android bitmap的 一些简单操作

全都是一些代码片段，需要可以直接贴过去用

			/** 获取 drawable 的图片   可以循环   1.图名    2.drawable 3.包名      **/						int imgid = getResources().getIdentifier("ic_launcher", "drawable", "com.example.anywight");			text.setBackgroundResource(imgid);									/** 通过图片id获得Bitmap  **/			Bitmap bitmap=BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);									/** 通过 assest 获取       获得Drawable    bitmap **/			InputStream in = this.getAssets().open("ic_launcher");			Drawable da = Drawable.createFromStream(in, null);			Bitmap mm = BitmapFactory.decodeStream(in);							/** 通过 sdcard  获得   bitmap **/			Bitmap bit = BitmapFactory.decodeFile("/sdcard/android.jpg");				

	/** view转Bitmap **/	public static Bitmap convertViewToBitmap(View view, int bitmapWidth, int bitmapHeight){				Bitmap bitmap = Bitmap.createBitmap(bitmapWidth, bitmapHeight, Bitmap.Config.ARGB_8888);		view.draw(new Canvas(bitmap));		return bitmap;	}	/** 将控件转换为bitmap **/	public static Bitmap convertViewToBitMap(View view){		// 打开图像缓存		view.setDrawingCacheEnabled(true);		// 必须调用measure和layout方法才能成功保存可视组件的截图到png图像文件		// 测量View大小		view.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));		// 发送位置和尺寸到View及其所有的子View		view.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight());		// 获得可视组件的截图		Bitmap bitmap = view.getDrawingCache();		return bitmap;	}			public static Bitmap getBitmapFromView(View view){		Bitmap returnedBitmap = Bitmap.createBitmap(view.getWidth(), view.getHeight(), Bitmap.Config.ARGB_8888);		Canvas canvas = new Canvas(returnedBitmap);		Drawable bgDrawable = view.getBackground();		if (bgDrawable != null)			bgDrawable.draw(canvas);		else			canvas.drawColor(Color.WHITE);		view.draw(canvas);		return returnedBitmap;	}		/**  获取屏幕截图的bitmap对象的代码如下  **/	public Bitmap getScreenPic(View view){				View rootView = view.getRootView();		rootView.setDrawingCacheEnabled(true);		rootView.buildDrawingCache();		// 不明白为什么这里返回一个空，有帖子说不能在oncreat方法中调用		// 测量View大小		rootView.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));		// 发送位置和尺寸到View及其所有的子View		rootView.layout(0, 0, rootView.getMeasuredWidth(), rootView.getMeasuredHeight());		// 解决措施，调用上面的measure和layout方法之后，返回值就不再为空		// 如果想要创建的是固定长度和宽度的呢？		Bitmap bitmap = rootView.getDrawingCache();		rootView.destroyDrawingCache();		return bitmap;	}		/** Drawable → 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;	}			/** bitmap → drawable **/	public static Drawable bitmapToDrawable(Context context,String filename){				 Bitmap image = null;  	     BitmapDrawable ddd = null;  	        try {  	            AssetManager am = context.getAssets();  	            InputStream is = am.open(filename);  	            image = BitmapFactory.decodeStream(is);  	            ddd = new BitmapDrawable(context.getResources(), image);  	            is.close();  	        } catch (Exception e) {  	        }  	     return ddd;  	}			/** byte[] → Bitmap **/	public static Bitmap byteToDrawable(Context context,byte[] bb){	     Bitmap pp  = BitmapFactory.decodeByteArray(bb, 0, bb.length);	     return pp;	}			/**  Bitmap → byte[]**/	public static byte[] bitmapToByte(Bitmap bitmap){				ByteArrayOutputStream baos = new ByteArrayOutputStream();  		bitmap.compress(Bitmap.CompressFormat.PNG, 100, baos);  	    byte[] yy = baos.toByteArray();	    return yy;	}		/**  将text  转换成  bitmap  **/	public static Bitmap createTxtImage(String txt, int txtSize) {        Bitmap mbmpTest = Bitmap.createBitmap(txt.length() * txtSize + 4,                txtSize + 4, Config.ARGB_8888);        Canvas canvasTemp = new Canvas(mbmpTest);        Paint p = new Paint();        p.setAntiAlias(true);        p.setColor(Color.WHITE);        p.setTextSize(txtSize);        canvasTemp.drawText(txt, 2, txtSize - 2, p);        return mbmpTest;    }		/**  显示将bitmap进行缩放       **/	public Bitmap  bitmapScanel(Context context){		//通过openRawResource获取一个inputStream对象  	    InputStream inputStream = context.getResources().openRawResource(R.id.backageground);  	    //通过一个InputStream创建一个BitmapDrawable对象  	    BitmapDrawable drawable = new BitmapDrawable(inputStream);  	    //通过BitmapDrawable对象获得Bitmap对象  	    Bitmap bitmap = drawable.getBitmap();  	    //利用Bitmap对象创建缩略图  	    bitmap = ThumbnailUtils.extractThumbnail(bitmap, 40, 40);  	    return bitmap;   		 }		  /**  放大缩小图片    **/      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;      }  		        /** 获得圆角图片的方法  **/      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;      }          	/** 对 bitmap 进行裁剪     **/	public Bitmap  bitmapClip(Context context , int id , int x , int y){		 Bitmap map = BitmapFactory.decodeResource(context.getResources(), id);		 map = Bitmap.createBitmap(map, x, y, 120, 120);	     return map;	}			/**	 * 图片的倒影效果	 */	public static Bitmap createReflectedImage(Bitmap originalImage) {        final int reflectionGap = 4;        int width = originalImage.getWidth();        int height = originalImage.getHeight();        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 / 2), 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        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;     }