Android控件开发之Gallery3D酷炫效果（带源码），稳进大厂

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// TODO Auto-generated method stub

return Integer.MAX_VALUE;

}

@Override

public Object getItem(int position) {

// TODO Auto-generated method stub

return filmList.get(position);

// return position;

}

@Override

public long getItemId(int position) {

// TODO Auto-generated method stub

return position % filmList.size();

// return position;

}

@Override

public View getCoverFlowItem(int position, View reusableView,

ViewGroup parent) {

ImageView imageView = (ImageView) reusableView;

if (imageView == null) {

imageView = new ImageView(context);

}

Resources re = context.getResources();

InputStream is = re.openRawResource(filmList.get(position%filmList.size()).getRs());

// InputStream is = re.openRawResource(mImagesId[position%mImagesId.length]);

BitmapDrawable mapdraw = new BitmapDrawable(is);

Bitmap bitmap = mapdraw.getBitmap();

imageView.setImageBitmap(BitmapUtil.createReflectedBitmap(bitmap));

// imageView.setImageBitmap(bitmap);

// ps.电影海报宽高比例一般为3：4

imageView.setLayoutParams(new Gallery.LayoutParams(410, 713));

// // 异步加载图片

// imageLoader.displayImage(filmList.get(position % filmList.size())

// .getFilmImageLink(), imageView, options);

imageView.setScaleType(ScaleType.CENTER_CROP);

return imageView;

}

public Integer[] getImagesId(){

return mImagesId;

}

public void setImagesId(Integer[] mImagesId){

this.mImagesId = mImagesId;

}

private Integer mImagesId[] = {

R.drawable.ic_1,

R.drawable.ic_3,

R.drawable.ic_2,

R.drawable.ic_4,

R.drawable.ic_5

};

三：gallery 控件类

缩放，还有透明，等等都在这里设置

public class FancyCoverFlow extends Gallery {

public static final int ACTION_DISTANCE_AUTO = Integer.MAX_VALUE;

/**

• 图片向上突出，可以通过代码控制，也可以在xml上控制

*/

public static final float SCALEDOWN_GRAVITY_TOP = 0.0f;

/**

• 图片中间突出

*/

public static final float SCALEDOWN_GRAVITY_CENTER = 0.5f;

/**

• 图片向下突出

*/

public static final float SCALEDOWN_GRAVITY_BOTTOM = 1.0f;

private float reflectionRatio = 0.3f;

private int reflectionGap = 4;

private boolean reflectionEnabled = false;

private float unselectedAlpha;

private Camera transformationCamera;

private int maxRotation = 0;

private float unselectedScale;

private float scaleDownGravity = SCALEDOWN_GRAVITY_CENTER;

private int actionDistance;

private float unselectedSaturation;

public FancyCoverFlow(Context context) {

super(context);

this.initialize();

}

public FancyCoverFlow(Context context, AttributeSet attrs) {

super(context, attrs);

this.initialize();

this.applyXmlAttributes(attrs);

}

@SuppressLint(“NewApi”)

public FancyCoverFlow(Context context, AttributeSet attrs, int defStyle) {

super(context, attrs, defStyle);

if (Build.VERSION.SDK_INT >= 11) {

this.setLayerType(LAYER_TYPE_SOFTWARE, null);

}

this.initialize();

this.applyXmlAttributes(attrs);

}

private void initialize() {

this.transformationCamera = new Camera();

this.setSpacing(0);

}

private void applyXmlAttributes(AttributeSet attrs) {

TypedArray a = getContext().obtainStyledAttributes(attrs,

R.styleable.FancyCoverFlow);

this.actionDistance = a

.getInteger(R.styleable.FancyCoverFlow_actionDistance,

ACTION_DISTANCE_AUTO);

this.scaleDownGravity = a.getFloat(

R.styleable.FancyCoverFlow_scaleDownGravity, 0.5f);

this.maxRotation = a.getInteger(R.styleable.FancyCoverFlow_maxRotation,

0);

this.unselectedAlpha = a.getFloat(

R.styleable.FancyCoverFlow_unselectedAlpha, 0.5f);

this.unselectedSaturation = a.getFloat(

R.styleable.FancyCoverFlow_unselectedSaturation, 0.0f);

this.unselectedScale = a.getFloat(

R.styleable.FancyCoverFlow_unselectedScale, 0.75f);

}

public float getReflectionRatio() {

return reflectionRatio;

}

public void setReflectionRatio(float reflectionRatio) {

if (reflectionRatio <= 0 || reflectionRatio > 0.5f) {

throw new IllegalArgumentException(

“reflectionRatio may only be in the interval (0, 0.5]”);

}

this.reflectionRatio = reflectionRatio;

if (this.getAdapter() != null) {

((FancyCoverFlowAdapter) this.getAdapter()).notifyDataSetChanged();

}

}

public int getReflectionGap() {

return reflectionGap;

}

public void setReflectionGap(int reflectionGap) {

this.reflectionGap = reflectionGap;

if (this.getAdapter() != null) {

((FancyCoverFlowAdapter) this.getAdapter()).notifyDataSetChanged();

