2、android的圖片資源默認(rèn)是靜態(tài)的,單實(shí)例;如果兩個(gè)IM好友的頭像一樣,最簡(jiǎn)單的都是用的軟件自帶頭像,有一個(gè)在線,一個(gè)離線,直接改變頭像的灰度,則兩個(gè)用戶的頭像都會(huì)變灰或者在線,答案是:Drawable.mutate()。
- Drawable mDrawable = context.getResources().getDrawable(R.drawable.face_icon);
- //Make this drawable mutable.
- //A mutable drawable is guaranteed to not share its state with any other drawable.
- mDrawable.mutate();
- ColorMatrix cm = new ColorMatrix();
- cm.setSaturation(0);
- ColorMatrixColorFilter cf = new ColorMatrixColorFilter(cm);
- mDrawable.setColorFilter(cf);
- //Android Matrix類實(shí)現(xiàn)鏡像方法
- public void drawRegion(Image image_src,
- int x_src, int y_src,
- int width, int height,
- int transform,
- int x_dest, int y_dest,
- int anchor){
- if((anchor&VCENTER) != 0){
- y_dest -= height/2;
- }else if((anchor&BOTTOM) != 0){
- y_dest -= height;
- }
- if((anchor&RIGHT) != 0){
- x_dest -= width;
- }else if((anchor&HCENTER) != 0){
- x_dest -= width/2;
- }
- Bitmap newMap = Bitmap.createBitmap(image_src.getBitmap(), x_src, y_src, width, height);
- Matrix mMatrix = new Matrix();
- Matrix temp = new Matrix();
- Matrix temp2 = new Matrix();
- float[] mirrorY = {
- -1, 0, 0,
- 0, 1, 0,
- 0, 0, 1
- };
- temp.setValues(mirrorY);
- switch(transform){
- case Sprite.TRANS_NONE:
- break;
- case Sprite.TRANS_ROT90:
- mMatrix.setRotate(90,width/2, height/2);
- break;
- case Sprite.TRANS_ROT180:
- mMatrix.setRotate(180,width/2, height/2);
- break;
- case Sprite.TRANS_ROT270:
- mMatrix.setRotate(270,width/2, height/2);
- break;
- case Sprite.TRANS_MIRROR:
- mMatrix.postConcat(temp);
- break;
- case Sprite.TRANS_MIRROR_ROT90:
- mMatrix.postConcat(temp);
- mMatrix.setRotate(90,width/2, height/2);
- break;
- case Sprite.TRANS_MIRROR_ROT180:
- mMatrix.postConcat(temp);
- mMatrix.setRotate(180,width/2, height/2);
- break;
- case Sprite.TRANS_MIRROR_ROT270:
- mMatrix.postConcat(temp);
- mMatrix.setRotate(270,width/2, height/2);
- break;
- }
- mMatrix.setTranslate(x_dest, y_dest);
- canvas.drawBitmap(newMap, mMatrix, mPaint);
- }
- //圖片Url保存為位圖并進(jìn)行縮放操作
- //通過(guò)傳入圖片url獲取位圖方法
- public Bitmap returnBitMap(String url) {
- URL myFileUrl = null;
- Bitmap bitmap = null;
- try {
- myFileUrl = new URL(url);
- } catch (MalformedURLException e) {
- e.printStackTrace();
- }
- try {
- HttpURLConnection conn = (HttpURLConnection) myFileUrl
- .openConnection();
- conn.setDoInput(true);
- conn.connect();
- InputStream is = conn.getInputStream();
- bitmap = BitmapFactory.decodeStream(is);
- is.close();
- } catch (IOException e) {
- e.printStackTrace();
- }
- Log.v(tag, bitmap.toString());
- return bitmap;
- }
- //通過(guò)傳入位圖,新的寬.高比進(jìn)行位圖的縮放操作
- public static Drawable resizeImage(Bitmap bitmap, int w, int h) {
- // load the origial Bitmap
- Bitmap BitmapOrg = bitmap;
- int width = BitmapOrg.getWidth();
- int height = BitmapOrg.getHeight();
- int newWidth = w;
- int newHeight = h;
- Log.v(tag, String.valueOf(width));
- Log.v(tag, String.valueOf(height));
