Example usage for android.view.animation Transformation setAlpha

Introduction

In this page you can find the example usage for android.view.animation Transformation setAlpha.

Prototype

public void setAlpha(@FloatRange(from = 0.0, to = 1.0) float alpha) 

Source Link

Document

Sets the degree of transparency

Usage

From source file:com.actionbarsherlock.internal.nineoldandroids.view.animation.AnimatorProxy.java

@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
    View view = mView.get();/*from  w  w  w  .j  a va  2 s .c  o  m*/
    if (view != null) {
        t.setAlpha(mAlpha);
        transformMatrix(t.getMatrix(), view);
    }
}

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From source file:android.widget.Gallery.java

@Override
protected boolean getChildStaticTransformation(View child, Transformation t) {

    t.clear();//from   w  w w.j a v a 2s .c  o m
    t.setAlpha(child == mSelectedChild ? 1.0f : mUnselectedAlpha);

    return true;
}

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From source file:com.inmobi.nativead.sample.photopages.CustomViewPager.java

@Override
protected boolean getChildStaticTransformation(View child, Transformation t) {
    // We can cast here because CustomPagerAdapter only creates wrappers.
    CustomViewPagerItemWrapper item = (CustomViewPagerItemWrapper) child;

    // Since Jelly Bean children won't get invalidated automatically,
    // needs to be added for the smooth coverflow animation
    if (android.os.Build.VERSION.SDK_INT >= 16) {
        item.invalidate();/*from  w ww  .  ja  v a2s.  c o  m*/
    }

    final int coverFlowWidth = this.getWidth();
    final int coverFlowCenter = coverFlowWidth / 2;
    final int childWidth = item.getWidth();
    final int childHeight = item.getHeight();
    final int childCenter = item.getLeft() + childWidth / 2;

    // Use coverflow width when its defined as automatic.
    final int actionDistance = (this.actionDistance == ACTION_DISTANCE_AUTO)
            ? (int) ((coverFlowWidth + childWidth) / 2.0f)
            : this.actionDistance;

    // Calculate the abstract amount for all effects.
    final float effectsAmount = Math.min(1.0f,
            Math.max(-1.0f, (1.0f / actionDistance) * (childCenter - coverFlowCenter)));

    // Clear previous transformations and set transformation type (matrix + alpha).
    t.clear();
    t.setTransformationType(Transformation.TYPE_BOTH);

    // Alpha
    if (this.unselectedAlpha != 1) {
        final float alphaAmount = (this.unselectedAlpha - 1) * Math.abs(effectsAmount) + 1;
        t.setAlpha(alphaAmount);
    }

    // Saturation
    if (this.unselectedSaturation != 1) {
        // Pass over saturation to the wrapper.
        final float saturationAmount = (this.unselectedSaturation - 1) * Math.abs(effectsAmount) + 1;
        item.setSaturation(saturationAmount);
    }

    final Matrix imageMatrix = t.getMatrix();

    // Apply rotation.
    if (this.maxRotation != 0) {
        final int rotationAngle = (int) (-effectsAmount * this.maxRotation);
        this.transformationCamera.save();
        this.transformationCamera.rotateY(rotationAngle);
        this.transformationCamera.getMatrix(imageMatrix);
        this.transformationCamera.restore();
    }

    // Zoom.
    if (this.unselectedScale != 1) {
        final float zoomAmount = (this.unselectedScale - 1) * Math.abs(effectsAmount) + 1;
        // Calculate the scale anchor (y anchor can be altered)
        final float translateX = childWidth / 2.0f;
        final float translateY = childHeight * this.scaleDownGravity;
        imageMatrix.preTranslate(-translateX, -translateY);
        imageMatrix.postScale(zoomAmount, zoomAmount);
        imageMatrix.postTranslate(translateX, translateY);
    }

    return true;
}

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