViewGroup mDescContainer;
	private ViewGroup mCurrentDesc;
	private ViewGroup mNextDesc;

	private ViewGroup mDialogContainer;

	private final Runnable mUpdateGroup = new Runnable() {
	@Override
	public void run() {
	updateGroup();
	}
	};

	GrantPermissionsDefaultViewHandler(Context context) {
	mContext = context;
	}

	@Override
	public GrantPermissionsDefaultViewHandler setResultListener(ResultListener listener) {
	mResultListener = listener;
	return this;
	}

	@Override
	public void saveInstanceState(Bundle arguments) {
	arguments.putString(ARG_GROUP_NAME, mGroupName);
	arguments.putInt(ARG_GROUP_COUNT, mGroupCount);
	arguments.putInt(ARG_GROUP_INDEX, mGroupIndex);
	arguments.putParcelable(ARG_GROUP_ICON, mGroupIcon);
	arguments.putCharSequence(ARG_GROUP_MESSAGE, mGroupMessage);
	arguments.putBoolean(ARG_GROUP_SHOW_DO_NOT_ASK, mShowDonNotAsk);
	arguments.putBoolean(ARG_GROUP_DO_NOT_ASK_CHECKED, mDoNotAskCheckbox.isChecked());
	}

	@Override
	public void loadInstanceState(Bundle savedInstanceState) {
	mGroupName = savedInstanceState.getString(ARG_GROUP_NAME);
	mGroupMessage = savedInstanceState.getCharSequence(ARG_GROUP_MESSAGE);
	mGroupIcon = savedInstanceState.getParcelable(ARG_GROUP_ICON);
	mGroupCount = savedInstanceState.getInt(ARG_GROUP_COUNT);
	mGroupIndex = savedInstanceState.getInt(ARG_GROUP_INDEX);
	mShowDonNotAsk = savedInstanceState.getBoolean(ARG_GROUP_SHOW_DO_NOT_ASK);
	mDoNotAskChecked = savedInstanceState.getBoolean(ARG_GROUP_DO_NOT_ASK_CHECKED);
	}

	@Override
	public void updateUi(String groupName, int groupCount, int groupIndex, Icon icon,
	CharSequence message, boolean showDonNotAsk) {
	mGroupName = groupName;
	mGroupCount = groupCount;
	mGroupIndex = groupIndex;
	mGroupIcon = icon;
	mGroupMessage = message;
	mShowDonNotAsk = showDonNotAsk;
	mDoNotAskChecked = false;
	// If this is a second (or later) permission and the views exist, then animate.
	if (mIconView != null) {
	if (mGroupIndex > 0) {
	// The first message will be announced as the title of the activity, all others
	// we need to announce ourselves.
	mDescContainer.announceForAccessibility(message);
	animateToPermission();
	} else {
	updateDescription();
	updateGroup();
	updateDoNotAskCheckBox();
	}
	}
	}

	private void animateToPermission() {
	if (mHeightControllers == null) {
	// We need to manually control the height of any views heigher than the root that
	// we inflate. Find all the views up to the root and create ViewHeightControllers for
	// them.
	mHeightControllers = new ArrayList<>();
	ViewRootImpl viewRoot = mRootView.getViewRootImpl();
	ViewParent v = mRootView.getParent();
	addHeightController(mDialogContainer);
	addHeightController(mRootView);
	while (v != viewRoot) {
	addHeightController((View) v);
	v = v.getParent();
	}
	// On the heighest level view, we want to setTop rather than setBottom to control the
	// height, this way the dialog will grow up rather than down.
	ViewHeightController realRootView =
	mHeightControllers.get(mHeightControllers.size() - 1);
	realRootView.setControlTop(true);
	}

	// Grab the current height/y positions, then wait for the layout to change,
	// so we can get the end height/y positions.
	final SparseArray<Float> startPositions = getViewPositions();
	final int startHeight = mRootView.getLayoutHeight();
	mRootView.addOnLayoutChangeListener(new OnLayoutChangeListener() {
	@Override
	public void onLayoutChange(View v, int left, int top, int right, int bottom, int oldLeft,
	int oldTop, int oldRight, int oldBottom) {
	mRootView.removeOnLayoutChangeListener(this);
	SparseArray<Float> endPositions = getViewPositions();
	int endHeight = mRootView.getLayoutHeight();
	if (startPositions.get(R.id.do_not_ask_checkbox) == 0
	&& endPositions.get(R.id.do_not_ask_checkbox) != 0) {
	// If the checkbox didn't have a position before but has one now then set
	// the start position to the end position because it just became visible.
	startPositions.put(R.id.do_not_ask_checkbox,
	endPositions.get(R.id.do_not_ask_checkbox));
	}
	animateYPos(startPositions, endPositions, endHeight - startHeight);
	}
	});

