当我运行react-native run-android时，出现以下错误；我正在将其设置为在设备上运行。
:app:compileDebugJava
/Users/hello/MediaFire/apps/test2/android/app/src/main/java/com/test2/MainApplication.java:6: error: cannot find symbol
import com.facebook.react.ReactApplication;
^
symbol: class ReactApplication
location: package com.facebook.react
/Users/hello/MediaFire/apps/test2/android/app/src/main/java/com/test2/MainApplication.java:8: error: cannot find symbol
import com.facebook.react.ReactNativeHost;
^
symbol: class ReactNativeHost
location: package com.facebook.react
/Users/hello/MediaFire/apps/test2/android/app/src/main/java/com/test2/MainApplication.java:15: error: cannot find symbol
public class MainApplication extends Application implements ReactApplication {
^
symbol: class ReactApplication
/Users/hello/MediaFire/apps/test2/android/app/src/main/java/com/test2/MainApplication.java:17: error: cannot find symbol
private final ReactNativeHost mReactNativeHost = new ReactNativeHost(this) {
^
symbol: class ReactNativeHost
location: class MainApplication
/Users/hello/MediaFire/apps/v/android/app/src/main/java/com/test2/MainApplication.java:32: error: cannot find symbol
public ReactNativeHost getReactNativeHost() {
^
symbol: class ReactNativeHost
location: class MainApplication
/Users/hello/MediaFire/apps/test2/android/app/src/main/java/com/test2/MainActivity.java:6: error: MainActivity is not abstract and does not override abstract method getPackages() in ReactActivity
public class MainActivity extends ReactActivity {
^
/Users/hello/MediaFire/apps/test2/android/app/src/main/java/com/test2/MainApplication.java:17: error: cannot find symbol
private final ReactNativeHost mReactNativeHost = new ReactNativeHost(this) {
^
symbol: class ReactNativeHost
location: class MainApplication
/Users/hello/MediaFire/apps/test2/android/app/src/main/java/com/test2/MainApplication.java:31: error: method does not override or implement a method from a supertype
@Override
^
8 errors
:app:compileDebugJava FAILED
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':app:compileDebugJava'.
> 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.
BUILD FAILED
Total time: 10.738 secs
Could not install the app on the device, read the error above for details.
Make sure you have an Android emulator running or a device connected and have
set up your Android development environment:
https://facebook.github.io/react-native/docs/android-setup.html
我解决了这个问题react-native upgrade
参考：Overload119 的回答 https://stackoverflow.com/questions/34995079/react-native-android-build-error-mainactivity-java29-error-cannot-find-symbol
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