react-navigation 3.x版本的安装以及react-native-gesture-handler配置

一、安装依赖，使用npm或yarn命令，3.x版本必须安装react-native-gesture-handler

react-navigation
react-native-gesture-handler

二、 配置react-native-gesture-handler，可以执行如下命令

react-native link react-native-gesture-handler

android执行此命令，有时候会没有效果，需要检查核实

• 查看android/settings.gradle
• 查看android/app/build.gradle
• 查看android/app/src/main/java/com/projectname/MainActivity.java和MainApplication.java

//settings.gradle
include ':react-native-gesture-handler'
project(':react-native-gesture-handler').projectDir = new File(rootProject.projectDir, '../node_modules/react-native-gesture-handler/android')

//app\build.gradle
implementation project(':react-native-gesture-handler')

//MainApplication.java

import com.swmansion.gesturehandler.react.RNGestureHandlerPackage;

public class MainApplication extends Application implements ReactApplication {

  private final ReactNativeHost mReactNativeHost = new ReactNativeHost(this) {
    ...

    @Override
    protected List<ReactPackage> getPackages() {
      return Arrays.<ReactPackage>asList(
          new MainReactPackage(),
          new RNGestureHandlerPackage()
      );
    }

    ...
  };

//MainActivity.java
import com.facebook.react.ReactActivityDelegate;
import com.facebook.react.ReactRootView;
import com.swmansion.gesturehandler.react.RNGestureHandlerEnabledRootView;

public class MainActivity extends ReactActivity {

  ...

  @Override
  protected ReactActivityDelegate createReactActivityDelegate() {
    return new ReactActivityDelegate(this, getMainComponentName()) {
      @Override
      protected ReactRootView createRootView() {
       return new RNGestureHandlerEnabledRootView(MainActivity.this);
      }
    };
  }
}

三、 undefined is not an object (evaluating 'RNGestureHandlerModule.State'）

　　以及 undefined is not an object (evaluating 'RNGestureHandlerModule.Direction'）

相关错误都是因为react-native-gesture-handler没有配置好