- Log.v(tag, String.valueOf(newWidth));
- Log.v(tag, String.valueOf(newHeight));
- // calculate the scale
- float scaleWidth = ((float) newWidth) / width;
- float scaleHeight = ((float) newHeight) / height;
- // create a matrix for the manipulation
- Matrix matrix = new Matrix();
- // resize the Bitmap
- matrix.postScale(scaleWidth, scaleHeight);
- // if you want to rotate the Bitmap
- // matrix.postRotate(45);
- // recreate the new Bitmap
- Bitmap resizedBitmap = Bitmap.createBitmap(BitmapOrg, 0, 0, width,
- height, matrix, true);
- // make a Drawable from Bitmap to allow to set the Bitmap
- // to the ImageView, ImageButton or what ever
- return new BitmapDrawable(resizedBitmap);
- }
- 1.圖片加載方法,方便用戶加載圖片
- /***
- * 加載本地圖片
- * @param context:主運(yùn)行函數(shù)實(shí)例
- * @param bitAdress:圖片地址,一般指向R下的drawable目錄
- * @return
- */
- public final Bitmap CreatImage(Context context, int bitAdress) {
- Bitmap bitmaptemp = null;
- bitmaptemp = BitmapFactory.decodeResource(context.getResources(),
- bitAdress);
- return bitmaptemp;
- }
- 2.圖片平均分割方法,將大圖平均分割為N行N列,方便用戶使用
- /***
- * 圖片分割
- *
- * @param g
- * :畫布
- * @param paint
- * :畫筆
- * @param imgBit
- * :圖片
- * @param x
- * :X軸起點(diǎn)坐標(biāo)
- * @param y
- * :Y軸起點(diǎn)坐標(biāo)
- * @param w
- * :?jiǎn)我粓D片的寬度
- * @param h
- * :?jiǎn)我粓D片的高度
- * @param line
- * :第幾列
- * @param row
- * :第幾行
- */
- public final void cuteImage(Canvas g, Paint paint, Bitmap imgBit, int x,
- int y, int w, int h, int line, int row) {
- g.clipRect(x, y, x + w, h + y);
- g.drawBitmap(imgBit, x – line * w, y – row * h, paint);
- g.restore();
- }
- 3.圖片縮放,對(duì)當(dāng)前圖片進(jìn)行縮放處理
- /***
- * 圖片的縮放方法
- *
- * @param bgimage
- * :源圖片資源
- * @param newWidth
- * :縮放后寬度
- * @param newHeight
- * :縮放后高度
- * @return
- */
- public Bitmap zoomImage(Bitmap bgimage, int newWidth, int newHeight) {
- // 獲取這個(gè)圖片的寬和高
- int width = bgimage.getWidth();
- int height = bgimage.getHeight();
- // 創(chuàng)建操作圖片用的matrix對(duì)象
- Matrix matrix = new Matrix();
- // 計(jì)算縮放率,新尺寸除原始尺寸
- float scaleWidth = ((float) newWidth) / width;
- float scaleHeight = ((float) newHeight) / height;
- // 縮放圖片動(dòng)作
- matrix.postScale(scaleWidth, scaleHeight);
- Bitmap bitmap = Bitmap.createBitmap(bgimage, 0, 0, width, height,
- matrix, true);
- return bitmap;
- }
- 4.繪制帶有邊框的文字,一般在游戲中起文字的美化作用
- /***
- * 繪制帶有邊框的文字
- *
- * @param strMsg
- * :繪制內(nèi)容
- * @param g
- * :畫布
- * @param paint
- * :畫筆
- * @param setx
- * ::X軸起始坐標(biāo)
- * @param sety
- * :Y軸的起始坐標(biāo)
- * @param fg
- * :前景色
- * @param bg
- * :背景色
- */
- public void drawText(String strMsg, Canvas g, Paint paint, int setx,
- int sety, int fg, int bg) {
- paint.setColor(bg);
- g.drawText(strMsg, setx + 1, sety, paint);
- g.drawText(strMsg, setx, sety – 1, paint);
- g.drawText(strMsg, setx, sety + 1, paint);
- g.drawText(strMsg, setx – 1, sety, paint);
- paint.setColor(fg);
- g.drawText(strMsg, setx, sety, paint);
- g.restore();
- }
- 5.Android 圖片透明度處理代碼
- /**
- * 圖片透明度處理
