Java ReactContext類代碼示例

import com.facebook.react.bridge.ReactContext; //導入依賴的package包/類
private static void waitForJSIdle(ReactContext reactContext) {
  if (!reactContext.hasActiveCatalystInstance()) {
    return;
  }
  final CountDownLatch latch = new CountDownLatch(1);

  reactContext.runOnJSQueueThread(
      new Runnable() {
        @Override
        public void run() {
          latch.countDown();
        }
      });

  try {
    if (!latch.await(5000, TimeUnit.MILLISECONDS)) {
      throw new RuntimeException("Timed out waiting for JS thread");
    }
  } catch (Exception e) {
    throw new RuntimeException(e);
  }
}
 

import com.facebook.react.bridge.ReactContext; //導入依賴的package包/類
/**
 * Start a JS task. Handles invoking {@link AppRegistry#startHeadlessTask} and notifying
 * listeners.
 *
 * @return a unique id representing this task instance.
 */
public synchronized int startTask(final HeadlessJsTaskConfig taskConfig) {
  UiThreadUtil.assertOnUiThread();
  ReactContext reactContext = Assertions.assertNotNull(
    mReactContext.get(),
    "Tried to start a task on a react context that has already been destroyed");
  if (reactContext.getLifecycleState() == LifecycleState.RESUMED &&
    !taskConfig.isAllowedInForeground()) {
    throw new IllegalStateException(
      "Tried to start task " + taskConfig.getTaskKey() +
        " while in foreground, but this is not allowed.");
  }
  final int taskId = mLastTaskId.incrementAndGet();
  mActiveTasks.add(taskId);
  reactContext.getJSModule(AppRegistry.class)
    .startHeadlessTask(taskId, taskConfig.getTaskKey(), taskConfig.getData());
  if (taskConfig.getTimeout() > 0) {
    scheduleTaskTimeout(taskId, taskConfig.getTimeout());
  }
  for (HeadlessJsTaskEventListener listener : mHeadlessJsTaskEventListeners) {
    listener.onHeadlessJsTaskStart(taskId);
  }
  return taskId;
}
 

import com.facebook.react.bridge.ReactContext; //導入依賴的package包/類
private static void emitScrollEvent(ViewGroup scrollView, ScrollEventType scrollEventType) {
  View contentView = scrollView.getChildAt(0);

  if (contentView == null) {
    return;
  }

  ReactContext reactContext = (ReactContext) scrollView.getContext();
  reactContext.getNativeModule(UIManagerModule.class).getEventDispatcher().dispatchEvent(
      ScrollEvent.obtain(
          scrollView.getId(),
          scrollEventType,
          scrollView.getScrollX(),
          scrollView.getScrollY(),
          contentView.getWidth(),
          contentView.getHeight(),
          scrollView.getWidth(),
          scrollView.getHeight()));
}
 

import com.facebook.react.bridge.ReactContext; //導入依賴的package包/類
SocketClient(ReadableMap params, ReactContext reactContext) {
    //String addr, int port, boolean autoReconnect
    mReactContext = reactContext;
    dstAddress = params.getString("address");
    dstPort = params.getInt("port");
    if (params.hasKey("reconnect")) {
        reconnectOnClose = params.getBoolean("reconnect");
    }
    if (params.hasKey("maxReconnectAttempts")) {
        maxReconnectAttempts = params.getInt("maxReconnectAttempts");
    }
    if (params.hasKey("reconnectDelay")) {
        reconnectDelay = params.getInt("reconnectDelay");
    }

