Cache icon drawables.

There's only a few of these. They currently get reloaded every time
the view changes states. This loading also happens in an on-predraw
listener. Cache them instead.

Fixes: 145666518
Test: atest SystemUITests
Change-Id: I5727459d395f1e347db42d91b313913c079ff3be

packages/SystemUI/src/com/android/systemui/statusbar/phone/LockIcon.java

@@ -19,6 +19,7 @@ package com.android.systemui.statusbar.phone;
 import android.annotation.IntDef;
 import android.content.Context;
 import android.content.res.ColorStateList;
+import android.content.res.Configuration;
 import android.graphics.Color;
 import android.graphics.drawable.Animatable2;
 import android.graphics.drawable.AnimatedVectorDrawable;
@@ -27,6 +28,7 @@ import android.os.Trace;
 import android.provider.Settings;
 import android.text.TextUtils;
 import android.util.AttributeSet;
+import android.util.SparseArray;
 import android.view.ViewTreeObserver.OnPreDrawListener;
 
 import com.android.internal.graphics.ColorUtils;
@@ -53,7 +55,7 @@ public class LockIcon extends KeyguardAffordanceView {
     private boolean mPulsing;
     private boolean mDozing;
     private boolean mKeyguardJustShown;
-    private boolean mScanningFace;
+    private final SparseArray<Drawable> mDrawableCache = new SparseArray<>();
 
     private final OnPreDrawListener mOnPreDrawListener = new OnPreDrawListener() {
         @Override
@@ -61,23 +63,15 @@ public class LockIcon extends KeyguardAffordanceView {
             getViewTreeObserver().removeOnPreDrawListener(this);
 
             int newState = mStateProvider.getState();
-            @LockAnimIndex final int lockAnimIndex =
-                    getAnimationIndexForTransition(mOldState, newState, mPulsing, mDozing,
-                            mKeyguardJustShown);
-
-            boolean isAnim = lockAnimIndex != -1;
-            int iconRes = isAnim ? getThemedAnimationResId(lockAnimIndex)
-                    : LockIcon.getIconForState(newState);
-
-            Drawable icon = getResources().getDrawable(iconRes);
-
+            Drawable icon = getIcon(newState);
             setImageDrawable(icon, false);
-            if (mScanningFace) {
+
+            if (newState == STATE_SCANNING_FACE) {
                 announceForAccessibility(getResources().getString(
                         R.string.accessibility_scanning_face));
             }
 
-            if (isAnim && icon instanceof AnimatedVectorDrawable) {
+            if (icon instanceof AnimatedVectorDrawable) {
                 final AnimatedVectorDrawable animation = (AnimatedVectorDrawable) icon;
                 animation.forceAnimationOnUI();
                 animation.clearAnimationCallbacks();
@@ -87,7 +81,7 @@ public class LockIcon extends KeyguardAffordanceView {
                             public void onAnimationEnd(Drawable drawable) {
                                 if (getDrawable() == animation
                                         && newState == mStateProvider.getState()
-                                        && lockAnimIndex == LockIcon.SCANNING) {
+                                        && newState == STATE_SCANNING_FACE) {
                                     animation.start();
                                 } else {
                                     Trace.endAsyncSection("LockIcon#Animation", newState);
@@ -110,6 +104,12 @@ public class LockIcon extends KeyguardAffordanceView {
         mStateProvider = stateProvider;
     }
 
+    @Override
+    protected void onConfigurationChanged(Configuration newConfig) {
+        super.onConfigurationChanged(newConfig);
+        mDrawableCache.clear();
+    }
+
     /**
      * Update the icon visibility
      * @return true if the visibility changed
@@ -135,13 +135,11 @@ public class LockIcon extends KeyguardAffordanceView {
         return false;
     }
 