}

}

public boolean isReflectionEnabled() {

return reflectionEnabled;

}

public void setReflectionEnabled(boolean reflectionEnabled) {

this.reflectionEnabled = reflectionEnabled;

if (this.getAdapter() != null) {

((FancyCoverFlowAdapter) this.getAdapter()).notifyDataSetChanged();

}

}

@Override

public void setAdapter(SpinnerAdapter adapter) {

if (!(adapter instanceof FancyCoverFlowAdapter)) {

throw new ClassCastException(FancyCoverFlow.class.getSimpleName()

• " only works in conjunction with a "

• FancyCoverFlowAdapter.class.getSimpleName());

}

super.setAdapter(adapter);

}

public int getMaxRotation() {

return maxRotation;

}

public void setMaxRotation(int maxRotation) {

this.maxRotation = maxRotation;

}

public float getUnselectedAlpha() {

return this.unselectedAlpha;

}

public float getUnselectedScale() {

return unselectedScale;

}

public void setUnselectedScale(float unselectedScale) {

this.unselectedScale = unselectedScale;

}

public float getScaleDownGravity() {

return scaleDownGravity;

}

public void setScaleDownGravity(float scaleDownGravity) {

this.scaleDownGravity = scaleDownGravity;

}

public int getActionDistance() {

return actionDistance;

}

public void setActionDistance(int actionDistance) {

this.actionDistance = actionDistance;

}

@Override

public void setUnselectedAlpha(float unselectedAlpha) {

super.setUnselectedAlpha(unselectedAlpha);

this.unselectedAlpha = unselectedAlpha;

}

public float getUnselectedSaturation() {

return unselectedSaturation;

}

public void setUnselectedSaturation(float unselectedSaturation) {

this.unselectedSaturation = unselectedSaturation;

}

public int preLeftOffset = 0;

public int count = 0;

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ublic boolean isPlayDraw = true;

@Override

protected boolean getChildStaticTransformation(View child, Transformation t) {

FancyCoverFlowItemWrapper item = (FancyCoverFlowItemWrapper) child;

preLeftOffset = getChildAt(0).getLeft();

if (android.os.Build.VERSION.SDK_INT >= 16) {

item.postInvalidate();

}

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;

final int actionDistance = (this.actionDistance == ACTION_DISTANCE_AUTO) ? (int) ((coverFlowWidth + childWidth) / 2.0f)

this.actionDistance;

float effectsAmount = Math.min(

1.0f,

Math.max(-1.0f, (1.0f / actionDistance)

• (childCenter - coverFlowCenter)));

t.clear();

t.setTransformationType(Transformation.TYPE_BOTH);

if (this.unselectedAlpha != 1) {

final float alphaAmount = (this.unselectedAlpha - 1)

• Math.abs(effectsAmount) + 1;

t.setAlpha(alphaAmount);

}

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();

// 旋转角度不为0则开始图片旋转.

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();

}

// 缩放.

if (this.unselectedScale != 1) {

final float zoomAmount = 1f / 2f * (1 - Math.abs(effectsAmount))

• (1 - Math.abs(effectsAmount))

• (1 - Math.abs(effectsAmount)) + 0.5f;

final float translateX = childWidth / 2.0f;

final float translateY = childHeight * this.scaleDownGravity;

imageMatrix.preTranslate(-translateX, -translateY);

imageMatrix.postScale(zoomAmount, zoomAmount);

imageMatrix.postTranslate(translateX, translateY);

if (effectsAmount != 0) {

double point = 0.4;

double translateFactor = (-1f / (point * point)

• (Math.abs(effectsAmount) - point)

• (Math.abs(effectsAmount) - point) + 1)

• (effectsAmount > 0 ? 1 : -1);

imageMatrix

.postTranslate(

(float) (ViewUtil.Dp2Px(getContext(), 25) * translateFactor),

0);

}

}

return true;

}

// 绘制顺序，先从左到中间，再从右到中间

@Override

protected int getChildDrawingOrder(int childCount, int i) {

int selectedIndex = getSelectedItemPosition()

• getFirstVisiblePosition();

if (i < selectedIndex) {

return i;

} else if (i >= selectedIndex) {

return childCount - 1 - i + selectedIndex;

} else {

return i;

}

}

private boolean isTouchAble = true;

public void disableTouch() {

isTouchAble = false;

}

public void enableTouch() {

isTouchAble = true;

}

public boolean isTouchAble() {

return isTouchAble;

}

@Override

public boolean onTouchEvent(MotionEvent event) {

count = 0;

for (int i = 0; i < getChildCount(); i++) {

getChildAt(i).invalidate();

}

if (isTouchAble) {

return super.onTouchEvent(event);

} else {

return false;

}

}

@Override

public boolean onInterceptTouchEvent(MotionEvent event) {

if (isTouchAble) {

return super.onInterceptTouchEvent(event);

} else {

return true;

}

}

//

// @Override

// public boolean onSingleTapUp(MotionEvent e) {

// return false;

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