AndroidUI实践：Cover flow风格界面
2013-05-13 19:18 745 0
这个项目是给某个酒店做一个应用，酒店的电视是android系统的，所以，项目需求提出后，由于电视遥控器不如平时的键盘好用，只有上下左右等按钮，那么应该怎么设置主界面呢。突然想到了左右滑动的那种界面，
基本上如图所示：
各种折腾后，写了下面三个源文件，这种风格类似苹果的cover flow效果。废话不多说，上代码。
package com.test.util;
import com.dooya.activity.R;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.LinearGradient;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PorterDuffXfermode;
import android.graphics.Bitmap.Config;
import android.graphics.PorterDuff.Mode;
import android.graphics.Shader.TileMode;
import android.graphics.drawable.BitmapDrawable;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
public class ImageAdapter extends BaseAdapter {
int mGalleryItemBackground;
private Context mContext;
//加载资源图片
private Integer\[\] mImageIds = {
R.drawable.favorite,
R.drawable.room,
R.drawable.scene,
R.drawable.security,
R.drawable.time,
R.drawable.set};
public ImageAdapter(Context c) {
mContext = c;
}
public int getCount() {
return mImageIds.length;
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
ImageView i = createReflectedImages(mContext,mImageIds\[position\]);
i.setLayoutParams(new CoverFlow.LayoutParams(120, 100));
i.setScaleType(ImageView.ScaleType.CENTER_INSIDE);
// 设置的抗锯齿
BitmapDrawable drawable = (BitmapDrawable) i.getDrawable();
drawable.setAntiAlias(true);
return i;
}
public float getScale(boolean focused, int offset) {
return Math.max(0, 1.0f / (float) Math.pow(2, Math.abs(offset)));
}
/**
* 设置镜像图像
* @param mContext
* @param imageId
* <a href="http://my.oschina.net/u/556800" rel="nofollow" target="_blank">@return</a>
*/
public ImageView createReflectedImages(Context mContext,int imageId) {
Bitmap originalImage = BitmapFactory.decodeResource(mContext.getResources(), imageId);
final int reflectionGap = 4;
int width = originalImage.getWidth();
int height = originalImage.getHeight();
Matrix matrix = new Matrix();
matrix.preScale(1, -1);
Bitmap reflectionImage = Bitmap.createBitmap(originalImage, 0,
height / 2, width, height / 2, matrix, false);
Bitmap bitmapWithReflection = Bitmap.createBitmap(width,
(height + height / 2), Config.ARGB_8888);
Canvas canvas = new Canvas(bitmapWithReflection);
canvas.drawBitmap(originalImage, 0, 0, null);
Paint deafaultPaint = new Paint();
canvas.drawRect(0, height, width, height + reflectionGap, deafaultPaint);
canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null);
Paint paint = new Paint();
LinearGradient shader = new LinearGradient(0, originalImage
.getHeight(), 0, bitmapWithReflection.getHeight()
+ reflectionGap, 0x70ffffff, 0x00ffffff, TileMode.MIRROR);
paint.setShader(shader);
paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
canvas.drawRect(0, height, width, bitmapWithReflection.getHeight()
+ reflectionGap, paint);
ImageView imageView = new ImageView(mContext);
imageView.setImageBitmap(bitmapWithReflection);
return imageView;
}
}
package com.test.util;
import android.content.Context;
import android.graphics.Camera;
import android.graphics.Matrix;
import android.util.AttributeSet;
import android.view.View;
import android.view.animation.Transformation;
import android.widget.Gallery;
import android.widget.ImageView;
public class CoverFlow extends Gallery {
private Camera mCamera = new Camera();
private int mMaxRotationAngle = 50;//60;
private int mMaxZoom = -380;//-120;
private int mCoveflowCenter;
private boolean mAlphaMode = true;
private boolean mCircleMode = false;
public CoverFlow(Context context) {
