android bitmap的 一些簡單操作

全都是一些代碼片段，需要可以直接貼過去用

/** 獲取 drawable 的圖片   可以循環   1.圖名    2.drawable 3.包名      **/
    int imgid = getResources().getIdentifier(ic_launcher, drawable, com.example.anywight);
    text.setBackgroundResource(imgid);

/** 通過圖片id獲得Bitmap  **/
    Bitmap bitmap=BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);

/** view轉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;
}

/** 將控件轉換為bitmap **/
	public static Bitmap convertViewToBitMap(View view) {
		// 打開圖像緩存
		view.setDrawingCacheEnabled(true);
		// 必須調用measure和layout方法才能成功保存可視組件的截圖到png圖像文件
		// 測量View大小
		view.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED),
				MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
		// 發送位置和尺寸到View及其所有的子View
		view.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight());
		// 獲得可視組件的截圖
		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; }

/**  獲取屏幕截圖的bitmap對象的代碼如下  **/
	public Bitmap getScreenPic(View view){
	     
	    View rootView = view.getRootView();
	    rootView.setDrawingCacheEnabled(true);
	    rootView.buildDrawingCache();
	    // 不明白為什麼這裡返回一個空，有帖子說不能在oncreat方法中調用
	    // 測量View大小
	    rootView.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
	    // 發送位置和尺寸到View及其所有的子View
	    rootView.layout(0, 0, rootView.getMeasuredWidth(), rootView.getMeasuredHeight());
	    // 解決措施，調用上面的measure和layout方法之後，返回值就不再為空
	    // 如果想要創建的是固定長度和寬度的呢？
	    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;
	}
	 
	 
	/**  將text  轉換成  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;
	 
	}
	 
	/**  顯示將bitmap進行縮放       **/
	public Bitmap  bitmapScanel(Context context){
	    //通過openRawResource獲取一個inputStream對象  
	    InputStream inputStream = context.getResources().openRawResource(R.id.backageground);  
	    //通過一個InputStream創建一個BitmapDrawable對象  
	    BitmapDrawable drawable = new BitmapDrawable(inputStream);  
	    //通過BitmapDrawable對象獲得Bitmap對象  
	    Bitmap bitmap = drawable.getBitmap();  
	    //利用Bitmap對象創建縮略圖  
	    bitmap = ThumbnailUtils.extractThumbnail(bitmap, 40, 40);  
	    return bitmap;
	 
	 }
	 
	  /**  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;  
	}  
	 
	 
	 
	/** 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;  
	}  
	 
	 
	 
	/** 對 bitmap 進行裁剪     **/
	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;
	}
	 
	 
	 
	/**
	 * 圖片的倒影效果
	 */
	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;
	 }