- *
- * @param sourceImg
- * 原始圖片
- * @param number
- * 透明度
- * @return
- */
- public static Bitmap setAlpha(Bitmap sourceImg, int number) {
- int[] argb = new int[sourceImg.getWidth() * sourceImg.getHeight()];
- sourceImg.getPixels(argb, 0, sourceImg.getWidth(), 0, 0,sourceImg.getWidth(), sourceImg.getHeight());// 獲得圖片的ARGB值
- number = number * 255 / 100;
- for (int i = 0; i < argb.length; i++) {
- argb = (number << 24) | (argb & 0×00FFFFFF);// 修改最高2位的值
- }
- sourceImg = Bitmap.createBitmap(argb, sourceImg.getWidth(), sourceImg.getHeight(), Config.ARGB_8888);
- return sourceImg;
- }
- 6.圖片翻轉(zhuǎn)
- Resources res = this.getContext().getResources();
- img = BitmapFactory.decodeResource(res, R.drawable.slogo);
- Matrix matrix = new Matrix();
- matrix.postRotate(90); /*翻轉(zhuǎn)90度*/
- int width = img.getWidth();
- int height = img.getHeight();
- r_img = Bitmap.createBitmap(img, 0, 0, width, height, matrix, true);
- import android.graphics.Bitmap;
- import android.graphics.Canvas;
- import android.graphics.LinearGradient;
- import android.graphics.Matrix;
- import android.graphics.Paint;
- import android.graphics.PixelFormat;
- import android.graphics.PorterDuffXfermode;
- import android.graphics.Rect;
- import android.graphics.RectF;
- import android.graphics.Bitmap.Config;
- import android.graphics.PorterDuff.Mode;
- import android.graphics.Shader.TileMode;
- import android.graphics.drawable.Drawable;
- /**
- *
- * @author superdev
- * @version 1.0
- *
- */
- public class ImageUtil {
- /**
- * 放大縮小圖片
- */
- public static Bitmap zoomBitmap(Bitmap bitmap, int w, int h) {
- int width = bitmap.getWidth();
- int height = bitmap.getHeight();
- Matrix matrix = new Matrix();
- float scaleWidht = ((float) w / width);
- float scaleHeight = ((float) h / height);
- matrix.postScale(scaleWidht, scaleHeight);
- Bitmap newbmp = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true);
- return newbmp;
- }
- /**
- * 將Drawable轉(zhuǎn)化為Bitmap
- */
- 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;
- }
- /**
- * 獲得圓角圖片的方法
- */
- 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 int color = 0xff424242;
- final Paint paint = new Paint();
- final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
- final RectF rectF = new RectF(rect);
- paint.setAntiAlias(true);
- canvas.drawARGB(0, 0, 0, 0);
- paint.setColor(color);
- canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
- paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
- canvas.drawBitmap(bitmap, rect, rect, paint);
- return output;
- }
- /**
- * 獲得帶倒影的圖片方法
- */
- public static Bitmap createReflectionImageWithOrigin(Bitmap bitmap) {
- final int reflectionGap = 4;
- 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 bitmapWithReflection = Bitmap.createBitmap(width, (height + height / 2), Config.ARGB_8888);
- Canvas canvas = new Canvas(bitmapWithReflection);
- canvas.drawBitmap(bitmap, 0, 0, null);
- Paint deafalutPaint = new Paint();