    Thread socketClientThread = new Thread(new SocketClientThread());
    socketClientThread.start();
}
 

import com.facebook.react.bridge.ReactContext; //導入依賴的package包/類
private CropTask(
    ReactContext context,
    String uri,
    int x,
    int y,
    int width,
    int height,
    Callback success,
    Callback error) {
  super(context);
  if (x < 0 || y < 0 || width <= 0 || height <= 0) {
    throw new JSApplicationIllegalArgumentException(String.format(
        "Invalid crop rectangle: [%d, %d, %d, %d]", x, y, width, height));
  }
  mContext = context;
  mUri = uri;
  mX = x;
  mY = y;
  mWidth = width;
  mHeight = height;
  mSuccess = success;
  mError = error;
}
 

import com.facebook.react.bridge.ReactContext; //導入依賴的package包/類
void setup(ReactContext reactContext) {
  this.setOrientation(VERTICAL);
  this.reactViewPager = new ReactViewPager(reactContext);
  this.reactViewPager.setParentIdCallback(new ReactViewPager.ParentIdCallback() {
    @Override public int getParentId() {
      return getId();
    }
  });
  this.tabLayout = new TabLayout(reactContext);
  this.tabLayout.setTabMode(TabLayout.MODE_SCROLLABLE);
  LayoutParams viewPagerParams =
      new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT,
          1);

  LayoutParams tabParams =
      new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
  this.addView(tabLayout, tabParams);
  this.addView(reactViewPager, viewPagerParams);
  tabLayout.setupWithViewPager(reactViewPager);
}
 

import com.facebook.react.bridge.ReactContext; //導入依賴的package包/類
@ReactMethod
void callJavaScript() {
    Activity activity = getCurrentActivity();
    if (activity != null) {
        MainApplication application = (MainApplication) activity.getApplication();
        ReactNativeHost reactNativeHost = application.getReactNativeHost();
        ReactInstanceManager reactInstanceManager = reactNativeHost.getReactInstanceManager();
        ReactContext reactContext = reactInstanceManager.getCurrentReactContext();

        if (reactContext != null) {
            CatalystInstance catalystInstance = reactContext.getCatalystInstance();
            WritableNativeArray params = new WritableNativeArray();
            params.pushString("Hello, JavaScript!");
            catalystInstance.callFunction("JavaScriptVisibleToJava", "alert", params);
        }
    }
}
 

import com.facebook.react.bridge.ReactContext; //導入依賴的package包/類
@Override
public void onDestroy() {
  super.onDestroy();

  if (getReactNativeHost().hasInstance()) {
    ReactInstanceManager reactInstanceManager = getReactNativeHost().getReactInstanceManager();
    ReactContext reactContext = reactInstanceManager.getCurrentReactContext();
    if (reactContext != null) {
      HeadlessJsTaskContext headlessJsTaskContext =
        HeadlessJsTaskContext.getInstance(reactContext);
      headlessJsTaskContext.removeTaskEventListener(this);
    }
  }
  if (sWakeLock != null) {
    sWakeLock.release();
  }
}
 

import com.facebook.react.bridge.ReactContext; //導入依賴的package包/類
@Override
protected void onSizeChanged(final int w, final int h, int oldw, int oldh) {
  super.onSizeChanged(w, h, oldw, oldh);
  if (getChildCount() > 0) {
    final int viewTag = getChildAt(0).getId();
    ReactContext reactContext = (ReactContext) getContext();
    reactContext.runOnNativeModulesQueueThread(
      new GuardedRunnable(reactContext) {
        @Override
        public void runGuarded() {
          ((ReactContext) getContext()).getNativeModule(UIManagerModule.class)
            .updateNodeSize(viewTag, w, h);
        }
      });
  }
}
 

import com.facebook.react.bridge.ReactContext; //導入依賴的package包/類
/**
 * Get the default Fresco configuration builder.
 * Allows adding of configuration options in addition to the default values.
 *
 * @return {@link ImagePipelineConfig.Builder} that has been initialized with default values
 */
public static ImagePipelineConfig.Builder getDefaultConfigBuilder(ReactContext context) {
  HashSet<RequestListener> requestListeners = new HashSet<>();
  requestListeners.add(new SystraceRequestListener());

  OkHttpClient client = OkHttpClientProvider.createClient();

