Android图片小结

图片缩放：

public static Drawable resizeImage(Drawable d, int w, int h) {

        // load the origial Bitmap

        Bitmap BitmapOrg = ((BitmapDrawable) d).getBitmap();

        int width = BitmapOrg.getWidth();

        int height = BitmapOrg.getHeight();

        int newWidth = w;

        int newHeight = h;

        // 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);

        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);

	}

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;



                // 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);



        }

 图片写字：

/**
	 * 图片上画字
	 * */
	private Bitmap drawTextAtBitmap(Bitmap bitmap,String text){
		
		int x = bitmap.getWidth();
		
		int y = bitmap.getHeight();
		
		// 创建一个和原图同样大小的位图
		Bitmap newbit = Bitmap.createBitmap(x, y, Bitmap.Config.ARGB_8888);
		
		Canvas canvas = new Canvas(newbit);
		
		Paint paint = new Paint();
		
		// 在原始位置0，0插入原图
		canvas.drawBitmap(bitmap, 0, 0, paint);
		
		paint.setColor(Color.parseColor("#dedbde"));
		
		paint.setTextSize(20);
		
		// 在原图指定位置写上字
		canvas.drawText(text, 53 , 30, paint);
		
		canvas.save(Canvas.ALL_SAVE_FLAG);
		
		// 存储
		canvas.restore();
		
		return newbit;
	}