android - Flutter 无法在设备导入 androidx.annotation.Nullable 上运行应用程序
问题描述
Initializing gradle...
Resolving dependencies...
Gradle task 'assembleDebug'...
registerResGeneratingTask is deprecated, use registerGeneratedResFolders(FileCollection)
registerResGeneratingTask is deprecated, use registerGeneratedResFolders(FileCollection)
registerResGeneratingTask is deprecated, use registerGeneratedResFolders(FileCollection)
registerResGeneratingTask is deprecated, use registerGeneratedResFolders(FileCollection)
registerResGeneratingTask is deprecated, use registerGeneratedResFolders(FileCollection)
/Users/ipatel/Documents/AAAA/FlutterSetup/flutter/.pub-cache/hosted/pub.dartlang.org/cloud_firestore-0.9.0/android/src/main/java/io/flutter/plugins/firebase/cloudfirestore/CloudFirestorePlugin.java:9: error: cannot find symbol
import androidx.annotation.NonNull;
^
symbol: class NonNull
location: package androidx.annotation
/Users/ipatel/Documents/AAAA/FlutterSetup/flutter/.pub-cache/hosted/pub.dartlang.org/cloud_firestore-0.9.0/android/src/main/java/io/flutter/plugins/firebase/cloudfirestore/CloudFirestorePlugin.java:10: error: cannot find symbol
import androidx.annotation.Nullable;
^
symbol: class Nullable
location: package androidx.annotation
/Users/ipatel/Documents/AAAA/FlutterSetup/flutter/.pub-cache/hosted/pub.dartlang.org/cloud_firestore-0.9.0/android/src/main/java/io/flutter/plugins/firebase/cloudfirestore/CloudFirestorePlugin.java:253: error: cannot find symbol
public void onFailure(@NonNull Exception e) {
^
symbol: class NonNull
/Users/ipatel/Documents/AAAA/FlutterSetup/flutter/.pub-cache/hosted/pub.dartlang.org/cloud_firestore-0.9.0/android/src/main/java/io/flutter/plugins/firebase/cloudfirestore/CloudFirestorePlugin.java:274: error: cannot find symbol
public Void apply(@NonNull Transaction transaction)
^
symbol: class NonNull
/Users/ipatel/Documents/AAAA/FlutterSetup/flutter/.pub-cache/hosted/pub.dartlang.org/cloud_firestore-0.9.0/android/src/main/java/io/flutter/plugins/firebase/cloudfirestore/CloudFirestorePlugin.java:272: error: cannot find symbol
@Nullable
^
symbol: class Nullable
/Users/ipatel/Documents/AAAA/FlutterSetup/flutter/.pub-cache/hosted/pub.dartlang.org/cloud_firestore-0.9.0/android/src/main/java/io/flutter/plugins/firebase/cloudfirestore/CloudFirestorePlugin.java:503: error: cannot find symbol
public void onFailure(@NonNull Exception e) {
^
symbol: class NonNull
/Users/ipatel/Documents/AAAA/FlutterSetup/flutter/.pub-cache/hosted/pub.dartlang.org/cloud_firestore-0.9.0/android/src/main/java/io/flutter/plugins/firebase/cloudfirestore/CloudFirestorePlugin.java:558: error: cannot find symbol
public void onFailure(@NonNull Exception e) {
^
symbol: class NonNull
7 errors
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':cloud_firestore: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 4s
Finished with error: Gradle task assembleDebug failed with exit code 1
不知道为什么会发现上述错误?我只是尝试在我的系统中连接设备并运行。
以前我尝试在没有安装 Android Studio 的情况下通过 VS Code 在设备上运行应用程序。所以我遵循了https://medium.com/@aubykhan/setting-up-flutter-without-android-studio-6f7abdeb353c这个教程并通过终端手动安装了 Gradle。
以下是我的终端的一些历史:
431 brew install gradle
432 brew cask install java
433 brew install gradle
434 flutter config --gradle-dir /usr/local/opt/gradle
435 flutter --version
436 clear
437 flutter doctor
438 sdkmanager "system-images;android-21;默认;x86_64"
439 vi ~/.bash_profile
440 打开 $HOME/.bash_profile
我认为问题可能是系统找到了 Gradle 的两条路径还是其他问题?不知道,但我该如何解决这个问题?
解决方案
在 android/gradle.properties 添加以下两行。就我而言,使用此解决问题。
android.useAndroidX=true
android.enableJetifier=true
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