	// Fade out old description group and scale out the icon for it.
	Interpolator interpolator = AnimationUtils.loadInterpolator(mContext,
	android.R.interpolator.fast_out_linear_in);
	mIconView.animate()
	.scaleX(0)
	.scaleY(0)
	.setStartDelay(FADE_OUT_START_DELAY)
	.setDuration(FADE_OUT_START_LENGTH)
	.setInterpolator(interpolator)
	.start();
	mCurrentDesc.animate()
	.alpha(0)
	.setStartDelay(FADE_OUT_START_DELAY)
	.setDuration(FADE_OUT_START_LENGTH)
	.setInterpolator(interpolator)
	.setListener(null)
	.start();

	// Update the index of the permission after the animations have started.
	mCurrentGroupView.getHandler().postDelayed(mUpdateGroup, GROUP_UPDATE_DELAY);

	// Add the new description and translate it in.
	mNextDesc = (ViewGroup) LayoutInflater.from(mContext).inflate(
	R.layout.permission_description, mDescContainer, false);

	mMessageView = (TextView) mNextDesc.findViewById(R.id.permission_message);
	mIconView = (ImageView) mNextDesc.findViewById(R.id.permission_icon);
	updateDescription();

	int width = mDescContainer.getRootView().getWidth();
	mDescContainer.addView(mNextDesc);
	mNextDesc.setTranslationX(width);

	final View oldDesc = mCurrentDesc;
	// Remove the old view from the description, so that we can shrink if necessary.
	mDescContainer.removeView(oldDesc);
	oldDesc.setPadding(mDescContainer.getLeft(), mDescContainer.getTop(),
	mRootView.getRight() - mDescContainer.getRight(), 0);
	mRootView.addView(oldDesc);

	mCurrentDesc = mNextDesc;
	mNextDesc.animate()
	.translationX(0)
	.setStartDelay(TRANSLATE_START_DELAY)
	.setDuration(TRANSLATE_LENGTH)
	.setInterpolator(AnimationUtils.loadInterpolator(mContext,
	android.R.interpolator.linear_out_slow_in))
	.setListener(new AnimatorListenerAdapter() {
	@Override
	public void onAnimationEnd(Animator animation) {
	// This is the longest animation, when it finishes, we are done.
	mRootView.removeView(oldDesc);
	}
	})
	.start();

	boolean visibleBefore = mDoNotAskCheckbox.getVisibility() == View.VISIBLE;
	updateDoNotAskCheckBox();
	boolean visibleAfter = mDoNotAskCheckbox.getVisibility() == View.VISIBLE;
	if (visibleBefore != visibleAfter) {
	Animation anim = AnimationUtils.loadAnimation(mContext,
	visibleAfter ? android.R.anim.fade_in : android.R.anim.fade_out);
	anim.setStartOffset(visibleAfter ? DO_NOT_ASK_CHECK_DELAY : 0);
	mDoNotAskCheckbox.startAnimation(anim);
	}
	}

	private void addHeightController(View v) {
	ViewHeightController heightController = new ViewHeightController(v);
	heightController.setHeight(v.getHeight());
	mHeightControllers.add(heightController);
	}

	private SparseArray<Float> getViewPositions() {
	SparseArray<Float> locMap = new SparseArray<>();
	final int N = mDialogContainer.getChildCount();
	for (int i = 0; i < N; i++) {
	View child = mDialogContainer.getChildAt(i);
	if (child.getId() <= 0) {
	// Only track views with ids.
	continue;
	}
	locMap.put(child.getId(), child.getY());
	}
	return locMap;
	}

	private void animateYPos(SparseArray<Float> startPositions, SparseArray<Float> endPositions,
	int heightDiff) {
	final int N = startPositions.size();
	for (int i = 0; i < N; i++) {
	int key = startPositions.keyAt(i);
	float start = startPositions.get(key);
	float end = endPositions.get(key);
	if (start != end) {
	final View child = mDialogContainer.findViewById(key);
	child.setTranslationY(start - end);
	child.animate()
	.setStartDelay(SIZE_START_DELAY)
	.setDuration(SIZE_START_LENGTH)
	.translationY(0)
	.start();
	}
	}
	for (int i = 0; i < mHeightControllers.size(); i++) {
	mHeightControllers.get(i).animateAddHeight(heightDiff);
	}
	}

