react-native/ReactAndroid/src/main/java/com/facebook/react/ReactFragment.java

/**
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * <p>This source code is licensed under the MIT license found in the LICENSE file in the root
 * directory of this source tree.
 */
package com.facebook.react;

import android.annotation.TargetApi;
import android.app.Activity;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import com.facebook.react.modules.core.PermissionAwareActivity;
import com.facebook.react.modules.core.PermissionListener;

/**
 * Fragment for creating a React View. This allows the developer to "embed" a React Application
 * inside native components such as a Drawer, ViewPager, etc.
 */
public class ReactFragment extends Fragment implements PermissionAwareActivity {

  private static final String ARG_COMPONENT_NAME = "arg_component_name";
  private static final String ARG_LAUNCH_OPTIONS = "arg_launch_options";

  private ReactDelegate mReactDelegate;

  @Nullable private PermissionListener mPermissionListener;

  public ReactFragment() {
    // Required empty public constructor
  }

  /**
   * @param componentName The name of the react native component
   * @return A new instance of fragment ReactFragment.
   */
  private static ReactFragment newInstance(String componentName, Bundle launchOptions) {
    ReactFragment fragment = new ReactFragment();
    Bundle args = new Bundle();
    args.putString(ARG_COMPONENT_NAME, componentName);
    args.putBundle(ARG_LAUNCH_OPTIONS, launchOptions);
    fragment.setArguments(args);
    return fragment;
  }

  // region Lifecycle
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    String mainComponentName = null;
    Bundle launchOptions = null;
    if (getArguments() != null) {
      mainComponentName = getArguments().getString(ARG_COMPONENT_NAME);
      launchOptions = getArguments().getBundle(ARG_LAUNCH_OPTIONS);
    }
    if (mainComponentName == null) {
      throw new IllegalStateException("Cannot loadApp if component name is null");
    }
    mReactDelegate =
        new ReactDelegate(getActivity(), getReactNativeHost(), mainComponentName, launchOptions);
  }

  /**
   * Get the {@link ReactNativeHost} used by this app. By default, assumes {@link
   * Activity#getApplication()} is an instance of {@link ReactApplication} and calls {@link
   * ReactApplication#getReactNativeHost()}. Override this method if your application class does not
   * implement {@code ReactApplication} or you simply have a different mechanism for storing a
   * {@code ReactNativeHost}, e.g. as a static field somewhere.
   */
  protected ReactNativeHost getReactNativeHost() {
    return ((ReactApplication) getActivity().getApplication()).getReactNativeHost();
  }

  @Override
  public View onCreateView(
      LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    mReactDelegate.loadApp();
    return mReactDelegate.getReactRootView();
  }

  @Override
  public void onResume() {
    super.onResume();
    mReactDelegate.onHostResume();
  }

  @Override
  public void onPause() {
    super.onPause();
    mReactDelegate.onHostPause();
  }

  @Override
  public void onDestroy() {
    super.onDestroy();
    mReactDelegate.onHostDestroy();
  }
  // endregion

  @Override
  public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    mReactDelegate.onActivityResult(requestCode, resultCode, data, false);
  }

  /**
   * Helper to forward hardware back presses to our React Native Host
   *
   * <p>This must be called via a forward from your host Activity
   */
  public boolean onBackPressed() {
    return mReactDelegate.onBackPressed();
  }

  /**
   * Helper to forward onKeyUp commands from our host Activity. This allows ReactFragment to handle
   * double tap reloads and dev menus
   *
   * <p>This must be called via a forward from your host Activity
   *
   * @param keyCode keyCode
   * @param event event
   * @return true if we handled onKeyUp
   */
  public boolean onKeyUp(int keyCode, KeyEvent event) {
    return mReactDelegate.shouldShowDevMenuOrReload(keyCode, event);
  }

  @Override
  public void onRequestPermissionsResult(
      int requestCode, String[] permissions, int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    if (mPermissionListener != null
        && mPermissionListener.onRequestPermissionsResult(requestCode, permissions, grantResults)) {
      mPermissionListener = null;
    }
  }

  @Override
  public int checkPermission(String permission, int pid, int uid) {
    return getActivity().checkPermission(permission, pid, uid);
  }

  @TargetApi(Build.VERSION_CODES.M)
  @Override
  public int checkSelfPermission(String permission) {
    return getActivity().checkSelfPermission(permission);
  }

  @TargetApi(Build.VERSION_CODES.M)
  @Override
  public void requestPermissions(
      String[] permissions, int requestCode, PermissionListener listener) {
    mPermissionListener = listener;
    requestPermissions(permissions, requestCode);
  }

  /** Builder class to help instantiate a ReactFragment */
  public static class Builder {

    String mComponentName;
    Bundle mLaunchOptions;

    public Builder() {
      mComponentName = null;
      mLaunchOptions = null;
    }

    /**
     * Set the Component name for our React Native instance.
     *
     * @param componentName The name of the component
     * @return Builder
     */
    public Builder setComponentName(String componentName) {
      mComponentName = componentName;
      return this;
    }

    /**
     * Set the Launch Options for our React Native instance.
     *
     * @param launchOptions launchOptions
     * @return Builder
     */
    public Builder setLaunchOptions(Bundle launchOptions) {
      mLaunchOptions = launchOptions;
      return this;
    }

    public ReactFragment build() {
      return ReactFragment.newInstance(mComponentName, mLaunchOptions);
    }
  }
}