super(context);
this.setStaticTransformationsEnabled(true);
}
public CoverFlow(Context context, AttributeSet attrs) {
super(context, attrs);
this.setStaticTransformationsEnabled(true);
}
public CoverFlow(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
this.setStaticTransformationsEnabled(true);
}
public int getMaxRotationAngle() {
return mMaxRotationAngle;
}
public void setMaxRotationAngle(int maxRotationAngle) {
mMaxRotationAngle = maxRotationAngle;
}
public boolean getCircleMode() {
return mCircleMode;
}
public void setCircleMode(boolean isCircle) {
mCircleMode = isCircle;
}
public boolean getAlphaMode() {
return mAlphaMode;
}
public void setAlphaMode(boolean isAlpha) {
mAlphaMode = isAlpha;
}
public int getMaxZoom() {
return mMaxZoom;
}
public void setMaxZoom(int maxZoom) {
mMaxZoom = maxZoom;
}
private int getCenterOfCoverflow() {
return (getWidth() - getPaddingLeft() - getPaddingRight()) / 2
+ getPaddingLeft();
}
private static int getCenterOfView(View view) {
return view.getLeft() + view.getWidth() / 2;
}
protected boolean getChildStaticTransformation(View child, Transformation t) {
final int childCenter = getCenterOfView(child);
final int childWidth = child.getWidth();
int rotationAngle = 0;
t.clear();
t.setTransformationType(Transformation.TYPE_MATRIX);
if (childCenter == mCoveflowCenter) {
transformImageBitmap((ImageView) child, t, 0);
} else {
rotationAngle = (int) (((float) (mCoveflowCenter - childCenter) / childWidth) * mMaxRotationAngle);
if (Math.abs(rotationAngle) > mMaxRotationAngle) {
rotationAngle = (rotationAngle < 0) ? -mMaxRotationAngle
: mMaxRotationAngle;
}
transformImageBitmap((ImageView) child, t, rotationAngle);
}
return true;
}
/**
*
*/
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
mCoveflowCenter = getCenterOfCoverflow();
super.onSizeChanged(w, h, oldw, oldh);
}
/**
* 把图像位图的角度通过
*/
private void transformImageBitmap(ImageView child, Transformation t,
int rotationAngle) {
mCamera.save();
final Matrix imageMatrix = t.getMatrix();
final int imageHeight = child.getLayoutParams().height;
final int imageWidth = child.getLayoutParams().width;
final int rotation = Math.abs(rotationAngle);
mCamera.translate(0.0f, 0.0f, 100.0f);
// 如视图的角度更少,放大
if (rotation <= mMaxRotationAngle) {
float zoomAmount = (float) (mMaxZoom + (rotation * 1.5));
mCamera.translate(0.0f, 0.0f, zoomAmount);
if (mCircleMode) {
if (rotation < 40)
mCamera.translate(0.0f, 155, 0.0f);
else
mCamera.translate(0.0f, (255 - rotation * 2.5f), 0.0f);
}
if (mAlphaMode) {
((ImageView) (child)).setAlpha((int) (255 - rotation * 2.5));
}
}
mCamera.rotateY(rotationAngle);
mCamera.getMatrix(imageMatrix);
imageMatrix.preTranslate(-(imageWidth / 2), -(imageHeight / 2));
imageMatrix.postTranslate((imageWidth / 2), (imageHeight / 2));
mCamera.restore();
}
}
package com.test.activity;
import android.app.Activity;
import android.os.Bundle;
import android.view.WindowManager;
import com.dooya.util.CoverFlow;
import com.dooya.util.ImageAdapter;
public class HomeActivity extends Activity {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
CoverFlow cf = new CoverFlow(this);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);// 设置全屏
cf.setBackgroundDrawable(this.getResources().getDrawable(R.drawable.bg));//背景
cf.setAdapter(new ImageAdapter(this));
ImageAdapter imageAdapter = new ImageAdapter(this);
cf.setAdapter(imageAdapter);
cf.setSelection(2, true);
cf.setAnimationDuration(1000);
setContentView(cf);
}
}
