為了實現(xiàn)毛玻璃效果,我們需要一組compute kernels(.rs文件中編寫),及一組用于控制renderScript相關(guān)的Javaapi(.rs文件自動生成為Java類)。 由于compute kernels的編寫需要一定的學(xué)習(xí)成本,從JELLY_BEAN_MR1開始,Androied內(nèi)置了一些compute kernels用于常用的操作,其中就包括了Gaussian blur。
下面,通過實操來講解一下RenderScript來實現(xiàn)高斯模糊,最終實現(xiàn)效果(講文字背景進(jìn)行模糊處理):


實現(xiàn)代碼:
<html><head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"></head><body><textarea style="width:99%;height:99%">private void applyBlur() { image.getViewTreeObserver().addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() { @Override public boolean onPreDraw() { image.getViewTreeObserver().removeOnPreDrawListener(this); image.buildDrawingCache(); Bitmap bmp = image.getDrawingCache(); blur(bmp, text, true); return true; } }); } @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR1) private void blur(Bitmap bkg, View view) { long startMs = System.currentTimeMillis(); float radius = 20; Bitmap overlay = Bitmap.createBitmap((int)(view.getMeasuredWidth()), (int)(view.getMeasuredHeight()), Bitmap.Config.ARGB_8888); Canvas canvas = new Canvas(overlay); canvas.translate(-view.getLeft(), -view.getTop()); canvas.drawBitmap(bkg, 0, 0, null); RenderScript rs = RenderScript.create(SecondActivity.this); Allocation overlayAlloc = Allocation.createFromBitmap(rs, overlay); ScriptIntrinsicBlur blur = ScriptIntrinsicBlur.create(rs, overlayAlloc.getElement()); blur.setInput(overlayAlloc); blur.setRadius(radius); blur.forEach(overlayAlloc); overlayAlloc.copyTo(overlay); view.setBackground(new BitmapDrawable(getResources(), overlay)); rs.destroy(); statusText.setText("cost " + (System.currentTimeMillis() - startMs) + "ms"); }</textarea></body></html> 布局如下:
<?xml version="1.0" encoding="utf-8"?><FrameLayout xmlns:Android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent" > <ImageView android:id="@+id/picture" android:layout_width="match_parent" android:layout_height="match_parent" android:src="@drawable/splash" android:scaleType="centerCrop" /> <TextView android:id="@+id/text" android:gravity="center_horizontal" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Gaussian Blur" android:textColor="@android:color/black" android:layout_gravity="center_vertical" android:textStyle="bold" android:textSize="48sp" /> <LinearLayout android:id="@+id/controls" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="#7f000000" android:orientation="vertical" android:layout_gravity="bottom" /></FrameLayout>
以上所述是小編給大家介紹的Android中實現(xiàn)iOS中的毛玻璃效果,希望對大家有所幫助,如果大家有任何疑問請給我留言,小編會及時回復(fù)大家的。在此也非常感謝大家對武林網(wǎng)網(wǎng)站的支持!
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