bitmap

BitmapUtil.java

// 按分辨率压缩
public Bitmap compressBitmap(Bitmap tmpBitmap) {
    int w = tmpBitmap.getWidth() ;
    int h = tmpBitmap.getHeight() ;
    Matrix matrix = new Matrix();
    float scaleWidth = 800f / w;
    float scaleHeight = 600f / h;
    matrix.postScale(scaleWidth , scaleHeight);
    Bitmap endBitmap = Bitmap. createBitmap( tmpBitmap, 0 , 0 , tmpBitmap.getWidth() , tmpBitmap.getHeight() , matrix, true ) ;
    return endBitmap ;
}

// 调整bitmap格式为RGB_565, 并进行质量压缩
public static Bitmap addInBitmapOptions(Bitmap srcBitmap, Bitmap bmp) {
    LogUtil.d(TAG, "original Bitmap:" + bmp.getByteCount());
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    baos.reset();
    int beginRate = 100;
    bmp.compress(Bitmap.CompressFormat.JPEG, beginRate, baos);
    LogUtil.d(TAG, "file length: " + baos.toByteArray().length);
    while (baos.toByteArray().length / 1024 > 50) {
        baos.reset();
        beginRate -= 10;
        bmp.compress(Bitmap.CompressFormat.JPEG, beginRate, baos);
        if (beginRate == 60) {
            break;
        }
    }
    LogUtil.d(TAG, "compressed file length: " + baos.toByteArray().length);
    ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
    BitmapFactory.Options options = new BitmapFactory.Options();
    options.inMutable = true;
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
        options.inBitmap = srcBitmap;
    }
    options.inPreferredConfig = Config.RGB_565;
    options.inPurgeable = true;
    options.inInputShareable = true;
    options.inJustDecodeBounds = false;
    Bitmap endBitmap = BitmapFactory.decodeStream(bais, null, options);
    LogUtil.d(TAG, "processed Bitmap: " + endBitmap.getByteCount());
    return endBitmap;
}

public void saveBitmap(Bitmap bitmap) {
    // 首先保存图片
    File appDir = new File(Environment.getExternalStorageDirectory(), "asave_image");
    if (!appDir.exists()) {
        appDir.mkdirs();
    }
    String fileName = "temp_image" + System.currentTimeMillis() + ".png";
    File file = new File(appDir, fileName);
    try {
        FileOutputStream fos = new FileOutputStream(file);
        bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);
        fos.flush();
        fos.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

private Bitmap byte2bitmap(byte[] bytes, int width, int height) {
    Bitmap bitmap = null;
    final int w = width; // 宽度
    final int h = height;
    final YuvImage image = new YuvImage(bytes, ImageFormat.NV21, w, h, null);
    ByteArrayOutputStream os = new ByteArrayOutputStream(bytes.length);
    if (!image.compressToJpeg(new Rect(0, 0, w, h), 100, os)) {
        return null;
    }
    byte[] tmp = os.toByteArray();
    bitmap = BitmapFactory.decodeByteArray(tmp, 0, tmp.length);


    Matrix matrix = new Matrix();
    matrix.setRotate(0);
    bitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
    return bitmap;
}