Android 从图库应用程序中选择图像
我使用此代码允许用户从gallery应用程序中选择图像,然后再获取该图像Android 从图库应用程序中选择图像,android,android-intent,Android,Android Intent,我使用此代码允许用户从gallery应用程序中选择图像,然后再获取该图像 @Override public void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); if (resultCode == getActivity().RESULT_OK) {
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == getActivity().RESULT_OK) {
if (requestCode == REQUEST_CAMERA) {
Bitmap photo = (Bitmap) data.getExtras().get("data");
mImg.setImageBitmap(photo);
} else if (requestCode == SELECT_FILE) {
Uri selectedImageUri = data.getData();
String[] projection = {MediaStore.MediaColumns.DATA};
CursorLoader cursorLoader = new CursorLoader(getActivity(), selectedImageUri, projection, null, null,
null);
Cursor cursor = cursorLoader.loadInBackground();
int column_index = cursor.getColumnIndexOrThrow(MediaStore.MediaColumns.DATA);
cursor.moveToFirst();
String selectedImagePath = cursor.getString(column_index);
Bitmap bm;
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(selectedImagePath, options);
final int REQUIRED_SIZE = 200;
int scale = 1;
while (options.outWidth / scale / 2 >= REQUIRED_SIZE
&& options.outHeight / scale / 2 >= REQUIRED_SIZE)
scale *= 2;
options.inSampleSize = scale;
options.inJustDecodeBounds = false;
bm = BitmapFactory.decodeFile(selectedImagePath, options);
mImg.setImageBitmap(bm);
mImg.setAlpha(1);
}
}
}
但是在这个回答中,我被告知这个代码在大多数android设备上都不起作用。我能知道为什么吗?获得用户选择的图像的最佳方式是什么
我在一个单独的问题中发布了这篇文章,因为它可能很有趣。通过使用位图,您的图像可能看起来很模糊。如果图像大小过大,则在您希望将其上载或检索到(从)服务器时会出现问题。所以
uri
比bitmap
好
您可以尝试下面的代码,您将看到bitmap
和uri
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
switch (requestCode) {
case RESULT_LOAD_IMAGE:
if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK & null != data) {
selectedImage = data.getData();
imageView.setImageURI(selectedImage);
}
else
{
imageView.setImageResource(R.mipmap.no_image);
}
break;
case REQUEST_IMAGE_CAPTURE:
if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
try {
selectedImage = imageUri;
getContentResolver().notifyChange(selectedImage, null);
imageView.setImageURI(null);
imageView.setImageURI(imageUri);
} catch (Exception e) {
Toast.makeText(this, "Failed to load", Toast.LENGTH_SHORT)
.show();
Log.e("Camera", e.toString());
}
Log.e("A", "AAA");
}
}
}
使用
uri
而不是bitmap
。使用上述代码时,您的图像看起来模糊吗?可能是重复的,谢谢。此行是否表示imageUri selectedImageUri=data.getData();代码在某些设备上显示“加载失败”Toast,可能是什么问题?在哪里添加Toast?