Android 选项outHeight和outWidth对于大型图像返回-1
我正在尝试调整大图像的大小。对于小图像,此代码可以正常工作,但是对于大图像,outHeight和outWidth始终为-1,这会创建NullPointerException。这特别奇怪,因为我设置了options.inJustDecodeBounds=true,这应该可以防止这种错误,因为内存使用减少了。我错过什么了吗?我的方法如下:Android 选项outHeight和outWidth对于大型图像返回-1,android,bitmap,Android,Bitmap,我正在尝试调整大图像的大小。对于小图像,此代码可以正常工作,但是对于大图像,outHeight和outWidth始终为-1,这会创建NullPointerException。这特别奇怪,因为我设置了options.inJustDecodeBounds=true,这应该可以防止这种错误,因为内存使用减少了。我错过什么了吗?我的方法如下: @Override protected void onActivityResult(int requestCode, int resultCode,
@Override
protected void onActivityResult(int requestCode, int resultCode,
Intent imageReturnedIntent) {
super.onActivityResult(requestCode, resultCode, imageReturnedIntent);
if (requestCode == REQUEST_CODE && resultCode == RESULT_OK) {
Uri selectedImage = imageReturnedIntent.getData();
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
InputStream inputStream = null;
try {
inputStream = getContentResolver().openInputStream(
selectedImage);
} catch (FileNotFoundException e1) {
Log.d("onActivityResult", "FileNotFoundException");
e1.printStackTrace();
}
BitmapFactory.decodeStream(inputStream, null, options);
try {
inputStream.close();
} catch (IOException e1) {
Log.d("onActivityResult", "IOException");
e1.printStackTrace();
}
options.inJustDecodeBounds = false;
options.inSampleSize = calculateInSampleSize(options, IMAGE_SIZE,
IMAGE_SIZE);
InputStream inputStreamTwo = null;
try {
inputStreamTwo = getContentResolver().openInputStream(
selectedImage);
} catch (FileNotFoundException e) {
Log.d("onActivityResult", "FileNotFoundException");
e.printStackTrace();
}
Bitmap unscaledImage = BitmapFactory.decodeStream(inputStreamTwo,
null, options);
image = Bitmap.createScaledBitmap(unscaledImage, IMAGE_SIZE,
IMAGE_SIZE, false);
Log.d("Unscaled image byte count",
"Bytes: " + unscaledImage.getByteCount());
Log.d("Scaled image byte count", "Bytes: " + image.getByteCount());
}
}
public static int calculateInSampleSize(BitmapFactory.Options options,
int reqWidth, int reqHeight) {
// Raw height and width of image
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
// Calculate ratios of height and width to requested height and width
final int heightRatio = Math.round((float) height
/ (float) reqHeight);
final int widthRatio = Math.round((float) width / (float) reqWidth);
// Choose the smallest ratio as inSampleSize value, this will guarantee
// a final image with both dimensions larger than or equal to the
// requested height and width.
inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
}
return inSampleSize;
}
@覆盖
ActivityResult上受保护的void(int请求代码、int结果代码、,
意图(返回内容){
super.onActivityResult(请求代码、结果代码、图像返回内容);
if(requestCode==REQUEST\u CODE&&resultCode==RESULT\u OK){
Uri selectedImage=imageReturnedIntent.getData();
BitmapFactory.Options=new-BitmapFactory.Options();
options.inJustDecodeBounds=true;
InputStream InputStream=null;
试一试{
inputStream=getContentResolver().openInputStream(
选择图像);
}捕获(FileNotFoundException e1){
Log.d(“onActivityResult”、“FileNotFoundException”);
e1.printStackTrace();
}
解码流(inputStream,null,选项);
试一试{
inputStream.close();
}捕获(IOE1异常){
Log.d(“onActivityResult”、“IOException”);
e1.printStackTrace();
}
options.inJustDecodeBounds=false;
options.inSampleSize=计算样本大小(选项、图像大小、,
图像大小);
InputStream inputStreamTwo=null;
试一试{
inputStreamTwo=getContentResolver().openInputStream(
选择图像);
}catch(filenotfounde异常){
Log.d(“onActivityResult”、“FileNotFoundException”);
e、 printStackTrace();
}
位图unscaledImage=BitmapFactory.decodeStream(InputStream2,
空,选项);
image=Bitmap.createScaledBitmap(未缩放图像、图像大小、,
图像大小,错误);
Log.d(“未缩放图像字节计数”,
字节数:“+unscaledImage.getByteCount());
Log.d(“缩放图像字节数”,“字节数:”+image.getByteCount());
}
}
公共静态int-calculateInSampleSize(BitmapFactory.Options、,
输入要求宽度,输入要求高度){
//图像的原始高度和宽度
最终内部高度=options.outHeight;
最终整数宽度=options.outWidth;
int inSampleSize=1;
如果(高度>要求高度| |宽度>要求宽度){
//计算高度和宽度与所需高度和宽度的比率
最终整数高度比=数学圆((浮动)高度
/(浮动)高度);
最终整数宽度比=数学圆((浮动)宽度/(浮动)宽度);
//选择最小比率作为采样值,这将保证
//最终图像的两个尺寸均大于或等于
//要求的高度和宽度。
inSampleSize=高度比<宽度比?高度比:宽度比;
}
返回样本大小;
}
谢谢你的帮助
更新:这也发生在小图像上(大约100KB),它们是JPG。手机摄像头拍摄的更大的JPG(1.2MB)不会出现这种情况。问题是图像来自Picasa,因此它们没有存储在SD上,从而产生了NullPointerException。您可以在启动活动之前设置intent.putExtra(intent.EXTRA\u LOCAL\u ONLY,true),将库中的项目仅限于SD卡上的项目。如果我找到一个更好的解决方案,我会发布