- canvas.drawRect(0, height, width, height + reflectionGap, deafalutPaint);
- 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);
- // Set the Transfer mode to be porter duff and destination in
- 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;
- }
- }
- private byte[] Bitmap2Bytes(Bitmap bm){
- ByteArrayOutputStream baos = new ByteArrayOutputStream();
- bm.compress(Bitmap.CompressFormat.PNG, 100, baos);
- return baos.toByteArray();
- }
- private Bitmap Bytes2Bimap(byte[] b){
- if(b.length!=0){
- return BitmapFactory.decodeByteArray(b, 0, b.length);
- }
- else {
- return null;
- }
- }
- /**
- * create the bitmap from a byte array
- *生成水印圖片
- * @param src the bitmap object you want proecss
- * @param watermark the water mark above the src
- * @return return a bitmap object ,if paramter's length is 0,return null
- */
- private Bitmap createBitmap( Bitmap src, Bitmap watermark )
- {
- String tag = "createBitmap";
- Log.d( tag, "create a new bitmap" );
- if( src == null )
- {
- return null;
- }
- int w = src.getWidth();
- int h = src.getHeight();
- int ww = watermark.getWidth();
- int wh = watermark.getHeight();
- //create the new blank bitmap
- Bitmap newb = Bitmap.createBitmap( w, h, Config.ARGB_8888 );//創(chuàng)建一個(gè)新的和SRC長(zhǎng)度寬度一樣的位圖
- Canvas cv = new Canvas( newb );
- //draw src into
- cv.drawBitmap( src, 0, 0, null );//在 0,0坐標(biāo)開(kāi)始畫入src
- //draw watermark into
- cv.drawBitmap( watermark, w - ww + 5, h - wh + 5, null );//在src的右下角畫入水印
- //save all clip
- cv.save( Canvas.ALL_SAVE_FLAG );//保存
- //store
- cv.restore();//存儲(chǔ)
- return newb;
- }
- /** 重新編碼Bitmap
- *
- * @param src
- * 需要重新編碼的Bitmap
- *
- * @param format
- * 編碼后的格式(目前只支持png和jpeg這兩種格式)
- *
- * @param quality
- * 重新生成后的bitmap的質(zhì)量
- *
- * @return
- * 返回重新生成后的bitmap
- */
- private static Bitmap codec(Bitmap src, Bitmap.CompressFormat format,
- int quality) {
- ByteArrayOutputStream os = new ByteArrayOutputStream();
- src.compress(format, quality, os);
- byte[] array = os.toByteArray();
- return BitmapFactory.decodeByteArray(array, 0, array.length);
- }
- //Stream轉(zhuǎn)換成Byte
- static byte[] streamToBytes(InputStream is) {
- ByteArrayOutputStream os = new ByteArrayOutputStream(1024);
- byte[] buffer = new byte[1024];
- int len;
- try {
- while ((len = is.read(buffer)) >= 0) {
- os.write(buffer, 0, len);
- }
- } catch (java.io.IOException e) {
- }
- return os.toByteArray();
- }
- //把View轉(zhuǎn)換成Bitmap
- /**
- * 把一個(gè)View的對(duì)象轉(zhuǎn)換成bitmap
- */
- static Bitmap getViewBitmap(View v) {
- v.clearFocus();
- v.setPressed(false);
- //能畫緩存就返回false
- boolean willNotCache = v.willNotCacheDrawing();
- v.setWillNotCacheDrawing(false);
- int color = v.getDrawingCacheBackgroundColor();
- v.setDrawingCacheBackgroundColor(0);
- if (color != 0) {
- v.destroyDrawingCache();
- }
- v.buildDrawingCache();
- Bitmap cacheBitmap = v.getDrawingCache();
- if (cacheBitmap == null) {
- Log.e(TAG, "failed getViewBitmap(" + v + ")", new RuntimeException());
