Android位元影像相關解碼操作

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publicclass BitMapTools {

?

????/**

???? * 對圖片進行解碼操作

???? *

???? * @param resource

???? * 資源檔

???? * @param resId

???? * 解碼位元影像的iD

???? * @param reqWidt

???? * 指定輸出位元影像的寬度

???? * @param reqHight

???? * 制定輸出位元影像的高度

???? * @return

???? */

????publicstatic Bitmap decodeBitmap(Resources resource, int resId,

????????????int reqWidth, int reqHight) {

????????// 對位元影像進行解碼的參數設定

????????BitmapFactory.Options option = new BitmapFactory.Options();

????????// 在對位元影像進行解碼的過程中，避免申請記憶體

????????option.inJustDecodeBounds = true;

????????BitmapFactory.decodeResource(resource, resId, option);

????????//對圖片進行壓縮

????????option.inSampleSize = calculateInSimpleSize(option, reqWidth, reqHight);

????????option.inJustDecodeBounds = false;

????????return BitmapFactory.decodeResource(resource, resId, option);

????}

?

????/**

???? * 計算相關壓縮比例

???? * @param option

???? * @param reqWidth

???? * @param reqHight

???? * @return

???? */

????publicstaticint calculateInSimpleSize(BitmapFactory.Options option,

????????????int reqWidth, int reqHight) {

????????// 擷取圖片的原始寬高

????????int imageHight = option.outHeight;

????????int imageWidht = option.outWidth;

?

????????// 壓縮比例

????????int inSimpleSize = 1;

????????if (imageHight > reqHight || imageWidht > reqWidth) {

????????????finalint heightRatio = Math.round(1.0f * imageHight / reqHight);

????????????finalint widthRatio = Math.round(1.0f * imageWidht / reqWidth);

????????????inSimpleSize = heightRatio < widthRatio ? heightRatio : widthRatio;

????????}

????????return inSimpleSize;

????}

}

Android位元影像相關解碼操作