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Commit 5666ddfe authored by Noah Wang's avatar Noah Wang
Browse files

Inflate necessary previews upon user interaction instead of 

inflating everything on creation of the screen. This will
improve the speed of opening the screen and refreshing screen upon
commiting change.

Test: Manually tested by interacting with ViewPager and SeekBar.
Bug: 30697309
Change-Id: Ieb2fac95696b8be33fd508f3b75741529b68e946
parent 0948ce0c

src/com/android/settings/PreviewPagerAdapter.java

+79 −40
Original line number Diff line number Diff line
@@ -23,6 +23,8 @@ import android.support.v4.view.PagerAdapter; 
import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.view.ViewStub;

import android.view.ViewStub.OnInflateListener;

import android.view.animation.AccelerateInterpolator;

import android.view.animation.DecelerateInterpolator;

import android.view.animation.Interpolator;
@@ -53,10 +55,13 @@ public class PreviewPagerAdapter extends PagerAdapter { 


    private int mAnimationCounter;



    private boolean[][] mViewStubInflated;



    public PreviewPagerAdapter(Context context, boolean isLayoutRtl,

            int[] previewSampleResIds, Configuration[] configurations) {

        mIsLayoutRtl = isLayoutRtl;

        mPreviewFrames = new FrameLayout[previewSampleResIds.length];

        mViewStubInflated = new boolean[previewSampleResIds.length][configurations.length];



        for (int i = 0; i < previewSampleResIds.length; ++i) {

            int p = mIsLayoutRtl ? previewSampleResIds.length - 1 - i : i;
@@ -65,18 +70,25 @@ public class PreviewPagerAdapter extends PagerAdapter { 
                    LinearLayout.LayoutParams.MATCH_PARENT,

                    LinearLayout.LayoutParams.MATCH_PARENT));



            for (Configuration configuration : configurations) {

            for (int j = 0; j < configurations.length; ++j) {

                // Create a new configuration for the specified value. It won't

                // have any theme set, so manually apply the current theme.

                final Context configContext = context.createConfigurationContext(configuration);

                final Context configContext = context.createConfigurationContext(configurations[j]);

                configContext.setTheme(context.getThemeResId());



                final LayoutInflater configInflater = LayoutInflater.from(configContext);

                final View sampleView = configInflater.inflate(previewSampleResIds[i],

                        mPreviewFrames[p], false);

                sampleView.setAlpha(0);

                sampleView.setVisibility(View.INVISIBLE);

                mPreviewFrames[p].addView(sampleView);

                final ViewStub sampleViewStub = new ViewStub(configContext);

                sampleViewStub.setLayoutResource(previewSampleResIds[i]);

                final int fi = i, fj = j;

                sampleViewStub.setOnInflateListener(new OnInflateListener() {

                    @Override

                    public void onInflate(ViewStub stub, View inflated) {

                        inflated.setVisibility(stub.getVisibility());

                        mViewStubInflated[fi][fj] = true;

                    }

                });



                mPreviewFrames[p].addView(sampleViewStub);

            }

        }

    }
@@ -110,44 +122,71 @@ public class PreviewPagerAdapter extends PagerAdapter { 
        mAnimationEndAction = action;

    }



    void setPreviewLayer(int newIndex, int currentIndex, int currentItem, boolean animate) {

    void setPreviewLayer(int newLayerIndex, int currentLayerIndex, int currentFrameIndex,

            final boolean animate) {

        for (FrameLayout previewFrame : mPreviewFrames) {

            if (currentIndex >= 0) {

                final View lastLayer = previewFrame.getChildAt(currentIndex);

                if (animate && previewFrame == mPreviewFrames[currentItem]) {

                    lastLayer.animate()

                            .alpha(0)

                            .setInterpolator(FADE_OUT_INTERPOLATOR)

                            .setDuration(CROSS_FADE_DURATION_MS)

                            .setListener(new PreviewFrameAnimatorListener())

                            .withEndAction(new Runnable() {

                                @Override

                                public void run() {

                                    lastLayer.setVisibility(View.INVISIBLE);

            if (currentLayerIndex >= 0) {

                final View lastLayer = previewFrame.getChildAt(currentLayerIndex);

                if (mViewStubInflated[currentFrameIndex][currentLayerIndex]) {

                    // Explicitly set to INVISIBLE only when the stub has

                    // already been inflated.

                    if (previewFrame == mPreviewFrames[currentFrameIndex]) {

                        setVisibility(lastLayer, View.INVISIBLE, animate);

                    } else {

                        setVisibility(lastLayer, View.INVISIBLE, false);

                    }

                            });

                }

            }



            // Set next layer visible, as well as inflate necessary views.

            View nextLayer = previewFrame.getChildAt(newLayerIndex);

            if (previewFrame == mPreviewFrames[currentFrameIndex]) {

                // Inflate immediately if the stub has not yet been inflated.

                if (!mViewStubInflated[currentFrameIndex][newLayerIndex]) {

                    nextLayer = ((ViewStub) nextLayer).inflate();

                    nextLayer.setAlpha(0.0f);

                }

                setVisibility(nextLayer, View.VISIBLE, animate);

            } else {

                    lastLayer.setAlpha(0);

                    lastLayer.setVisibility(View.INVISIBLE);

                setVisibility(nextLayer, View.VISIBLE, false);

            }

        }

    }



            final View nextLayer = previewFrame.getChildAt(newIndex);

            if (animate && previewFrame == mPreviewFrames[currentItem]) {

                nextLayer.animate()

                        .alpha(1)

    private void setVisibility(final View view, final int visibility, boolean animate) {

        final float alpha = (visibility == View.VISIBLE ? 1.0f : 0.0f);

        if (!animate) {

            view.setAlpha(alpha);

            view.setVisibility(visibility);

        } else {

            final Interpolator interpolator = (visibility == View.VISIBLE ? FADE_IN_INTERPOLATOR

                    : FADE_OUT_INTERPOLATOR);

            if (visibility == View.VISIBLE) {

                // Fade in animation.

                view.animate()

                .alpha(alpha)

                .setInterpolator(FADE_IN_INTERPOLATOR)

                .setDuration(CROSS_FADE_DURATION_MS)

                .setListener(new PreviewFrameAnimatorListener())

                .withStartAction(new Runnable() {

                    @Override

                    public void run() {

                                nextLayer.setVisibility(View.VISIBLE);

                        view.setVisibility(visibility);

                    }

                });

            } else {

                nextLayer.setVisibility(View.VISIBLE);

                nextLayer.setAlpha(1);

                // Fade out animation.

                view.animate()

                .alpha(alpha)

                .setInterpolator(FADE_OUT_INTERPOLATOR)

                .setDuration(CROSS_FADE_DURATION_MS)

                .setListener(new PreviewFrameAnimatorListener())

                .withEndAction(new Runnable() {

                    @Override

                    public void run() {

                        view.setVisibility(visibility);

                    }

                });

            }

        }

    }