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我已经构建了一个用户可以拍照的自定义相机活动。图片通过图片回调保存在外部存储目录中。用户然后被重定向到可以预览图片的另一个活动。在显示预览之前,图片会在单独的线程中缩小到某个最大尺寸。下面是缩放代码:Android Desire HD位图缩放
byte[] tempStorage = new byte[16 * 1024];
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(imagePath, options);
int oldWidth = options.outWidth;
int oldHeight = options.outHeight;
if (oldWidth > MAX_DIM || oldHeight > MAX_DIM) {
Logger.i(Constants.SCALE_TAG, "Must scale picture");
int scaleFactor = getScaleFactor(oldWidth, oldHeight);
options.inJustDecodeBounds = false;
options.inSampleSize = scaleFactor;
options.inTempStorage = tempStorage;
System.gc();
newB = BitmapFactory.decodeFile(imagePath, options);
} else {
Logger.i(Constants.SCALE_TAG, "No need for scaling");
// We do not need to scale the picture, it is small
// enough.
System.gc();
options.inJustDecodeBounds = false;
options.inTempStorage = tempStorage;
if (!stop) {
newB = BitmapFactory.decodeFile(imagePath, options);
} else {
return;
}
}
这里是计算比例因子代码:
private int getScaleFactor(int oldWidth, int oldHeight) {
// Holds the raw scale factor.
float rawScale;
// Get the scaling factor.
if (oldWidth >= oldHeight) {
rawScale = 1.0F/((MAX_DIM * 1.0F)/(oldWidth * 1.0F));
} else {
rawScale = 1.0F/((MAX_DIM * 1.0F)/(oldHeight * 1.0F));
}
Logger.i(Constants.SCALE_TAG, "Raw scale factor: " + rawScale);
return Math.round(rawScale);
}
此代码工作正常上大多数设备,但不知何故的Desire HD将无法正确缩放图片。它看起来像是拍摄了原始图片并将其复制了30次左右,并将其缩放到位图中,导致出现了奇怪的条纹状图片。有谁知道这个问题?