ImageView倒影效果的两种方法
第一种:
写个图片的工具类,在Activity中用java代码调用ImageView组件的setImageBitmap(Bitmap bitmap)方法。
下面是图片工具类:
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.LinearGradient;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.PorterDuff.Mode;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.Shader.TileMode;
import android.graphics.drawable.Drawable;
public class ImageUtils {
/**
* 从SDCard上读取图片
* @param pathName
* @return */
public static Bitmap getBitmapFromSDCard(String pathName) {
return BitmapFactory.decodeFile(pathName);
}
/**
* 缩放图片
* @param bitmap
* @param width
* @param height
* @return */
public static Bitmap zoomBitmap(Bitmap bitmap, int width, int height) {
int w = bitmap.getWidth();
int h = bitmap.getHeight();
Matrix matrix = new Matrix();
matrix.postScale((float) width / w, (float) height / h);
return Bitmap.createBitmap(bitmap, 0, 0, w, h, matrix, true);
}
/**
* 将Drawable转化为Bitmap
* @param drawable
* @return
*/
public static Bitmap drawableToBitmap(Drawable drawable) {
int width = drawable.getIntrinsicWidth();
int height = drawable.getIntrinsicHeight();
Bitmap bitmap = Bitmap.createBitmap(width, height, drawable
.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888
: Bitmap.Config.RGB_565);
Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0, 0, width, height);
drawable.draw(canvas);
return bitmap;
}
/**
* 获得圆角图片
* @param bitmap
* @param roundPx
* @return
*/
public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, float roundPx) {
Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap
.getHeight(), Config.ARGB_8888);
Canvas canvas = new Canvas(output);
final Paint paint = new Paint();
final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
final RectF rectF = new RectF(rect);
canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(bitmap, rect, rect, paint);
return output;
}
/**
* 获得带倒影的图片
* @param bitmap
* @return
*/
public static Bitmap getReflectionImageWithOrigin(Bitmap bitmap) {
// 原始图片和反射图片中间的间距
final int reflectionGap = 0;
int width = bitmap.getWidth();
int height = bitmap.getHeight();
// 反转
Matrix matrix = new Matrix();
// 第一个参数为1表示x方向上以原比例为准保持不变,正数表示方向不变。
// 第二个参数为-1表示y方向上以原比例为准保持不变,负数表示方向取反。
matrix.preScale(1, -1);
Bitmap reflectionImage = Bitmap.createBitmap(bitmap, 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(bitmap, 0, 0, null);
Paint defaultPaint = new Paint();
canvas.drawRect(0, height, width, height + reflectionGap, defaultPaint);
canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null);
Paint paint = new Paint();
LinearGradient shader = new LinearGradient(0, bitmap.getHeight(), 0,
bitmapWithReflection.getHeight() + reflectionGap, 0x70ffffff,
0x00ffffff, TileMode.CLAMP);
paint.setShader(shader);
paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
canvas.drawRect(0, height, width, bitmapWithReflection.getHeight()
+ reflectionGap, paint);
return bitmapWithReflection;
}
}
在Activity中这样调用,先获取XML文件中定义的Imageview对象
image = (ImageView) findViewById(R.id.movie);
然后将获取到的Imageview对象转化为Bitmap类型
Bitmap imageBit = ((BitmapDrawable) image.getDrawable()).getBitmap();
接着调用图片工具类中的方法,返回一个Bitmap对象,将这个Bitmap对象放置在ImageView中
Bitmap m = ImageUtils.getReflectionImageWithOrigin(imageBit);
image.setImageBitmap(m);
第二种
继承ImageView类
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.util.AttributeSet;
import android.widget.ImageView;
public class ReflectImageView extends ImageView {
private Bitmap originalBitmap;
public ReflectImageView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public ReflectImageView(Context context) {
this(context, null, 0);
}
public ReflectImageView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
DoReflection(((BitmapDrawable) getDrawable()).getBitmap());
}
@Override
public void setImageBitmap(Bitmap bm) {
DoReflection(bm);
}
/** 显示倒影效果的setImageBitmap函数 */
public void setImageBitmap(Bitmap bm, boolean isFlected) {
if (isFlected) {
super.setImageBitmap(bm);
}
}
@Override
public void setImageResource(int resId) {
originalBitmap = BitmapFactory.decodeResource(getResources(), resId);
DoReflection(originalBitmap);
}
private void DoReflection(Bitmap bitmap) {
final int reflectionGap = 0;
int width = bitmap.getWidth();
int height = bitmap.getHeight();
Matrix matrix = new Matrix();
matrix.preScale(1, -1);
Bitmap reflectionImage = Bitmap.createBitmap(bitmap, 0, height / 2,
width, height / 2, matrix, false);
Bitmap bitmap4Reflection = Bitmap.createBitmap(width,
(height + height / 2), Config.ARGB_8888);
Canvas canvasRef = new Canvas(bitmap4Reflection);
Paint deafaultPaint = new Paint();
deafaultPaint.setAntiAlias(true);
canvasRef.drawBitmap(bitmap, 0, 0, null);
canvasRef.drawRect(0, height, width, height + reflectionGap,
deafaultPaint);
canvasRef.drawBitmap(reflectionImage, 0, height + reflectionGap, null);
Paint paint = new Paint();
LinearGradient shader = new LinearGradient(0, bitmap.getHeight(), 0,
bitmap4Reflection.getHeight() + reflectionGap, 0x70ffffff,
0x00ffffff, TileMode.CLAMP);
paint.setShader(shader);
paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
canvasRef.drawRect(0, height, width, bitmap4Reflection.getHeight()
+ reflectionGap, paint);
this.setImageBitmap(bitmap4Reflection, true);
}
}
然后在xml文件里面配置
<com.hello.ReflectImageView
android:id="@+id/imageView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@+drawable/button1" />
其中
com.hello.ReflectImageView
是继承类的完整包名
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