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@wasabeef
Created February 3, 2014 14:53
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Android - ImageUtils
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Rect;
import android.media.ExifInterface;
import java.io.File;
import java.io.IOException;
/**
* 画像関連の共通メソッド
* @author D.furiya
*/
public class ImageUtils {
/**
* Bitmap画像を縦横サイズにリサイズ
* @param org 編集前のBitmap
* @param destWidth 指定横幅サイズ
* @param destHeight 指定縦幅サイズ
* @return Bitmap リサイズ画像
*/
public static Bitmap resizeBitmap(Bitmap org, int destWidth, int destHeight) {
// 空のbitmap、背景は全透明
Bitmap blankResized = Bitmap.createBitmap(destWidth, destHeight, Bitmap.Config.ARGB_8888);
// 縦縮か横縮尺か判定
int xPadding = 0;
int yPadding = 0;
int scaledWidth = blankResized.getWidth();
int scaledHeight = blankResized.getHeight();
float scale = 1;
if (org.getWidth() > org.getHeight()) {
// 縮尺とパディングの設定
scale = (float) blankResized.getWidth() / (float) org.getWidth();
scaledHeight = (int) (org.getHeight() * scale);
yPadding = (blankResized.getHeight() - scaledHeight) / 2;
}
else {
// 縮尺とパディングの設定
scale = (float) blankResized.getHeight() / (float) org.getHeight();
scaledWidth = (int) (org.getWidth() * scale);
xPadding = (blankResized.getWidth() - scaledWidth) / 2;
}
// 画像を縮小してコピーするときれいになる
Bitmap orgScale = Bitmap.createScaledBitmap(org, scaledWidth, scaledHeight, true);
Canvas canvas = new Canvas(blankResized);
canvas.drawBitmap(
orgScale,
new Rect(0, 0, scaledWidth, scaledHeight),
new Rect(xPadding, yPadding, xPadding + scaledWidth, yPadding + scaledHeight),
null);
return blankResized;
}
public static Bitmap rotateImage(final Bitmap bitmap, final File fileWithExifInfo) {
Bitmap rotatedBitmap = bitmap;
int orientation = 0;
try {
orientation = getImageOrientation(fileWithExifInfo.getAbsolutePath());
if (orientation != 0) {
final Matrix matrix = new Matrix();
matrix.postRotate(orientation);
rotatedBitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(),
bitmap.getHeight(), matrix, true);
bitmap.recycle();
}
} catch (final IOException e) {
}
return rotatedBitmap;
}
public static int getImageOrientation(final String file) throws IOException {
final ExifInterface exif = new ExifInterface(file);
final int orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, 1);
switch (orientation) {
case ExifInterface.ORIENTATION_NORMAL:
return 0;
case ExifInterface.ORIENTATION_ROTATE_90:
return 90;
case ExifInterface.ORIENTATION_ROTATE_180:
return 180;
case ExifInterface.ORIENTATION_ROTATE_270:
return 270;
default:
return 0;
}
}
public static int getOrientation(final int orientation) {
switch (orientation) {
case 0:
return ExifInterface.ORIENTATION_NORMAL;
case 90:
return ExifInterface.ORIENTATION_ROTATE_90;
case 180:
return ExifInterface.ORIENTATION_ROTATE_180;
case 270:
return ExifInterface.ORIENTATION_ROTATE_270;
default:
return 0;
}
}
}
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