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Commit 4aa74158 authored by Yeabkal Wubshit's avatar Yeabkal Wubshit
Browse files

Cache Device Motion Prediction Availability 

This saves the time needed for multiple method calls to get Resources and a resource value each time a prediction API is called.

Change-Id: Id7b2610a0a4bafc6bced69aeedb25ca1148755ea
parent e9c99318

core/java/android/view/MotionPredictor.java

+8 −15
Original line number Diff line number Diff line
@@ -49,15 +49,17 @@ public final class MotionPredictor { 


    // Pointer to the native object.

    private final long mPtr;

    private final Context mContext;

    // Device-specific override to enable/disable motion prediction.

    private final boolean mIsPredictionEnabled;



    /**

     * Create a new MotionPredictor for the provided {@link Context}.

     * @param context The context for the predictions

     */

    public MotionPredictor(@NonNull Context context) {

        mContext = context;

        final int offsetNanos = mContext.getResources().getInteger(

        mIsPredictionEnabled = context.getResources().getBoolean(

                com.android.internal.R.bool.config_enableMotionPrediction);

        final int offsetNanos = context.getResources().getInteger(

                com.android.internal.R.integer.config_motionPredictionOffsetNanos);

        mPtr = nativeInitialize(offsetNanos);

        RegistryHolder.REGISTRY.registerNativeAllocation(this, mPtr);
@@ -73,7 +75,7 @@ public final class MotionPredictor { 
     * @throws IllegalArgumentException if an inconsistent MotionEvent stream is sent.

     */

    public void record(@NonNull MotionEvent event) {

        if (!isPredictionEnabled()) {

        if (!mIsPredictionEnabled) {

            return;

        }

        nativeRecord(mPtr, event);
@@ -94,21 +96,12 @@ public final class MotionPredictor { 
     */

    @Nullable

    public MotionEvent predict(long predictionTimeNanos) {

        if (!isPredictionEnabled()) {

        if (!mIsPredictionEnabled) {

            return null;

        }

        return nativePredict(mPtr, predictionTimeNanos);

    }



    private boolean isPredictionEnabled() {

        // Device-specific override

        if (!mContext.getResources().getBoolean(

                com.android.internal.R.bool.config_enableMotionPrediction)) {

            return false;

        }

        return true;

    }



    /**

     * Check whether a device supports motion predictions for a given source type.

     *
@@ -120,7 +113,7 @@ public final class MotionPredictor { 
     * @see MotionEvent#getSource

     */

    public boolean isPredictionAvailable(int deviceId, int source) {

        return isPredictionEnabled() && nativeIsPredictionAvailable(mPtr, deviceId, source);

        return mIsPredictionEnabled && nativeIsPredictionAvailable(mPtr, deviceId, source);

    }



    private static native long nativeInitialize(int offsetNanos);