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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 **/ i...

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;
     }