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图像转换
@Override public void onClick(View v) { // if (mBitmap == null) { // mBitmap = Bitmap.createBitmap(mCharView.getMeasuredWidth(), mCharView.getMeasuredHeight(), Bitmap.Config.ARGB_8888); // } // for (int i = 33; i < 127; i++) { // char c = (char)i; // mCharView.setChar(c); // mCharView.drawBitmap(mBitmap); // int averGray = (int)(calAverageGray(mBitmap) * 100000); // results.put(averGray, c); // } // // List<Integer> floats = new ArrayList<Integer>(); // floats.addAll(results.keySet()); // Collections.sort(floats); // StringBuilder sb = new StringBuilder(); // for (Integer f : floats) { // Log.d("Result", results.get(f)+" : "+f); // sb.append(String.valueOf((int)results.get(f))).append(","); // } // Log.d("Result", "result = "+sb.toString()); String[] dics = dic.split(","); int dicCount = dics.length; File file = new File(Environment.getExternalStorageDirectory(), "test.jpg"); Bitmap bitmap = BitmapFactory.decodeFile(file.getAbsolutePath()); int width = bitmap.getWidth(); int height = bitmap.getHeight(); Bitmap dest = Bitmap.createBitmap(width * 2, height * 2, Bitmap.Config.ARGB_8888); Canvas canvas = new Canvas(dest); Paint paint = new Paint(); paint.setTextSize(8); float textsize = paint.measureText("W"); float textHeight = paint.descent() - paint.ascent(); float textPosY = - paint.ascent(); float textPosX = - 0; // int dimen = 4; // int dimenY = (int)(dimen * 2.23f); int dimen = (int)textsize / 2; int dimenY = (int)textHeight / 2; StringBuilder sb = new StringBuilder(); for (int i = 0; i < height; i+= dimenY) { for (int j = 0; j < width; j+= dimen) { int w = dimen > width - j ? width - j : dimen; int h = dimenY > height - i ? height - i : dimenY; Bitmap temp = Bitmap.createBitmap(bitmap, j, i, w, h); float averGray = calAverageGray(temp); temp.recycle(); int threshold = 180; if (averGray < threshold) { int pos = (int)((threshold - averGray) / (float)threshold * dicCount); pos = pos > dicCount - 1 ? dicCount - 1 : pos; int charInt = Integer.decode(dics[pos]); sb.append((char)charInt); canvas.drawText(String.valueOf((char)charInt), textPosX, textPosY, paint); } else { sb.append(‘ ‘); } textPosX += textsize; } textPosY += textHeight; textPosX = 0; sb.append("\n"); } saveBitmapToFile(dest, Environment.getExternalStorageDirectory().getAbsolutePath(), "dest.png", true, false); Log.e("HA", sb.toString()); ((TextView)findViewById(R.id.mytext)).setText(sb.toString()); File file2 = new File(Environment.getExternalStorageDirectory(), "test.txt"); BufferedWriter bw = null; try { bw = new BufferedWriter(new FileWriter(file2)); bw.write(sb.toString()); bw.flush(); } catch (IOException e) { } finally { if (bw != null) { try {bw.close();}catch(Exception e){}; } } } private float calAverageGray(Bitmap b) { int width = b.getWidth(); int height = b.getHeight(); float grayCount = 0; for(int i = 0; i < height; i++) { for (int j = 0; j < width; j++) { int color = b.getPixel(j, i); int r = Color.red(color); int g = Color.green(color); int bl = Color.blue(color); grayCount +=(r * 19595 + g * 38469 + bl * 7472) >> 16; } } return grayCount / (width * height); } /** * 保存bitmap到文件中,由于不知道当前bitmap的格式,可能导致保存后文件变大或变小,慎重使用 * @param bitmap * @param path * @param name * @param isHighDefinition png或jpg存储 * @param recycleSelf 是否释放该位图 */ public static void saveBitmapToFile(Bitmap bitmap, String path, String name, boolean isHighDefinition, boolean recycleSelf) { File file = new File(path); if (!file.exists()) { file.mkdirs(); } File imageFile = new File(file, name); // 如果文件已经存在,则不继续保存 if (imageFile.exists()) { return; } FileOutputStream fos = null; try { imageFile.createNewFile(); fos = new FileOutputStream(imageFile); // TODO 后续可以根据分辨率来保存不同图片质量 if (isHighDefinition) { bitmap.compress(CompressFormat.PNG, 100, fos); } else { bitmap.compress(CompressFormat.JPEG, 50, fos); } } catch (FileNotFoundException e) { } catch (IOException e) { } finally { if (fos != null) { try { fos.flush(); } catch (IOException e) { } try { fos.close(); } catch (IOException e) { } } } } private Map<Integer, Character> results = new HashMap<Integer, Character>(); private Bitmap mBitmap; private String dic = "46,96,39,58,45,44,59,34,95,126,33,94,105,114,124,47,73,61,60,62,42,108,92,49,116,43,106,63,118,41,40,76,102,123,55,125,74,84,99,120,122,93,91,117,110,115,89,111,70,121,101,50,97,86,107,51,104,90,67,52,80,53,65,113,88,112,69,37,48,85,100,98,54,75,83,57,35,72,119,71,36,79,103,68,56,82,81,109,66,38,78,87,77,64";
图像转换
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