- return null;
- }
- Bitmap bitmap = Bitmap.createBitmap(cacheBitmap);
- // Restore the view
- v.destroyDrawingCache();
- v.setWillNotCacheDrawing(willNotCache);
- v.setDrawingCacheBackgroundColor(color);
- return bitmap;
- }
- 讀取raw資源文件中的mp3文件,然后通過(guò)音樂(lè)播放器播放:
- /**
- * 把mp3文件寫入卡
- *
- * @param fileName
- * 輸出的文件名(全路徑)
- * @param context
- * context對(duì)象
- */
- private void writeMP3ToSDcard(String fileName, Context context) {
- byte[] buffer = new byte[1024 * 8];
- int read;
- BufferedInputStream bin = new BufferedInputStream(context.getResources().openRawResource(R.raw.ring));
- try {
- BufferedOutputStream bout = new BufferedOutputStream(new FileOutputStream(fileName));
- while ((read = bin.read(buffer)) > -1) {
- bout.write(buffer, 0, read);
- }
- bout.flush();
- bout.close();
- bin.close();
- } catch (FileNotFoundException e) {
- e.printStackTrace();
- } catch (IOException e) {
- e.printStackTrace();
- }
- }
- Intent intent = new Intent();
- intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
- intent.setAction(android.content.Intent.ACTION_VIEW);
- intent.setDataAndType(Uri.fromFile(newFile("XXXXmp3的文件全路徑")),"audio/*");
- startActivity(intent);
繪制圖像倒影
- private void
- _Init()
- {
- m_paint = new Paint(Paint.ANTI_ALIAS_FLAG);
- LinearGradient lg = new LinearGradient(
- 0, 0, 0, m_nShadowH,
- 0xB0FFFFFF, 0x00000000,
- Shader.TileMode.CLAMP);
- m_paint.setShader(lg);
- m_paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.MULTIPLY));
- }
- @Override protected void
- onDraw(Canvas canvas)
- {
- super.onDraw(canvas);
- int nX = 0;
- int nY = 20;
- _DrawNormalImg(canvas, nX, nY);
- _DrawMirror(canvas, nX, nY);
- }
- private void
- _DrawNormalImg(Canvas canvas, int nX, int nY)
- {
- canvas.save(Canvas.MATRIX_SAVE_FLAG);
- canvas.translate(nX, nY);
- m_dw.draw(canvas);
- canvas.restore();
- }
- private void
- _DrawMirror(Canvas canvas, int nX, int nY)
- {
- int nW = m_dw.getIntrinsicWidth();
- int nH = m_dw.getIntrinsicHeight();
- ///////////////////////////////////
- //draw mirror image
- canvas.save(Canvas.MATRIX_SAVE_FLAG);
- canvas.scale(1.0f, -1.0f);
- canvas.translate(nX, -(nY + nH * 2));
- canvas.clipRect(0, nH, nW, nH - m_nShadowH);
- m_dw.draw(canvas);
- canvas.restore();
- //////////////////////////////
- //draw mask
- canvas.save();
- canvas.translate(nX, nY + nH);
- canvas.drawRect(0, 0, nW, m_nShadowH, m_paint);
- canvas.restore();
- }
Android 繪圖座標(biāo)體系預(yù)設(shè)的原點(diǎn)在左上角,X 軸往右是越來(lái)越大的正值,而 Y 軸往下,則是越來(lái)越大的正值。要畫出垂直翻轉(zhuǎn)的圖片,其實(shí)也就是要垂直翻轉(zhuǎn)整個(gè)繪圖座標(biāo)體系。在 Android 中,要如何做?答案就是 canvas.scale(1.0f, -1.0f)。很簡(jiǎn)單吧,沒(méi)想到給 scale() 函式一個(gè)負(fù)值,就可以翻轉(zhuǎn)相對(duì)應(yīng)的軸。
在 Photoshop 中,做鏡像特效的第二步是要對(duì)這翻轉(zhuǎn)的圖片,加個(gè)由灰到黑的漸層 mask。
在 Android 中,要畫漸層色,那就一定得用 LinearGradient 這個(gè)類別。至於要對(duì)背景圖加上個(gè) mask,就請(qǐng)參考一下 Paint 的 setXfermode() 函式。_Init() 這個(gè)函式,就是負(fù)責(zé)生成一個(gè)由灰到黑漸層 mask 的 m_paint 物件。
