添加BitmapUtils

app/src/main/java/com/gh/common/util/BitmapUtils.java

@@ -0,0 +1,87 @@
+package com.gh.common.util;
+
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.graphics.Matrix;
+import android.media.ExifInterface;
+
+import java.io.IOException;
+
+/**
+ * Created by LGT on 2016/10/21.
+ */
+public class BitmapUtils {
+
+	/**
+	 * 根据文件路径返回bitmap
+	 * @param filepath 文件路径
+	 * @param w 宽
+	 * @param h 高
+	 * @return bitmap
+	 */
+	public static Bitmap getBitmapByFile(String filepath, int w, int h) {
+		try {
+			BitmapFactory.Options options = new BitmapFactory.Options();
+			// 设置为ture只获取图片大小
+			options.inJustDecodeBounds = true;
+			options.inPreferredConfig = Bitmap.Config.RGB_565;
+			// 返回为空
+			BitmapFactory.decodeFile(filepath, options);
+			int width = options.outWidth;
+			int height = options.outHeight;
+			float scaleWidth = 0.f, scaleHeight = 0.f;
+			if (width > w || height > h) {
+				// 缩放
+				scaleWidth = ((float) width) / w;
+				scaleHeight = ((float) height) / h;
+			}
+			options.inJustDecodeBounds = false;
+			int scale = (int) Math.ceil(Math.max(scaleWidth, scaleHeight));
+			if (scale % 2 == 1) {
+				scale += 1;
+			}
+			options.inSampleSize = scale;
+			Bitmap bitmap = BitmapFactory.decodeFile(filepath, options);
+			bitmap = rotatePicture(filepath, bitmap);
+			if (bitmap != null) {
+				return bitmap;
+			}
+			return null;
+		} catch (Exception e) {
+			e.printStackTrace();
+			return null;
+		}
+	}
+
+	public static Bitmap rotatePicture(String path, Bitmap bitmap) {
+		int rotate = 0;
+		try {
+			ExifInterface exifInterface = new ExifInterface(path);
+			int orientation = exifInterface.getAttributeInt(
+					ExifInterface.TAG_ORIENTATION,
+					ExifInterface.ORIENTATION_NORMAL);
+			switch (orientation) {
+				case ExifInterface.ORIENTATION_ROTATE_90:
+					rotate = 90;
+					break;
+				case ExifInterface.ORIENTATION_ROTATE_180:
+					rotate = 180;
+					break;
+				case ExifInterface.ORIENTATION_ROTATE_270:
+					rotate = 270;
+					break;
+			}
+		} catch (IOException e) {
+			e.printStackTrace();
+		}
+		if (rotate != 0) {
+			Matrix matrix = new Matrix();
+			matrix.setRotate(rotate);
+			return Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(),
+					bitmap.getHeight(), matrix, true);
+		} else {
+			return bitmap;
+		}
+	}
+
+}