使用image_picker_saver软件包从我的flutter应用程序下载图像时出现错误，当我从pubsec.yaml和saveImage小部件中删除image_picker_saver时，该应用程序运行良好，但是当我将image_picker_saver软件包添加到代码中时却出现错误。 / p>
运行控制台输出-
C:\flutter\.pub-cache\hosted\pub.dartlang.org\image_picker_saver-0.1.0\android\src\main\java\io\flutter\plugins\imagepickersaver\ImagePickerDelegate.java:15: error: package android.support.annotation does not exist
import android.support.annotation.VisibleForTesting;
^
C:\flutter\.pub-cache\hosted\pub.dartlang.org\image_picker_saver-0.1.0\android\src\main\java\io\flutter\plugins\imagepickersaver\ImagePickerDelegate.java:16: error: cannot find symbol
import android.support.v4.app.ActivityCompat;
^
symbol: class ActivityCompat
location: package android.support.v4.app
C:\flutter\.pub-cache\hosted\pub.dartlang.org\image_picker_saver-0.1.0\android\src\main\java\io\flutter\plugins\imagepickersaver\ImagePickerDelegate.java:17: error: package android.support.v4.content does not exist
import android.support.v4.content.FileProvider;
^
C:\flutter\.pub-cache\hosted\pub.dartlang.org\image_picker_saver-0.1.0\android\src\main\java\io\flutter\plugins\imagepickersaver\ImagePickerFileProvider.java:3: error: package android.support.v4.content does not exist
import android.support.v4.content.FileProvider;
^
C:\flutter\.pub-cache\hosted\pub.dartlang.org\image_picker_saver-0.1.0\android\src\main\java\io\flutter\plugins\imagepickersaver\ImagePickerFileProvider.java:10: error: cannot find symbol
public class ImagePickerFileProvider extends FileProvider {
^
symbol: class FileProvider
C:\flutter\.pub-cache\hosted\pub.dartlang.org\image_picker_saver-0.1.0\android\src\main\java\io\flutter\plugins\imagepickersaver\ImagePickerSaverPlugin.java:8: error: package android.support.annotation does not exist
import android.support.annotation.VisibleForTesting;
^
C:\flutter\.pub-cache\hosted\pub.dartlang.org\image_picker_saver-0.1.0\android\src\main\java\io\flutter\plugins\imagepickersaver\ImagePickerDelegate.java:70: error: cannot find symbol
@VisibleForTesting
^
symbol: class VisibleForTesting
location: class ImagePickerDelegate
C:\flutter\.pub-cache\hosted\pub.dartlang.org\image_picker_saver-0.1.0\android\src\main\java\io\flutter\plugins\imagepickersaver\ImagePickerDelegate.java:72: error: cannot find symbol
@VisibleForTesting
^
symbol: class VisibleForTesting
location: class ImagePickerDelegate
C:\flutter\.pub-cache\hosted\pub.dartlang.org\image_picker_saver-0.1.0\android\src\main\java\io\flutter\plugins\imagepickersaver\ImagePickerDelegate.java:74: error: cannot find symbol
@VisibleForTesting
^
symbol: class VisibleForTesting
location: class ImagePickerDelegate
C:\flutter\.pub-cache\hosted\pub.dartlang.org\image_picker_saver-0.1.0\android\src\main\java\io\flutter\plugins\imagepickersaver\ImagePickerDelegate.java:76: error: cannot find symbol
@VisibleForTesting
^
symbol: class VisibleForTesting
location: class ImagePickerDelegate
C:\flutter\.pub-cache\hosted\pub.dartlang.org\image_picker_saver-0.1.0\android\src\main\java\io\flutter\plugins\imagepickersaver\ImagePickerDelegate.java:78: error: cannot find symbol
@VisibleForTesting
^
symbol: class VisibleForTesting
location: class ImagePickerDelegate
C:\flutter\.pub-cache\hosted\pub.dartlang.org\image_picker_saver-0.1.0\android\src\main\java\io\flutter\plugins\imagepickersaver\ImagePickerDelegate.java:80: error: cannot find symbol
@VisibleForTesting
^
symbol: class VisibleForTesting
location: class ImagePickerDelegate
C:\flutter\.pub-cache\hosted\pub.dartlang.org\image_picker_saver-0.1.0\android\src\main\java\io\flutter\plugins\imagepickersaver\ImagePickerDelegate.java:82: error: cannot find symbol
@VisibleForTesting
^
symbol: class VisibleForTesting
location: class ImagePickerDelegate
C:\flutter\.pub-cache\hosted\pub.dartlang.org\image_picker_saver-0.1.0\android\src\main\java\io\flutter\plugins\imagepickersaver\ImagePickerDelegate.java:84: error: cannot find symbol
@VisibleForTesting
^
symbol: class VisibleForTesting
location: class ImagePickerDelegate
C:\flutter\.pub-cache\hosted\pub.dartlang.org\image_picker_saver-0.1.0\android\src\main\java\io\flutter\plugins\imagepickersaver\ImagePickerDelegate.java:87: error: cannot find symbol