  // make sure to forward cookies for any requests via the okHttpClient
  // so that image requests to endpoints that use cookies still work
  CookieJarContainer container = (CookieJarContainer) client.cookieJar();
  ForwardingCookieHandler handler = new ForwardingCookieHandler(context);
  container.setCookieJar(new JavaNetCookieJar(handler));

  return OkHttpImagePipelineConfigFactory
    .newBuilder(context.getApplicationContext(), client)
    .setNetworkFetcher(new ReactOkHttpNetworkFetcher(client))
    .setDownsampleEnabled(false)
    .setRequestListeners(requestListeners);
}
 

import com.facebook.react.bridge.ReactContext; //導入依賴的package包/類
public void shutDownContext() {
  if (mInstance != null) {
    final ReactContext contextToDestroy = mReactContext;
    mReactContext = null;
    mInstance = null;

    final SimpleSettableFuture<Void> semaphore = new SimpleSettableFuture<>();
    UiThreadUtil.runOnUiThread(new Runnable() {
      @Override
      public void run() {
        if (contextToDestroy != null) {
          contextToDestroy.destroy();
        }
        semaphore.set(null);
      }
    });
    semaphore.getOrThrow();
  }
}
 

import com.facebook.react.bridge.ReactContext; //導入依賴的package包/類
/**
 * Waits for both the UI thread and bridge to be idle. It determines this by waiting for the
 * bridge to become idle, then waiting for the UI thread to become idle, then checking if the
 * bridge is idle again (if the bridge was idle before and is still idle after running the UI
 * thread to idle, then there are no more events to process in either place).
 * <p/>
 * Also waits for any Choreographer callbacks to run after the initial sync since things like UI
 * events are initiated from Choreographer callbacks.
 */
public static void waitForBridgeAndUIIdle(
    ReactBridgeIdleSignaler idleSignaler,
    final ReactContext reactContext,
    long timeoutMs) {
  UiThreadUtil.assertNotOnUiThread();

  long startTime = SystemClock.uptimeMillis();
  waitInner(idleSignaler, timeoutMs);

  long timeToWait = Math.max(1, timeoutMs - (SystemClock.uptimeMillis() - startTime));
  waitForChoreographer(timeToWait);
  waitForJSIdle(reactContext);

  timeToWait = Math.max(1, timeoutMs - (SystemClock.uptimeMillis() - startTime));
  waitInner(idleSignaler, timeToWait);
  timeToWait = Math.max(1, timeoutMs - (SystemClock.uptimeMillis() - startTime));
  waitForChoreographer(timeToWait);
}
 

import com.facebook.react.bridge.ReactContext; //導入依賴的package包/類
private void handleSuccess() {
  WritableMap evt = Arguments.createMap();

  ReactContext ctx = (ReactContext) getContext();
  ctx.getJSModule(RCTEventEmitter.class).receiveEvent(
          getId(),
          "onLoadSuccess",
          evt);
}
 

import com.facebook.react.bridge.ReactContext; //導入依賴的package包/類
@Override
public void onSizeChanged(TweetView view, final int width, final int height) {
  Log.d(TAG, "TweetView changed size: " + width + ", " + height);
  ReactContext ctx = (ReactContext) view.getContext();
  final UIManagerModule uiManager = ctx.getNativeModule(UIManagerModule.class);
  final int reactTag = view.getReactTag();

  ctx.runOnNativeModulesQueueThread(new Runnable() {
    @Override
    public void run() {
      uiManager.updateNodeSize(reactTag, width, height);
    }
  });
}
 

import com.facebook.react.bridge.ReactContext; //導入依賴的package包/類
@Override
public void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset) {
    WritableMap event = Arguments.createMap();
    event.putDouble("offset", verticalOffset);
    ReactContext reactContext = (ReactContext) appBarLayout.getContext();
    reactContext.getJSModule(RCTEventEmitter.class).receiveEvent(appBarLayout.getId(), "topOffsetChanged", event);
}