android/sample/src/debug/java/com/facebook/flipper/connectivitytest/ConnectionTestPlugin.java [40:61]:
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  @Override
  public void onConnect(FlipperConnection connection) {
    mConnection = connection;
    connection.receive(
        "displayMessage",
        new FlipperReceiver() {
          @Override
          public void onReceive(final FlipperObject params, FlipperResponder responder) {
            if (mActivity != null) {
              mActivity.runOnUiThread(
                  new Runnable() {
                    @Override
                    public void run() {
                      Toast.makeText(mActivity, params.getString("message"), Toast.LENGTH_SHORT)
                          .show();
                    }
                  });
            }

            responder.success(new FlipperObject.Builder().put("greeting", "Hello").build());
          }
        });
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android/sample/src/debug/java/com/facebook/flipper/plugins/example/ExampleFlipperPlugin.java [41:62]:
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  @Override
  public void onConnect(FlipperConnection connection) {
    mConnection = connection;
    connection.receive(
        "displayMessage",
        new FlipperReceiver() {
          @Override
          public void onReceive(final FlipperObject params, FlipperResponder responder) {
            if (mActivity != null) {
              mActivity.runOnUiThread(
                  new Runnable() {
                    @Override
                    public void run() {
                      Toast.makeText(mActivity, params.getString("message"), Toast.LENGTH_SHORT)
                          .show();
                    }
                  });
            }

            responder.success(new FlipperObject.Builder().put("greeting", "Hello").build());
          }
        });
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