-    void update(int oldState, boolean pulsing, boolean dozing,
-            boolean keyguardJustShown, boolean scanningFace) {
+    void update(int oldState, boolean pulsing, boolean dozing, boolean keyguardJustShown) {
         mOldState = oldState;
         mPulsing = pulsing;
         mDozing = dozing;
         mKeyguardJustShown = keyguardJustShown;
-        mScanningFace = scanningFace;
 
         getViewTreeObserver().addOnPreDrawListener(mOnPreDrawListener);
     }
@@ -151,7 +149,8 @@ public class LockIcon extends KeyguardAffordanceView {
         updateDarkTint();
     }
 
-    void setIconColor(int iconColor) {
+    void onThemeChange(int iconColor) {
+        mDrawableCache.clear();
         mIconColor = iconColor;
         updateDarkTint();
     }
@@ -161,6 +160,21 @@ public class LockIcon extends KeyguardAffordanceView {
         setImageTintList(ColorStateList.valueOf(color));
     }
 
+    private Drawable getIcon(int newState) {
+        @LockAnimIndex final int lockAnimIndex =
+                getAnimationIndexForTransition(mOldState, newState, mPulsing, mDozing,
+                        mKeyguardJustShown);
+
+        boolean isAnim = lockAnimIndex != -1;
+        int iconRes = isAnim ? getThemedAnimationResId(lockAnimIndex) : getIconForState(newState);
+
+        if (!mDrawableCache.contains(iconRes)) {
+            mDrawableCache.put(iconRes, getResources().getDrawable(iconRes));
+        }
+
+        return mDrawableCache.get(iconRes);
+    }
+
     static int getIconForState(int state) {
         int iconRes;
         switch (state) {
@@ -206,7 +220,7 @@ public class LockIcon extends KeyguardAffordanceView {
     @IntDef({ERROR, UNLOCK, LOCK, SCANNING})
     @interface LockAnimIndex {}
     static final int ERROR = 0, UNLOCK = 1, LOCK = 2, SCANNING = 3;
-    static final int[][] LOCK_ANIM_RES_IDS = new int[][] {
+    private static final int[][] LOCK_ANIM_RES_IDS = new int[][] {
             {
                     R.anim.lock_to_error,
                     R.anim.lock_unlock,

packages/SystemUI/src/com/android/systemui/statusbar/phone/LockscreenLockIconController.java

@@ -75,7 +75,6 @@ public class LockscreenLockIconController {
     private final HeadsUpManagerPhone mHeadsUpManagerPhone;
     private boolean mKeyguardShowing;
     private boolean mKeyguardJustShown;
-    private boolean mIsFaceUnlockState;
     private boolean mBlockUpdates;
     private boolean mPulsing;
     private boolean mDozing;
@@ -150,7 +149,7 @@ public class LockscreenLockIconController {
                     null, new int[]{ R.attr.wallpaperTextColor }, 0, 0);
             int iconColor = typedArray.getColor(0, Color.WHITE);
             typedArray.recycle();
-            mLockIcon.setIconColor(iconColor);
+            mLockIcon.onThemeChange(iconColor);
         }
 
         @Override
@@ -299,7 +298,7 @@ public class LockscreenLockIconController {
                         info.addAction(unlock);
                         info.setHintText(mResources.getString(
                                 R.string.accessibility_waiting_for_fingerprint));
-                    } else if (mIsFaceUnlockState) {
+                    } else if (getState() == STATE_SCANNING_FACE) {
                         //Avoid 'button' to be spoken for scanning face
                         info.setClassName(LockIcon.class.getName());
                         info.setContentDescription(mResources.getString(
@@ -458,15 +457,12 @@ public class LockscreenLockIconController {
 
     private void update(boolean force) {
         int state = getState();
-        mIsFaceUnlockState = state == STATE_SCANNING_FACE;
-
         boolean shouldUpdate = mLastState != state || force;
         if (mBlockUpdates && canBlockUpdates()) {
             shouldUpdate = false;
         }
         if (shouldUpdate && mLockIcon != null) {
-            mLockIcon.update(
-                    mLastState, mPulsing, mDozing, mKeyguardJustShown, mIsFaceUnlockState);
+            mLockIcon.update(mLastState, mPulsing, mDozing, mKeyguardJustShown);
         }
         mLastState = state;
         mKeyguardJustShown = false;