@VisibleForTesting
^
symbol: class VisibleForTesting
location: class ImagePickerDelegate
C:\flutter\.pub-cache\hosted\pub.dartlang.org\image_picker_saver-0.1.0\android\src\main\java\io\flutter\plugins\imagepickersaver\ImagePickerDelegate.java:176: error: cannot find symbol
@VisibleForTesting
^
symbol: class VisibleForTesting
location: class ImagePickerDelegate
C:\flutter\.pub-cache\hosted\pub.dartlang.org\image_picker_saver-0.1.0\android\src\main\java\io\flutter\plugins\imagepickersaver\ImagePickerSaverPlugin.java:44: error: cannot find symbol
@VisibleForTesting
^
symbol: class VisibleForTesting
location: class ImagePickerSaverPlugin
C:\flutter\.pub-cache\hosted\pub.dartlang.org\image_picker_saver-0.1.0\android\src\main\java\io\flutter\plugins\imagepickersaver\ImagePickerDelegate.java:133: error: cannot find symbol
return ActivityCompat.checkSelfPermission(activity, permissionName)
^
symbol: variable ActivityCompat
C:\flutter\.pub-cache\hosted\pub.dartlang.org\image_picker_saver-0.1.0\android\src\main\java\io\flutter\plugins\imagepickersaver\ImagePickerDelegate.java:139: error: cannot find symbol
ActivityCompat.requestPermissions(activity, new String[]{permissionName}, requestCode);
^
symbol: variable ActivityCompat
C:\flutter\.pub-cache\hosted\pub.dartlang.org\image_picker_saver-0.1.0\android\src\main\java\io\flutter\plugins\imagepickersaver\ImagePickerDelegate.java:151: error: cannot find symbol
return FileProvider.getUriForFile(activity, fileProviderName, file);
^
symbol: variable FileProvider
20 errors
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':image_picker_saver:compileDebugJavaWithJavac'.
> Compilation failed; see the compiler error output for details.
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
* Get more help at https://help.gradle.org
BUILD FAILED in 2m 27s
*******************************************************************************************
The Gradle failure may have been because of AndroidX incompatibilities in this Flutter app.
*******************************************************************************************
Finished with error: Gradle task assembleDebug failed with exit code 1
部分代码-
class FullScreenImagePage extends StatelessWidget {
String imgPath;
FullScreenImagePage(this.imgPath);
@override
Widget build(BuildContext context) {
return Scaffold(
body: new SizedBox.expand(
child: new Container(
decoration: new BoxDecoration(gradient: backgroundGradient),
child: new Stack(
children: <Widget>[
new Align(
alignment: Alignment.center,
child: new Hero(
tag: imgPath,
child: new Image.network(imgPath),
),
),
new Align(
alignment: Alignment.topCenter,
child: new Column(
mainAxisAlignment: MainAxisAlignment.start,
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Align(alignment: Alignment.bottomCenter,
child: IconButton(
icon: Icon(Icons.file_download,
color: Colors.black),
onPressed: () =>
_saveImage(imgPath)
),
),
_saveImage(imageNames) async {
await PermissionHandler()
.checkPermissionStatus(PermissionGroup.storage)
.then((status) async {
if (status == PermissionStatus.denied ||
status == PermissionStatus.disabled ||
status == PermissionStatus.unknown) {
await PermissionHandler().requestPermissions(
[PermissionGroup.storage]).then((status1) async {
if (status1.containsValue(PermissionStatus.granted)) {
await get(imageNames).then((res) async {
await ImagePickerSaver.saveFile(fileData: res.bodyBytes)
.then((str) {
File.fromUri(Uri.file(str));
Fluttertoast.showToast(
msg: "Saved to gallery!",
toastLength: Toast.LENGTH_LONG,
gravity: ToastGravity.BOTTOM,
timeInSecForIos: 1,
backgroundColor: Colors.green,
textColor: Colors.white,
fontSize: 15.0);
});
});
}
});
} else if (status == PermissionStatus.granted) {
await get(imageNames).then((res) async {
await ImagePickerSaver.saveFile(fileData: res.bodyBytes).then((str) {
File.fromUri(Uri.file(str));
Fluttertoast.showToast(
msg: "Saved to gallery!",
toastLength: Toast.LENGTH_LONG,
gravity: ToastGravity.CENTER,
timeInSecForIos: 1,
backgroundColor: Colors.green,
textColor: Colors.white,
fontSize: 15.0);
});
});
}
});
}
in pubsec.yaml-
image_picker_saver: ^0.1.0