	@Override
	public View createView() {
	mRootView = (ManualLayoutFrame) LayoutInflater.from(mContext)
	.inflate(R.layout.grant_permissions, null);
	((ButtonBarLayout) mRootView.findViewById(R.id.button_group)).setAllowStacking(
	Resources.getSystem().getBoolean(
	com.android.internal.R.bool.allow_stacked_button_bar));

	mDialogContainer = (ViewGroup) mRootView.findViewById(R.id.dialog_container);
	mMessageView = (TextView) mRootView.findViewById(R.id.permission_message);
	mIconView = (ImageView) mRootView.findViewById(R.id.permission_icon);
	mCurrentGroupView = (TextView) mRootView.findViewById(R.id.current_page_text);
	mDoNotAskCheckbox = (CheckBox) mRootView.findViewById(R.id.do_not_ask_checkbox);
	mAllowButton = (Button) mRootView.findViewById(R.id.permission_allow_button);

	mDescContainer = (ViewGroup) mRootView.findViewById(R.id.desc_container);
	mCurrentDesc = (ViewGroup) mRootView.findViewById(R.id.perm_desc_root);

	mAllowButton.setOnClickListener(this);
	mRootView.findViewById(R.id.permission_deny_button).setOnClickListener(this);
	mDoNotAskCheckbox.setOnClickListener(this);

	if (mGroupName != null) {
	updateDescription();
	updateGroup();
	updateDoNotAskCheckBox();
	}

	return mRootView;
	}

	@Override
	public void updateWindowAttributes(LayoutParams outLayoutParams) {
	// No-op
	}

	private void updateDescription() {
	mIconView.setImageDrawable(mGroupIcon.loadDrawable(mContext));
	mMessageView.setText(mGroupMessage);
	}

	private void updateGroup() {
	if (mGroupCount > 1) {
	mCurrentGroupView.setVisibility(View.VISIBLE);
	mCurrentGroupView.setText(mContext.getString(R.string.current_permission_template,
	mGroupIndex + 1, mGroupCount));
	} else {
	mCurrentGroupView.setVisibility(View.INVISIBLE);
	}
	}

	private void updateDoNotAskCheckBox() {
	if (mShowDonNotAsk) {
	mDoNotAskCheckbox.setVisibility(View.VISIBLE);
	mDoNotAskCheckbox.setOnClickListener(this);
	mDoNotAskCheckbox.setChecked(mDoNotAskChecked);
	} else {
	mDoNotAskCheckbox.setVisibility(View.GONE);
	mDoNotAskCheckbox.setOnClickListener(null);
	}
	}

	@Override
	public void onClick(View view) {
	switch (view.getId()) {
	case R.id.permission_allow_button:
	if (mResultListener != null) {
	view.clearAccessibilityFocus();
	mResultListener.onPermissionGrantResult(mGroupName, true, false);
	}
	break;
	case R.id.permission_deny_button:
	mAllowButton.setEnabled(true);
	if (mResultListener != null) {
	view.clearAccessibilityFocus();
	mResultListener.onPermissionGrantResult(mGroupName, false,
	mDoNotAskCheckbox.isChecked());
	}
	break;
	case R.id.do_not_ask_checkbox:
	mAllowButton.setEnabled(!mDoNotAskCheckbox.isChecked());
	break;
	}
	}

	@Override
	public void onBackPressed() {
	if (mResultListener != null) {
	final boolean doNotAskAgain = mDoNotAskCheckbox.isChecked();
	mResultListener.onPermissionGrantResult(mGroupName, false, doNotAskAgain);
	}
	}

	/**
	* Manually controls the height of a view through getBottom/setTop. Also listens
	* for layout changes and sets the height again to be sure it doesn't change.
	*/
	private static final class ViewHeightController implements OnLayoutChangeListener {
	private final View mView;
	private int mHeight;
	private int mNextHeight;
	private boolean mControlTop;
	private ObjectAnimator mAnimator;

	public ViewHeightController(View view) {
	mView = view;
	mView.addOnLayoutChangeListener(this);
	}

	public void setControlTop(boolean controlTop) {
	mControlTop = controlTop;
	}

	public void animateAddHeight(int heightDiff) {
	if (heightDiff != 0) {
	if (mNextHeight == 0) {
	mNextHeight = mHeight;
	}
	mNextHeight += heightDiff;
	if (mAnimator != null) {
	mAnimator.cancel();
	}
	mAnimator = ObjectAnimator.ofInt(this, "height", mHeight, mNextHeight);
	mAnimator.setStartDelay(SIZE_START_DELAY);
	mAnimator.setDuration(SIZE_START_LENGTH);
	mAnimator.start();
	}
	}

	public void setHeight(int height) {
	mHeight = height;
	updateHeight();
	}

	@Override
	public void onLayoutChange(View v, int left, int top, int right, int bottom, int oldLeft,
	int oldTop, int oldRight, int oldBottom) {
	// Ensure that the height never changes.
	updateHeight();
	}

	private void updateHeight() {
	if (mControlTop) {
	mView.setTop(mView.getBottom() - mHeight);
	} else {
	mView.setBottom(mView.getTop() + mHeight);
	}
	}
	}
	}