[置顶] Android控件开发之Gallery3D酷炫效果（带源码）

   转载请注明出处：http://blog.csdn.net/u014608640/article/details/52472370

    前言：因为要做一个设置开机画面的功能，主要是让用户可以设置自己的开机画面，应用层需要做让用户选择开机画面图片的功能。所以需要做一个简单的图片浏览选择程序。最后选用Gallery作为基本控件。加入了一些炫一点的元素，做成3D滑动效果。下面是Demo例子截图：

效果网上已经很多人做出来了，只是这次需要用到，所以自己也实践了一下（这里例子我也是根据网上一些资料编写）。特下面针对一些关键代码进行简要说明，需要做这方面东西的朋友可以看看。这篇文章是实用性文章，理论分析不多。

 下面说下具体的类作用：

一：这个是主页：操作的内容不多，可以具体看一下

public class MainActivity extends Activity {

DisplayImageOptions options;

private ImageLoader imageLoader;

private FancyCoverFlow fancyCoverFlow;

private List<FilmInfo> filmList;

private ImageAdapter adapter;

private int cur_index = 0;
private int count_drawble;
private static int MSG_UPDATE = 1;
// 定时任务
private ScheduledExecutorService scheduledExecutorService;

// 通过handler来更新主界面
private Handler handler = new Handler() {

public void handleMessage(Message msg) {
if (msg.what == MSG_UPDATE) {
fancyCoverFlow.setSelection(cur_index);
}
}
};

public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
filmList = FilmInfoTest.getfilmInfo();
Log.i("INFO", filmList.size()+"条目数");
// 配置option
options = new DisplayImageOptions.Builder()
.showStubImage(R.drawable.logo)
.showImageForEmptyUri(R.drawable.logo)
.showImageOnFail(R.drawable.ic_error).cacheInMemory(true)
.cacheOnDisc(true).bitmapConfig(Bitmap.Config.RGB_565).build();

imageLoader = ImageLoader.getInstance();

adapter = new ImageAdapter(this, filmList, options, imageLoader);

fancyCoverFlow = (FancyCoverFlow) findViewById(R.id.fancyCoverFlow);

// item之间的间隙可以近似认为是imageview的宽度与缩放比例的乘积的一半
fancyCoverFlow.setSpacing(-180);
fancyCoverFlow.setAdapter(adapter);
fancyCoverFlow.setSelection(1002);
//		fancyCoverFlow.setActionDistance(10);

fancyCoverFlow.setOnItemSelectedListener(new OnItemSelectedListener() {

@Override
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id) {
cur_index = position;
}

@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});

// 点击事件
fancyCoverFlow.setOnItemClickListener(new OnItemClickListener() {

@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// TODO Auto-generated method stub
Toast.makeText(MainActivity.this,
filmList.get(position % filmList.size()).getFilmName(),
0).show();
}
});

//		// 开启自动轮播
//		count_drawble = adapter.getCount();
//		startPlay();
}

/**
* 开始轮播图切换
*/
private void startPlay() {
scheduledExecutorService = Executors.newSingleThreadScheduledExecutor();
scheduledExecutorService.scheduleAtFixedRate(new AutoPlayTask(), 1, 4,
TimeUnit.SECONDS);
}

/**
* 停止轮播图切换
*/
private void stopPlay() {
scheduledExecutorService.shutdown();
}

/**
* 执行轮播图切换任务
*
*/
private class AutoPlayTask implements Runnable {

@Override
public void run() {

//			cur_index = cur_index % count_drawble; // 图片区间[0,count_drawable)
//			Message msg = handler.obtainMessage(MSG_UPDATE);
//			handler.sendMessage(msg);
//			cur_index++;
}

}

@Override
protected void onStop() {
imageLoader.stop();
super.onStop();
}

二：适配器

这里我主要是用本地资源进行测试了一下，设置了倒影等等，当然，你也可以改为xml布局设置图片的

public class ImageAdapter extends FancyCoverFlowAdapter {
private Context context;
private List<FilmInfo> filmList;
//	private ImageLoader imageLoader;
//	private DisplayImageOptions options;

public ImageAdapter(Context context, List<FilmInfo> filmList,
DisplayImageOptions options, ImageLoader imageLoader) {
this.context = context;
this.filmList = filmList;
//		this.options = options;
//		this.imageLoader = imageLoader;
}

@Override
public int getCount() {
// 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;
public 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;
// }

// 使快速滑动失效
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY) {
return false;
}

四：倒影

reflectionGap 处理图片和倒影之间的间距。

/**
* grallery 倒影放大操作类
*/
public class MyImgView {

/**
* 添加倒影，原理，先翻转图片，由上到下放大透明度
*
* @param originalImage
* @return
*/
public static Bitmap createReflectedImage(Bitmap originalImage) {
// The gap we want between the reflection and the original image
final int reflectionGap = 4;

int width = originalImage.getWidth();
int height = originalImage.getHeight();

// This will not scale but will flip on the Y axis
Matrix matrix = new Matrix();
matrix.preScale(1, -1);

// Create a Bitmap with the flip matrix applied to it.
// We only want the bottom half of the image
Bitmap reflectionImage = Bitmap.createBitmap(originalImage, 0,
height / 2, width, height / 2, matrix, false);

// Create a new bitmap with same width but taller to fit reflection
Bitmap bitmapWithReflection = Bitmap.createBitmap(width,
(height + height /4), Config.ARGB_8888);

// Create a new Canvas with the bitmap that's big enough for
// the image plus gap plus reflection
Canvas canvas = new Canvas(bitmapWithReflection);
// Draw in the original image
canvas.drawBitmap(originalImage, 0, 0, null);
// Draw in the gap
Paint defaultPaint = new Paint();
canvas.drawRect(0, height, width, height + reflectionGap, defaultPaint);
// Draw in the reflection
canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null);

// Create a shader that is a linear gradient that covers the reflection
Paint paint = new Paint();
LinearGradient shader = new LinearGradient(0,
originalImage.getHeight(), 0, bitmapWithReflection.getHeight()
+ reflectionGap, 0x70ffffff, 0x00ffffff, TileMode.CLAMP);
// Set the paint to use this shader (linear gradient)
paint.setShader(shader);
// Set the Transfer mode to be porter duff and destination in 倒影底部颜色深浅变化
paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
// Draw a rectangle using the paint with our linear gradient
canvas.drawRect(0, height, width, bitmapWithReflection.getHeight()
+ reflectionGap, paint);

return bitmapWithReflection;
}
//drawable 类型转化为bitmap
public static Bitmap drawableToBitmap(Drawable drawable) {

Bitmap bitmap = Bitmap
.createBitmap(
drawable.getIntrinsicWidth(),
drawable.getIntrinsicHeight(),
drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888
: Bitmap.Config.RGB_565);
Canvas canvas = new Canvas(bitmap);
// canvas.setBitmap(bitmap);
drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable
.getIntrinsicHeight());
drawable.draw(canvas);
return bitmap;
}

Ps：主要就是这些个类，大家可以修改成为自己想要的效果，如有问题，可以评论问我！

具体下载地址：Android 控制3D酷炫效果